日本エンヂニヤ List of Products and Services

The "WSS Water Screen" is a surface water intake device designed for water supply facilities. Our unique backwater intake method and special screen structure suppress the intrusion of leaves and sediment during water intake, and the screen surface is cleaned by washing it with excess water. This allows for stable water intake while preventing clogging. Traditionally, cleaning and emergency responses due to clogging at the intake point were frequent during rainy seasons or when there were many fallen leaves, but the introduction of the WSS has significantly reduced the number of cleaning operations, easing the maintenance burden on-site. The product accommodates daily volumes from 25 m³ to 5000 m³. The WSS for 25 m³ is compact and lightweight, making it suitable for existing weirs and limited installation spaces. Using optional U-shaped gutters can reduce construction costs. The WSS for 5000 m³ is a large-capacity model, making it suitable for use in water supply systems. Currently, it has been introduced in over 1,300 water supply facilities nationwide and is adopted by many municipalities as a reliable and proven product.

• Water supply facilities

In small-scale water supply facilities such as drinking water supply systems, there may be cases where a sedimentation basin cannot be secured after extracting surface water from rivers and other sources. Large amounts of sediment flow into the filtration facilities, leading to filter clogging and causing equipment failures, which increases the maintenance burden, such as the costs for sludge removal from sedimentation and filtration basins and equipment repairs. ■ Inability to secure a sedimentation basin ■ Large amounts of sediment flow into filtration facilities These issues can be resolved by the portable small sedimentation tank "GCP-AK-25M," which can be transported manually! The small sedimentation tank has four features: 1. Portable and can be transported manually 2. Made of polycarbonate, weighing approximately 16.3 kg, making it lightweight 3. A low surface load rate of 163 mm/min, capable of removing sand particles larger than 0.05 mm 4. Significantly reduces filter clogging and cleaning work for sedimentation basins.

• Water Treatment

We would like to introduce a case where the dust removal device "JJS-C type" was installed in the head tank of the Gorohebi Water Supply Hydroelectric Power Plant in Nagano Prefecture. This product was jointly developed with Shinshu University, Fujimaki Construction Co., Ltd., and JSE Co., Ltd., with a maximum water usage of 350L/second and a maximum effective drop of 43.08m. Power generation began in April 2023, and part of the revenue from selling electricity will be used for community coexistence and water management. 【Case Overview】 ■ Maximum water usage: 350L/second ■ Maximum effective drop: 43.08m ■ Maximum output: 105kW *For more details, please refer to the PDF document or feel free to contact us.

• Water Treatment

We would like to introduce a case where the dust removal device "JJS-C type" was installed in the head tank of the Sasagawa Power Plant in Asahi Town, Toyama Prefecture. This product was jointly developed with Shinshu University, Fujimaki Construction Co., Ltd., and JSE Co., Ltd. The revenue from electricity sales will be utilized for the renewal and maintenance of water supply facilities. The maximum output is approximately 199 kW, and the maximum effective head is about 105 m. Please feel free to contact us if you have any inquiries. 【Case Overview】 ■ Maximum water usage: 280 L/second ■ Maximum effective head: approximately 105 m ■ Maximum output: approximately 199 kW *For more details, please refer to the PDF materials or feel free to contact us.

• Water Treatment

We would like to introduce a case where a dust removal device, model 'JJS-C', was installed at the head tank of the Miori Power Plant No. 2 in Nishi-Awakura Village, Okayama Prefecture. Water flow began in June 2021, and power generation started, achieving an equipment utilization rate of over 80%. The revenue from electricity sales is being utilized for forestry promotion. The maximum water usage is 400L/second, and this product was jointly developed with Shinshu University, Fujimaki Construction Co., Ltd., and JSE Co., Ltd. 【Case Overview】 ■ Maximum water usage: 400L/second ■ Maximum effective head: 66.43m ■ Maximum output: approximately 199kW *For more details, please refer to the PDF document or feel free to contact us.

• Water Treatment

We would like to introduce a case where the dust removal device "JJS-C type" was installed at the head tank of the Suzaka City Yuseiryo Power Plant. Power generation began in November 2020, and during power outages caused by disasters, electricity is supplied to the Suzaka Yuseiryo, a facility supporting people with disabilities. This product was jointly developed with Shinshu University, Fujimaki Construction Co., Ltd., and JSE Co., Ltd. Please feel free to contact us if you have any inquiries. 【Case Overview】 ■ Maximum water usage: 120L/second ■ Maximum effective drop: 26.4m ■ Maximum output: approximately 18.6kW *For more details, please refer to the PDF document or feel free to contact us.

• Water Treatment

We would like to introduce a case where a dust removal device, model 'JJS-C', was installed at the head tank of the Nozawa Water Power Plant in Suzaka City. This product was jointly developed with Shinshu University, Fujimaki Construction Co., Ltd., and JSE Co., Ltd. It began water flow testing in May 2018 and started power generation in November 2019. It has reduced the cleaning burden of agricultural water and achieved an annual CO2 emission reduction of approximately 280 tons. 【Case Overview】 ■ Maximum water usage: 430 L/second ■ Maximum effective drop: 36.54 m ■ Maximum output: approximately 115 kW *For more details, please refer to the PDF document or feel free to contact us.

• Water Treatment

We would like to introduce a case where the dust removal device "JJS-B type" was installed in an irrigation canal in a certain location in Hiroshima Prefecture. It was installed in May 2023 for the purpose of agricultural water use. The maximum usage water volume is 5L/second, and it will be utilized for smart agriculture. Please feel free to contact us if you have any inquiries. 【Case Overview】 ■ Maximum usage water volume: 5L/second ■ Purpose of use: Agricultural water *For more details, please refer to the PDF document or feel free to contact us.

• Water Treatment

We would like to introduce a case where the dust removal device "JJS-B type" was implemented in the open water channel of Sakae Village, Nagano Prefecture. Water flow and power generation began in July 2014, providing an uninterrupted power supply through autonomous operation. It supplies power for security lights, public restroom lighting, and emergency power during disasters, thereby improving local disaster prevention measures and public safety. Additionally, this product was jointly developed with the National Agriculture and Food Research Organization and Shinshu University. Please feel free to contact us if you have any inquiries. 【Case Overview】 ■ Maximum water usage: 30L/second ■ Maximum effective drop: 11.5m ■ Maximum output: 1.5kW *For more details, please refer to the PDF materials or feel free to contact us.

• Water Treatment

We would like to introduce an application case using the dust removal device 'JJS-B type' at two open water channels in Takashima City, Shiga Prefecture. This product was jointly developed with the National Agriculture and Food Research Organization and Shinshu University, and it began operation in December 2021. It is installed in a snow melting pump tank during winter, diverting agricultural water. It prevents clogging of the sprinkling nozzles on the road surface. 【Case Overview】 ■ Maximum water usage: 100L/second ■ Effects - Reduces the cleaning burden of sprinkling nozzles - Prevents slipping accidents during snowfall *For more details, please refer to the PDF document or feel free to contact us.

• Water Treatment

We would like to introduce a case where the dust removal device "JJS-A type" was implemented at a certain golf course in Nara Prefecture. Water flow started in April 2019 for the purpose of sprinkler irrigation. The maximum water usage is 50L/second. We have achieved prevention of clogging in the irrigation nozzles. Please feel free to contact us if you have any inquiries. 【Case Overview】 ■ Maximum water usage: 50L/second ■ Purpose: Sprinkler irrigation *For more details, please refer to the PDF document or feel free to contact us.

• Water Treatment

We would like to introduce a case where a dust removal device "JJS-A type" was installed at the water intake dam in Gujo City, Gifu Prefecture. The water started flowing for agricultural use in February 2017, achieving stable water intake. The maximum usage water volume is 10L/second. Please feel free to contact us if you have any inquiries. 【Case Overview】 ■ Maximum usage water volume: 10L/second ■ Purpose of use: Agricultural water *For more details, please refer to the PDF document or feel free to contact us.

• Water Treatment

We would like to introduce a case where the dust removal device "JJS-A type" was introduced to the drop structure in the Adaki area of Gujo City. Water flow began in November 2013, and power generation started, supplying energy to greenhouses through autonomous operation. It is used as a power source for lighting and ventilation systems. The quality of shiitake mushrooms has improved, and the harvest yield has increased. Please feel free to contact us if you have any inquiries. 【Case Overview】 ■ Maximum water usage: 17L/second ■ Maximum effective drop: 8.3m ■ Maximum output: approximately 1kW *For more details, please refer to the PDF document or feel free to contact us.

• Water Treatment

We would like to introduce a case where a dust removal device "JJS-A type" was installed at the water intake weir in Todakyo Park, Numazu City, Shizuoka Prefecture. The maximum water usage is 62L/second, and the maximum effective head is 61.7m. The dust removal device began operation in March 2020, and power generation started in April 2021. The equipment utilization rate is over 95%. Please feel free to contact us if you have any inquiries. 【Case Overview】 ■ Maximum water usage: 62L/second ■ Maximum effective head: 61.7m ■ Maximum output: 19.9kW *For more details, please refer to the PDF document or feel free to contact us.

• Water Treatment

This document is a collection of case studies for the "JJS Series Non-Powered and Non-Electric Dust Removal Device." It includes examples such as the installation of a water intake weir at Todakyo Park in Numazu City, Shizuoka Prefecture, the installation of a drop structure in the Ataki area of Gujo City, and the installation of an open channel in Sakae Village, Nagano Prefecture. We also introduce potential installation locations for the dust removal devices and the features of the series. Please feel free to download and take a look. [Contents (partial)] ■ Introduction of JJS-A model case studies - Todakyo Park, Numazu City, Shizuoka Prefecture (water intake weir installation example) - Ataki area, Gujo City (drop structure installation example) - Gujo City, Gifu Prefecture (water intake weir installation example) - A certain golf course in Nara Prefecture (drop structure installation example) *For more details, please refer to the PDF document or feel free to contact us.

• Water Treatment Plant

【Features】 ■ Submersible emergency shut-off valve installed inside the water distribution tank ■ Installation possible through diving work in water distribution tanks where water cannot be cut off ■ No valve chamber required, reducing civil engineering work and shortening construction time ■ Made of rust-resistant stainless steel ■ Powered by an electric double-layer capacitor We also handle pipeline types. *For more details, please refer to the PDF materials or feel free to contact us.

• Water and sewerage pipe fittings

"Dust removal" is needed in various places such as air, water resources, and manufacturing lines. Our company specializes in the field of water resources. In recent years, the use of small hydropower generation facilities has gained attention from the perspective of energy and environmental issues. However, it is also true that existing water intake devices face problems and challenges, such as reduced intake capacity due to clogging from large amounts of fallen leaves and sediment. The non-powered, non-electric dust removal device "JJS" that we handle supports stable operation of small hydropower generation and stable supply of agricultural water through reliable "dust removal" in surface water intake. 【Benefits of Introducing JJS】 ■ Maintenance only requires cleaning the screen surface a few times a year with a deck brush or similar tool. ■ Clogging from fallen leaves and sediment is very minimal, supporting a high operating rate of generators due to stable intake volume. ■ Easy installation on existing weirs, effectively utilizing existing equipment. *For more details, please refer to the PDF materials or feel free to contact us.

• Water Treatment

The "JJS-A" is a product that can be installed on river dams. By installing it in rivers, it simplifies the equipment up to the head tank. Small hydropower generation is determined by the removal of debris, and it is a strong ally for small hydropower generation and agricultural water intake. Additionally, since there are no moving parts, the likelihood of failure is extremely low, and debris flows downstream in the river, eliminating the need for debris disposal. 【Features】 ■ Reduces initial costs ■ No power or electricity required at the intake ■ Reduces maintenance costs ■ Decreases the frequency of cleaning the intake *For more details, please refer to the PDF materials or feel free to contact us.

• Hydroelectric power

The "JJS-A" is a product that can be easily installed in waterways to remove debris such as fallen leaves and driftwood. Its special structure, designed to minimize clogging and consider maintenance, achieves both stable water intake and easy upkeep. 【Features】 ■ Stable power generation and ample agricultural water supply ■ Special structure that minimizes clogging ■ Easy maintenance ■ Reduced installation and operational costs *For more details, please refer to the PDF document or feel free to contact us.

• Hydroelectric power

The "JJS-B" is a non-powered, non-electric debris removal system that removes leaves and driftwood from waterways, ensuring a stable water intake volume while achieving low installation and operational costs. Thanks to its special structure that minimizes clogging and considers maintenance, it achieves both stable water intake and easy upkeep. It can be installed more easily compared to conventional debris removal devices, thereby reducing the overall introduction and operational costs of the facility. 【Features】 ■ Special structure that minimizes clogging ■ Easy maintenance ■ Reduced installation and operational costs *For more details, please refer to the PDF document or feel free to contact us.

• Hydroelectric power

The "JJS-C" is a non-powered, non-electric debris removal system with a high capacity for removing waste such as fallen leaves and driftwood, which increases power output through full water intake and improves the operating rate of the water turbine. By simplifying the structure, initial costs are reduced. Backflow occurs due to the closing operation of the water turbine's guide vanes and valves, contributing to a reduction in maintenance burden by washing away debris. 【Features】 ■ Reduced initial costs ■ Increased efficiency by combining screens at two angles ■ Reduced maintenance burden *For more details, please refer to the PDF materials or feel free to contact us.

• Other power generation

The "JJS Series" is a debris removal device that eliminates trash such as fallen leaves and driftwood from waterways, ensuring a stable water intake and stable power generation. The "JJS-A" model has been adopted for the small hydropower generation facility in the Ataki (Itakura area), achieving stable water intake and low-cost installation and operation. In addition, the series demonstrates its performance in various locations, including demonstration model projects for water turbines at hydropower plants and a certain golf course in Nara Prefecture. 【Implementation Results】 ■ Small hydropower generation facility in Ataki (Itakura area) (JJS-A) ■ FY 2017 Yonago Kitano-sawa Water Supply Hydropower Plant Water Turbine Demonstration Model Project (JJS-C) ■ Sakae Village, Nagano Prefecture (JJS-B) ■ A certain golf course in Nara Prefecture (JJS-A-50LA) ■ Gujo City, Gifu Prefecture (JJS-A-10LA) *For more details, please refer to the PDF materials or feel free to contact us.

• Water Treatment

The "WSS Water Screen" is a water intake screen that can be installed by improving existing intake weirs. Thanks to its unique structure and special screen developed in-house, it continuously washes away fallen leaves and sediment mixed in river water while taking in water, making it less prone to clogging and ensuring a stable water intake volume. Compared to conventional water intake methods, it frees you from frequent cleaning of the intake, significantly reducing the burden of maintenance and management of water intake facilities. 【Features】 ■ Less prone to clogging ■ Easy maintenance ■ Small installation space ■ Easy installation on existing weirs ■ Reduced construction costs *For more details, please refer to the PDF document or feel free to contact us.

• Water Treatment

The "WSS Water Screen" is a product that allows for surface water intake. It adopts a rear water intake method using our unique technology of a special screen. In addition to its structure that is resistant to clogging, maintenance can be performed with simple tasks, significantly reducing the burden of managing and maintaining the water source. The compact design of the main unit makes it easy to install on existing weirs, allowing for effective utilization of the equipment. 【Features】 ■ Resistant to clogging ■ Easy maintenance ■ Small installation space ■ Easy installation on existing weirs ■ Low construction costs *For more details, please refer to the PDF document or feel free to contact us.

• Water supply facilities

The "WSS-B-25M" is a product designed for small-scale water supply facilities that can draw drinking water. By washing the screen surface while drawing water, it is less likely to become clogged with leaves and sediment, thereby reducing maintenance burdens. When using the optional U-shaped ditch, it is possible to reduce construction costs. 【Features】 ■ No need for frequent cleaning of the intake ■ Contributes to reducing maintenance burdens ■ Draws water while washing the screen surface ■ Less likely to become clogged with leaves and sediment ■ Cost reduction in construction (when using the optional U-shaped ditch) ■ Ultra-compact and can be installed in a space-saving manner *For more details, please refer to the PDF document or feel free to contact us.

• Other civil engineering works

Our company handles "small sedimentation tanks." By designing the water flow within the tank to be upward-flowing, we have achieved a reduction in installation area and miniaturization compared to horizontal-flow types. The main body is made of resin (polycarbonate), which reduces weight (14.2 kg), allowing for transportation and delivery to the site by manual labor. Additionally, we have kept the surface load rate to 163 mm/min, enabling the removal of sand particles larger than 0.1 mm. 【Features】 ■ Compact and lightweight, portable design ■ Can be installed in areas inaccessible to heavy machinery ■ Cost-effective construction with simple installation ■ High sedimentation separation capability reduces sand inflow, easing the maintenance burden of water treatment facilities *For more details, please refer to the PDF document or feel free to contact us.

• Water Treatment

The "GCP-AK-25M" is a product that can be used in combination with a super compact WSS water screen, which reduces the load on filtration facilities with its advanced sedimentation separation capability. The sedimentation particle size due to the inclined plate is 0.05mm or larger. Due to its compact and lightweight design, it can be easily transported and installed manually. 【Features】 ■ Can be installed in a space-saving manner due to its small size ■ Lightweight, allowing for manual transportation and installation ■ Easy maintenance ■ Reduces the load on filtration facilities with high sedimentation separation capability ■ Sedimentation particle size of 0.05mm or larger ■ No need for extensive civil engineering work for installation *For more details, please refer to the PDF document or feel free to contact us.

• Water treatment technology and systems

The "NCS Series" is an underwater emergency water shut-off system that adopts a design with a shut-off valve installed inside the water distribution reservoir. By installing the shut-off valve inside the reservoir, it is possible to securely retain the water in the reservoir during disasters such as major earthquakes that may cause pipeline damage and leakage. Additionally, by ensuring a certain amount of water, it allows for the early initiation of water supply activities after pipeline restoration. 【Features】 ■ Adopts an underwater design with a shut-off valve installed inside the water distribution reservoir ■ No need for a valve chamber ■ Reduces piping work ■ Space-saving as no pit is required ■ Easy installation with a short construction period ■ Versatile operation control *For more details, please refer to the PDF document or feel free to contact us.

• Water Treatment

The "NCB series" is a pipeline-type emergency shut-off valve that allows for arbitrary setting of intermediate valve opening degrees with versatile operation control. By adopting electric double-layer capacitors, it can be reliably operated even during power outages. Unlike conventional batteries, it can be charged in a few seconds, and even when fully charged, it experiences minimal degradation and has a long lifespan. Additionally, we also offer the underwater emergency water shut-off system "NCS series," which can be installed inside a water reservoir. 【Features】 <NCB series> ■ Equipped with failure prevention protection and self-diagnosis functions ■ Memory function that records operational information retains data even when power is cut ■ Communication function allows management of operational history via PC ■ Various control systems can be constructed through combinations of sensors ■ Verified operation in cold regions (-10°C) (when the backup power supply is a DC power source) *For more details, please refer to the PDF materials or feel free to contact us.

• Water treatment technology and systems

We would like to introduce the "Instrumentation and Control Equipment" that we handle. In plants such as water supply facilities, we provide sensors that act as the eyes and ears in place of humans, and loop devices that convert and transmit signals from the sensors like nerves. Furthermore, we handle various instrumentation devices, including control devices that process and summarize that information, and power supply devices that supply power to each unit. Of course, we not only sell but also carry out installation and adjustments. Please feel free to consult us. 【Products We Handle (Excerpt)】 ■ Sensors - Flow meters (electromagnetic flow meters, Woltman-type flow meters, etc.) - Level gauges (submersible level gauges, capacitive level gauges, ultrasonic level gauges, etc.) - Pressure gauges - Thermometers ■ Loop devices, control devices, panels - Isolators, signal converters - Indicators (wide-angle indicators, pargraph indicators) - Setting devices *For more details, please refer to the PDF document or feel free to contact us.

• Monitoring and Control Equipment

Until now, we had been using riverbed-embedded porous pipes for water intake, and the intake volume had gradually decreased due to clogging and sediment accumulation. As a result, it was necessary to perform backwashing every 3 to 4 days during good weather and each time during rainfall, which placed a significant burden on the maintenance of the water source. By adopting the "WSS Water Screen," clogging has been eliminated, and the need for backwashing has been removed, allowing us to stably secure sufficient intake volume. In Toyota City, there are more than 20 installations throughout the city, contributing to stable water intake. [Overview] ■ Location: Toyota City, Aichi Prefecture ■ Installation Period: Fiscal Year 2008 ■ Construction Overview: WSS-6 type × 2 units *For more details, please refer to the PDF document or feel free to contact us.

• Water Treatment

Normally a clear stream, but when it floods, there is a significant amount of sediment flow. In this river, the water intake using the existing catchment basin frequently became blocked, requiring regular removal of fallen leaves and sediment. To reach the water source, one had to climb a rocky, fast-flowing area, which posed dangers and became a significant burden for the elderly managing it. Therefore, a water screen "WSS-B-25M" was installed. The frequency of fallen leaf removal and sediment cleaning at the water source has been greatly reduced, and even during heavy rains, it can maintain a stable and sufficient water intake without blockage. 【Overview】 ■ Location: Nishimera Village, Koyu District, Miyazaki Prefecture ■ Installation Period: Fiscal Year 2018 ■ Construction Overview: WSS-B-25M x 1 unit *For more details, please refer to the PDF document or feel free to contact us.

• Water Treatment

Normally, it is a calm river with clear water flowing, but when landslides occur due to typhoons or heavy rainfall, the intake can be destroyed and buried with sediment. This has happened many times. Therefore, a secondary waterway was established at the intake dam to return river water to the main stream. A concrete protective wall was installed at the inflow section of the secondary waterway to protect the "WSS Water Screen" from direct impact by rocks. With the introduction of this product, the inflow of sediment has decreased, allowing for stable water intake, which has significantly reduced the burden of daily water source management. 【Overview】 ■Location: Tarumizu City, Kagoshima Prefecture ■Implementation Period: Fiscal Year 2008 ■Construction Overview: 3 units of WSS-6 type *For more details, please refer to the PDF document or feel free to contact us.

• Water Treatment

In Nakatsugawa City, there was no space around the Okute water reservoir in the Ochiai area of the water supply system, and acquiring nearby land was also difficult, which led to a deadlock in the installation of emergency shut-off valves. Therefore, an underwater emergency shut-off valve "NCS-A-150" was installed in one of the two water reservoirs on the outflow pipe inside the reservoir. By installing the valve controller at the top of the reservoir, we were able to clear the issue of installation space without acquiring land. As a result, we were able to eliminate the risk of drinking water loss due to pipeline damage caused by disasters such as earthquakes. 【Overview】 ■ Location: Nakatsugawa City, Gifu Prefecture ■ Implementation Period: Fiscal Year 2017 ■ Construction Summary - Installation of underwater emergency shut-off valve NCS-A-150 in a two-tank reinforced concrete water reservoir with a capacity of 300m3 in Nakatsugawa City water supply system. *For more details, please refer to the PDF document or feel free to contact us.

• Water Treatment

In a river with a very high flow of fine sand, frequent cleaning of the sedimentation basin was necessary due to the previous method of water extraction. Additionally, leaves stuck to the wire mesh covering the intake, causing clogging and a decrease in water extraction volume. As a result, we were going to the water source almost daily to perform mud removal and clean the wire mesh. Furthermore, during winter, with snow accumulation exceeding 2 meters, snow removal was required to approach the water source, which became a significant burden. Therefore, we installed our "Water Screen." The amount of sand flowing into the sedimentation basin has decreased, significantly reducing the frequency of cleaning. In particular, the reduction in the number of cleaning operations during winter has greatly alleviated the burden of maintenance. [Overview] ■ Location: Somewhere in Hokkaido ■ Installation Period: Fiscal Year 2016 ■ Construction Overview: 3 units of WSS-5 type *For more details, please refer to the PDF document or feel free to contact us.

• Water Treatment

In the rapid filtration facility, there were significant fluctuations in the raw water turbidity during rainy and sunny weather, and the amount of coagulant injected was adjusted based on the experience and intuition of the personnel in charge. Therefore, a control panel was equipped with a regulator to implement control of the coagulant injection amount. By combining the conventional intake flow rate with the raw water turbidity and based on the results of repeated jar tests, an appropriate injection amount corresponding to the raw water turbidity was determined, stabilizing floc formation. There is no longer any concern about changes in weather or fluctuations in raw water turbidity, and the concerns about aluminum detection have also been resolved, resulting in stable filtered water quality. [Overview] ■ Location: Somewhere in Nagano Prefecture ■ Implementation period: Fiscal Year 2011 ■ Construction summary - Modification of the control panel related to the signal acquisition of the raw water turbidity meter and intake flow meter *For more details, please refer to the PDF document or feel free to contact us.

• Water Treatment

In the rapid filtration facility, there were significant fluctuations in the turbidity of the raw water taken from the river, causing concerns about weather and raw water quality. The amount of coagulant injected was adjusted based on the experience and intuition of the personnel in charge. To address this, we installed a "raw water turbidity meter" and a "water intake flow meter," and equipped the control panel with a touch panel and PLC to control the amount of coagulant injected. By determining the appropriate injection amount based on the raw water turbidity, the formation of flocs became stable. We no longer had to worry about changes in weather or fluctuations in raw water turbidity, and concerns about aluminum detection were also alleviated. [Overview] ■ Location: Somewhere in Nagano Prefecture ■ Implementation Period: Fiscal Year 2009 ■ Construction Summary - Modification of the control panel related to the signal acquisition of the raw water turbidity meter and water intake flow meter *For more details, please refer to the PDF document or feel free to contact us.

• Water Treatment

In the event of a sudden trouble with water supply facilities, even if we request assistance from a major plant manufacturer, it can take several days to weeks for them to respond, leading to water outages. In rural areas, there are very few contractors who are well-versed in a wide range of technologies, which often results in delays in addressing issues with water supply facilities. Please consult with Japan Engineering. Our company has established a system where engineers with expertise in a wide range of technologies, including electrical, instrumentation, control, machinery, and information communication, can respond to emergencies, allowing us to handle sudden troubles. [Issues] ■ It takes several days to weeks even when requesting assistance from a major plant manufacturer. *For more details, please refer to the PDF document or feel free to contact us.

• Water Treatment

The environment surrounding water supply facilities is changing rapidly. Challenges such as the deterioration of raw water quality due to changes in water source environments, changes in water demand associated with population decline and shifts in industrial structure, and an increase in troubles due to the aging of water supply facilities are piling up. Addressing these challenges requires a wide range of knowledge and experience. Nihon Engineering is involved not only in the construction of water supply facilities but also in planning, design work, and maintenance management, including regular inspections and repair work, thus comprehensively engaging with water supply facilities. Utilizing the experience and know-how accumulated over more than 40 years since our founding, we provide planning proposals that address various challenges faced by water supply facilities. *For more details, please refer to the PDF materials or feel free to contact us.*

• Water Treatment

When taking water from rivers, it is necessary to implement measures to prevent debris such as gravel and fallen leaves from flowing in along with the water. Cleaning is challenging, especially in locations where the water source is deep in the mountains and difficult to access by vehicle. In particular, during late autumn when fallen leaves increase, the frequency of cleaning doubles, further increasing the maintenance burden. Our surface water intake device, the "WSS Water Screen," addresses these issues. By installing it on existing weirs, the frequency of cleaning at the intake point decreases even during the leaf-fall season, significantly reducing the maintenance burden. [Challenges] - Instability in water intake due to blockage at the water source intake - Difficulty in cleaning when taking water from rivers - Increased cleaning frequency in late autumn due to fallen leaves, leading to a greater maintenance burden *For more details, please refer to the PDF document or feel free to contact us.

• Water Treatment

In the case of a single-chamber distribution reservoir, if you try to install an emergency shut-off valve outside the reservoir, it will need to be placed on the main distribution pipe. If you want to carry out continuous water work to avoid water outages, space will be required to install a bypass pipeline, and if space cannot be secured, the emergency shut-off valve cannot be installed. Therefore, if the valve of the emergency shut-off valve is installed on the outflow pipe inside the distribution reservoir, construction work can be carried out through diving operations. Since work underwater will only involve flange connection work, installation can be carried out without shutting off the water. [Issues] - There are cases where a bypass pipeline cannot be installed, resulting in an inability to shut off the water. - If space cannot be secured, the emergency shut-off valve cannot be installed. - Even if space is secured, new construction costs will arise. *For more details, please refer to the PDF document or feel free to contact us.

• Water Treatment

To install an emergency shut-off valve, it is necessary to create a bypass pipeline outside the water distribution reservoir and build a pit for the installation. In some locations, it may not be possible to secure that space, forcing the abandonment of the installation of the emergency shut-off valve. As a result, the risk of drinking water leakage due to damage to the main water distribution pipe caused by earthquakes and other disasters remains unresolved. Therefore, by installing the valve of the emergency shut-off valve in the outflow pipe inside the water distribution reservoir and connecting a valve rod that rises from the valve to the drive unit installed at the top of the reservoir, we can secure the installation space. There will be no need to secure new installation space outside the water distribution reservoir. [Issue] ■ In some locations, there may be cases where the installation of the emergency shut-off valve is abandoned. *For more details, please refer to the PDF document or feel free to contact us.

• Water Treatment

In small-scale water supply facilities such as drinking water supply systems, there may be cases where sedimentation basins cannot be secured after taking water from surface water sources like rivers. Large amounts of sediment flow into the filtration facilities, leading to filter clogging and causing equipment failures, which increases maintenance burdens such as sludge removal work in sedimentation and filtration basins, as well as repair costs for the equipment. To address these issues, our company has developed and started selling a portable small sedimentation tank, "GCP-AK-25M," which can be manually transported. It is installed downstream of the water intake facility to suppress the inflow of sand into the filtration area. With a surface loading rate of 163 mm/min, it can effectively remove sand particles larger than 0.1 mm, thereby reducing the inflow of sediment into the filtration facilities. [Issues] ■ Sedimentation basins cannot be secured ■ Large amounts of sediment flow into filtration facilities *For more details, please refer to the PDF document or feel free to contact us.

• Water Treatment

In rural mountain settlements, water supply facilities often source water from deep mountain streams, typically extracting it from narrow valleys with steep slopes. Due to these geographical conditions, it is difficult for heavy machinery to access the area, making it impossible to construct concrete intake dams, and water is extracted using methods that are vulnerable to flooding and shifting stones. Our surface water intake device, the "Compact WSS Water Screen," is designed to be compact, allowing it to be securely fixed to existing dams with anchor bolts using a dedicated mounting frame, eliminating the need for civil engineering work with heavy machinery. Additionally, weighing approximately 6 kg, it can be manually transported, and it is also possible to install the intake device directly in the stream using lightweight resin U-shaped gutters. [Challenges] ■ In some locations, it is not possible to construct concrete intake dams. *For more details, please refer to the PDF document or feel free to contact us.

• Water Treatment