Our Worldwide Experiences

This project involved providing a sewage treatment solution for a transitional housing development located in Kam Tin, Yuen Long, Hong Kong. A packaged sewage treatment plant (STP) was designed to treat an average sewage flow of 533 cubic meters per day from the residential and amenity buildings.

The STP incorporated a multi-stage treatment process including screening, chemically enhanced primary treatment using WetSep filtration, biological treatment using anoxic and aerobic tanks, ceramic membrane filtration, UV disinfection, and sludge dewatering using a filter press. Key equipment included WetSep units, aeration tanks equipped with air blowers and mixers, ceramic membrane filtration tanks, UV disinfection units, and a containerized filter press.

The automated plant is capable of operating in both auto and manual modes. It was designed to achieve stringent effluent discharge standards and includes features such as odor control using a deodorization system, a real-time monitoring system, and emergency storage. The compact modular design and containerized equipment components allow for easy installation and operation/maintenance of the plant.

Balfour Beatty VINCI has used Waste & Environmental Technologies Ltd. to design and supply three package water treatment plants to treat water arising from construction activities for Phase One of the HS2 high speed rail project in the UK. Each plant will be able to treat a maximum of 60 cubic meters of water per hour.

The plants will utilize a multi-stage treatment process including a run-down screen for solids removal, a balance tank for flow equalization, a WetSep filtration system for chemical coagulation, flocculation and sedimentation, a carbon dioxide neutralization system for pH adjustment, and a containerized filter press for sludge dewatering. Key water treatment equipment include the WetSep units, carbon dioxide dosing system, filter press with integrated conveyor, and control system housed in a control cabin.

The compact modular design allows for easy on-site installation. The plants are designed to produce treated effluent meeting stringent discharge limits of less than 50 mg/L total suspended solids and pH between 6-9. They will be supplied with commissioning and operator training services.

Waste & Environmental Technologies carried out a boiler and heat recovery steam generator washing wastewater treatment project at Castle Peak Power Station. The project involved designing and installing a fully packaged 20m3/hr mobile wastewater treatment plant onsite to treat wastewater generated during boiler overhauls. The plant utilized our patented WetSep filtration system employing chemically enhanced primary treatment to remove over 95% of suspended solids and heavy metals from the wastewater. Further treatment through activated carbon filtration reduced residual contaminants to meet stringent discharge standards. 

The fully automated plant was operable by plant staff with onsite training. The compact, skid-mounted design allowed for easy mobilization and ensured continued treatment during outages. After treatment, the recycled water was stored onsite for reuse, achieving sustainable water management.

 A 120 m3/hr mobile wastewater treatment plant was installed to treat large volumes of trade effluent from onshore tunneling works. Effluent was generated from tunnel boring machine operations and sprayed concrete lining application. Two WetSep units employing chemically enhanced primary treatment efficiently handled the volumes. CO2 replacement of hazardous H2SO4 was implemented for safe pH adjustment. The fully automated plant was designed for easy operation by on-site staff. An integrated filter press and drag-link conveyor system dewatered sludge. The conveyor transported dewatered sludge cake directly into a skip, simplifying sludge collection and disposal. The compact modular design of the skid-mounted treatment operation ensured uninterrupted effluent management during peak tunneling periods. The efficient system was vital for treating the high flows of contaminants from the mechanical excavation and concrete lining works.