Severn Trent Services for China wastewater plant
17 Aug 2012
Shanghai, China - Severn Trent Services (STS) has announced a contract with the Yangtaizi Wastewater Treatment Plant in the city of Bengbu in China’s Anhui Province, to provide its TETRA Denite denitrification system for a $41-million water pollution control development.
The system is designed to simultaneously remove total phosphorus (TP), nitrate-nitrogen (NO3-N) and total suspended solids (TSS) to meet the stringent Level 1 A standard for effluent discharge.
The STS system act as a bioreactor to achieve denitrification; the technology allows the growth of microorganisms on the gravel surface and filter layer. Such biological treatment processes can also achieve level 1 A standard quality of effluent discharge through secondary wastewater treatment.
The system is both a fixed-biofilm bioreactor and a deep bed filter, whose main function is to remove NO3-N and TSS. TP is reduced by adding flocculant to meet a high standard of effluent discharge.
The denitrification filter, says STS, can simultaneously remove NO3-N, TP and SS to meet the extremely stringent discharge requirements in a single step. This, it adds, reduces the floor space, capital investment costs and operating costs while ensuring space for future upgrade and transformation.
The Yangtaizi facility is one of the first wastewater treatment plants to meet the Level 1 A standard of effluent discharge in China. The plant’s construction was undertaken as part of the State’s “three rivers and three lakes” water pollution control project.
The plant will account for nearly one-third of the total wastewater treatment in the surrounding urban areas. Phase II of the project is expected to reach a scale capable of treating 24 million gallons of wastewater per day.
