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Siemens provides BNR system to municipal wastewater treatment plants in China |
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Wednesday, 07 October 2009 |
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 Siemens Water Technologies
& Engineering (Tianjin) Co., Ltd. (SWTE) signed a 42 million Renminbi
(approx. 4.2 million Euro) contract with Tianjin Capital Environmental
Protection Group Co., Ltd. in China (TCEPC) to provide a Biological Nutrient
Removal (BNR) system for upgrading and retrofitting the facilities of Tianjin
Xianyang Road Wastewater Treatment Plant (Xianyang Road WWTP) in Tianjin, China
to start up in April 2010.
According to the company’s
press release, the WWTP upgrade is one of the key sewage treatment projects for
pollution control of the Hai
River. The project was
awarded to Siemens following a successful BNR pilot study conducted for TCEPC
in June 2009. In
addition, the BNR system will be designed to significantly improve the effluent
discharge standard of Xianyang Road WWTP.
The BNR system uses an
aerated anoxic reactor, where simultaneous nitrification and de-nitrification
occurs, followed by two aerobic reactors to increase the efficiency of total
nitrogen removal when compared to conventional processes. With the BNR process,
the biological reaction tank footprint is minimized, and therefore the capital
cost is significantly reduced. In addition, the dissolved oxygen profile of
0/1/2 mg/l maintained in the three respective reactors greatly reduces oxygen
demand, thereby reducing energy usage.
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