(1) Project site:
It is located at the intersection of Yungu Road and Qingluan Road in Hefei Economic & Technological Development Zone
Hefei Drainage Management Office.
100,000 m3/d sewage treatment.
(4) Date of operation:
(5) Investment, construction and operation:
It was invested and built by Hefei Construction Investment and Holding Co., Ltd. and operated by Anhui Guozhen Environment Protection Technology Joint Stock Co., Ltd.
2. Major environmental problems to be addressed
Reduce CODcr, BOD5, ammonia-nitrogen and total phosphorus discharged into Chaohu Lake, improve the water quality of Paihe River and Chaohu Lake in lower reaches, and protect the water source of Hefei City. The effluent shall be used as the supply source for Wangjiangou, a black and smelly water body in Hefei, so as to effectively improve the water environmental quality of Wangjiangou small watershed.
3. Technological process
Influent → coarse bar screen → inlet pump room → fine bar screen → grit chamber → oxidation ditch (A2O process ) → secondary sedimentation tank → secondary lifting pump house → coagulation reaction tank → inclined plate sedimentation tank → denitrification deep-bed filter → disinfection tank → effluent.
4. Environmental standards and/or main index limits to be followed
According to the Discharge Limits of Major Water Pollutants for Municipal Wastewater Treatment Plants and Industries in the Chaohu Basin (DB 34/2710-2016), for the effluent, CODcr≤40mg/L, NH3-N≤2.0mg/L, TN≤5mg/L, TP≤0.3mg/L.
5. Environmental pollution control effects
For the influent, BOD5 26.2~190.0mg/L, CODcr 62~475mg/L, SS48~380mg/L, NH3-N6.8~33.1mg/L, TN9.74~47.7mg/L, TP1.18~8.23mg/L；For the effluent, BOD5 2.0~4.0mg/L, CODcr 6~26mg/L, SS≤6mg/L, NH3-N 0.06~1.22mg/L, TN 0.83~4.72mg/L, TP 0.05~0.28mg/L.
6. Investment and operation cost:
The total investment of the project was about RMB 343 million, and the operation cost was RMB 0.49/t·water.
Highlights: Without changing the characteristics of oxidation ditch process, additional advanced treatment facilities were provided, and technological upgrade was integrated with energy saving and consumption reduction, so that the main indicators of effluent reached and maintained Class IV standards for surface water. The project is one of the sewage treatment plants in Anhui Province whose major indicators of the effluent firstly meet the Class IV standards for surface water.