Bioaugmentation treatment of PV wafer manufacturing wastewater by microbial culture.
The wastewater of silicon photovoltaic (PV) battery manufacturing contained polyethylene glycol (PEG) and detergents, which possessed the characteristics of high content of organics and low bioavailability, and then resulted in high treatment costs. To address the difficulties of existing treatment facilities in stably meeting discharge standards, eight tons of microbial culture (consisting of Bacillus sp. and Rhodococcus sp.) were added into the aerobic treatment unit. Subsequently, the effectiveness of the microbial culture in small-scale biological wastewater treatment was evaluated, and the operating conditions for engineering applications were optimized. The application study showed that the average chemical oxygen demand (COD) removal efficiency reached 95.0% when the pH value was 7, the gas-water ratio was 28:1, the reflux ratio was 50%, which indicated an increase of 51.2% contrasting with the situation without bioaugmentation. The volume load of the treatment facilities after augmentation increased by 127.9% and could tolerate the COD shock load reached 2,340 mg·L(-1). At last, the effluence met the class I standard of the Integrated Wastewater Discharge Standard (GB8978-1996).
Chinese Academy of Sciences, Chengdu Institute of Biology, Chengdu 610041, China and Key Laboratory of Environmental and Applied Microbiology, Chinese Academy of Sciences, Chengdu Institute of Biology, Chengdu 610041, China E-mail: tanzhl@cib.ac.cn.
Xiaohua
X
Zhu
Chinese Academy of Sciences, Chengdu Institute of Biology, Chengdu 610041, China and Key Laboratory of Environmental and Applied Microbiology, Chinese Academy of Sciences, Chengdu Institute of Biology, Chengdu 610041, China E-mail: tanzhl@cib.ac.cn.
Maoxia
M
Chen
Huizhou Shengxin Water Treatment Engineering Co., Ltd, Huizhou 516001, China.
Xin
X
He
Huizhou Shengxin Water Treatment Engineering Co., Ltd, Huizhou 516001, China.
Zili
Z
Xiao
Chinese Academy of Sciences, Chengdu Institute of Biology, Chengdu 610041, China and Key Laboratory of Environmental and Applied Microbiology, Chinese Academy of Sciences, Chengdu Institute of Biology, Chengdu 610041, China E-mail: tanzhl@cib.ac.cn.
Houzhen
H
Zhou
Chinese Academy of Sciences, Chengdu Institute of Biology, Chengdu 610041, China and Key Laboratory of Environmental and Applied Microbiology, Chinese Academy of Sciences, Chengdu Institute of Biology, Chengdu 610041, China E-mail: tanzhl@cib.ac.cn.
Zhouliang
Z
Tan
D001407:Bacillus / Q000378:metabolism*; D057919:Biological Oxygen Demand Analysis; D003902:Detergents / Q000378:metabolism*; D007220:Industrial Waste; D011092:Polyethylene Glycols / Q000378:metabolism*; D012240:Rhodococcus / Q000378:metabolism*; D062065:Wastewater; D014874:Water Pollutants, Chemical / Q000378:metabolism*; D018508:Water Purification
D003902:Detergents; D007220:Industrial Waste; D011092:Polyethylene Glycols; D062065:Wastewater; D014874:Water Pollutants, Chemical