Modified Operation in SBR Applied to Decentralized Domestic Sewage Treatment for High Quality Effluent

Lin Jiang Yuan, Jie Zhao, Kai Yang, Zhi Ying Wang

 

ABSTRACT

SBR can be used as the sole reactor for SS, COD, and nutrient removal and is suitable for decentralized wastewater treatment, but it is noticed that the SBR is difficult to obtain high quality effluent meeting up to Grade 1A standard in China in many practical cases. In this study sewage from a university campus was used as decentralized sewage, and its treatment of SBR was investigated. Two operating modes were adopted to study whether SBR can serve as sewage treatment with high quality effluent that may meet the standard of water reuse to some extent. The results show that, after changing anaerobic and aerobic stage, the SBR can remove as more as 90%, 92%, 67% and 89% of COD, ammonium nitrogen, total nitrogen and phosphate of the sewage, respectively, and effluent meet water quality for reuse. Proper alternation of anoxic condition (lasting for 30min before feeding), anaerobic condition followed (lasting 1h after feeding) and aerobic condition (for 2h with low dissolved oxygen less than 2mg/l all the way) is the foundation for effluent of good quality and stable operation. The results suggest that the SBR performed very well to treat sewage of low carbon to nitrogen ration and large fluctuation in water quality, and it is suitable for decentralized wastewater treatment and water reclamation. Operation control of the SBR can not only save energy, but also can dispense with advanced water treatment of water reclamation to some extent.

 

Keywords: Decentralized wastewater treatment; SBR; Water reclamation; Biological nutrient removal

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doi:10.11912/jws.1.3.259-268