Advanced nitrogen and phosphorus removal in A<sup>2</sup>O-BAF system treating low carbon-to-nitrogen ratio domestic wastewater

doi:10.1007/s11783-011-0360-0

Front Envir Sci Eng Chin

2011, Vol. 5

Issue (3) : 474-480 https://doi.org/10.1007/s11783-011-0360-0

RESEARCH ARTICLE

Advanced nitrogen and phosphorus removal in A²O-BAF system treating low carbon-to-nitrogen ratio domestic wastewater

Jianhua WANG, Yongzhen PENG(

), Yongzhi CHEN

Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China

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Abstract

A laboratory-scale anaerobic-anoxic-aerobic process (A²O) with a small aerobic zone and a bigger anoxic zone and biologic aerated filter (A²O-BAF) system was operated to treat low carbon-to-nitrogen ratio domestic wastewater. The A²O process was employed mainly for organic matter and phosphorus removal, and for denitrification. The BAF was only used for nitrification which coupled with a settling tank Compared with a conventional A²O process, the suspended activated sludge in this A²O-BAF process contained small quantities of nitrifier, but nitrification overwhelmingly conducted in BAF. So the system successfully avoided the contradiction in sludge retention time (SRT) between nitrifying bacteria and phosphorus accumulating organisms (PAOs). Denitrifying phosphorus accumulating organisms (DPAOs) played an important role in removing up to 91% of phosphorus along with nitrogen, which indicated that the suspended activated sludge process presented a good denitrifying phosphorus removal performance. The average removal efficiency of chemical oxygen demand (COD), total nitrogen (TN), total phosphorus (TP), andNH4+-N were 85.56%, 92.07%, 81.24% and 98.7% respectively. The effluent quality consistently satisfied the national first level A effluent discharge standard of China. The average sludge volume index (SVI) was 85.4 mL·g^-1 additionally, the volume ratio of anaerobic, anoxic and aerobic zone in A²O process was also investigated, and the results demonstrated that the optimum value was 1∶6∶2.

Keywords Anoxic zone and biologic aerated filter (A²O-BAF) system domestic wastewater with low carbon-to-nitrogen ratio advanced nitrogen and phosphorus removal denitrifying phosphorus removal

Corresponding Author(s): PENG Yongzhen,Email:pyz@bjut.edu.cn

Issue Date: 05 September 2011

Cite this article:

Jianhua WANG,Yongzhen PENG,Yongzhi CHEN. Advanced nitrogen and phosphorus removal in A²O-BAF system treating low carbon-to-nitrogen ratio domestic wastewater[J]. Front Envir Sci Eng Chin, 2011, 5(3): 474-480.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-011-0360-0
https://academic.hep.com.cn/fese/EN/Y2011/V5/I3/474

Tab.1 Characteristics of influent wastewater/(mg·L)

Tab.2 the function and HRT of each reactor

Fig.1 Schematic diagram of AO-BAF process.
1. inflow tank; 2. AO process; 3. settling; 4. mid-tank; 5. BAF process; 6. effluent tank; 7. nitrate return; 8. sludge return; 9. residual activated sludge; 10. air diffuser; 11. effluent; 12. stirrer; 13. backwash water; 14. peristaltic pump; 15. high-pressure pump

Fig.2 Immobilization of microorganism on ceramsite. (a) Before biofilm formation; (b) after BAF start-up

Fig.3 The removal efficiencies of COD, TN, TP,

Fig.4 The COD change along the AO-BAF

Fig.5 Evolution of the nitrogen concentration in AO-BAF reactors

Fig.6 Evolution of the phosphorus concentration in AO-BAF reactors

Fig.7 Phosphorus release and uptake test profile for sludge characterization in AO reactors. (a) Phosphorus release and uptake test; (b) profiles of nitrate concentration

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