Optimization of phosphorus removal in uniFed SBR system for domestic wastewater treatment

doi:10.1007/s11783-010-0244-8

Front Envir Sci Eng Chin

2010, Vol. 4

Issue (4) : 475-481 https://doi.org/10.1007/s11783-010-0244-8

RESEARCH ARTICLE

Optimization of phosphorus removal in uniFed SBR system for domestic wastewater treatment

Xuguang TANG(

), Shuying WANG, Yongzhen PENG

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

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Abstract

The characteristic of phosphorus removal and appropriate change of the traditional operation modes were investigated in UniFed sequencing batch reactor (SBR) laboratory-scale apparatus (40 L), treating actual domestic wastewater with low ratios of C/N (2.57) and C/P (30.18), providing theoretical basis for actual application of wastewater treatment plant. UniFed SBR system with its unique operation mode had the distinct superiority of phosphorus removal. On this occasion, the effect of volumetric exchange ratio (VER) and the method of influent introduction for phosphorus removal were studied. When the carbon source became the limiting factor to phosphorus release, the higher the VER, the lower the phosphorus concentration in the effluent. Three different influent patterns, including one-time filling, four-time filling, and continuous filling with the same quantity of wastewater could increase the release rate of anaerobic phosphorus from 0.082 to 0.143 mg·P·(L·min)^-1. Appropriate change of the traditional operation modes could optimize the efficiency of phosphorus removal. When the feed/ decant time was extended from 2 h to 4 h, the phosphorous removal efficiency increased from 59.93% to 88.45% without any external carbon source. In the mode of alternation of anoxic-aerobic (A/O) condition, phosphorous removal efficiency increased from 55.07% to 72.27% clearly. The carbon source in the influent can be used adequately, and denitrifying phosphorus removal was carried out in anoxic stage 2 (A2). This mode was optimal for the treatment of actual domestic wastewater with low C/N and C/P ratios.

Keywords UniFed sequencing batch reactor (SBR) phosphorus removal volumetric exchange ratio (VER) alternation of anoxic-aerobic (A/O) domestic wastewater

Corresponding Author(s): TANG Xuguang,Email:txg@emails.bjut.edu.cn

Issue Date: 05 December 2010

Cite this article:

Xuguang TANG,Shuying WANG,Yongzhen PENG. Optimization of phosphorus removal in uniFed SBR system for domestic wastewater treatment[J]. Front Envir Sci Eng Chin, 2010, 4(4): 475-481.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-010-0244-8
https://academic.hep.com.cn/fese/EN/Y2010/V4/I4/475

Fig.1

Schematic diagram of lab test of UniFed SBR system

Notes: 1 reactor; 2 influent tank; 3 effluent tank; 4 compressed air; 5 PC controller; 6 decant weir; 7-9 DO, ORP, pH probes; 10 electric valve; 11 filling pump; 12 electromagnetic valve; 13 sample point

Fig.2

Profiles of TP concentration for different modes of influent

Fig.3

Profiles of SCOD concentration for different modes of influent

Fig.4

Profiles of TP concentration for different modes of influent at different time

Fig.5

Effect of phosphorus removal of different VER at same SCOD concentration

Fig.6

Effect of phosphorus removal at different feed time

Fig.7

Profile of Phosphorus at different feed time

Fig.8

Effect of phosphorus removal at alternation of anoxic-aerobic condition

Fig.9

Profile of NH4+-N, NO2-N, NO3-N, PO43--P, and SCOD at alternation of anoxic-aerobic condition

Tab.1

Characteristics of domestic wastewater during the study period

Tab.2

Parameters of experimental operation in the feeding time section

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