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Startup and Performance of Micro-aerobic EGSB Reactor Treating Actual Domestic Wastewater at Ambient Temperature


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Startup and Performance of Micro-aerobic EGSB Reactor Treating Actual Domestic Wastewater at Ambient Temperature
DONG Chun-juan1LIU Xiao2LV Bing-nan2
1.Department of Environment Engineering,Taiyuan University,Taiyuan 030009,China;2.School of Municipal and Environment Engineering,Harbin Institute of Technology,Harbin 150090,China
expanded granular sludge bed reactors micro-oxygenation ambient temperature domestic wastewater removal of nitrogen and phosphorus
To obtain the rapid startup and stable operation of the micro-aerobic expanded granular sludge bed(EGSB) reactor for simultaneous removal of carbon and nutrients(N and P) treating actual domestic sewage under ambient temperature,the EGSB reactor is operated for approximately 9 months consisting of startup stage and stable operation stage for the research on the formation of micro-aerobic granules and the simultaneous removal of the COD,N,and P at ambient temperature(15~26℃).By controlling the oxygenation rate in the aeration column,different concentrations of dissolved O2 are generated in the circulating fluid which supplies dissolved O2 to the granule sludge bed in the EGSB reactor and to generate micro-aerobic environments.The results show that it takes only about four months for the successful startup of the micro-aerobic EGSB for the treatment of actual domestic sewage under ambient temperature.About 5 months’stable operation,the micro-aerobic EGSB reactor treating actual domestic sewage at ambient temperature(15~26℃) runs well.With 213~867,26.5~72.1,1.7~81.7 and 3.8~17.3mg/L influent COD,NH3-N,TN,and TP concentrations,gradually increasing influent flow from 2.5 to 3.1 L/h and shortening HRT from 3.9 to 4.8 h,the average removal of COD,NH3-N,TN and TP can attain 93.4%,83.8%,74.7%,and 44.0%.And the effluent COD,NH3-N,TN and TP concentration are 29,10.0,14.0 and 4.7 mg/L,respectively,which accords with the IA,IB,IA and Ⅲ distinction of the GB 18918-2002.The effluent turbidity is about 6 NTU.At the stable operation stage,the redox potential in the inlet of the micro-aerobic EGSB reactor should be kept at about +15 mV.At the stable operation stage the settled velocity of the granules decreases to 11 m/h.But the granules are still held in the EGSB reactor without any washout.Moreover,the micro-aerobic EGSB reactor can keep the sludge concentration about 28 g/L and the mass ratio of mixed liquor volatile suspended solids to mixed liquor suspended solids as 0.74~0.77,which means the successful startup and stable operation for the micro-aerobic EGSB reactor.


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Last Update: 2012-04-30