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| Effects of o-aminophenol on sludge yield and microbial activity |
| WEI Xue-yu1,2, LIU Zhi-gang2,3, YAN Yu-tao2, XU Xiao-ping1, WANG Xiao-ju2 |
1. The School of Civil Engineering and Architecture, Anhui Polytechnic University, Wuhu 241000, China;
2. College of Environment, Hohai University, Nanjing 210098, China;
3. Ningbo Water Supply Co., Ltd, Ningbo 315041, China |
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Abstract In order to view sludge reduction and estimate the inhibitory effect of chemical uncoupler on the activity of sludge,the influence of o-aminophenol (oAP) addition on efficiency of sludge reduction.The microbial activity and variation of removal efficiency in NH4+-N and CODCr induced by addition oAP were investigated through batch tests.Four indexes,TTC-electron transport system activity (TTC-ETS),INT-electron transport system activity (INT-ETS),ammonia uptake rate (AUR) and specific oxygen uptake rate (SOUR) were used to characterize the inhibitory effects of the metabolic uncoupler on the sludge activity.The results showed that the average apparent sludge yield of Yobs was decreased from 0.443 to 0.256MLSS/mgCOD for 42.20%,when oAP concentration was set as 12mg/L.The inhibitory effect of oAP on removing NH4+-N was more significant than on decomposing organics,and nitrifying bacteria were more sensitive than heterotrophic bacteria to the inhibitory effects of oAP,which showed the toxic influence on the activity of sludge.Through comparing the inhibition rates of NH4+-N removal efficiency,AUR is supposed to be the most effective index to characterize the inhibitory effects of metabolic uncoupler.Besides,TTC-ETS activity can be used as the optimum index to characterize inhibitory effects of oAP,because its median inhibitory concentration was the minimum of 35.51mg/L,as the minimum one among the four indexes.
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Received: 14 December 2016
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