原位臭氧氧化污泥减量工艺的运行效能

采用ASBR/SBR原位臭氧污泥减量工艺,重点研究了原位臭氧氧化对SBR段污泥产率和出水水质的影响。两个相同的ASBR/SBR组合工艺同时运行,每隔3个周期向臭氧投加组SBR的曝气阶段原位间歇投加臭氧,臭氧投加量为0.027 g O3/g MLSS,连续运行40 d;对照组不投加臭氧作为对比。结果表明,原位臭氧氧化实现污泥减量约43.9%,臭氧投加组SBR段平均污泥产率系数为0.1447 g SS/g SCOD,而对照组为0.2580 g SS/g SCOD,投加组没有惰性污泥的累积,并且污泥沉淀性能得到改善。原位臭氧氧化对出水水质影响不大,投加组与对照组相比,臭氧投加3周期后的出水COD、NH4+-N、TN和TP平均值分别为47.8、0.76、14.1和6.4 mg/L,去除率分别下降了4%、2%、3%和7.7%,其中COD、NH4+-N和TN均能达到《城镇污水处理厂污染物排放标准》(GB18918-2002)一级A标准。

Performance of in-situ ozonation sludge reduction process

With the use of the ASBR/SBR in-situ ozonation sludge reduction process,the influence of in-situ ozonation oxidization of SBR sludge on the SBR sludge yield and effluent quality was extensively studied.Two same combined ASBR/SBR reactors were operated with or without a batch-type ozonation dosage for 40 days.The ASBR/SBR reactor without the ozonation dosage was operated as the control reactor.The 0.027 g O3/g MLSS ozone dosage was added in-situ intermittently into the SBR aeration sludge every three cycles.The results showed that the SBR excess sludge reduction ratio and sludge yield rate was about 43.9% and 0.1447 g SS/g SCOD,respectively with the in-situ ozonation.However,the sludge yield rate of the control combined ASBR/SBR was about 0.2580 g SS/g SCOD.No extra inactive sludge was accumulated and the sludge settalbility was improved obviously with the in-situ ozonation.The reactor effluent quality was hardly influenced by the in-situ ozonation.After three cycles operation,the effluent COD,NH+4-N,TN and TP average concentration were kept about 47.8mg/L,0.76 mg/L,14.1 mg/L and 6.4 mg/L,respectively.The effluent COD,NH+4-N,TN and TP removal rates were reduced by 4%,2%,3% and 7.7%,respectively compared with the control one.The effluent COD,NH+4-N and TN concentration could meet the effluent emission Level 1 A Standard of Discharge Standard of Pollutants for Municipal Wasterwater Treatment Plant(GB18918-2002).