Mn^(2+)强化臭氧调理对生物处理工艺的污泥原位减量效果

In situ reduction effect of Mn^(2+)enhanced ozone conditioning on sludge in biological treatment process

剩余污泥产量大、处置难已成为我国污水处理厂普遍面临的难题,近年来,采用臭氧氧化的旁路调理实现污泥原位减量技术受到关注。本研究采用小试序批式活性污泥法(SBR)装置,对比单独臭氧氧化(O_(3)组)与Mn^(2+)催化臭氧氧化(O_(3)+Mn^(2+)组)的旁路调理,对活性污泥系统的污泥原位减量效果、出水水质及污泥特性变化的差异,以验证Mn^(2+)催化臭氧氧化的实际应用效果。结果表明:O_(3)+Mn^(2+)组污泥原位减量效果优于O_(3)组,Mn^(2+)的添加对SBR工艺出水水质无明显负面影响,且O_(3)+Mn^(2+)调理后出水COD、NH_(4)^(+)-N、TP的去除率略高于O_(3)组;传统SBR工艺剩余污泥表观产率系数Yobs为0.32gMLSS/gCOD,O_(3)组下降至0.25gMLSS/gCOD,O_(3)+Mn^(2+)组下降至0.21gMLSS/gCOD,分别降低了21.9%和34.4%,从污泥浓度(MLSS)来看,O_(3)+Mn^(2+)组剩余污泥减量率为O_(3)组的2.6倍;同时,O_(3)+Mn^(2+)组活性污泥的絮凝、沉降、脱水性能均进一步改善。

Large production and difficult disposal of excess sludge has become a common problem faced by sewage treatment plants in China.In recent years,the use of ozone oxidation by-pass conditioning to achieve in-situ sludge reduction technology has attracted attention.A continuous SBR device was used to compare the differences in sludge reduction effect,effluent water quality and sludge characteristics between separate ozone oxidation(O_(3))and Mn^(2+)catalytic ozone oxidation conditioning(O_(3)+Mn^(2+))to verify the practical application effect of Mn^(2+)catalyzed ozone oxidation.The results showed that the in-situ reduction effect of sludge in O_(3)+Mn^(2+)group was better than that of O_(3) group,and the addition of Mn^(2+)had no obvious negative impact on the effluent quality of SBR process,and the removal efficiency of COD,NH_(4)^(+)-N and TP after O_(3)+Mn^(2+)conditioning was slightly higher than that of O_(3) group.The apparent sludge yield coefficient Yobs of traditional activated sludge system was 0.32gMLSS/gCOD,group O_(3) decreased to 0.25gMLSS/gCOD and the group O_(3)+Mn^(2+)decreased to 0.21gMLSS/gCOD,they decreased by 21.9%and 34.4%,respectively.From the sludge concentration(MLSS),the sludge reduction rate of group O_(3)+Mn^(2+)was 2.6 times of group O_(3).At the same time,the flocculation,sedimentation and dehydration performance of activated sludge in the group O_(3)+Mn^(2+)were all further improved.