Abstract:

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 (O₃) and Mn²⁺ catalytic ozone oxidation conditioning (O₃+Mn²⁺) to verify the practical application effect of Mn²⁺ catalyzed ozone oxidation. The results showed that the in-situ reduction effect of sludge in O₃+Mn²⁺ group was better than that of O₃ group, and the addition of Mn²⁺ had no obvious negative impact on the effluent quality of SBR process, and the removal efficiency of COD, NH₄⁺-N and TP after O₃+Mn²⁺ conditioning was slightly higher than that of O₃ group._{The apparent sludge yield coefficient Yobs of traditional activated sludge system was 0.32gMLSS/gCOD, group O3 decreased to 0.25gMLSS/gCOD and the group O3+Mn²⁺ 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 O3+Mn²⁺ was 2.6 times of group O3. At the same time, the flocculation, sedimentation and dehydration performance of activated sludge in the group O3+Mn²⁺ were all further improved.}

Key words: manganese ion, ozone oxidation, chemical oxygen demand (COD), sludge reduction, sludge characteristics

摘要：

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（O₃组）与Mn²⁺催化臭氧氧化（O₃+Mn²⁺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Mn²⁺催化臭氧氧化的实际应用效果。结果表明：O₃+Mn²⁺组污泥原位减量效果优于O₃组，Mn²⁺的添加对SBR工艺出水水质无明显负面影响，且O₃+Mn²⁺调理后出水COD、NH₄⁺-N、TP的去除率略高于O₃组；传统SBR工艺剩余污泥表观产率系数Y_obs为0.32gMLSS/gCOD，O₃组下降至0.25gMLSS/gCOD，O₃+Mn²⁺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，O₃+Mn²⁺组剩余污泥减量率为O₃组的2.6倍；同时，O₃+Mn²⁺组活性污泥的絮凝、沉降、脱水性能均进一步改善。

关键词: 二价锰离子, 臭氧氧化, 化学需氧量, 污泥减量, 污泥特性