PAC更新率对PAC-MBR耦合处理效能及污泥特性的影响  

Effect of PAC Replenishment Rate on Coupling Treatment Efficiency and Sludge Property of PAC-MBR

作　　者：张事 张忠义 鄢琨 徐望朋 ZHANG Shi;ZHANG Zhongyi;YAN Kun;XU Wangpeng(Changjiang Institute of Survey,Planning,Design and Research Co.,Ltd.,Wuhan 430010,China;CISPDR Corporation,Wuhan 430010,China;Hubei Key Laboratory of Basin Water Security,Wuhan 430010,China)

机构地区：[1]长江勘测规划设计研究有限责任公司,湖北武汉430010 [2]长江设计集团有限公司,湖北武汉430010 [3]流域水安全保障湖北省重点实验室,湖北武汉430010

出　　处：《净水技术》2024年第3期81-91,共11页Water Purification Technology

基　　金：国家自然科学基金青年基金项目(42307068);湖北省重点研发计划项目(2023BCB039)。

摘　　要：粉末活性炭(PAC)的定期回收和补充是混合膜生物反应器(PAC-MBR)稳定运行所必需的。研究探索了不同PAC更新率对PAC-MBR中污泥过滤特性和微生物群落的影响,创新性地提出通过PAC更新来提高微生物活性,以达到提高出水效能并减缓膜污染的效果。结果表明:PAC更新对CODCr和氮的去除没有显著影响;随着PAC更新率的增加,可溶性微生物产物逐渐降低,胞外聚合物浓度逐渐增加。PAC的更新能够降低MBR系统膜污染,同时提高过滤效率。微生物活性与PAC的更新率呈正相关规律。此外,由高通量测序可知由于添加新鲜的PAC,Proteobacteria(变形菌属)、Bacteroidetes(拟杆菌属)及Nitrospira(硝化螺旋菌属)的丰度增加,保证污染物的去除,同时Proteobacteria及Bacteroidetes造成的膜污染减少。最佳PAC更新率为1.67%,能够有效缓解膜污染并增强优势细菌结构。在推动PAC-MBR广泛应用方面,PAC更新被认为是一种有前景的方法。Regular recovery and supplement of powdered activated carbon(PAC)is necessary for the stable performance of hybrid membrane bioreactor(PAC-MBR).The influence of the replenishment of PAC on sludge filterability and microbial communities in hybrid MBRs was investigated.The results showed that the replenishment of PAC had no significant effect on CODCr and nitrogen removal,while soluble microbial products(SMP)concentration gradually decreased and extracellular polymeric substance(EPS)concentration gradually increased with increasing of PAC replacement ratio.The replenishment of PAC could reduce the membrane fouling process of MBR system and improve the filtration efficiency.Microbial activity was positive associated with the PAC replenishment ratio.In addition,according to the high-throughput sequencing,the abundance of Proteobacteria,Bacteroides and Nitrospira increased due to the addition of fresh PAC,ensuring the removal of pollutants,and the membrane fouling caused by Bacteroides and Proteobacteria decreased.The optimal PAC replenishment ratio was 1.67%,which could effectively alleviate—81—membrane fouling and enhance the dominant bacterial structure.The replenishment of PAC is considered as a promising method to promote the widespread application of hybrid MBRs.

关 键 词：粉末活性炭(PAC) 膜生物反应器 粉末活性炭更新 膜污染 微生物代谢产物 微生物群落 

分 类 号：X703[环境科学与工程—环境工程]