基于UASB/MBR的废水厌氧处理工艺优化  

Optimization of anaerobic wastewater treatment process based on UASB/MBR

作　　者：贺利飞 HE Li-fei(Shenmu Vocational and Technical College,Shenmu 719300,China)

机构地区：[1]神木职业技术学院,陕西神木719300

出　　处：《化学工程师》2023年第9期48-52,共5页Chemical Engineer

基　　金：2021年度神木职业技术学院校级课题(2021ZK06):化工生产技术精馏设备废料循环利用系统设计。

摘　　要：针对传统苯二甲酸废水处理工艺存在甲烷产率低、颗粒污泥流失严重、化学需氧量(COD)去除率低的问题,构建了新型UASB-MBR组合式反应器,并综合考察了组合式反应器运行稳定性、甲烷转化效率和污泥特性的变化。实验结果表明,废水pH值和总碱度始终维持在厌氧微生物适宜生存的范围,出水氧化还原电位(ORP)值始终维持在理想厌氧系统ORP小于-330mV范围内,此条件说明UASB-MBR组合式反应器可以长期稳定运行。在反应器运行的第一周期,COD去除率约为61.2%,甲烷产率约为0.7L·(m^(3)·d)^(-1)。当废水进入第二周期后,在乙二醇作用下,COD去除率和甲烷产量均有所提升,出水时分别为75.5%和1.05L·(m^(3)·d)^(-1)。运行稳定阶段,生物气中CH_(4)含量约为70%~80%。第二周期引入乙二醇后,提供了微生物生长的基质,加速细胞增殖与代谢,同时还可刺激微生物释放EPS,增强污泥的稳定性。Aiming at the problems of low methane yield,serious granular sludge loss and low removal rate of chemical oxygen demand (COD)in the traditional benzoic dicarboxylic acid wastewater treatment process,a new UASB-MBR combined reactor was constructed,and the changes in the operation stability,methane conversion efficiency and sludge characteristics of the combined reactor were comprehensively investigated.The test results showed that the pH value and total alkalinity of wastewater were always maintained within the range suitable for the survival of anaerobic microorganisms,and the oxidation reduction potential (ORP) of effluent was always maintained within the range of ORP less than-330mV in the ideal anaerobic system.This condition showed that the UASB-MBR combined reactor could operate stably for a long time.In the first cycle of reactor operation,COD removal rate was about 61.2%,and methane yield is about 0.7L·(m^(3)·d)^(-1).When the wastewater enters the second cycle,under the action of ethylene glycol,the removal rate of COD and the methane production rate were improved to a certain extent,which was 75.5%and 1.05L·(m^(3)·d)^(-1),respectively when the wastewater was discharged.During the stable operation stage,the ammonia content in the biogas is about 70%~80%.After the introduction of ethylene glycol in the second cycle,it provided a substrate for microbial growth,accelerates cell proliferation and metabolism,and also stimulated microorganisms to release EPS to enhance the stability of sludge.

关 键 词：废水厌氧处理 组合式反应器 甲烷产率 COD去除率 

分 类 号：TQ911[化学工程]