连续流超声对低水温活性污泥性能和污泥减量的影响  

Effect of Continuous Ultrasonication on Activated Sludge Performance and Sludge Reduction under Low Water Temperature

作　　者：李道甲 员建 马华继[1,2] 王梦杰 焦秀梅[1,2] 张春青 汪艳宁 张沁唯[1,2] LI Dao-jia;YUAN Jian;MA Hua-ji;WANG Meng-jie;JIAO Xiu-mei;ZHANG Chun-qing;WANG Yan-ning;ZHANG Qin-wei(School of Environmental and Municipal Engineering, Tianjin Chengjiart University, Tianjin 300384, China;Tianjin Key Laboratory of Aquatic Science and Technology, Tianjin 300384 , China;Beijing Hui QingYuan Water Business Scientific Co. Ltd., Beijing 100015 , China)

机构地区：[1]天津城建大学环境与市政工程学院,天津300384 [2]天津市水质科学与技术重点实验室,天津300384 [3]北京汇清源水务科技有限公司,北京100015

出　　处：《中国给水排水》2019年第9期16-22,共7页China Water & Wastewater

基　　金：天津市高等学校科技发展基金资助项目(20140518);天津市水质科学与技术重点实验室开放基金资助项目(TJKLAST-PT-2017-01)

摘　　要：低水温条件下活性污泥的生物活性较低,且易于发生微丝菌污泥膨胀,导致泥水分离困难,出水水质变差。建立了连续流超声波调控活性污泥系统,在(15±1)℃水温下进行超声调控活性污泥性能和污泥减量研究结果表明:超声处理对系统的影响随着超声能量密度的加大和超声处理时间的延长而加强在0.133-0.667W/niL和5-10min/d超声处理条件下,系统表观污泥产率系数介于0.19-0.27kgVSS/kgCOD之间,污泥减量率(SRE)为22.86%-45.71%:超声处理能在一定程度上促进系统中有机物的去除,COD去除率超过86%,出水COD浓度稳定低于50mg/L;超声处理一定程度降低了污泥沉降速率,导致污泥容积指数升高,但在沉淀30min后,超声处理对污泥沉降速率的影响不大,超声处理系统的SVI值没有超过220mL/g;超声处理会导致活性污泥的胞外聚合物(EPS)含量增加,相对增加量为17.14-51.96mg/gMLSS,相对比增加速率为0.222-0.866mg/(gMLSS·d)。The bio-activity of activated sludge under low water temperature is lower, and the corresponding system is prone to occur filamentous bulking. So its sludge setteability and effluent quality are deteriorated. A continuous flow ultrasonically controlled activated sludge system was established to perform activated sludge performance and sludge reduction under the water temperature of ( 15 ± 1 )℃. The results indicated that the effect of ultrasonication on the treatment system was strengthened with the increase of ultrasonic density and time. With the ultrasonic density of 0. 133 - 0. 667 W/mL and ultrasonic time of 5 - 10 min/d, the observed biomass yield ( Ynhs) of system was 0. 19 - 0. 27 kgVSS/ kgCOD , and its sludge reduction rate ( SRE) reached 22. 86%- 45. 71 %. The ultrasonication promoted the removal of organic pollutants in the water, the COD removal efficiency was more than 86%, and the effluent COD concentration was stable below 50 mg/L. The ultrasonication decreased the sludge settling velocity to some degree, and increased the sludge volume index ( SVI). While there was little effect on the sludge settling velocity after sedimentation of 30 in in, and the SVI in the controlled reactor was less than 220 mL/g. The ultrasonication promoted the increase of the extracellular polymeric substances (EPS) in the activated sludge. The relative increment of EPS was 17. 14 -51.96 mg/gMLSS, and the relative specific increment rate of EPS was 0. 222 -0. 866 mg/( gMLSS·d).

关 键 词：活性污泥 低水温 连续流超声处理 污泥性能 污泥减量 

分 类 号：TU992[建筑科学—市政工程]