剥离黏液层改性污泥回用对污泥颗粒化过程的影响  

Effect of recycling the slime layer extracted sludge on the sludge granulation

作　　者：上官一将 文正红 贾燕茹 杨成建[1,2,3] 李志华 SHANGGUAN Yijiang;WEN Zhenghong;JIA Yanru;YANG Chengjian;LI Zhihua(School of Environment and Municipal Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Xi’an Key Laboratory of Intelligent Equipment Technology for Environmental Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Key Laboratory of Northwest Water Resource,Environment and Ecology,MOE,Xi’an University of Architecture and Technology,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学环境与市政工程学院,陕西西安710055 [2]西安市环境工程装备智能化技术重点实验室,陕西西安710055 [3]西安建筑科技大学西北水资源与环境生态教育部重点实验室,陕西西安710055

出　　处：《工业水处理》2024年第4期76-83,共8页Industrial Water Treatment

基　　金：国家自然科学基金项目(52070149,51878539);陕西省科技创新团队项目(2023-CX-TD-36);陕西省重点研发计划项目(2023-YBNY-269)。

摘　　要：胞外聚合物(Extracellular polymeric substances,EPS)的资源化回收已经得到了广泛研究,但关于剥离EPS后污泥就地回用至污水生物处理系统的研究甚少。通过对剥离黏液层改性后的污泥进行考察发现,改性后的污泥仍具有良好的微生物活性,具备较好的底物降解能力;且相较于原泥,改性污泥的胞外蛋白质与胞外多糖质量比[m(PN)/m(PS)]由1.37提升至1.84,Zeta电位绝对值降低了25.97%,絮凝性能提升,因此改性污泥可回用于污水生物处理系统,并改善其性能。进一步地,研究了改性污泥连续回用至DE型氧化沟系统对其性能及污泥性质的影响,结果表明,随着回用天数的增加,污泥的m(PN)/m(PS)升高,系统内污泥开始颗粒化,粒径大于200μm的颗粒污泥占比达到了30%以上,污泥颗粒化持续增强。因此,连续回用剥离黏液层改性污泥至DE型氧化沟系统,可以促使系统内污泥颗粒化,从而为连续流氧化沟系统的污泥颗粒化提供了新方法。Recycling of extracellular polymeric substances(EPS)has been extensively explored.However,in-situ re-use of EPS-extracted sludge to the sewage treatment system has been rarely reported.After extracting the slime layer of activated sludge,the modified sludge still had favorable microbiological activity,and substrate degradation poten-tial.Compared with the raw sludge,the mass ratio of protein to polysaccharide increased from 1.37 to 1.84,the abso-lute value of Zeta potential decreased by 25.97%,and the flocculation capacity was improved.Therefore,the modi-fied sludge could to be used in the sewage treatment system and improved its performance.Furthermore,the effects of continuous reuse of modified sludge to DE oxidation ditch system on its performance and sludge properties were studied.The results suggested that the m(PN)/m(PS)increased with the extension of reuse days and the sludge began granulation,and more than 30%of granular sludge was larger than 200µm,indicating the continuous granulation.Therefore,continuous reuse of modified sludge stripped of slime layer into DE oxidation ditch system can promote sludge granulation,providing a new approach to cultivate granular sludge in continuous flow systems.

关 键 词：黏液层 改性污泥 回用 颗粒污泥 DE型氧化沟 

分 类 号：X703[环境科学与工程—环境工程]