MBR发生丝状菌膨胀前后出水THMs生成特性的研究

发布时间：2018-10-24 20:22

【摘要】：水资源短缺是制约全球经济发展的重要因素,更是未来人类社会发展急需解决的大问题。城市污水再生可以改善水环境污染,还可以缓解水资源短缺的问题,是一种提高水资源的综合利用率的有效手段。在本研究中,正常的膜生物反应器(MBR)和发生丝状菌污泥膨胀后的MBR同时运行用来处理人工配制的废水。本研究对比了发生丝状菌膨胀前后,MBR出水水质特征,并分析了污泥胞外聚合物(EPS)、溶解性微生物代谢产物(SMP)和出水溶解性有机物(DOM)的化学特性以及氯消毒过程中三卤甲烷(THMs)的生成特性。MBR发生丝状菌膨胀后,MBR出水的水质受影响并不大。正常MBR出水的溶解性有机物的小分子量物质(5 kDa)更多,约占所有分子量有机物的92.43%,而发生丝状菌污泥膨胀后的MBR出水中小分子量物质的占比大大减小,仅为75.18%。丝状菌膨胀后MBR出水中的亲水性物质(HiS)占比大大增加,约占总体比例的三分之二,而正常MBR的出水则表现出更高的疏水性。MBR发生丝状菌膨胀之后,出水中多糖和蛋白的比例大大上升。在丝状菌MBR的出水中蛋白质类的物质、富里酸类的物质和腐殖酸类的物质要远远高于正常MBR的出水。丝状菌MBR的出水经过氯消毒之后的三卤甲烷生成势仅为正常MBR出水的30.15%,但同时丝状菌MBR的出水表现出了更高的溴结合能力,所产生的三卤甲烷氯消毒副产物(DBPs)有着更大的毒性。MBR出水有机物主要以慢反应物质为主,即大部分出水有机物与氯反应需要较长期的过程。MBR出水、EPS和SMP中主要荧光性物质为微生物代谢产物类物质;MBR出水中有机物以亲水性物质为主,疏水性物质中以疏水性酸为主,且疏水性酸的THMs生成能力远远高于其他组分。另外,与EPS相比,SMP有较高的THMs生成能力,且氯消毒后生成的THMs的毒性较高。
[Abstract]:The shortage of water resources is an important factor restricting the development of global economy, and it is also an urgent problem for the development of human society in the future. Urban sewage regeneration can improve the pollution of water environment and alleviate the shortage of water resources. It is an effective means to improve the comprehensive utilization of water resources. In this study, normal membrane bioreactor (MBR) and filamentous sludge bulking (MBR) were used to treat artificial wastewater simultaneously. The characteristics of MBR effluent quality before and after filamentous expansion were compared. The chemical characteristics of soluble microbial metabolite (SMP) and soluble organic matter (DOM) in sludge extracellular polymer (EPS),) and the formation characteristics of trihalomethane (THMs) during chlorination were analyzed. After the filamentous expansion of MBR occurred, the effluent water of MBR was obtained. Quality is not affected much. The small molecular weight of dissolved organic matter (5 kDa) in normal MBR effluent was more, accounting for 92.43% of all molecular weight organic matter, while the proportion of medium and small molecular weight substances in MBR effluent after filamentous sludge bulking decreased greatly, only 75.18%. After the expansion of filamentous bacteria, the proportion of hydrophilic substance (HiS) in the effluent of MBR increased greatly, accounting for about 2/3 of the total proportion, while the effluent of normal MBR showed higher hydrophobicity. The ratio of polysaccharides to protein in the effluent increased greatly. The contents of protein, fulvic acid and humic acid in the effluent of filamentous MBR were much higher than those in the effluent of normal MBR. The formation potential of trihalomethane in effluent of filamentous MBR after chlorine disinfection was only 30.15 of that of normal MBR, but the effluent of MBR showed higher bromine binding ability. (DBPs), a by-product of trihalomethane disinfection, is more toxic. The main organic substances in MBR effluent are slow reactive substances. The main fluorescent substances in EPS and SMP were microbial metabolites, while in MBR effluent, hydrophilic substances were mainly hydrophilic substances, hydrophobic substances were hydrophobic acid, hydrophobic acid was the main hydrophobic substances, and the main fluorescent substances in EPS and SMP were microbial metabolites. And the hydrophobic acid THMs formation ability is much higher than other components. In addition, compared with EPS, SMP had higher THMs production ability and higher toxicity of THMs after chlorine disinfection.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X703

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