MBR-蠕蟲(chóng)床-化學(xué)除磷聯(lián)合系統(tǒng)污水處理及膜污染菌群解析
[Abstract]:The treatment and disposal of sewage sludge greatly increase the cost of sewage treatment, so the water treatment technology that can reduce sludge synchronously during the process of sewage treatment has attracted much attention. In the previous study, the remaining sludge of MBR was discharged into the worm bed, and the high efficiency of sludge reduction, the improvement of sludge properties and membrane were realized by the predation of worms. Effective control of pollution. In order to further analyze the relationship between the removal of pollutants in the MBR- worm bed joint system, the relationship between the control mechanism of membrane pollution and the change of microbial flora, and to solve the problem of phosphorus release caused by the reduction of the sludge in the joint system, this study takes the MBR- worm bed as the study of the image and inspects the urban sewage in the unit of the joint system. The effects of sludge morphological structure, sludge characteristics and microbial flora change on membrane pollution were removed, and the MBR- chemical phosphorus removal combined system was constructed to clarify the optimal control conditions and to realize the efficient removal of phosphorus in sewage. The study on the relationship between the removal of pollutants and microbial flora in the combined system showed that the relationship between the removal of contaminants and microbial flora in the combined system showed that The predation and metabolism of worm bed lead to the chemical oxygen demand (COD) of MBR in the combined system, the increase of ammonia nitrogen (NH4+-N) and total phosphorus (TP) load by 0.8%, 3.4% and 11.3% respectively, but the removal rate of MBR to three in the combined system is 2%, 5.2% and 1.7%, respectively, compared with the traditional MBR, and the MBR- worm bed combined system has a higher sewage treatment efficiency than the traditional MBR. In the MBR- worm bed joint system, the functional bacteria related to protein degradation, carbohydrate transformation and ammoxidation have been enriched, and Saprospiraceae bacterium, Klebsiella and Dechloromonas are increased by 4%, 6.5% and 5.9% respectively compared with the traditional MBR, and the activity of ammonia oxidizing bacteria (AOB) is higher than that of the traditional MBR. The study of the mechanism and the relationship with the microbial flora showed that the sedimentation of the sludge in the combined system was increased by 37.8%, the sludge structure was more closely, the activity of the protease was increased by 19.1%, and the hydrolysis of the protein of the key membrane pollutants in the combined system was promoted, so that the sludge mixture and the mud cake layer were in the extracellular polymer (EPS) in the combined system, compared with the traditional MBR. Compared with the traditional MBR, the protein decreased by 33.6% and 27.3%. respectively. Compared with the traditional MBR, the bacteria in the combined system secreted Zoogloea of the colloid substances such as EPS or carbohydrate, and decreased the alpha and beta -proteobacteria by 4.4%, 2.3% and 5.6%, respectively, and increased the Frankia, Clostridium and Actinomyces by 55. to slow the membrane fouling. 5%, Firmicutes bacterium of soluble microbial metabolites (SMP) and EPS can be degraded by secreting protein and polysaccharide hydrolase, and Flavobacterium and Chloroflexus are increased by 14.8%, 8.3% and 5.0%. respectively. The sludge structure, characteristics and changes of bacteria groups make the combined system membrane fouling effectively control, and the membrane fouling cycle is more than the traditional MBR. The study on the construction and operation efficiency of 2.5 times longer.MBR- worm bed chemical phosphorus removal combined system shows that chemical removal of phosphorus can make the removal rate of TP in the combined system reach 20.8 + 3.3%, increase by 19.6% than that of MBR- worm bed, and 16.6% from the traditional MBR; chemical phosphorus removal reduces the TP content of sludge in worm bed by 46.7%, and the activity of acid phosphate enzyme increases 32.. 8%. effectively reduced the concentration of COD and TP in the supernatant of worm bed by chemical phosphorus removal and the reflux of the treated supernatant to the worm bed, which reduced the COD and TP load of MBR by 40% and 72% respectively. At the same time, the addition of chemical phosphorus reduced the concentration of protein and polysaccharide in SMP and increased the particle size of the sludge floc. The filtration and dehydration of the sludge floc reduces the membrane fouling rate of the chemical phosphorus removal combined system. In summary, the MBR- worm bed chemical phosphorus removal combined system realizes the effective treatment of urban sewage and the effective control of the membrane pollution. It provides theoretical and technical support for the research and application of biological prey sludge reduction technology and the research and application of MBR.
【學(xué)位授予單位】:哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2017
【分類號(hào)】:X703
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