A~2O-MBR-蠕虫床耦合系统污泥减量及膜污染控制效能研究

发布时间：2018-05-11 04:23

本文选题：蠕虫捕食 + 污泥减量　；参考：《哈尔滨工业大学》2017年硕士论文

【摘要】：蠕虫捕食污泥减量技术是利用能量在食物链传递过程中逐级递减的原理实现污泥削减,具有能耗低、效率高和环境友好性强等特点。研究者将蠕虫捕食减量技术与污水处理系统相结合,实现污泥减量与污水处理的高效协同。本文将蠕虫床与高效污水处理效能的厌氧-缺氧-好氧-膜生物反应器(A~2O-MBR)工艺相耦合,考察耦合工艺条件下污水处理效能、解析污泥减量机制及膜污染控制情况。A~2O-MBR-蠕虫床系统实现了高效的污水处理效果和污泥减量率,膜污染减缓。本文设计搭建了A~2O-MBR、A~2O-MBR-空白蠕虫床作为空白对照组,A~2O-MBR-蠕虫床耦合系统的污泥减量效果到达48.4%。通过对A~2O-MBR-蠕虫床耦合系统的优化,实现污水处理系统的出水水质的提高,总氮和总磷的去除去除效率达到77%和90%。TMP结果和膜污染阻力分析表明蠕虫床与A~2O-MBR系统的耦合可有效缓解膜污染进程。此外,结合显微镜镜检分析发现,A~2O-MBR-蠕虫床系统生物相种类上更为丰富,出现了线虫、寡毛虫等更高级的生物,说明系统稳定更好。解析了A~2O-MBR-蠕虫床耦合系统蠕虫捕食、污泥衰减、能量解偶联及微生物群落所引起的污泥减量机制。采用序批式实验进行A~2O-MBR-蠕虫床耦合系统污泥减量机制的研究发现,微厌氧的空白蠕虫床的污泥减量为886 mg/d,而蠕虫的投加可减少1584 mg/d活性污泥产量。系统运行过程中,存在着污泥自然衰减解体的现象,A~2O-MBR-空白蠕虫床系统和A~2O-MBR-蠕虫床系统与A~2O-MBR系统相比的污泥减量率分别为8.43%和13.23%。通过序批式实验发现A~2O-MBR-蠕虫床系统的耦合有助于强化能量解偶联现象,从而减小污泥产量。此外,微生物菌群群落结构分析表明A~2O-MBR-蠕虫床耦合系统内存在较多的慢性生长菌和捕食性菌种,有利于系统的污泥减量。探究了A~2O-MBR-蠕虫床耦合系统膜污染控制机制。蠕虫捕食后污泥的回流改变了系统好氧池的污泥性质。污泥脱水性能得到提高,有利于污泥后续的处理处置。A~2O-MBR-蠕虫床系统拥有最高的电位绝对值,不利于污泥絮体在膜表面的沉积,污泥粒径和污泥粘度的减小分别对膜污染进程有加剧和缓解作用。利用16S rRNA高通量测序分析微生物群落对膜污染分析显示,变形菌门(Proteobacteria)为优势类群,占总序列比重皆达到50%以上。属水平上,同一个系统内的泥饼层与污泥混合液相比,菌种的相对丰度都呈现减少趋势,但拥有共同的优势菌种Dechloromonas。将三组系统对比可知,A~2O-MBR-蠕虫床耦合系统的优势菌群显著,种群相对丰度分布集中,说明该系统对主要功能菌属的丰度有明显的强化作用。此外在A~2O-MBR系统泥饼层样品中发现了丰度较多的聚糖菌(Defluviicoccus),其分泌的胞外聚合物会加剧膜污染进程,而A~2O-MBR-蠕虫床系统含量较小。
[Abstract]:Worm predation sludge reduction technology is based on the principle of energy decreasing step by step in the course of food chain transmission, which has the characteristics of low energy consumption, high efficiency and strong environmental friendliness. The researchers combine worm predator reduction technology with sewage treatment system to achieve efficient collaboration between sludge reduction and sewage treatment. In this paper, the helminth bed is coupled with the anaerobic anoxic-aerobic membrane bioreactor (ANA2O-MBR) with high efficiency in sewage treatment, and the efficiency of wastewater treatment under the coupling conditions is investigated. Analysis of sludge reduction mechanism and membrane fouling control .An2O-MBR- worm bed system has achieved efficient sewage treatment and sludge reduction rate, and membrane fouling has been reduced. In this paper, the sludge reduction effect of A2O-MBR- blank worm bed as a blank control group has been designed and built, and the sludge reduction effect of A2O-MBR- worm bed coupling system has reached 48.4%. The effluent quality of sewage treatment system is improved by optimizing the coupling system of Agno _ 2O-MBR _ (-worm) bed. The removal efficiency of total nitrogen and phosphorus reached 77% and the results of 90%.TMP and membrane fouling resistance analysis showed that the coupling of worm bed and A~2O-MBR system could effectively alleviate the process of membrane fouling. In addition, combined with microscopic analysis, it was found that the biofacies of A2O-MBR- worm bed system were more abundant, and more advanced organisms such as nematodes and oligocaterpillars appeared, which indicated that the system was more stable. The mechanism of sludge reduction caused by worm predation, sludge attenuation, energy uncoupling and microbial community was analyzed. The sludge reduction mechanism of Agno 2O-MBR- worm bed coupling system was studied by sequencing batch experiment. It was found that the sludge reduction of microanaerobic blank worm bed was 886 mg / d, while the production of activated sludge of 1584 mg/d could be reduced by adding worm. During the operation of the system, there exists the phenomenon of natural sludge decay and disintegration. Compared with A~2O-MBR system, the sludge reduction rates of A2O2O-MBR-blank worm bed system and A2O-MBR- worm bed system are 8.43% and 13.23%, respectively. The results of sequencing batch experiments show that the coupling of A2O-MBR- worm bed system is helpful to enhance the energy uncoupling phenomenon and reduce sludge production. In addition, the analysis of microbial community structure showed that there were more chronic growth bacteria and predatory bacteria in the A2O-MBR- worm bed coupling system, which was beneficial to the sludge reduction of the system. The control mechanism of membrane fouling in Agno-MBR-worm bed coupling system is investigated. The reflux of worm feeding sludge changed the sludge properties of aerobic tank. The sludge dewatering performance is improved, which is beneficial to the sludge treatment and disposal. Aca2O-MBR- helminth bed system has the highest absolute potential, which is not conducive to sludge floc deposition on the membrane surface. The reduction of sludge particle size and sludge viscosity has aggravated and alleviated the membrane fouling process, respectively. Using 16s rRNA high-throughput sequencing analysis of microbial communities to analyze membrane fouling showed that Proteobacteria (Proteobacteria) was the dominant group, accounting for more than 50% of the total sequence. At the same level, the relative abundance of the mud cake layer in the same system decreased compared with the sludge mixture, but there was a common dominant bacteria species Dechloromonas. By comparing the three groups of systems, we can see that the dominant flora of A2O-MBR-worm bed coupling system is significant, and the distribution of population relative abundance is concentrated, which indicates that the system has obvious enhancement effect on the abundance of the main functional genera. In addition, in the samples of mud cake layer of the A~2O-MBR system, we found that there are more abundant bacteria, the extracellular polymers secreted by them will aggravate the process of membrane fouling, while the content of A2O-MBR- helminth bed system is small.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X703

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