【作者】 曾恬静；

【导师】 李小明；

【作者基本信息】 湖南大学 ， 环境工程， 2009， 硕士

【摘要】 随着近年来经济工业等社会生产生活各方面的飞速发展,环境污染日益严重,伴随着生活污水排入自然界的氮、磷等成为污染天然水体的主要因素,因此对水体中氮、磷以及其中有机物的处理成为水污染处理研究中重要的课题。在王冬波等人的前期研究中发现,在采用内循环SBR反应器处理模拟城市生活污水的脱氮除磷的过程中,进水后未经过厌氧段而直接曝气,仍能达到良好的除磷效果。本研究基于王冬波等人的前期研究成果,设置两个pH值分别为8.0(R1)和7.0(R2)的SBR单级好氧反应器。稳定运行后,R1中磷进水浓度的为20mg/L,出水浓度降低至3mg/L一下,去除率达到90%。R2磷进水浓度同样为20mg/L,出水浓度在4-6mg/L之间,去除率为75%-85%之间。与此同时两个反应器中COD去除率都达到了95%以上。由此可知在SBR单级好氧工艺中,pH值8.0比pH值7.0更适合除磷的进行。在经过前期优化条件的确定后,研究者选用在生活污水中广泛存在的VFAs作为SBR单级好氧工艺的有机碳源研究其除磷性能及可能的生化过程。在pH值为7.5-8.5的条件下,以乙酸钠(R1)和丙酸钠(R2)为反应器的单一碳源,按照好氧(4h)→沉淀出水(0.5h)→静置(7.5h)的方式运行。稳定运行后,R1磷进水浓度为20mg/L,出水浓度为6-7mg/L,去除率为65%-75%,静置结束后系统中释磷量为0.5mg/L。R2磷进水浓度为20mg/L,出水浓度为2-3mg/L,去除率达到85%以上,静置后系统中释磷量为3mg/L。两反应器对COD的去除效果良好,去除率达到95%以上。R1主要的储能物质为PHA,R2主要的储能物质为糖原质,在外碳源的消耗过程中,磷浓度的降低不明显,而内碳源则得以积累。在内碳源消耗时,系统中磷的浓度迅速降低。R2系统中微生物生化过程的不同要求更高的能量水平,因而另一储能物质聚磷在其生化过程中扮演着重要的角色,在长达8h的静置期中系统中微生物需要通过水解在好氧段合成的聚磷来为自身生长与新陈代谢提供能量。更多还原

【Abstract】 In recent years, the economy and the industry develop speedily. it is serious increasingly that the nitrogen, phosphorus compound causes the phenomenon of water pollution. Therefore, the wastewater not only needs to remove COD, but also needs to take off nitrogen and phosphorus. It had become the most important question of the water pollution research.Wang Dongbo et al discoverd a phenomenon by the anteriorly research, that is in the course of nitrogen and phosphorus removal of municipal wastewater with inner-loop SBR, wastewater enterd the aeration phase directly, without anaerobic phase, the anaerobic phase was conventionally considered as a key phase for phosphorus removal, but a predominant phosphorus removal were still achieved.The research based on Wang Dongbo’s research. Set two reactors, pH was 8.0(R1)and 7.0(R2). After two reactors operate smoothly, the R1’s influent of phosphorus was 20mg/L and effluent was under 3mg/L, the removal rate was 90%. In the same way, the R2’s influent was 20mg/L, but the effluent was 4-6mg/L, the removal rate was 75%-85%. In the same time, two reactors’s COD removal rate were above 95%. So, we consider the condition which pH was 8.0 is better than the pH was 7.0 to sustain the operate of phosphorus removal.After confirm the best condition of SBR, the researcher studied the effect of VFAs on the performance of phosphorus removal, and the path of biochemistry were also studied. Two reactor’s pH was in the rang of 7.5~8.5. Two typical substrates of acetate and propionate were, respectively, fed to R1 and R2 qua the sole carbon source. Two reactors operate by the mode that aerobic(4h), deposit(0.5h), settling(7.5h). After two reactors operate smoothly, the R1’s influent of phosphorus was 20mg/L and effluent was under 6-7mg/L, the removal rate was 65%-75%. After the settling phase, phosphorus release was 0.5mg/L. the R2’s influent of phosphorus was 20mg/L and effluent was under 2-3mg/L, the removal rate was above 85%. After the settling phase, phosphorus release was 3mg/L. Two reactors’s effect of COD removal were high, the removal rate was above 95%.The energy storage in R1 was PHA, but in R2 was glycogen, they were accumulated when external carbon source was comsumed and the phosphorus’s decrease was not obvious. The phosphorus decrease fleetly when the endogenous carbon source was comsumed. Because the biochemistry processes of the microorganisms were different, the system of R2 need more energy than R1. That’s the reason why the polyphosphate plays a very important role in the biochemistry processes. The microorganisms need energy to maintain in the long-time settling phase.更多还原