【作者】 杨东明；

【导师】 费庆志；

【作者基本信息】 大连交通大学 ， 环境科学， 2008， 硕士

【摘要】 在众多对生活污水低成本处理工艺的研究中,跌水曝气由于其设备简单,处理费用低而备受关注。本实验研究的自充氧多层生物接触氧化工艺(self-aerated multilayer bio-contact oxidation process)就是利用跌水曝气充氧与生物接触氧化法相结合的一种中、低浓度生活污水处理工艺,并通过出水回流来增加溶解氧效果,而可使跌水曝气适用于更多水质情况。本试验应用自主研制的自充氧多层生物接触氧化反应器对模拟生活污水处理的情况进行了研究,主要研究的内容有:比较两种不同布水装置探讨布水均匀性对处理效果的影响;使实验装置在连续、间歇两种方式下运行探讨运行方式对处理效果的影响;分别选用组合填料和弹性立体填料,探讨适用于跌水曝气工艺的填料应具备的特性;确定回流流量对处理效果的影响。通过以上工作,得出如下结论:在反应器启动挂膜阶段,自然挂膜法虽挂膜时间长,但不易在反应器内沉积污泥更适用于跌水曝气工艺的挂膜启动;增加布水装置的开孔数目,不仅可以增加布水的均匀性还可提高溶解氧效果;回流流量增大有利于增加溶解氧及提高处理效果,但对COD、氨氮的作用在连续运行时各不相同,在300L/h以上回流流量时使COD处理效果提高很小,但对的氨氮处理效果提高作用很大;反应器在连续运行时的处理效果好于间歇运行效果,在填充组合填料时连续运行下在回流量为400L/h,停留时间8小时,处理出水COD、氨氮均可达排放标准,而间歇运行相同条件下出水氨氮较高;在填料选择上,适用于跌水曝气工艺的填料不但要具有较大的比表面积,更重要的是应使生物膜在反应器内分布均匀,这样更有利于氧气、污染物与生物膜之间的传质过程,相近条件下较组合填料可得到更好的出水水质。当反应器填充弹性立体填料,连续运行回流量为400L/h,停留时间6小时出水就可达到中水标准。更多还原

【Abstract】 Among many research of sewage treatment process with lower cost, the drop aeration is drawing due to its simple devices and lower treatment cost. The self-aerated multilayer bio-contact oxidation process tested herein is used to treat mid-low concentration sewage by the drop aeration oxygenation combating with biological contact oxidation, effluent recycling buildup to increase dissolved oxygen content and make drop aeration in application of more water quality. The test on self-oxidation contact filter independently developed to simulate sewage treatment and the main contents of research: to discuss the influences on the treatment effect by comparing with the two water distributing devices; to discuss the influence on the treatment effect under intermittent and continuous operation separately; to determine which filler is conditioned in application of drop aeration process, combined filler and elastic solid filler; to determine the recycling flow’s influences on the treatment effect. Based on the above, the conclusions are as follows:Films grow slowly in filter in natural method at the beginning of biofilm culturing, and sludge deposit is not easy so it can be applied in the process of drop aeration; increasing the numbers of holes on water distributing devices will improve the distributing uniformity and dissolved oxidation effect: the recycling flow increase will benefit dissolved oxidation increase to improve the treatment effect, but it will have an different treatment effect on COD, NH3-N in continue operation. It will not improve the treatment effect on COD greatly when recycling flow is at 300L/h or greater, but it can greatly improve the treatment on NH3-N; the treatment effect in continue operation is better than that in intermittent operation. The filler is filled with combined fillers tested and operates continually, with recycling flow at 400L/h and HRT 8h, the concentration of COD and NH3-N in effluent meet the discharge standard, but the concentration of NH3-N is higher in intermittent operation; the fillers to be selected in application in the drop aeration process need to have larger specific surface area. The most important is to have biofilms distributed in filter uniformly. This will benefit the mass transfer process of oxygen, pollutants and biofilms.更多还原