【作者】 王琪；

【导师】 刘年丰；

【作者基本信息】 华中科技大学 ， 环境工程， 2006， 硕士

【摘要】 旅游区公厕污水水质水量变化幅度较大,在旅游淡季,往往出现经化粪池预处理后的污水由于化学需氧量较低,而不能满足常规A2/O工艺同步脱氮除磷所需碳源水平的问题,以致影响氮磷的去除效果。在借鉴荷兰Delft科技大学Kuba教授研究成果的基础上,提出以培养反硝化除磷菌(DPB)为优势菌种,对常规A2/O工艺进行配合改进的新思路。工艺改进分为三方面,增加中间沉淀池、改变原回流路线的始终端同时增加一条新的回流路线、在好氧段投加软性填料。由于改进工艺形成了双泥体系,达到富集反硝化除磷菌的目的,以解决常规A2/O工艺难以同步高效脱氮除磷的缺陷。本研究开展了相应的实验研究。反硝化除磷菌(DPB)的培养是新工艺的关键。采取了两阶段间歇式的方法,成功地驯化出DPB。静态试验结果:挂膜硝化反应最佳pH值为8.5;COD和硝酸盐氮对DPB的吸磷、释磷有较大影响,吸磷过程COD控制范围以小于30mg/L为宜。对三种进水流量,三种不同污泥回流量进行了动态试验,找到最佳停留时间与污泥回流参数,大幅度提高了氮磷去除率,结果为:进水流量Q为10L/h,污泥回流量为0.3Q时,TP去除率为94.2%,氨氮去除率为93.6%,硝酸盐氮去除率为91.3%。为证明DPB对系统的脱氮除磷是否起到了关键作用,本研究设计并进行了细菌磷含量的检验,结果表明该系统的DPB处于正常工作状态。研究说明,以DPB为优势菌种的改进A2/O新工艺的思路是正确的,方法简易可行,能够在不投放外加碳源、不增加成本的同时,使氮磷的去除率同步达到90%以上的高效水平。更多还原

【Abstract】 The wasterwater quality and quantity of public washrooms vary within a large range and, especially in low season, outflow of pretreatment cannot meet the request of carban resource for denitrification and posphourus removal simultaneously using conventional A2/O process. Because Chemical Oxygen Demand decreases in the septic tank., the effecet of nitrogen and posphourus removal is influenced. Using the research achievement of Pro. T. Kuba of Netherlands Delft University of Technology for reference, the new idea that the Denitrifying Phosphorus removal Bacteria is incubated as dominant bacterias and the conventional A2/O process is improved correspondingly. The improved process consists of adding a settling tank, changing the begin and the end of the old sludge return routine and adding the flexible filling into the oxic tank. This process became a two-sludge system to accumulate the DPB so that it can slove the problem that it is difficult for the convetional A2/O process to arrive the high efficiency of denitrification and posphorus remval. The research develops the relevant experiment.The incubation of DPB is the key for the new process, so the two-stage sequencing approach of incubation is adopted, and DPB is incubated successfully.The result of captive test: The value of pH for the filmed nitrobacteria should be controlled at 8.5; the concentration of COD and NO3- influence the effect of the posphourus take-up and release, the concentration of COD should be controlled below 30 mg/L in the posphourus take-up process.The dynamic test is carried out in the condition of three flux and three different sludge return flux to get the optimal value of HRT and the sludge return. The result indicates that when the inflow Q is 10L/h and the sludge return is 0.3Q, the removal rate of TP is 94.2%, the removal rate of NH4+-N is 93.6%, and the removal rate of NO3--N is 91.3%. The research design and carry out the checking up the posphousrus rate of the bacteria so that it proved that the DPB takes an important role in posphourus removal. The results indicate the DPB is in a natural working status.The research shows that it is correct ,simple and practical for this idea to improved A2/O process based on dominant bacteria of DPB, The removal rate of the nitrogen and posphourus arrive more than 90% in the condtion of neither addition extra carbon resource nor increasing the cost.更多还原