【作者】 杜馨；

【导师】 张可方；

【作者基本信息】 广州大学 ， 市政工程， 2007， 硕士

【摘要】 随着水环境污染和水质富营养化问题的尖锐化以及人们公共环境意识的日益增强,迫使污水排放标准中对氮的要求越来越严格。污水处理技术逐渐地从以单一去除有机物为目的的阶段进入既要去除有机物,又要脱氮的深度处理阶段。课题以序批式活性污泥反应器(SBR)为主体,以人工配制的城市污水为处理对象,研究同步硝化反硝化脱氮新技术。对影响同步硝化反硝化的各种因素进行了详细研究,并对同步硝化反硝化生物脱氮机理进行了探讨,确定了试验条件下实现同步硝化反硝化的最佳运行工况。试验结果表明:在SBR反应器内,通过对活性污泥进行约1个月的培养和驯化,使其具有了良好的同步硝化反硝化性能,在最佳运行工况下,即控制反应器内活性污泥微生物的污泥龄为17~25天,维持污泥浓度在5000mg/L左右,以啤酒+淀粉混合物为碳源,pH控制在7.5~8.0的条件下,控制反应器内DO在0.5~1.5mg/L之间,对于进水氨氮浓度在22.1~28.6mg/L之间,总氮浓度为30.0mg/L左右,COD浓度为200mg/L左右的模拟城市污水,曝气运行5h后,出水COD、氨氮、硝酸盐氮和亚硝酸盐氮的浓度分别为20.0mg/L、0.5mg/L、5.0mg/L和0.3mg/L以下,出水COD去除率在90%以上,总氮去除率在81%~94%之间。本文还对稳定运行中SND脱氮性能、DO、ORP和pH的变化规律做以考察。通过对反应过程的分析,得出本试验发生SND的作用机理是微环境理论和生物学理论。更多还原

【Abstract】 The standard of nitrogen removal in wastewater discharge was controlled more and more strictly with severe water pollution and eutrophication question occurred and the sense of environmental protection enhanced. The wastewater techniques developed gradually from the period of pure COD removal to the period of simultaneous COD and nitrogen removal.The experiment about SND was carried out operated with artificial municipal wastewater by sequencing batch reacter (SBR). Some factors that effect SND were studied particularly.The mechanism of SND was studied too. Simultaneously the best operation mode with SND was figured out in the lab.The results show that the efficiency of SND by sludge can be enhanced cultured for one month in SBR. The best operation mode is to controll DO about 0.5~1.5mg/L, SRT about 17~25d, MLSS about 5000mg/L, the mixture of beer and starchy is used as carbon source of SND and pH about 7.5~8.0. Under the best operation mode, the artificial municipal wastewater with about 22.1~28.6mg/L of NH4+-N, about 30.0mg/L of TN, about 200mg/L of COD was treated by operating aerobic process for 5h, with COD, NH4+-N, NO3--N and NO2--N of 20.0mg/L、0.5mg/L、5.0mg/L and 0.3mg/L below in the effluent, the removal rate of COD is 90% above , the removal rate of TN is 81%~94% .The experiment also studied the character of SND by sludge and the variation of DO,ORP and pH. By analyzing the reaction process of SND, the main mechanism of SND in the experiment is the theory of microenvironment and biology.更多还原