污水地下渗滤系统氨氮、有机氮的去除机理及影响因素研究

发布时间：2019-02-25 17:56

【摘要】：本文以地下渗滤系统为研究对象,构建一套模拟污水地下渗滤系统的连续实验装置,围绕系统的再启动及氨氮、有机氮的去除机理及其影响因素进行研究,为地下渗滤系统强化脱氮技术的研究和关键运行的参数调控提供理论基础,研究结果可指导其在分散生活污水处理中的设计与应用。主要研究成果如下:(1)地下渗滤系统的再启动周期的研究表明:COD的再启动周期为15 d;NH_4~+-N的再启动周期为17d;TP的再启动周期为16 d。该系统的再启动周期应以最长的启动周期为基准,即17 d。再启动完成后NH_4~+-N、COD、TP去除率达83%、80%、90%以上。(2)地下渗滤系统对氨氮的去除机理及影响因素研究结果表明:污水地下渗滤系统中NH_4~+-N去除的最适水力负荷为0.10 m3/(m2·d),最适进水有机物浓度为250-260 mg/L,最适C/N比为3:1,最适干湿比为2:1。此时系统中NH_4~+-N、COD、TP的去除率达90.8%、88.1%、87.7%以上。NH_4~+-N去除过程中,当水力负荷为0.10 m3/(m2·d)时,氨挥发去除的氮占3.5%,硝化-反硝化作用去除的氮量占70.8%,土壤吸附作用去除的氮占16.5%;当进水有机物浓度为250-260 mg/L时,氨挥发去除的氮占3.6%,硝化-反硝化作用去除的氮量占74.3%,土壤吸附作用去除的氮量占15.9%;当C/N比为3:1时,氨挥发去除的氮占5.7%,硝化-反硝化作用去除的氮占71.6%,土壤吸附作用去除的氮占12.6%;干湿比为2:1时,氨挥发去除的氮占4.3%,硝化-反硝化作用去除的氮占69.4%,土壤吸附作用去除的氮占17.6%。(3)地下渗滤系统对有机氮的去除机理及影响因素研究结果表明:污水地下渗滤系统中有机氮去除的最适水力负荷为0.10 m3/(m2·d),最适进水有机物浓度为250-260 mg/L,最适C/N比为3:1,最适干湿比为1:2。此时系统中有机氮、COD、TP的去除率达66.3%、87.9%、89.1%以上。有机氮去除过程中,当水力负荷为0.10 m3/(m2·d)时,氨挥发作用去除的氮占4.2%,硝化-反硝化作用去除的氮占55.2%,土壤吸附作用去除的氮占6.9%;当进水有机物浓度为250-260 mg/L时,氨挥发作用去除的氮占4.2%,硝化-反硝化作用去除的氮占57.8%,土壤吸附作用去除的氮占26.6%;当C/N比3:1时,氨挥发作用去除的氮占4.9%,硝化-反硝化作用去除的氮占50.8%,土壤吸附作用去除的氮占11.0%;干湿比为1:2时,氨挥发作用去除的氮占3.1%,硝化-反硝化作用去除的氮占57.2%,土壤吸附作用去除的氮占9.8%。
[Abstract]:Taking the underground percolation system as the research object, this paper constructs a set of continuous experimental equipment to simulate the underground infiltration system of sewage, and studies the mechanism and influence factors of the restarting of the system, the removal mechanism of ammonia nitrogen, organic nitrogen, and so on. It provides a theoretical basis for the study of enhanced denitrification technology in underground percolation system and the parameter regulation of the key operation. The results of the study can guide the design and application of the technology in the treatment of dispersed domestic sewage. The main results are as follows: (1) the restarting cycle of the underground percolation system shows that the restarting cycle of COD is 15 days, the restart cycle of NH _ 4 ~-N is 17 d ~-N, and the restart cycle of 17 d TP is 16 d. The restart cycle of the system should be based on the longest start-up cycle, that is, 17 d. After the start-up was completed, the removal rate of NH_4~-N, COD, TP was 83%, 80%, (2) the mechanism and influence factors of ammonia nitrogen removal by underground infiltration system were studied. The results show that the optimum hydraulic load of NH_4~-N removal is 0.10m ~ 3 / (m ~ 2 路d),). The optimum concentration of organic matter in the influent is 250 ~ 260 mg/L, the optimum C / N ratio is 3 ~ 1, and the optimum dry / wet ratio is 2 ~ 1. When the hydraulic load is 0.10m3 / (m2 路d), the removal rate of NH_4~-N, COD and TP in the system is 90.8%, 88.1%, 87.7% and more than 87.7%, respectively, when the hydraulic load is 0.10m3 / (m2 路d) in the removal process of NH _ 4 ~-N. Ammonia volatilization nitrogen accounted for 3.5%, nitrification-denitrification nitrogen removal accounted for 70.8%, soil adsorption removal of nitrogen accounted for 16.5%. When the influent organic matter concentration was 250 ~ 260 mg/L, the nitrogen removed by ammonia volatilization, nitrification-denitrification and soil adsorption accounted for 3.6%, 74.3% and 15.9%, respectively. When the C / N ratio was 3: 1, the nitrogen removed by ammonia volatilization accounted for 5.7%, the nitrogen removed by nitrification-denitrification accounted for 71.6%, and the nitrogen removed by soil adsorption accounted for 12.6%. When the ratio of dry to wet was 2: 1, the nitrogen removed by ammonia volatilization and nitrification-denitrification accounted for 4.3% and 69.4%, respectively. The removal of organic nitrogen by soil adsorption accounted for 17.6%. (3) the mechanism of organic nitrogen removal by underground infiltration system and its influencing factors were studied. The results showed that the optimal hydraulic load for organic nitrogen removal was 0 in the underground sewerage system. 10 m3 / (m2 路d),) The optimum influent concentration of organic matter is 250 ~ 260 mg/L, the optimum C / N ratio is 3 ~ 1, and the optimum dry / wet ratio is 1 ~ (2) 路h ~ (- 1). The removal rate of organic nitrogen and COD,TP in the system was 66.3%, 87.9% and 89.1% respectively. When the hydraulic loading was 0.10 m3 / (m2 路d), the nitrogen removed by ammonia volatilization accounted for 4.2%, the nitrogen removed by nitrification-denitrification accounted for 55.2%, and the nitrogen removed by soil adsorption accounted for 6.9%. When the influent organic matter concentration was 250 ~ 260 mg/L, the nitrogen removed by ammonia volatilization accounted for 4.2%, the nitrogen removed by nitrification-denitrification accounted for 57.8%, and the nitrogen removed by soil adsorption accounted for 26.6%. When C / N ratio was 3: 1, the nitrogen removed by ammonia volatilization accounted for 4.9%, the nitrogen removed by nitrification-denitrification accounted for 50.8%, and the nitrogen removed by soil adsorption accounted for 11.0%. When the ratio of dry to wet was 1: 2, the nitrogen removed by ammonia volatilization accounted for 3.1%, the nitrogen removed by nitrification-denitrification accounted for 57.2%, and the nitrogen removed by soil adsorption accounted for 9.8%.
【学位授予单位】：沈阳师范大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X703

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