多级强化地下水修复技术去除氨氮试验研究

发布时间：2018-02-27 14:37

本文关键词： MET 氨氮地下水模型　出处：《东华理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：为解决渗透性反应墙和抽出处理法投资大、工程难改动等问题,发明并设计一种将物理化学、生物修复和植物修复有机结合的新型地下水污染修复技术,并命名为MET(Multi-layer Enhance groundwater remediation Technology,多级强化地下水修复技术)。为研究MET对地下水污染物去除情况,选择地下水氨氮为目标污染物,搭建MET小试试验装置,研究MET对模拟污染地下水和实际污染地下水中氨氮的去除机理及效果,并分析MET去除地下水氨氮过程中氮转化情况,构建氮变量以及氮变量影响因素的MET氮素转化模型,在此基础上,通过MET野外现场工程试验进一步验证MET去除地下水中氨氮机理及效果。研究结论如下:(1)通过MET小试试验的研究,表明模拟污染地下水在进水水力负荷为14.68m3/(m2·d)、氨氮浓度为25mg/L和连续运行45d的条件下,氨氮总去除率在92%以上;实际污染地下水在进水水力负荷为6.18~8.10m3/(m2·d)、氨氮浓度10.53~13.79mg/L和连续运行37d的条件下总去除率在72%以上。同时研究结果表明MET沸石在吸附氨氮基础上,与陶粒共同作为微生物繁殖的附着载体,极大地提高了硝化细菌去除地下水氨氮的效果。(2)通过分析MET去除地下水氨氮过程中氮转化情况,构建MET氮素转化模型,并对MET小试数据拟合,求取了氮素转化模型中未知参数,采用Estonia Constructed Wetland的试验数据对氮素转化模型进行验证,验证结果为氮素转化模型预测值与实测值结果接近,一定程度上表明构建的氮素转化模型可用于MET技术长期处理地下水中氮去除效果的预测。(3)MET现场工程试验在小试获取的成果基础上,利用沸石对氨氮吸附方法去除地下水氨氮污染,试验结果表明去除率在74%以上,并分析了进出水“三氮”浓度、DO、ORP、p H和电导率的变化规律,验证微生物硝化作用的存在,初步肯定MET用于实际去除地下水氨氮的效果。
[Abstract]:In order to solve the problems of high investment in permeable reactive wall and extraction treatment method, and difficult to change in engineering, a new type of groundwater pollution remediation technology combining physical chemistry, bioremediation and phytoremediation was invented and designed. And named MET(Multi-layer Enhance groundwater remediation technology, multilevel enhanced groundwater remediation technology. In order to study the removal of groundwater pollutants by MET, the ammonia nitrogen of groundwater was selected as the target pollutant, and the MET experimental equipment was built. This paper studies the mechanism and effect of MET on ammonia nitrogen removal from simulated polluted groundwater and actual polluted groundwater, analyzes the nitrogen conversion in the process of MET removal of groundwater ammonia nitrogen, and constructs a MET nitrogen conversion model of nitrogen variable and its influencing factors. On this basis, the mechanism and effect of MET removal of ammonia nitrogen in groundwater are further verified by MET field engineering experiments. The conclusions are as follows: 1) through the small scale test of MET, The results show that the total removal rate of ammonia nitrogen is more than 92% under the condition of hydraulic load of 14.68 m3 / m ~ 2 路dL, concentration of 25 mg / L ammonia nitrogen and continuous operation for 45 days. The total removal rate of actual polluted groundwater was above 72% under the conditions of hydraulic loading of 6.18o8.10m3 / m3 / m2 路dL, ammonia nitrogen concentration of 10.53g / L 13.79mg / L and continuous operation of 37d. The results also showed that MET zeolites were adsorbed on the basis of ammonia nitrogen. The effect of nitrifying bacteria on the removal of ammonia nitrogen from groundwater was greatly improved by using ceramsite as the attachment carrier of microbial reproduction. By analyzing the nitrogen transformation in the process of MET removal of groundwater ammonia nitrogen, a MET nitrogen transformation model was constructed. The unknown parameters in the nitrogen conversion model were obtained by fitting the data of the MET experiment. The model was verified by the experimental data of Estonia Constructed Wetland. The results showed that the predicted value of the model was close to the measured value. It is indicated to some extent that the nitrogen conversion model can be used to predict the nitrogen removal effect of long-term treatment of groundwater by MET technology. The ammonia nitrogen pollution of groundwater was removed by zeolite adsorption method. The results showed that the removal rate was more than 74%. The variation law of "three nitrogen" concentration and electrical conductivity were analyzed to verify the existence of microbial nitrification. The effect of MET on the removal of ammonia nitrogen from groundwater was preliminarily confirmed.
【学位授予单位】：东华理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X523

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