基于新型浸没式膜组件的污水中氨氮富集及机理初探

发布时间：2018-06-20 11:53

本文选题：膜组件 + 氨氮富集　；参考：《水处理技术》2016年12期

【摘要】：将离子交换膜耦合微滤膜开发出一种新型浸没式平板膜组件,以实现废水中NH_4~+-N的分离富集。为探究其富集机理、明确操作条件对NH_4~+-N富集效率的影响,通过改变电流强度、膜出流量、出水抽停比及电极条件,于不同操作条件下考察NH_4~+-N富集效果,根据电化学理论推导富集机理,并通过实验进行分析验证,结果表明:电流强度增大,单位时间内进入膜组件的NH_4~+离子数量增多,富集平衡时间缩短,富集率相应增加;膜出流量为3.0 mL/min时NH_4~+-N富集率达到最佳为75.29%;综合考虑膜组件富集性能及处理水量,确定最佳出水抽停比为10 min:5 min;以铁板为电极时,膜组件NH_4~+-N富集性能依次优于钛电极、不锈钢电极;随电极淹没比的减小,两极板间电场强度增加,NH_4~+离子迁移速率变大,膜组件NH_4~+-N富集率增高。
[Abstract]:An ion exchange membrane coupled microfiltration membrane was developed to develop a new type of submerged plate membrane module to realize the separation and enrichment of NH_4~+-N in the wastewater. In order to explore the enrichment mechanism of the wastewater, the influence of the operating conditions on the enrichment efficiency of the NH_4~+-N was explored. By changing the current intensity, the flow rate of the membrane, the discharge ratio of the effluent and the electrode conditions, the NH_ was investigated under different operating conditions. The enrichment mechanism of 4~+-N enrichment is deduced according to the electrochemical theory, and the results show that the increase of the current intensity, the increase of NH_4~+ ion in the membrane module within a unit time, the shortening of the enrichment balance time and the increase of the enrichment rate, and the optimum concentration of NH_4~+-N when the flow volume of the membrane is 3 mL/min; Considering the enrichment performance of membrane module and the amount of water treated, the optimum pumping rate is 10 min:5 min. When the iron plate is used as the electrode, the enrichment performance of the membrane component NH_4~+-N is superior to the titanium electrode and the stainless steel electrode in turn. With the decrease of the electrode submergence ratio, the electric field strength between the two polar plates increases, the migration rate of NH_4 ~ + increases and the NH_4~+-N enrichment rate of the membrane module increases. High.
【作者单位】：北京工业大学北京市水质科学与水环境恢复工程重点实验室;
【基金】：国家自然科学基金资助项目(51478015) 人才培养质量建设-双培计划新兴专业建设-智能城市的城市污水能源衍生研究
【分类号】：X703

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