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Electrochemical simultaneous denitrification and removal of phosphorus from the effluent of a municipal wastewater treatment plant using cheap metal electrodes
Environmental Science: Water Research & Technology ( IF 3.5 ) Pub Date : 2020-02-14 , DOI: 10.1039/d0ew00049c Min Guo 1, 2, 3, 4, 5 , Li Feng 1, 2, 3, 4, 5 , Yongze Liu 1, 2, 3, 4, 5 , Liqiu Zhang 1, 2, 3, 4, 5
Environmental Science: Water Research & Technology ( IF 3.5 ) Pub Date : 2020-02-14 , DOI: 10.1039/d0ew00049c Min Guo 1, 2, 3, 4, 5 , Li Feng 1, 2, 3, 4, 5 , Yongze Liu 1, 2, 3, 4, 5 , Liqiu Zhang 1, 2, 3, 4, 5
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Nitrate and phosphate in the effluent of a municipal wastewater treatment plant (MWTP) were electrochemically removed with cheap metal (aluminum and iron) electrodes. The effects of electric current density, electrode spacing, electrolyte, electrolysis time and electrode material on nitrate and phosphate removal were investigated. The results demonstrated the feasibility of simultaneous removal of nitrate and phosphate by electroreduction and electrocoagulation using an aluminum or iron electrode. The optimum reaction conditions were determined as follows: the electric current density was 8 mA cm−2 and the electrolysis time was 1.5 h. The best removal performance of nitrate and phosphate could be obtained by using an aluminum sheet as a cathode and an anode. Under the above conditions, the removal rate of nitrate and phosphate was 100%, and 85% nitrate was converted to nitrogen gas. The XRD, FTIR and FESEM characterization spectra of the precipitate produced in the electrolytic cell were analyzed, and it was found that the main removal mechanisms of phosphate were the co-precipitation of metal ions, phosphate ions and hydroxide ions in solution and the adsorption of phosphate by hydroxyl metal complexes. Compared with an iron sheet, an aluminum sheet is less consumed in the electrolysis process with the same treatment effect. The electrolysis of actual wastewater was studied to verify the experimental conclusions. This study showed that the total nitrogen concentration in wastewater could be reduced to below 15 mg L−1 by aluminum electrolysis for 1.5 h at 8 mA cm−2. And the ammonia concentration was below 5 mg L−1. In other words, this study provided an economical and efficient alternative method for simultaneous removal of nitrate and phosphorus from the effluent of MWTPs.
中文翻译：
使用廉价的金属电极同时进行反硝化和去除市政废水处理厂废水中的磷
用廉价的金属（铝和铁）电极电化学去除市政污水处理厂（MWTP）废水中的硝酸盐和磷酸盐。研究了电流密度，电极间距，电解质，电解时间和电极材料对硝酸盐和磷酸盐去除的影响。结果证明了使用铝或铁电极通过电还原和电凝同时去除硝酸盐和磷酸盐的可行性。确定最佳反应条件如下：电流密度为8 mA cm -2电解时间为1.5h。通过将铝板用作阴极和阳极，可以获得最佳的硝酸盐和磷酸盐去除性能。在上述条件下，硝酸盐和磷酸盐的去除率为100％，并且85％的硝酸盐转化为氮气。分析了电解池中产生的沉淀物的XRD，FTIR和FESEM表征谱，发现磷酸盐的主要去除机理是溶液中金属离子，磷酸根离子和氢氧根离子的共沉淀以及对金属离子的吸附。由羟基金属络合物形成磷酸盐。与铁板相比，铝板在电解过程中的消耗更少，且具有相同的处理效果。研究了实际废水的电解，以验证实验结论。通过铝电解在8 mA cm -2下-1进行1.5 h。并且氨浓度低于5mg L -1。换句话说，这项研究提供了一种经济有效的替代方法，用于同时从MWTP的废水中去除硝酸盐和磷。
更新日期：2020-02-14
中文翻译：
使用廉价的金属电极同时进行反硝化和去除市政废水处理厂废水中的磷
用廉价的金属（铝和铁）电极电化学去除市政污水处理厂（MWTP）废水中的硝酸盐和磷酸盐。研究了电流密度，电极间距，电解质，电解时间和电极材料对硝酸盐和磷酸盐去除的影响。结果证明了使用铝或铁电极通过电还原和电凝同时去除硝酸盐和磷酸盐的可行性。确定最佳反应条件如下：电流密度为8 mA cm -2电解时间为1.5h。通过将铝板用作阴极和阳极，可以获得最佳的硝酸盐和磷酸盐去除性能。在上述条件下，硝酸盐和磷酸盐的去除率为100％，并且85％的硝酸盐转化为氮气。分析了电解池中产生的沉淀物的XRD，FTIR和FESEM表征谱，发现磷酸盐的主要去除机理是溶液中金属离子，磷酸根离子和氢氧根离子的共沉淀以及对金属离子的吸附。由羟基金属络合物形成磷酸盐。与铁板相比，铝板在电解过程中的消耗更少，且具有相同的处理效果。研究了实际废水的电解，以验证实验结论。通过铝电解在8 mA cm -2下-1进行1.5 h。并且氨浓度低于5mg L -1。换句话说，这项研究提供了一种经济有效的替代方法，用于同时从MWTP的废水中去除硝酸盐和磷。
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