College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China.
College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China.
Sci Total Environ. 2020 Jul 15;726:138221. doi: 10.1016/j.scitotenv.2020.138221. Epub 2020 Mar 26.
Struvite precipitation may become ineffective in removing phosphorus due to the low concentration of phosphate in the liquid. In this study, electrolysis with a magnesium anode was applied to recovering phosphorus and ammonia as struvite from wastewater. A novel electrodialysis process (ED) with a magnesium anode was developed, and its feasibility to treat synthetic wastewater with low phosphate concentration was demonstrated in a pilot-scale experimental system. To achieve high phosphate removal efficiency in the product stream, the optimal initial pH and flow rate were found to be 8.8 and 200 L h, respectively, for the ED system at a constant current of 0.1 A. The pilot-scale ED system under the consecutive batch mode removed 65% phosphate from the synthetic wastewater containning 10 mg LP, and the phosphate concentration in the product stream was kept at 30 mg L after 280 min. The running cost of the ED system was estimated to be $31.27 kg P for synthetic wastewater with 10 mg L P, mainly resulting from the cost of the loss of the magnesium anode. The precipitates generated from the product stream were confirmed as struvite by XRD analysis.
由于液体中磷酸盐浓度低，鸟粪石沉淀可能无法有效去除磷。在这项研究中，应用镁阳极电解从废水中回收磷和氨作为鸟粪石。开发了一种具有镁阳极的新型电渗析工艺（ED），并在中试规模实验系统中证明了其处理低磷浓度合成废水的可行性。为了在产物流中获得高的磷酸盐去除效率，发现对于 ED 系统在恒定电流为 0.1 A 时，最佳初始 pH 值和流速分别为 8.8 和 200 L/h。在连续批处理模式下的中试 ED 系统从含有 10 mg LP 的合成废水中去除了 65%的磷酸盐，并且在 280 min 后产物流中的磷酸盐浓度保持在 30 mg/L 。对于 10 mg/L P 的合成废水，ED 系统的运行成本估计为 31.27 美元/千克 P，主要来自镁阳极损耗的成本。通过 XRD 分析确定产物流中生成的沉淀物为鸟粪石。
