The direct discharge of urine into water bodies leads to environmental pollution, and an increase in the water treatment cost, whereas recycling of the nutrients in urine is of significant economic value. A single-compartment reactor was investigated for the recycling of phosphate and simultaneous removal of nitrogen from urine wastewater by electrochemical magnesium induction, and electrochemical oxidation for the removal of residual nitrogen from the supernatant. The results demonstrated that phosphate recovery capacity was greater than 11 mg P cm-2 h-1 at a current density of 15 m A cm-2 and anodizing time of 20 min; the removal rates of ammonium and total nitrogen in the synchronous electrochemical oxidation were 80% and 75%, respectively, at a current density of 45 m A cm-2 and anodizing time of 60 min. The anodizing time and initial pH were determined to be critical control factors in the electrochemical struvite induction and nitrogen electrochemical oxidation. The on-site electrochemical nitrogen oxidation could rapidly utilize the alkaline supernatant following phosphate recovery. Thus, the integration of the single-compartment reactor, electrochemical magnesium dosage, and simultaneous nitrogen electrochemical oxidation demonstrates potential for application to decentralized reactors to treat source-separated urine.

中文翻译：

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通过电化学诱导的鸟粪石沉淀回收磷酸盐并从尿液中同时去除氮。

尿液直接排入水体会导致环境污染，并增加水处理成本，而尿液中养分的循环利用具有重要的经济价值。研究了一个单室反应器，用于回收磷酸盐，并通过电化学镁诱导同时从尿液废水中除去氮，并通过电化学氧化从上清液中除去残留的氮。结果表明，在15 m A cm-2的电流密度和20分钟的阳极氧化时间下，磷酸盐的回收能力大于11 mg P cm-2 h-1。在45 m A cm-2的电流密度和60 min的阳极氧化时间下，同步电化学氧化中氨和总氮的去除率分别为80％和75％。确定阳极氧化时间和初始pH是在鸟粪石电化学感应和氮电化学氧化中的关键控制因素。磷酸盐回收后，现场电化学氮氧化可快速利用碱性上清液。因此，单室反应器，电化学镁剂量以及同时进行的氮电化学氧化的整合证明了其可应用于分散反应器以处理源分离尿液的潜力。