储存尿液电化学法脱氮的影响因素

doi:10.7523/j.issn.2095-6134.2015.05.005

中国科学院大学学报 ›› 2015, Vol. 32 ›› Issue (5): 605-611.DOI: 10.7523/j.issn.2095-6134.2015.05.005

储存尿液电化学法脱氮的影响因素

臧海兴, 胡正义, 刘小宁, 温国期

中国科学院大学, 北京 100049

收稿日期:2014-09-22 修回日期:2015-03-23 发布日期:2015-09-15
通讯作者: 胡正义
基金资助:
国家科技支撑计划项目(2012BAJ24B06-2B)资助

Influence factors of electrochemical removal of nitrogen from stored urine

ZANG Haixing, HU Zhengyi, LIU Xiaoning, WEN Guoqi

University of Chinese Academy of Sciences, Beijing 100049, China

Received:2014-09-22 Revised:2015-03-23 Published:2015-09-15

摘要/Abstract

摘要：

生活污水中约 80% 的氨氮来自尿液,收集尿液并脱氮处理可极大减轻生活污水处理负荷.本实验用Ti/RuO₂-TiO₂ 电极作为阳极,不锈钢板作为阴极,在有机玻璃电解槽中研究考察电流密度(20~100 mA/cm²)、储存尿液初始 pH(9~12) 以及 NaCl 投加量(4~16 g/L) 对储存尿液(250 mL)的脱氮效果.结果表明,最佳脱氮工艺参数为:电流密度 80 mA/cm², 初始 pH 在 11 左右,NaCl 投加量为 8 g/L,电解时间达到 270 min.在此最优化条件下,氨氮和总氮的去除率分别是91.83%和88.34%;处理 1 L 尿液消耗 0.311 kW·h 电能.可见,该方法具有快速、低能耗、高效优点,在源分离尿液氮处理方面具有应用前景.

关键词: 电化学法, 储存尿液, 脱氮, 电流密度, 初始pH, NaCl投加量

Abstract:

About 80% of ammonia in municipal wastewater comes from urine. In the present study, Ti/RuO₂-TiO₂ anode and stainless steel cathode were used in the nitrogen removal process of stored urine. The operating variables in the electrochemical nitrogen removal including the current density (20-100 mA/cm²), initial pH (9-12), and sodium chloride dosage (4-16 g/L) were considered to be the influence factors on the nitrogen removal. The the most effective electrochemical process was observed when utilizing a current density at about 80 mA/cm², initial pH at about 11, and sodium chloride dosage at about 8 g/L. Under the optimum conditions the removal rates of ammonia and total nitrogen were 91.83% and 88.34%,erspectively, and the reaction time was 270 min. A total of 0.311 kW·h energy was consumed for treating 1 L of stored urine. This process was rapid and efficient with low cost, and it would have promising applications in removal of nitrogen in stored urine.

Key words: electrochemical, stored urine, nitrogen removal, current density, initial pH, NaCl dosage

中图分类号:

X703.1

臧海兴, 胡正义, 刘小宁, 温国期. 储存尿液电化学法脱氮的影响因素[J]. 中国科学院大学学报, 2015, 32(5): 605-611.

ZANG Haixing, HU Zhengyi, LIU Xiaoning, WEN Guoqi. Influence factors of electrochemical removal of nitrogen from stored urine[J]. , 2015, 32(5): 605-611.

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储存尿液电化学法脱氮的影响因素

Influence factors of electrochemical removal of nitrogen from stored urine

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