Paired electrolysis in a solid polymer electrolyte reactor-simultaneously reduction of nitrate and oxidation of ammonia
Paired electrolysis in a solid polymer electrolyte reactor-simultaneously reduction of nitrate and oxidation of ammonia
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DOI：
10.1016/j.cej.2005.02.028
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发表时间：
2005-04-15
影响因子：
15.1
通讯作者：
Christensen, PA
中科院分区：
文献类型：
--
作者：
Cheng, H;Scott, K;Christensen, PA
在零间隙固体聚合物电解质（ZGSPE）反应器中进行了硝酸盐的同时还原和氨的同时氧化，该反应器在间歇式循环模式下恒流运行。在45 h内完全去除16.1 mM硝酸盐和9.4 mM氨，去除率分别为0.057 mol NO3- cm(-2) h（-1）和0.017 mol NH3 cm(-2) h（-1）。在最佳条件下，硝态氮还原过程的时空产率分别为5.4 kg NO3 m(-3) h（-1）和0.17 kg NH3 m(-3) h(-1)，硝态氮还原电流效率为24.5%，氨氧化电流效率为1.4%，硝态氮还原能耗为40.1 kWh (kg NO3-)(-1)，无亚硝酸盐生成，N-2为主要产物。然而，需要提高氨氧化对氮的选择性。考察了反应物浓度、温度和流速对反应的影响。使用ZGSPE反应器可以处理各种含有硝酸盐和氨的废物，包括硝酸盐离子和氨含量极低的废物。(c) 2005 Elsevier B.V.版权所有
Simultaneous reduction of nitrates and oxidation of ammonia in aqueous solutions have been carried out in a zero gap solid polymer electrolyte (ZGSPE) reactor, operated galvanostatically in a batch recycle mode. Complete removal of 16.1 mM nitrate and 9.4 mM ammonia was achieved within 45 h with removal rates of 0.057 mol NO3- cm(-2) h(-1) and 0.017 mol NH3 cm(-2) h(-1). Space-time yields of 5.4 kg NO3 m(-3) h(-1) and 0.17 kg NH3 m(-3) h(-1), current efficiencies for nitrogen formation of 24.5% in the nitrate reduction and 1.4% in the ammonia oxidation and energy consumptions of 40.1 kWh (kg NO3-)(-1) were obtained during nitrate reduction, no nitrite was formed and N-2 was the main product under the best conditions. However, an improvement in the selectivity for the ammonia oxidation towards nitrogen is required. Effects of reactant concentrations, temperature and flow rate have been investigated. Use of the ZGSPE reactor could treat a wide range of wastes containing nitrate and ammonia, including those with very low levels of nitrate ions and ammonia. (c) 2005 Elsevier B.V. All rights reserved.