Total organic carbon and total nitrogen removal and simultaneous electricity generation for nitrogen-containing wastewater based on the catalytic reactions of hydroxyl and chlorine radicals
Total organic carbon and total nitrogen removal and simultaneous electricity generation for nitrogen-containing wastewater based on the catalytic reactions of hydroxyl and chlorine radicals
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基于羟基和氯自由基催化反应的含氮废水总有机碳和总氮脱除并同步发电
DOI：
10.1016/j.apcatb.2018.07.036
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发表时间：
2018-12
期刊：
影响因子：
--
通讯作者：
Zhou Baoxue
中科院分区：
文献类型：
--
作者：
Zhang Yan;Li Jinhua;Bai Jing;Li Xiaoyan;Shen Zhaoxi;Xia Ligang;Chen Shuai;Xu Qunjie;Zhou Baoxue
含氮有机废水的处理是一个难题，因为常规的污水处理技术很难同时去除有机物和氮。在这里，我们提出了一种新的方法，有效地去除总有机碳和总氮，并同时发电该废水。设计的核心思想是在自偏压废水燃料电池中同时发电时，有机物和氨氮分别与羟基和氯自由基发生催化反应，转化为二氧化碳和氮气。在对氮气有较高选择性的Pd/Cu修饰泡沫镍电极上还原硝态氮(包括原始和生成的硝态氮)，实现了对水中总氮的完全去除。此外，采用WO_3纳米板阵列电极和硅光伏电池作为混合光阳极，产生了自偏压，以加强电荷分离。该系统还成功地延长了采光时间。对硝态氮(NH4-N)和苯酚进行了一系列的实验，结果表明，在90 min内，硝态氮(NH4-N)的去除效率为98.7%(91.5%)，延长到120 min，总氮可以有效地转化为N2。该系统对苯酚的降解率也很高，在90 分钟内降解率可达99.1%。结合ESR分析和自由基捕获实验，得出氯自由基在苯酚和氨氮氧化中起重要作用的结论。此外，该系统的最大功率密度可达1.2 3 MW cm−2。本研究为含氮有机废水的同时处理和发电提供了一条自给自足的途径。
The treatment of nitrogen-containing organic wastewater is a difficult problem because organic and nitrogen contents are hard to remove simultaneously for the common sewage disposal technologies. Here we propose a new method to efficiently remove total organic carbon and total nitrogen and generate electricity simultaneously for this wastewater. The key idea of design is that organics and ammonia nitrogen is converted into CO2and N2by catalytic reacting with hydroxyl and chlorine radicals, respectively, while generating electricity concurrently in a self-biased wastewater fuel cell. Nitrate-N (including original or generated) was reduced on Pd/Cu modified Ni foam electrode with high selectivity toward N2, realizing the completely removal of total nitrogen from the water. Moreover, self-bias voltage was generated by employing WO3nanoplate array electrodes and silicon photovoltaic cells as a hybrid photoanode to enhance the charge separation. This system was also successful in extending the light harvest. A series of experiments were performed with nitrate-N (ammonium-N) and phenol and the results indicated the removal efficiency of nitrate-N (ammonium-N) was 98.7% (91.5%) in 90 min and total nitrogen was efficiently transformed to N2with extending time to 120 min. The system also showed a superior performance for phenol degradation (99.1% in 90 min). Combined with the analysis of ESR and free radical capture experiment, it was concluded that chlorine radical played an important role in the phenol and ammonia-N oxidation. In addition, maximum power density output of the system reached 1.23 mW cm−2. This study offers a self-sustaining approach for simultaneous nitrogen-containing organic wastewater treatment and electricity production.
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