摘要
针对养殖循环海水处理中,对氨氮和亚硝氮要求极严格,传统单一的生物法难以满足需求的问题,采用双室电解池通过电氧化法高效处理模拟养殖循环水。结果表明,不同阳极电势(1.0、1.2、1.4 V vs.SCE)下,电解3 h后1.4 V产生活性氯含量最高(Cl2的质量浓度1.9 mg/L)。出水NO_(2)^(-)-N含量均较低,自电解0.5 h起,质量浓度分别低于3、3、22μg/L。当阳极电势为1.0 V时直接和间接氧化均被抑制;1.2 V时去除NH_(4)^(+)-N主要机制为阳极直接和间接氧化,1.4 V时主要为阳极间接氧化。阳极电势1.4 V时处理效果为佳,电解3 h后,NH_(4)^(+)-N去除率最高(98.4%),氮元素转化NO_(3)^(-)-N比例最高(12.9%),TN去除率最高(84.4%),且残余活性氯含量符合实用性要求。
Aimed at the recirculating seawater treatment of Recirculating Aquaculture System(RAS), the requirements for ammonia nitrogen and nitrite removal are very strict, and it is difficult for traditional biological treatment to meet the demand. The simulated recirculating aquaculture was efficiently treated by an electro-oxidation method using a two-chamber electrolytic cell. The results showed that, 1.4 V after electrolysis 3 h produced the highest reactive chlorine content(Cl2 mass concentration was 1.9 mg/L) under different anode potentials(1.0, 1.2, 1.4 V vs. SCE). The effluent NO_(2)^(-)-N content was lower, from 0.5 h of the electrolysis, the mass concentration was below 3, 3, 22 μg/L, respectively. At the anode potential of 1.0 V,the direct and indirect oxidation were both suppressed;at 1.2 V, the dominant NH_(4)^(+)-N removal mechanisms were direct and indirect oxidation;while at 1.4 V the dominant was indirect oxidation by anodic oxidation product active chlorine. The optimum anode potential was 1.4 V, after 3 h of electrolysis, the NH_(4)^(+)-N removal rate was the highest(98.4%), also the nitrogen transfer percentage from ammonia to nitrate(12.9%) and the total nitrogen removal rate(84.4%) was the highest, and the residual reactive chlorine content met practical requirements.
作者
尹延明
高怡菲
李伊晗
王笑楠
宋婧
刘鹰
YIN Yanming;GAO Yifei;LI Yihan;WANG Xiaonan;SONG Jing;LIU Ying(Dalian Ocean University,Dalian 116023,China;Key Laboratory of Environment Controlled Aquaculture,Ministry of Education,Dalian 116023,China;National Marine Environmental Monitoring Center,Dalian 116023,China)
出处
《水处理技术》
CAS
CSCD
北大核心
2021年第6期70-74,79,共6页
Technology of Water Treatment
基金
国家重点研发计划(2019YFD0900500,2019YFD0900501)
辽宁省教育厅科学研究经费项目(QL201906)
广东省海洋牧场规划、建设与管理工程技术研究(GML2019ZD0402)
广东省重点研发计划项目(2019B020215001)。
关键词
电氧化
活性氯
循环水养殖系统
氨氮
electro-oxidation
active chlorine
recirculating aquaculture system
ammonia nitrogen
