电化学氧化法在循环水养殖系统中去除氨氮和亚硝酸盐效果研究  

Studies of the Ammonia and Nitrite Removal by Electrochemical Oxidation in Recirculating Aquaculture System

作　　者：宋协法[1] 边敏[1] 黄志涛[1] 董登攀[1] 

机构地区：[1]中国海洋大学水产学院,山东青岛266003

出　　处：《中国海洋大学学报（自然科学版）》2016年第11期127-135,共9页Periodical of Ocean University of China

基　　金：国家科技支撑计划项目(2011BAD13B04)资助~~

摘　　要：为研究电化学氧化法在循环水养殖系统中用于去除氨氮和亚硝酸盐的可行性,利用有效面积为20和32cm^2两种规格的钌铱电极研究了电流密度、极板间距和氨氮初始浓度对模拟养殖污水中氨氮和亚硝酸盐去除效果的影响。研究表明,当电流密度小于75mA/cm^2时,增加电流密度可以显著提升氨氮和亚硝酸盐的去除率。通过正交实验确定了实验条件下2组电极的最佳反应条件:电流密度62.5mA/cm^2、极板间距1cm、反应时间80s,氨氮初始浓度2.7mg/L。在上述实验条件下,当氨氮去除率达到90%以上时,大、小电极分别需要40和60s的反应时间;当亚硝酸盐去除率达到90%以上时,大、小电极分别需要40和80s的反应时间。在氨氮去除率达到90%时,小电极的平均反应速度为327.24mg/h,能耗为0.093kW·h/t;大电极的平均反应速度为503.82mg/h,能耗为0.114kW·h/t。To determine the possibility of using electrochemical oxidation to remove ammonia and nitrite in recirculating aquaculture system,we carried out this sudsy by using seawater simulated wastewater and two different sizes of Ti/RuO_2-TiO_2-IrO_2 electrodes which have 20 and 32cm2 effective surface,respectively.The electrodes were used to investigate how various experimental conditions determine their effects on the degradation of ammonia and nitrite.The studied included applied current density,inter-electrodes gap and initial ammonia concentration.The results showed that ammonia and nitrite removal rate increased with applied current density within 75mA/cm^2.The optimal experimental condition was 62.5mA/cm^2 of applied current density,1cm inter-electrodes gap,80 sretention time and2.7mg/L of initial ammonia concentration as was established through orthogonal analysis.In order to achieve 90%ammonia removal rate under the optimal condition,the retention time needed for little electrodes was 60 sand the bigger electrodes was 40 s.For the nitrite removal rate over 90%,the retention time needed for little electrodes was 80 sand the bigger electrodes was 40 s.The average elimination of ammonia speed and energy consumption were calculated when ammonia removal rate reached 90% and the average elimination speed and energy consumption of little and bigger electrodes were 327.24mg/h,0.093kW·h/t and 503.82mg/h,0.114kW·h/t,respectively.

关 键 词：电化学氧化法 循环水养殖系统 氨氮 亚硝酸盐 平均反应速度 能耗 

分 类 号：S959[农业科学—水产养殖] S969.38[农业科学—水产科学]