改性沸石填充电化学反应器处理生活污水中氨氮的试验研究

Experimental study on using modified zeolite filled electrochemical reactor to treat ammoniacal nitrogen in domestic sewage

利用改性沸石填充电化学反应器对30 mg/L的模拟生活氨氮污水进行处理试验研究,考察了电流密度、氯离子浓度和初始pH对该反应器处理氨氮污水的影响,并对各因素下反应器处理低浓度氨氮污水的反应结果进行了探讨与分析。结果表明,在电流密度为13.19 mA/cm^(2)、初始pH为7.89、氯氮比为6.2时,其氨氮的去除率可达到96.71%;各因素交互作用对于该体系下氨氮去除效果影响大小为:电流密度&氯氮比>电流密度&pH>氯氮比&pH。

An electrochemical reactor filled with modified zeolite is used to conduct an experimental study on treating with 30 mg·L^(-1) of simulated ammoniacal nitrogen-containing domestic sewage.The effects of current density,chloride ion concentration,initial pH and electrode spacing on the performance of the reactor in treating with ammoniacal nitrogen-containing sewage are investigated.The reaction results for treating with low-concentration ammoniacal nitrogen-containing sewage by the reactor under various factors are discussed and analyzed.The optimal operation conditions of the reactor are determined by response surface analysis as follows:current density is 13.19 mA·cm^(-2),initial pH is 7.89,and the ratio of chlorine to nitrogen is 6.2.Under the optimal conditions,the removal rate of ammoniacal nitrogen can reach 96.71%.Under the interaction of various factors,current density&chlorine-nitrogen ratio exhibits the largest impact on the removal effect of ammoniacal nitrogen,followed by current density&pH,and chlorine-nitrogen ratio&pH shows the smallest impact.