摘要
为了确定高级氧化与生化处理组合工艺对垃圾渗滤液反渗透浓缩液的处理效果及优化运行参数,以辽宁省某垃圾填埋场浓缩液为原水,采用混凝/电化学氧化/曝气生物滤池(BAF)组合工艺进行深度处理。组合工艺在每个环节进行因素控制后,选用最优条件的运行方式进行连续流试验,考察了混凝剂种类和投加量、pH值、助凝剂投加量、电流密度、极板间距对COD、UV_(254)和氨氮去除效果的影响。结果显示:考虑COD、UV_(254)以及氨氮的去除效果,聚合硫酸铁去除效果优于聚合氯化铝和三氯化铁,增加电流密度有助于强化有机物污染的去除效率。得到总体运行优化参数为:在聚合硫酸铁投加量为2200 mg·L^(-1),电流密度为10 A,极板间距为3 cm,BAF的水力停留时间为12 h。优化条件运行时,COD平均去除率为90%,UV_(254)平均去除率为91%,氨氮的平均去除率为98%。
In order to determine the treatment effect of the combined process of advanced oxidation and biochemical treatment on the reverse osmosis(RO)concentrate of landfill leachate and optimize the operating parameters,the concentrate of a landfill in Liaoning Province was used as raw water,coagulation/electrochemical oxidation/biological aerated filter(BAF)combined process was adopted for advanced treatment.After controlling the factors of the combined process in each link,the optimal operating mode was selected for continuous flow test.The influence of the type and dosage of coagulant,pH value,dosage of coagulant aid,current density,and electrode spacing on the removal effect of COD,UV_(254) and ammonia nitrogen was investigated.The results showed that,considering the removal effect of COD,UV_(254) and ammonia nitrogen,the removal effect of polyferric sulfate was better than polyaluminum chloride and ferric chloride.Increasing the current density helped to strengthen the removal efficiency of organic pollution.The overall operating optimization parameters were as follows:the dosage of polyferric sulfate was 2200 mg·L^(-1),the current density was 10 A,the distance between the plates was 3 cm,the hydraulic retention time of BAF was 12 h.Under the optimized conditions,the average COD removal rate was 90%,the average removal rate of UV_(254) was 91%,and the average removal rate of ammonia nitrogen was 98%.
作者
张苧文
杨雨桐
ZHANG Ning-wen;YANG Yu-tong(Shenyang Jianzhu University,Shenyang Liaoning 110170,China)
出处
《辽宁化工》
CAS
2022年第12期1701-1703,1710,共4页
Liaoning Chemical Industry
关键词
垃圾渗滤液
反渗透浓缩液
混凝
电化学氧化
曝气生物滤池
Landfill leachate
Reverse osmosis concentrate
Coagulation
Electrochemical oxidation
Biological aerated filter