垃圾渗滤液预处理铁-镁-铝无机复合絮凝剂的制备

PREPARATION OF Fe-Mg-Al COMPOSITE FLOCCULANT FOR PRETREATMENT OF LANDFILL LEACHATE

为了开发适用于垃圾渗滤液预处理的新型高效铁-镁-铝无机复合絮凝剂(PFMAS),以垃圾渗滤液的COD去除率为主要考察指标,分别从铁镁铝3种盐的配制浓度、3种元素的摩尔比、熟化时间、熟化温度、投药量等方面对絮凝剂的制备及应用条件进行一系列优化研究。通过对某垃圾填埋场渗滤液进行预处理的试验结果表明,PFMAS的最优配方制备条件为nFe(Ⅲ)∶nMg(Ⅱ)∶nAl(Ⅲ)=5∶0.35∶0.5、熟化温度为50℃、熟化时间为0.5 h,对垃圾渗滤液预处理COD去除率可达60%以上。PFMAS是通过—OH基键合形成的具有长链晶形结构的无机高分子铁镁铝共聚物。

In order to get optimal preparation conditions of Fe-Mg-Al composite flocculant(PFMAS) for pretreatment of landfill leachate,COD removals of landfill leachate were optimaized by jar test from concentration of raw FeSO_4,MgSO_4 and Al_2(SO_4)_3,mole ratio of three salts,aging temperature, aging time and dosage.The experimental results of a landfill leachate indicated that the optimal preparation conditions of PFMAS were as below: nFe(Ⅲ)∶nMg(Ⅱ)∶ nAl(Ⅲ)=5∶0.35∶0.5,aging temperature=50 ℃ and aging time=0.5 h.After pretreatment by PFMAS,COD removal could reach over 60%.PFMAS is a kind of inorganic macromolecular copolymer of Fe(Ⅲ),Mg(Ⅱ) and Al(Ⅲ),with long macromolecular chains and macrocosmic crystal structure.