论文部分内容阅读
采用纳米Fe3O4与聚合氯化铝(PAC)复配制备磁性复合絮凝剂MFPAC,利用MFPAC强化混凝-改性矿化垃圾吸附处理垃圾渗滤液.结果表明,MFPAC中适宜的前驱物质量比为m(Fe3O4)∶m(PAC) =1∶3,正交实验结果表明,m(Fe3O4)∶m(PAC)以及投药量对混凝效果有较为显著的影响,pH和沉淀时间对去除效果影响相对较小,MFPAC对COD和色度的去除效果均优于单独投加PAC,投加量为1.5 g/L时,COD和色度去除率分别达到62.6％和66.5％;采用焙烧法对矿化垃圾进行改性,利用改性矿化垃圾吸附MFPAC混凝出水,在焙烧温度为700℃,吸附剂投加量为40 mg/L的条件下,COD和氨氮的去除率分别为56.7％和68.4％;MFPAC混凝-矿化垃圾吸附联合工艺对垃圾渗滤液COD、色度和氨氮的去除率分别为83.8％、78.5％和74.3％.“,”A novel magnetic composite coagulant,MFPAC,is prepared from Fe3O4 nanoparticles and polyferric chloride(PAC).Landfill leachate is pretreated by MFPAC coagulation combined with modified aged-refuse adsorption.It is found that suitable mass ratio of precursor materials in MFPAC is 1 ∶ 3 of m (Fe3O4) ∶ m (PAC).The orthogonal experiment results show that m (Fe3O4) ∶ m (PAC) and coagulant dosage have marked effects on the coagulation performance,while pH value and settling time have a relatively smaller effect.Higher COD and color removals are achieved by using the MFPAC magnetic coagulant than by adding PAC alone.At the dosage of 1.5 g/L,the removal rates of COD and color reach up to 62.6％ and 66.5％,respectively,in coagulation process.Then,the effluent of MFPAC coagulation is further treated by using the modified-aged-refuse adsorption,which leads to 56.7％ and 68.4％ of the COD and ammonia nitrogen removal rates,respectively,at 700 ℃ of roasting temperature and with 40 mg/L of adsorbent.In contrast,by using the combined process,the removal rates of COD,color and ammonia nitrogen removal rates are 83.8％,78.5％,and 74.3％,respectively.