光助/H_2O_2/草酸铁处理垃圾渗滤液

THE TREATMENT OF LANDFILL LEACH BY LIGHT/H_2O_2/FERRIC OXALATE

利用光助 /H2O2 /草酸铁处理已经过生化处理的垃圾渗滤液(CODcr=450mg/L左右)时,采用 365nm、125W的UV灯照射下,光强为Iu=2. 9mW/cm2 时,反应较佳条件是pH值 =4. 0左右及总药剂用量为 1. 4% (体积比)。草酸铁的用量要适当,投加量过少,混凝效果较差,有效光子不能完全转化为化学能,处理效果不理想;投加量过多,溶液形成棕色浑浊,使紫外光的吸收降低,造成光散射,降低反应速度。而H2O2 的投加量过多,将使铁的络合物更加稳定,H2O2 的分解速率受到限制,投加量过少,效果也会降低。当总药剂用量为 1. 4% (体积比,其中30%过氧化氢 0. 6%, 0. 1mol/L草酸铁溶液 0. 8% )时,反应 30min后,CODcr去除率可达 80%左右,脱色率可达90%以上。

The treatment of landfill leach which had been acclimated (CODcr=450 mg/L around) by using 365 nmUV/ [H_2O_2]/ferric oxalate has been studied. The result indicate that the optimum conditions for the reaction are pH=4.0 around and the total dosage is 1.4% (the volume ratio).The added quantity of ferric oxalate must be properly. Insufficient ferric oxalate has disadvantageous efficiency turns lower and the useable photon cannot be completely transformed into chemical energy. On the other hand , excessive ferric oxalate can cause brown turbid ness to be given in the solution . The Absorption efficiency of UV turns lower because a great deal of photo has been reflected and lost . Excessive hydrogen peroxide can make its decomposing rate decrease and the stability of complex ferric ion increase . But insufficient hydrogen peroxide has also strong disadvantageous effects on the reaction rate . The removal percentages of CODcr and chromaticity for the infiltration wastewater are respectively around 80% and over 90% after the reaction has been run 30 min in which the percentage of the total dosage is 1.4% (the volume ratio) .