UV/H_2O_2/草酸铁处理垃圾渗滤液的研究

A Study on the Treatment of Landfill Leach by UV/H_2O_2/Ferric Oxalate

利用UV(125W) H2O2 草酸铁处理已经过生化处理的垃圾渗滤液(CODCr为450mg L)时,反应较佳条件是pH值为4 0及总药剂用量为14mL L。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,溶液形成棕色混浊,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14mL L(其中30%过氧化氢6mL L,0 1mol L草酸铁溶液8mL L)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(CODCr=450 mg/L)by using UV/H2O2/ferric oxalate was studied.The result indicates that the optimum conditions for the reaction are pH of around 4.0 and total dosage of 14 mL/L.The added quantity of ferric oxalate must be properly.Insufficient ferric oxalate has disadvantageous efficiency and the useable photon cannot be completely transformed into chemical energy.On the other hand,excessive ferric oxalate can cause brown turbidity to be given in the solution.The absorption efficiency of UV turns lower because a great deal of photon has been reflected and lost.Excessive hydrogen peroxide can make its decomposing rate decrease and the stability of complex ferric ion increases.But insufficient hydrogen peroxide has also strong disadvantageous effects on the reaction rate.The removal percentages of CODCr and chromaticity for the infiltration wastewater are respectively around 80% and over 90% after the reaction has been run for 30 min in which the total dosage is 14 mL/L(including 30% H2O2 6 mL/L and 0.1 mol/L ferric oxalate 8 mL/L).