含三唑磷农药废水的光降解研究

On the Photolysis of Triazophos in Water

对含三唑磷废水光氧化降解的可行性研究表明,直接光解可有效提高含三唑磷水样的可生化性,经6h光照后,水样的BOD5/COD由0.22提高到0.70;添加H2O2对光解效果有一定改善作用,投加量达到75mg/L时,水样的COD去除率由零投加时的20%提高到40%,但过量投加对处理效果没有进一步促进作用.同时比较了在曝气和不曝气两种条件下采用UV,UV/H2O2,UV/Fenton,UV/类Fenton等4种工艺对三唑磷废水的处理情况.结果表明,UV/H2O2,UV/Fenton,UV/类Fenton工艺较单纯UV工艺对水样的COD去除效果有显著提高;曝气能促进光解效果,特别对UV/Fenton工艺作用更为显著,光解水样2h后,曝气条件下的COD去除率可从不曝气条件下的30%提高到80%.

The study of the feasibility of photolysis of triazophos wastewater showed that direct UV photolysis could enhance the biodegradability of triazophos efficient.After 6 h of irradiation,the value of BOD5/COD was increased from 0.22 to 0.70.Adding H2O2 in the process improved the photolysis of triazophos.COD removal rate of triazophos wastewater increased from 20% (without adding H2O2 ) to 40% (with 75 mg/L of H2O2 ),but improved no more with excessive amount of H2O2 added to.The comparison of COD removal rate of triazophos wastewater by four different technicses,i.e.UV,UV/H2O2,UV/Fenton and UV/like Fenton system was investigated under the condition of aeration and wihout aeration.The photolysis of triazophos by UV/H2O2,UV/Fenton and UV/like Fenton process were more efficient than UV system.Aeration benefited to the photolysis of triazophos,especially the system with UV/Fenton process,COD removal rate increased from 30% (without aeration) to 80% (with aeration) after 2 h of treatment.