荧光增白剂生产废水不同预处理方法的比较

采用Fenton试剂氧化、O3氧化、曝气铁炭微电解3种方法对荧光增白剂生产废水进行了处理,考察了不同影响因素对3种处理方法处理效果的影响.结果表明,在H2O2投加量为0.13 mol/L、H2O2与Fe2+的物质的量比为20、pH值为5.0、反应时间为1.0h时, Fenton试剂氧化处理效果最好,CODCr去除率达到39.9%, BOD5/CODCr提高到0.51.在反应时间为70min(O3通入量为2.51 g/L)、pH值为9.2时,O3氧化处理效果较好,CODCr去除率达到36.7%,BOD5/CODCr提高到0.47.在铁炭质量比为1、反应时间为2.0h、pH值为2.5时,曝气铁炭微电解效果最好,CODCr去除率达到57.1%,BOD5/CODCr提高到0.45.3种预处理方法均可有效降解荧光增白剂生产废水中的有机物并且提高废水的可生化性,其中曝气铁炭微电解的效果最好,处理成本最低,可以应用于荧光增白剂生产废水的处理中.

Comparisons of several pretreatment methods for fluorescent whitening agent wastewater

The fluorescent whitening agent wastewater was pretreated using Fenton’s reagent oxidization, ozone oxidization or aerate ferric-carbon micro-electrolysis method, in which various factors to treatment efficiency of each method were examined. For Fenton’s reagent oxidization under the optimal conditions where H2O2 dosage was 0.13 mol/L, H2O2 to Fe (II) molar ratio was 20, pH was 5.0, and the reaction time was 1.0h, the CODCr removal rate reached to 39.9% and the BOD5/CODCr to 0.51. For ozone oxidization the optimal conditions were: reaction time of 70min (the ozone dosage of 2.51g/L), pH at 9.2, under which the CODCr removal rate reached to 36.7% BOD5/CODCr to 0.47. For aerate ferric-carbon micro-electrolysis method the CODCr removal rate could reach to 57.1% the BOD5/CODCr to 0.45 under the optimal conditions of: iron to carbon weight ratio of 1, reaction time for 2.0h, and pH at 2.5. The organic matters in fluorescent whitening agent wastewater could be removed effectively and the biodegradability could be improved by each method. Comparatively the aerate ferric-carbon micro-electrolysis method had the highest CODCr removal rate and the lowest cost of wastewater treatment, suggesting the promising potential for the treatment of fluorescent whitening agent wastewater.