含悬浮物低放有机废水的处理工艺研究

Study on Treatment Process of Low-Level Organic Wastewater Containing Suspended Matter

针对核工业产生的含悬浮物低放有机废液,本文设计采用微波芬顿-真空抽滤-沸石吸附-离子交换四级组合工艺,实现对废液中的有机物、悬浮物以及核素的深度净化处理。实验结果表明:在反应时间为30 min、pH=6、n(H2O2)=0.03 mol/L以及n(H2O2):n(Fe^2+)=3的最佳条件下,微波芬顿后废液的COD值仅为15.1 mg/L有机物去除率高达95.3%,明显优于活性炭对有机物的去除率;悬浮物在微波芬顿后效作用(絮凝反应)及真空抽滤联合工艺下,获得了优异的净化效果,其SS净化率高达99%以上;Co、Cs、Sr、Fe四种模拟核素经沸石柱吸附后均能在10 min较短时间内达到吸附平衡。其中,Co、Cs、Fe的去除率高达99%以上;离子交换柱对核素的去除效果并不显著,这主要归因于沸石柱对核素高吸附性的贡献。最终,废液经四级处理单元净化后,出水COD、悬浮物、模拟核素的总去除率分别达到96.3%、99.1%及95%以上,完全能够满足国标对此类废水的排放要求。

In view of the Low-Level organic waste Liquid containing suspended solids produced by the nuclear industry,this paper designs a four-stage combination process of microwave Fenton-vacuum suction-zeolite adsorption-ion exchange to realize organic matter,suspended matter and nuclides in waste Liquid.Deep purification treatment.The experimental results show that under the optimal conditions of reaction time 30min,pH=6,n(H2O2)=0.03mol/L and n(H2O2)∶n(Fe 2+)=3,the COD value of the waste Liquid after microwave Fenton Only 15.1mg/L and organic matter removal rate of 95.3%,significantly better than the removal rate of organic matter by activated carbon;suspended matter in the microwave Fenton aftereffect(flocculation reaction)and vacuum filtration combined process,obtained excellent purification effect,the SS purification rate is as high as 99%;the four simulated nuclei of Co,Cs,Sr and Fe can reach the adsorption equilibrium in a short time of 10 minutes after being adsorbed by the zeolite column.Among them,the removal rate of Co,Cs and Fe is as high as 99%;the removal effect of ion exchange column on nuclide is not significant,which is mainly attributed to the contribution of zeolite column to the high adsorption of nuclide.Finally,after the waste Liquid is purified by the four-stage treatment unit,the total removal rates of effluent COD,suspended solids and simulated nuclides are 96.3%,99.1%and 95%respectively,which can fully meet the national standard requirements for such wastewater discharge.