颗粒活性炭催化臭氧氧化法降解焦化废水有机物

摘要

以COD和挥发酚作为焦化废水中有机物的指标,探讨了颗粒活性炭催化臭氧氧化法对有机物的处理效果、活性炭的催化效果和最佳投加量.结果表明添加颗粒活性炭能有效提高臭氧对焦化废水中的COD和挥发酚的降解效果,颗粒活性炭投加量为20 g/L时,COD的去除率提高了20％.通过颗粒活性炭吸附试验可以明确颗粒活性炭在臭氧/活性炭系统中的主要作用是催化作用,活性炭的吸附作用只是催化反应的中间过程,基本不会影响有机物的最终去除率.活性炭投加量(10～25 g/L)越大,其催化效果越好,但考虑到费用与效益,以20g/L为宜.活性炭作为催化剂重复使用四次后,其催化效果未明显下降.%The removal effect of organic matters in coking wastewater,the catalytic effect and optimum dosage of GAC were studied by using ozone as oxidant and GAC as catalyst.The results show that COD and phenol can be effectively oxidized in system of ozone and activated carbon.The removal rate of COD increases by 20 ％,when GAC dosage is 20 g/L.The main role of activated carbon in the system is catalysis not adsorption through the adsorption experiment of GAC.The adsorption of GAC is middle process of catalytic reaction,and basically does not impact the final removal rate of organic matters.The catalytic effect can get better with more dosage of activated carbon (10～25 g/L).Considering the economic factors,20 g/L activated carbon dosage is suitable.Activated carbon as catalyst can be used repeatedly,and its catalytic action does not decline obviously after 4 times reusing.