光助氧化法降解印染废水的应用性研究

对光助氧化法处理印染废水进行了实验研究.探讨了单纯的紫外光光照时间、H2O2浓度、印染水溶液的初始pH值以及Fenton试剂中H2O2的浓度和Fe2 比值对CODCr去除率和脱色率的影响.结果表明:光助氧化法对印染废水有比较好的处理效果,单纯紫外光照射6 h,脱色率和CODCr去除率分别为68.8%和19.9%;当加入6 mmol/L H2O2并光照80 min后,两者分别上升为90.7%和74.3%;在同样的条件下,再调整废水使其pH=3,脱色率和CODCr去除率高达92.8%和84.4%;加入Fenton试剂并保持Fe2 ∶H2O2=1∶5,尽管由于Fe2 及Fe3 的存在,脱色率下降为87.5%,而CODCr去除率升高到92.5%.

Study on Degradation of Dyeing Wastewater by Photo-assisted Oxidation

In this paper,the method of photo-assisted oxidation for the dyeing industrial wastewater was studied.Parameters such as the irradiation time of UV,the amount of H_(2)O_(2),the pH value,the proportion of Fe~(2 )and H_(2)O_(2)in Fenton reagent were investigated.The results showed that this process was effective for the treatment of dyeing wastewater.The removal rates of the color and the chemical oxygen demand(COD_(Cr)) are 68.8% and 19.9% with 6h irradiating.They come to 90.7% and 74.3% respectively after 80min reaction with 6mmol/L H_(2)O_(2).When the wastewater is adjusted to the pH=3,92.8% color and 84.4% COD_(Cr)were removed.When the Fenton reagent was added and the rate between Fe~(2 )and H_(2)O_(2)was maintained to 1:5,the color removal rate was decreased to 87.5% because of the presence of the Fe~(2 ) and Fe~(3 );while COD_(Cr)was increasee to 92.5%.