臭氧-铁碳催化氧化法深度处理难降解化工废水研究

Study on Advanced Treatment of Refractory Chemical Wastewater by Ozone-iron-carbon Catalytic Oxidation Process

以化工企业预处理后的废水为对象,以臭氧氧化技术为基础,加入铁刨花、载铁活性炭(Fe@AC)、铁碳球等含铁碳填料作为催化剂,考察不同臭氧投加量及废水初始pH条件下,对难降解化工废水出水COD的改善情况。结果表明,采用铁碳球为催化剂的臭氧-铁碳催化氧化工艺处理,降低难降解化工废水COD的效果明显优于单独臭氧氧化工艺;与以铁刨花、载铁活性炭(Fe@AC)作为填料的臭氧催化氧化相比,各反应阶段去除率均有不同程度的提升。在初始pH=9的反应条件下,反应120 min后,臭氧-铁碳催化氧化的COD去除率达到最优值38.25%。废水经臭氧-铁碳催化氧化后,可生化性得到改善,后续采用活性焦填料好氧生物膜工艺,COD去除率可以稳定保持在40%左右,出水达到化学工业主要水污染物排放标准(DB 32/939-2006)中规定的集中式工业污水处理厂一级排放标准。

Based on the ozone oxidation technology, and iron-containing carbon fillers such as iron shavings, iron-loaded activated carbon(Fe@AC),and iron-carbon balls were added as catalysts for the pretreated wastewater from chemical enterprises in this study. The effects of COD concentration in the effluent of chemical wastewater under the different ozone dosage and initial pH conditions were investigated. The results showed that the ozoneiron-carbon catalytic oxidation process with the iron-carbon ball as a catalyst on the reduction of COD concentration was better than that of the alone ozone oxidation process. Compared with ozone catalytic oxidation with iron shavings and iron-loaded activated carbon(Fe@AC) as fillers, the removal rates of each reaction stage were improved to varying degrees. Under the initial pH=9 reaction condition, the COD removal rate of ozoneiron-carbon catalytic oxidation reached the optimal value of 38.25% after 120 min. After ozone-iron-carbon catalytic oxidation, the biodegradability of wastewater was improved, and the removal rate of COD could be stably maintained at 40% by using an activated coke filler aerobic biofilm process.The effluent reached the first-class discharge standard of the centralized industrial sewage treatment plant, which was from the discharge standard of major water pollutants in the chemical industry(DB 32/939-2006).