破乳+O_(3)/H_(2)O_(2)组合工艺处理含油废水的研究

Study on the Treatment of Oil Wastewater by Demulsification and O3/H2O2 Combined Process

以天津市某燃料油库区产生的含油废水为研究对象,选择破乳+O_(3)/H_(2)O_(2)高级氧化+活性炭吸附深度处理组合工艺,结果表明,经破乳反应温度25℃、反应时间为25 min、PAM投加量1 mg/L、pH 7、破乳剂投加比例0.4%时,破乳效果最佳,COD和石油类的去除率为56.5%;经O_(3)/H_(2)O_(2)氧化工艺,在温度25℃、pH 8±0.2、O_(3)流量2.5 L/min、质量浓度26 mg/L、H_(2)O_(2)投加量0.56 g/L、反应时间60 min时,COD和石油类的去除效果达到理想效果,去除率分别为69.25%和79.83%;深度处理过程中,活性炭投加量与废水质量比为1:10、吸附平衡时间为15 min,COD和石油类的去除率分别为41.17%和93.72%,经组合处理后的出水COD和石油类浓度分别为289.4 mg/L和0.33 mg/L,满足《GB/T 31962—2015污水排入城镇下水管水质标准》B级标准和《DB 12/356—2018天津市污水综合排放标准》三级排放标准,为处理含油废水提供理论支撑。

The oil wastewater from a fuel oil reservoir in Tianjin was selected as the research object.The combined process of demulsification and O_(3)/H_(2)O_(2)advanced oxidation and activated carbon adsorption advanced treatment was selected.The research results showed that the demulsification effect was the best when the reaction temperature was 25℃,the reaction time was 25 min,the dosage of PAM was 1 mg/L,the pH was 7 and the dosage of demulsifier was 0.4%.The removal rate of COD and petroleum was 56.5%.O_(3)/H_(2)O_(2)oxidation process was found the removal effect of COD and petroleum reached the ideal effect when the temperature was 25℃,pH was 8±0.2,O_(3)flow rate was 2.5 L/min,mass concentration was 26 mg/L,H_(2)O_(2)dosage was 0.56 g/L and reaction time was 60 min,.The removal rates of COD and petroleum were 69.25%and 79.83%,respectively.In the advanced treatment process,the mass ratio of activated carbon to wastewater was 1:10,and the adsorption equilibrium time was 15min.The removal rates of COD and petroleum were 41.17%and 93.72%,respectively.After combined treatment,the effluent COD and petroleum concentrations were 289.4 mg/L and 0.33mg/L,respectively.It met the Class B standard of GB/T 31962—2015 and the Class 3 discharge standard of Tianjin Municipal Sewage Comprehensive Discharge Standard(DB 12/356—2018),which provided theoretical support for industrial treatment of the wastewater.