微气泡曝气O3／H2O2处理RO浓水的效能及影响因素

采用O3／H2O2高级氧化工艺处理炼油厂反渗透（RO）浓水，用溶气泵加压溶气并产生微气泡强化传质，确定装置运行条件，考察气体中臭氧浓度、O3／H2O2初始摩尔比、pH和温度对O3／H2O2处理RO浓水效果的影响，并对RO浓水处理效能进行研究。结果表明，随着气体中臭氧浓度的增加，COD的去除率基本呈线性增加；加入适当量H，0，能提高臭氧氧化RO浓水的效果，O3／H2O2初始摩尔比在0～0．8范围内，COD的去除率先增加后下降，O3／H2O2初始摩尔比为O．5时COD去除率最大；pH从6．84增加到9．01，COD去除率逐渐增大，pH为10．03时COD去除率反而降低；在14～28℃范围内，温度低时，升高温度COD去除率增加较大，温度较高时，升高温度对COD去除率的影响较小。为考察该工艺的稳定性，在H：0：／0，初始摩尔比为O．5、溶液pH为8～9、臭氧浓度为80～100mg／L、温度为10-28℃条件下，对COD为90～140mg／L的RO浓水氧化处理4～10h，出水COD维持在39．9～49．9mg／L，达到《城镇污水处理厂污染物排放标准（GB18918—2002）》中的一级A标准；去除1gCOD消耗031．4～3．3g，消耗0，与H，02的总氧量为2．2～4．4g。

Treatment efficiency and influencing factors of RO concentrated water by microbubble ozonation with H2O2

Treatment efficiency and influencing factors of refinery reverse osmosis （RO） concentrated water with O3/H2O2 advanced oxidation process were investigated, in which O3/H2O2 process was enhanced by micro- bubble, and microbubble was produced by dissolved air pump. The operating conditions of the device were de- termined. The effects of ozone dosage, the initial mole ratio of H2O/O3, pH and reaction temperature on the degradation of RO concentrated water were discussed. Experimental results showed that the degradation efficiency of COD approximately linearly increased with the increasing ozone dosage. Proper H202 added could improve the degradation efficiency by ozonation. The degradation efficiency firstly increased then decreased when the initial mole ratio of H202/O3 was 0 -0.8, and the optimum initial mole ratio was 0.5. The degradation efficiency in- creased in the range of pH 6.84 - 9.01, but decreased at pH 10.03. Rising temperature the degradation effi- ciency increased observably at low temperature, but the reaction temperature had no remarkable effect on the degradation efficiency at higher temperature in the temperature range of 14 ℃ to 28 ℃. The range of effluent COD were 39.9 - 49.9 mg/L under the conditions of initial mole ratio 0.5, pH 8 - 9, ozone dosage of 80 - 100 rag/L, COD of 90 - 140 mg/L at 10 - 28 ℃ after 4 -10 h. The treated water can meet Category B, Class 1 un- der the standard of Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant （GB18918- 2002）. Removing 1 g COD consumed 1.4-3.3 g ozone and 2.2-4.4 g total oxygen.