微气泡O_(3)/H_(2)O_(2)深度处理某化工园区二级出水效能与机制  

Efficiency and mechanism of microbubble O_(3)/H_(2)O_(2) advanced treatment of secondary effluent from a chemical park

作　　者：郭金虎 王树涛[1] GUO Jinhu;WANG Shutao(State Key Laboratory of Urban Water Resource and Environment(Harbin Institute of Technology),Harbin 150090,China)

机构地区：[1]城市水资源与水环境国家重点实验室(哈尔滨工业大学),哈尔滨150090

出　　处：《哈尔滨工业大学学报》2024年第2期132-140,共9页Journal of Harbin Institute of Technology

基　　金：黑龙江省自然科学基金(HSF20200036)。

摘　　要：化工园区废水经过二级处理后,仍含有多种有毒污染物,依然对生态环境存在较大风险,为此,建立微气泡O_(3)/H_(2)O_(2)深度处理工艺,研究某工业园区二级出水处理效能,确定最佳工艺参数,探究污染物降解机制,并对处理出水进行毒性评价。结果表明:在pH为7.3、臭氧投加量为60 mg/L、H_(2)O_(2)初始投加量为114 mg/L、反应时间为15 min条件下,微气泡O_(3)/H_(2)O_(2)对二级出水中有毒污染物具有良好的降解效果,COD和TOC去除率分别达到47.41%和46.61%;微气泡O_(3)能够显著提高臭氧利用效率,缩短反应时间;与普通O_(3)曝气相比,臭氧利用率提高10%,反应时间缩短2/3;微气泡O_(3)/H_(2)O_(2)工艺过程中,有机物去除过程遵循表观二级反应动力学;电子顺磁共振(EPR)技术证明羟基自由基(·OH)参与有机物的降解过程,H_(2)O_(2)促进·OH的生成,微气泡曝气强化O_(3)/H_(2)O_(2)产生更多的·OH;二级出水中溶解性有机物(DOM)在深度处理过程中存在大分子物质向小分子物质转化的趋势;H_(2)O_(2)能够增强臭氧对疏水中性组分的去除能力,改变臭氧对污染物的降解途径。添加H_(2)O_(2)后,发光抑制率由100%(微气泡O_(3))降低至20%(微气泡O_(3)/H_(2)O_(2)),表明H_(2)O_(2)能够有效抑制臭氧氧化深度处理过程中急性毒性的升高。The secondary effluent of the chemical industry park contains a variety of toxic pollutants,which still poses a great risk to the ecological environment.In this study,the microbubble O_(3)/H_(2) O_(2) process was established for advanced treatment of secondary effluent from a chemical industry park,and the operation parameters,pollutant degradation mechanism and toxicity evaluation were studied.The best operating parameters were pH 7.3,ozone dosage 60 mg/L,H_(2) O_(2) initial dosage 114 mg/L,reaction time 15 min.Under this condition,the removal rates of COD and TOC were 47.41% and 46.61% respectively in microbubble O_(3)/H_(2) O_(2) process.The microbubble O_(3) can significantly improve the ozone utilization efficiency and shorten the reaction time.Compared with ordinary O_(3) aeration,the ozone utilization rate increased by 10% and the reaction time shortened by two thirds.The removal process of organics by microbubble O_(3)/H_(2) O_(2) process followed the apparent second-order reaction kinetics;the electron paramagnetic resonance(EPR)technology proved that hydroxyl radical(·OH)played a role in the degradation of organic substances,H_(2) O_(2) promoted the formation of·OH and microbubbles aeration promoted the production of more·OH by O_(3)/H_(2) O_(2) through the process.Dissolved organic matter had the tendency of transforming macromolecular substances into small molecular substances in the process of advanced treatment.H_(2) O_(2) can enhance the removal ability of ozone to hydrophobic neutral components and change the degradation path of ozone to pollutants.Compared with 100% luminescence inhibition rate of microbubble O_(3),the luminescence inhibition rate of microbubble O_(3)/H_(2) O_(2) was less than 20%,suggesting that the addition of H_(2) O_(2) can effectively inhibit the increase of acute toxicity.

关 键 词：微气泡O_(3) 化工园区废水 废水深度处理 急性毒性 溶解性有机物 

分 类 号：X703.1[环境科学与工程—环境工程]