| 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O3/H2O2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、H2O2初始投加量为114 mg/L、反应时间为15 min条件下,微气泡O3/H2O2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O3能够显著提高臭氧利用效率,缩短反应时间;与普通O3曝气相比,臭氧利用率提高10%,反应时间缩短2/3;微气泡O3/H2O2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,H2O2促进·OH的生成,微气泡曝气强化O3/H2O2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;H2O2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H2O2后,发光抑制率由100%（微气泡O3）降低至20%（微气泡O3/H2O2）,表明H2O2能够有效抑制臭氧氧化深度处理过程中急性毒性的升高。 |
| 关键词: 微气泡O3 化工园区废水 废水深度处理 急性毒性 溶解性有机物 |
| DOI：10.11918/202212015 |
| 分类号:X703.1 |
| 文献标识码:A |
| 基金项目:黑龙江省自然科学基金(HSF20200036) |
|
| Efficiency and mechanism of microbubble O3/H2O2 advanced treatment of secondary effluent from a chemical park |
|
GUO Jinhu,WANG Shutao
|
|
(State Key Laboratory of Urban Water Resource and Environment (Harbin Institute of Technology), Harbin 150090, China)
|
| Abstract: |
| 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 O3/H2O2 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, H2O2 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 O3/H2O2 process. The microbubble O3 can significantly improve the ozone utilization efficiency and shorten the reaction time. Compared with ordinary O3 aeration, the ozone utilization rate increased by 10% and the reaction time shortened by two thirds. The removal process of organics by microbubble O3/H2O2 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, H2O2 promoted the formation of ·OH and microbubbles aeration promoted the production of more ·OH by O3/H2O2 through the process. Dissolved organic matter had the tendency of transforming macromolecular substances into small molecular substances in the process of advanced treatment. H2O2 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 O3, the luminescence inhibition rate of microbubble O3/H2O2 was less than 20%, suggesting that the addition of H2O2 can effectively inhibit the increase of acute toxicity. |
| Key words: microbubble ozone wastewater from chemical industry park wastewater advanced treatment acute toxicity dissolved organic matter |
