Degradation efficiency and influencing factors of organic contaminants in O3-H2O2 system based on ozone micro-nanobubbles
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摘要:
针对传统臭氧氧化技术传质效率低和易产生消毒副产物的问题，采用臭氧微纳米气泡联合H2O2氧化体系提高传质效率，增加氧化能力及减少消毒副产物的产生。通过试验模拟研究了臭氧速率、H2O2浓度、地下水常见地球化学参数对2-氯酚降解效果的影响，并研究了O3-H2O2体系对典型环境污染物的降解效果。结果表明：臭氧速率在40 mg/min时，臭氧利用率最高；H2O2浓度为0.5 mmol/L、pH为9时，O3-H2O2体系对2-氯酚的降解效果最佳；Cl−、CO3 2−/HCO3 −、天然有机质的存在对O3-H2O2体系均具有抑制作用；O3-H2O2体系对抗生素类、氯酚类、氯代烃、含硝基类有机物4类典型的环境污染物都具有较好的降解效果。
Abstract:Aiming at solving the problem of low mass transfer efficiency and easy generation of disinfection by-products of traditional ozonation technology, ozone micro-nanobubbles combined with H2O2 oxidation system was adopted to improve mass transfer efficiency and oxidation capacity and reduce the production of disinfection by-products. The effects of ozone flow rate, H2O2 concentration, and common groundwater geochemical parameters on the degradation of 2-chlorophenol were investigated, and the application of the O3-H2O2 system to typical environmental pollutants was studied. The experimental results showed that the ozone utilization rate was the highest when the ozone rate was 40 mg/min; O3-H2O2 system had the best degradation efficiency on 2-chlorophenol when H2O2 concentration was 0.5 mmol/L and pH=9; the existence of Cl−, CO3 2−/HCO3 − and natural organic matter inhibited O3-H2O2 system; O3-H2O2 system had good degradation effects on four typical environmental pollutants including antibiotics, chlorophenols, chlorinated hydrocarbons, and nitro-containing organic compounds.
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Key words:
- ozone /
- hydrogen peroxide /
- micro-nanobubbles /
- advanced oxidation /
- bromate
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图 2 臭氧速率对臭氧降解2-氯酚的影响
Figure 2. Effect of ozone rate on the degradation of 2-chlorophenol by ozone
图 3 不同臭氧速率下臭氧通入量与2-氯酚消耗量的比值
Figure 3. The ratios of total O3 injection to 2-CP consumption at different ozone inject rates
图 4 O3- H2O2体系对2-氯酚的降解准一级动力学过程
注：C/C0为反应体系中污染物的剩余浓度与初始浓度的比值。
Figure 4. Pseudo-first-order kinetic process of 2-chlorophenol degradation in O3-H2O2 system
图 5 pH对O3-H2O2体系降解2-氯酚的影响
Figure 5. Effect of pH on degradation of 2-chlorophenol in O3-H2O2 system
图 6 地下水环境中常见阴离子对O3- H2O2体系降解2-氯酚的影响
Figure 6. Effect of common anions in groundwater on degradation of 2-chlorophenol in O3-H2O2 system
图 7 黄腐酸对O3- H2O2体系降解2-氯酚的影响
Figure 7. Effect of fulvic acid on degradation of 2-chlorophenol in O3-H2O2 system
图 8 O3- H2O2体系中溴酸根的可能的产生路径[28]
Figure 8. Possible production pathways of bromate in O3-H2O2 system
图 9 O3-H2O2体系中消毒副产物生成情况
Figure 9. Formation of disinfection by-products in O3-H2O2 system
图 10 O3- H2O2体系降解不同类型污染物的应用
Figure 10. Application of O3-H2O2 system to degrade different types of pollutants
表 1 O3-H2O2体系降解2-氯酚准一级动力学模型参数
Table 1. Pseudo-first-order kinetic model parameters for degradation of 2-chlorophenol in O3-H2O2 system
H2O2浓度/（ mmol/L） K1/min−1 R2 H2O2：0.5 −0.022 04 0.907 O3-H2O2：0 −0.436 75 0.999 O3-H2O2：0.05 −0.477 18 0.995 O3-H2O2：0.10 −0.483 67 0.983 O3-H2O2：0.20 −0.558 07 0.998 O3-H2O2：0.50 −0.599 61 0.998 O3-H2O2：1.00 −0.483 26 0.997 
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