O<sub>3</sub>-PAC-陶瓷膜耦合技术处理苯酚废水性能研究

杜明辉; 张旺; 李丽萍; 张耀宗; 孙晓明

doi:10.12153/j.issn.1674-991X.20210610

O₃-PAC-陶瓷膜耦合技术处理苯酚废水性能研究

doi: 10.12153/j.issn.1674-991X.20210610

1.
国家环境保护生态工业重点实验室，中国环境科学研究院
2.
华北理工大学建筑与工程学院

基金项目: 国家水体污染控制与治理科技重大专项（2017ZX07402-002），国家环境保护生态工业重点实验室开放基金（2022KFF-15），中央级公益性科研院所基本科研业务费专项（2022YSKY-09）

详细信息

作者简介:
杜明辉（1991—），男，硕士，主要从事水污染控制与废水资源化研究，dmh17367582496@163.com

通讯作者:
孙晓明（1978—），男，研究员，博士，主要从事水污染控制与废水资源化研究，sunxm52@126.com

中图分类号: X703
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出版历程
- 收稿日期: 2021-10-24

Study on the performance of O₃-PAC-ceramic membrane coupling technology for phenol wastewater treatment

1.
State Environmental Protection Key Laboratory of Eco-Industry, Chinese Research Academy of Environmental Sciences
2.
College of Civil Engineering, North China University of Science and Technology

摘要

摘要:
臭氧-粉末活性炭（O₃-PAC）废水处理技术具备发展潜力，但废水与PAC无法有效分离成为该技术的瓶颈。利用陶瓷膜技术构建了O₃-PAC-陶瓷膜去除苯酚耦合体系，采用反应动力学、串联阻力模型以及Hermans-Bredee模型分别对COD去除和PAC膜分离性能进行研究。结果表明：O₃-PAC在40 min内对COD去除率达到100%，反应速率是臭氧-颗粒活性炭（O₃-GAC）的2.5倍；采用陶瓷膜对PAC和废水进行分离，操作压力超过0.06 MPa时，可逆污染向不可逆污染转化；膜污染是由完全堵塞向滤饼堵塞转化的过程，提高废水在膜表面的流速可以破坏滤饼层的形成；试验连续进行6个周期后，40 min时模拟废水的COD去除率保持在95%以上，但不可逆污染有增加的趋势。
- 臭氧 /
- 粉末活性炭 /
- 陶瓷膜 /
- 膜污染
Abstract:
Ozone-powdered activated carbon (O₃-PAC) wastewater treatment technology has good development potential, but the inability to effectively separate wastewater from PAC has become the technology bottleneck. A coupled O₃-PAC-ceramic membrane technology system was constructed with phenol as the target pollutant. The technology was investigated in terms of the performance of COD removal and membrane separation of PAC by reaction kinetics, the tandem resistance model and the Hermans-Bredee model, respectively. The results showed that O₃-PAC was able to achieve 100% COD removal within 40 min, and the reaction rate was 2.5 times that of O₃-GAC. PAC and wastewater were separated by the ceramic membrane, and when the operating pressure exceeded 0.06 MPa, the reversible contamination was converted to irreversible contamination. Membrane contamination was a process of conversion from complete blockage to filter cake blockage, and increasing the wastewater flow rate on the membrane surface could destroy the formation of the filter cake layer. After six consecutive cycles of the experiment, COD removal rate of the simulated wastewater at 40 min remained above 95%, but the irreversible contamination of the ceramic membrane tended to increase.
- ozone /
- powdered activated carbon /
- ceramic membrane /
- membrane fouling

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图 1 试验装置

Figure 1. Experimental apparatus

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图 2 不同氧化方式下COD去除率变化

Figure 2. Variations of COD removal rate under different oxidation methods

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图 3 COD去除率随PAC投加量的变化

Figure 3. Variation of COD removal rate with PAC dosage

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图 4 GAC和PAC吸附去除COD差异

Figure 4. Differences of COD removal by GAC and PAC adsorption

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图 5 反应过程中的液相O₃浓度变化

Figure 5. Variation of liquid phase ozone concentration during the reaction

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图 6 操作压力对陶瓷膜过滤的影响

Figure 6. Influence of operating pressure on ceramic membrane filtration

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图 7 搅拌速度对膜比通量的影响

Figure 7. Effect of stirring speed on membrane flux

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图 8 基于Hermans-Bredee的膜堵塞理论分析

Figure 8. Theoretical analysis of membrane clogging based on Hermans-Bredee

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图 9 连续运行6次COD去除率和陶瓷膜阻力的变化

Figure 9. Variation of COD removal rate and ceramic membrane resistance after 6 consecutive runs

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图 10 连续试验前后PAC样品与陶瓷膜片扫描电镜图像

Figure 10. SEM images of PAC samples and ceramic membrane before and after consecutive experiments

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表 1 COD去除率随时间变化拟一级动力学结果

Table 1. Simulation of the first-order kinetic results of COD removal rate variation with time

反应条件动力学参数
k/min^-1 R²

O₃ 0.0251 0.9921
O₃+GAC 0.0295 0.9934
O₃+PAC 0.0744 0.9936

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