| SBR活性污泥系统去除模拟废水中Pb2+的研究 |
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| 引用本文： | 袁俊莉,刘国华,唐湘南,齐鲁,王洪臣,叶正芳,赵泉林.SBR活性污泥系统去除模拟废水中Pb2+的研究[J].环境科学研究,2022,35(12):2722-2731. |
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| 作者姓名： | 袁俊莉 刘国华 唐湘南 齐鲁 王洪臣 叶正芳 赵泉林 |
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| 作者单位： | 1.中国人民大学环境学院低碳水环境技术中心，北京 100872 |
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| 基金项目： | 重金属废水处理项目(No.2019L20066) |
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| 摘 要： | 为了考察不同Pb2+浓度(3、5、10 mg/L)下，SBR活性污泥系统对模拟含铅废水中Pb2+的去除效果，分析了活性污泥去除Pb2+的影响因素，并采用动力学模型、红外光谱及X射线能谱对活性污泥吸附Pb2+的机理进行了研究. 结果表明:①Pb2+浓度分别为3和5 mg/L时，SBR活性污泥系统对模拟含铅废水中Pb2+的去除率均在98%以上，该系统中活性污泥的Pb2+吸附量为6.2 mg/g；Pb2+浓度为10 mg/L时，SBR活性污泥系统运行后期Pb2+的去除率有所下降，这与该系统Pb2+累积量(351.6 mg)过高有关. ②在Pb2+长期作用下，SBR活性污泥系统各试验阶段的MLSS均会经历先下降再恢复的过程，且该系统中生物多样性和物种丰富度明显下降，可逐渐筛选出对Pb2+耐受性较强的微生物. ③SBR活性污泥系统去除Pb2+的适宜pH范围为6~7，最佳温度为25 ℃. ④活性污泥对Pb2+的吸附机理主要表现为化学吸附作用，包含表面有机络合、离子交换等过程. 研究显示，SBR活性污泥系统更适用于处理低浓度(3、5 mg/L)的含Pb2+废水.
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| 关 键 词： | 重金属废水 Pb2+去除 活性污泥 影响因素 机理分析 |
| 收稿时间： | 2022-03-01 |
Study on Pb2+ Removal from Simulated Wastewater by Activated Sludge in Sequencing Batch Reactor |
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| Affiliation: | 1.Research Center for Carbon Technology of Water Environment, School of Environment &Natural Resources, Renmin University of China, Beijing 100872, China2.School of Environmental Science and Engineering, Peking University, Beijing 100871, China |
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| Abstract: | In order to explore the removal effect from simulated wastewater with different concentrations of Pb2+ (3, 5, and 10 mg/L) in the SBR activated sludge system, analyzed influencing factors of Pb2+ adsorption effects, and investigated the adsorption mechanism of Pb2+ by kinetic model, FTIR and EDS. The results showed that: (1) The removal of Pb2+ in the two SBR-activated sludge systems (Pb2+ concentration: 3 and 5 mg/L) could stably reach more 98%, and Pb2+ adsorption capacity was 6.2 mg/g. However, the Pb2+ removal rate decreased at later operation stage in the SBR activated sludge system with a Pb2+ concentration of 10 mg/L, where 351.6 mg Pb2+ was accumulated, suggesting that high cumulation of Pb2+ inhibited microbial activity. (2) During the long-term operation, activated sludge concentration (MLSS) decreased first and then recovered in the SBR activated sludge systems with different Pb2+ concentrations. Microbial diversity in the Pb2+ containing SBR activated sludge system reduced obviously, and Pb2+-resistant microorganisms were screened out. (3) The optimal pH and temperature were 6-7 and 25 ℃, respectively. (4) The adsorption mechanism of Pb2+ by activated sludge was mainly chemical adsorption, such as surface organic complexation and ion exchange. The study showed the SBR activated sludge system is more suitable for treating wastewater with low concentration (3 and 5 mg/L) of Pb2+. |
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