| 高铁酸钾调理改善活性污泥脱水性能的反应机制研究 |
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| 引用本文： | 曹秉帝,张伟军,王东升,段晋明.高铁酸钾调理改善活性污泥脱水性能的反应机制研究[J].环境科学学报,2015,35(12):3805-3814. |
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| 作者姓名： | 曹秉帝 张伟军 王东升 段晋明 |
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| 作者单位： | 1. 西安建筑科技大学市政与环境工程学院, 西安 710055;2. 中国科学院生态环境研究中心环境水质学国家重点实验室, 北京 100085,中国科学院生态环境研究中心环境水质学国家重点实验室, 北京 100085,中国科学院生态环境研究中心环境水质学国家重点实验室, 北京 100085,西安建筑科技大学市政与环境工程学院, 西安 710055 |
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| 基金项目： | 国家水体污染控制与治理重大科技专项(No.2012ZX07408001) |
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| 摘 要： | 研究了高铁酸钾(K_2FeO_4)对处理活性污泥脱水性的效果,重点考察了不同pH和剂量条件下,K_2FeO_4调理对污泥过滤脱水特性和胞外聚合物(EPS)分布和组成的影响,以深入认识K_2FeO_4调理污泥的反应机制.研究表明,K_2FeO_4调理效果随pH值的降低而改善,其不仅有氧化裂解作用导致结合型EPS(BEPS)释放,同时其还原产物三价铁离子兼具混凝功效,能够通过电中和与界面吸附去除部分溶解性EPS(SEPS),同时压缩EPS结构,增强污泥絮体结构.此外,当pH值为3,K_2FeO_4投加量为0.1 g·g~(-1)(以TSS计)时,污泥过滤脱水速率和程度均达到最佳.过量投加K_2FeO_4(0.2 g·g~(-1),以TSS计)后,BEPS大量释放,污泥过滤阻力增加,脱水性能恶化.
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| 关 键 词： | 污泥 K2FeO4 EPS 脱水性 废物处理 氧化 混凝 |
| 收稿时间： | 2015/1/21 0:00:00 |
| 修稿时间： | 2015/3/11 0:00:00 |
Insights into the mechanism of sludge conditioning with potassium ferrate for improving dewatering property of activated sludge |
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| CAO Bingdi,ZHANG Weijun,WANG Dongsheng and DUAN Jinming.Insights into the mechanism of sludge conditioning with potassium ferrate for improving dewatering property of activated sludge[J].Acta Scientiae Circumstantiae,2015,35(12):3805-3814. |
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| Authors: | CAO Bingdi ZHANG Weijun WANG Dongsheng and DUAN Jinming |
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| Affiliation: | 1. School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055;2. State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085,State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085,State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085 and School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055 |
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| Abstract: | to get insights into the sludge conditioning reaction mechanism, This paper focused on activated sludge conditioning efficiency with potassium ferrate (K2FeO4), emphasizing on investigating pH effect and the dosage of potassium ferrate on sludge filtration dewatering characteristics. The result indicates that sludge conditioning efficiency with ferrate was improved with decreased pH. Ferrate can solubilize EPS through oxidation process and also remove a portion of soluble EPS (SEPS) by charge neutralization and interfacial adsorption of hydrolyzed ferric ions, consequently compressing EPS and decreasing total extractable EPS content. In addition, when pH and dosage of potassium ferrate were 3 and 0.1 g·g-1 TSS, both sludge filtration dewatering rate and drying performance reached the maximum. Overdosed potassium ferrate (>0.2 g·g-1 TSS) resulted in release of large amount of bound EPS, consequently increase in filtration resistance and deterioration of dewatering property. |
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| Keywords: | activated sludge potassium ferrate EPS dewaterability waste treatment oxidation coagulation |
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