阴离⼦型聚丙烯酰胺与 Klebsiella sp. J1 胞外聚合物协同作⽤及其对提⾼可溶性镉去除的絮体特性
Synergetic effects and flocculation behavior of anionic polyacrylamide and extracellular polymeric substrates extracted from Klebsiella sp. J1 on improving soluble cadmium removal.
机构信息
School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, People's Republic of China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, People's Republic of China.
School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, People's Republic of China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, People's Republic of China.
出版信息
Bioresour Technol. 2015 Jan;175:34-41. doi: 10.1016/j.biortech.2014.10.044. Epub 2014 Oct 18.
The performance and flocs properties in removing soluble cadmium of the dual flocculant APAM-MFX (anionic polyacrylamide APAM used in combination with extracellular polymeric substrates extracted from Klebsiella sp. J1 MFX) were studied compared with the performance of using bioflocculant alone. In addition, adsorption isotherms and kinetic process for Cd(II) adsorption onto APAM-MFX were investigated. APAM-MFX synergistically improved the Cd(II) removal percentage by 82.68%. Characteristic flocs formed by APAM-MFX indicated the synergetic effects resulted from additional bridging bonds between APAM and MFX. Adsorption process was best described by the Freundlich isotherm and pseudo-second order kinetic model. The mean free energy E (8.39-8.57kJmol(-1)) and activation energy Ea (45.09kJmol(-1)) were determined. Based on the results, the main mechanism of Cd(II) removal by APAM-MFX could be chemical ion exchange, and the liquid-film diffusion step was the rate-limiting step.
研究了双絮凝剂 APAM-MFX（与从 Klebsiella sp. J1 MFX 中提取的细胞外聚合物底物结合使用的阴离子聚丙烯酰胺 APAM）去除可溶性镉的性能和絮体特性，与单独使用生物絮凝剂的性能进行了比较。此外，还研究了 Cd(II)在 APAM-MFX 上的吸附等温线和动力学过程。APAM-MFX 协同作用将 Cd(II)去除率提高了 82.68%。由 APAM-MFX 形成的特征絮体表明，APAM 和 MFX 之间额外的桥键产生了协同效应。吸附过程最好用 Freundlich 等温线和拟二级动力学模型来描述。确定了平均自由能 E（8.39-8.57kJmol(-1)) 和活化能 Ea（45.09kJmol(-1))。根据这些结果，APAM-MFX 去除 Cd(II)的主要机制可能是化学离子交换，液膜扩散步骤是限速步骤。
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