2017 Volume 11 Issue 9
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CAO Aiqing, WANG Yili, WANG Mengyang, HU Wei. Effect of typical chemical conditions on promoting aggregation of digested sludge by Fe2+[J]. Chinese Journal of Environmental Engineering, 2017, 11(9): 5166-5174. doi: 10.12030/j.cjee.201612124
Citation: CAO Aiqing, WANG Yili, WANG Mengyang, HU Wei. Effect of typical chemical conditions on promoting aggregation of digested sludge by Fe2+[J]. Chinese Journal of Environmental Engineering, 2017, 11(9): 5166-5174. doi: 10.12030/j.cjee.201612124
shu

Effect of typical chemical conditions on promoting aggregation of digested sludge by Fe2+

  • 1.

    College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China

  • Received Date: 03/03/2017
    Accepted Date: 18/12/2016
    Available Online: 26/08/2017
    Fund Project:
  • In this study, the effects of Fe2+ concentration, pH and ionic strength on the promoting aggregation of digested sludge(DS) by Fe2+were investigated, and the extended DLVO (EDLVO) theory was used to reveal the variation characteristics of binding energy among sludge flocs during Fe2+ promoting aggregation. The three-layered EPS extracted from typical DS sample was characterized by three-dimensional excitation emission matrix fluorescence spectroscopy (EEM). The results showed that the optimum chemical conditions for Fe2+ promoting aggregation were determined at Fe2+ dosage of 50 mmol·L-1, pH 7.57 for raw DS, and ionic strength of 0.01 mol·L-1, respectively. Under the optimal Fe2+ concentration or pH, Fe2+ promoting aggregation of DS was ascribed to the increase of the Zeta potential, size and compactness, as well as the hydrophobicity of DS flocs, and the reduction in the energy barrier among DS flocs. However, at the optimal ionic strength, Fe2+ promoting aggregation was attributed to increasing the size and compactness of DS flocs. The increase of ionic strength could not result in the decrease of the energy barrier among DS flocs. EEMs of three-layered EPS extracted from typical DS sample indicated that the combination between Fe2+ and slime was the main approach to promote aggregation of DS, and the corresponding slime components were protein A, UV-visible fulvic acid and fulvic acid.
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Effect of typical chemical conditions on promoting aggregation of digested sludge by Fe2+

  • Received Date: 03/03/2017
  • Accepted Date: 18/12/2016
  • Available Online: 26/08/2017
Fund Project:

Abstract: In this study, the effects of Fe2+ concentration, pH and ionic strength on the promoting aggregation of digested sludge(DS) by Fe2+were investigated, and the extended DLVO (EDLVO) theory was used to reveal the variation characteristics of binding energy among sludge flocs during Fe2+ promoting aggregation. The three-layered EPS extracted from typical DS sample was characterized by three-dimensional excitation emission matrix fluorescence spectroscopy (EEM). The results showed that the optimum chemical conditions for Fe2+ promoting aggregation were determined at Fe2+ dosage of 50 mmol·L-1, pH 7.57 for raw DS, and ionic strength of 0.01 mol·L-1, respectively. Under the optimal Fe2+ concentration or pH, Fe2+ promoting aggregation of DS was ascribed to the increase of the Zeta potential, size and compactness, as well as the hydrophobicity of DS flocs, and the reduction in the energy barrier among DS flocs. However, at the optimal ionic strength, Fe2+ promoting aggregation was attributed to increasing the size and compactness of DS flocs. The increase of ionic strength could not result in the decrease of the energy barrier among DS flocs. EEMs of three-layered EPS extracted from typical DS sample indicated that the combination between Fe2+ and slime was the main approach to promote aggregation of DS, and the corresponding slime components were protein A, UV-visible fulvic acid and fulvic acid.

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