Volume 13 Issue 3
Sep.  2020
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Article Navigation >  Water Science and Engineering  > 2020  >  13(3): 193-201
Hui-fang Wu, Jun-ping Wang, Er-gao Duan, Wen-hua Hu, Yi-bo Dong, Guo-qing Zhang. 2020: Phosphorus removal by adsorbent based on poly-aluminum chloride sludge. Water Science and Engineering, 13(3): 193-201. doi: 10.1016/j.wse.2020.09.006
Citation: Hui-fang Wu, Jun-ping Wang, Er-gao Duan, Wen-hua Hu, Yi-bo Dong, Guo-qing Zhang. 2020: Phosphorus removal by adsorbent based on poly-aluminum chloride sludge. Water Science and Engineering, 13(3): 193-201. doi: 10.1016/j.wse.2020.09.006
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Phosphorus removal by adsorbent based on poly-aluminum chloride sludge

doi: 10.1016/j.wse.2020.09.006

  • Department of Municipal Engineering, Nanjing Tech University, Nanjing 211800, China

Funds:  This work was supported by the Primary Research and Development Plan of Jiangsu Province (Grant No. BE2016703), the Natural Science Youth Fund of Jiangsu Province (Grant No. BK20171017), the National Natural Science Youth Fund of China (Grant No. 51707093), and the Science and Technology Program of the Ministry of Housing and Urban-Rural Development of China (Grant No. 2014-K7-010).
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  • Corresponding author: Hui-fang Wu
  • Received Date: 2020-03-31
  • Rev Recd Date: 2020-06-04
    Abstract
  • Phosphorus adsorption tests were carried out using poly-aluminum chloride sludge (PACS), which was collected from a water treatment plant in Nanjing. The amount of phosphorus adsorbed by PACS increased quickly within the first hour and reached equilibrium after about 48 h. The adsorption behavior of PACS for phosphorus is consistent with the Langmuir adsorption isotherm equation (R2 > 0.99) and parallel first-order kinetic equation (R2 > 0.98). With the increase of the PACS concentration, the adsorption capacity of PACS for phosphorus decreased, and the removal rate increased. The results of batch tests showed that the adsorption capacities of PACS for phosphorus ranged from 1.64 to 1.13 mg/g when the pH value varied from 4 to 10. However, the adsorption capacity of PACS was not evidently influenced by temperature. In comparison with the ion exchange resin, the adsorption capacity of PACS was barely inhibited by competitive ions, such as , , and Cl−. The PACS surface after adsorption became smooth, and the vibration peaks of Al–O and Al–OH shifted. Both HCl and NaOH have a strong desorption effect on PACS after adsorption saturation, and with higher concentrations of HCl and NaOH, the desorption effect was stronger. Results of column adsorption experiments showed that with lower phosphorus and hydraulic loads, the adsorption column took longer to reach saturation. This indicated that PACS could be used as an efficient material for removal of phosphorus from water. This study provides a new treatment method with PACS.

     

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