Heavy metals removal without phosphorus loss from anaerobically digested sewage sludge was investigated by conducting batch experiments using hydrogen peroxide and/or iron sulphate under acidified conditions at pH 3. The addition of hydrogen peroxide to the sludge improved the elution efficiencies of As, Cd, Cu and Zn with phosphorus loss from the sludge. The optimum initial concentrations of hydrogen peroxide were. Respectively. 0.1% for As, Cd, Mn and Zn and 0.5% for Cu and Ni. The combined process of 0.1% hydrogen peroxide and 1 g Fe/L ferric sulphate enhanced the initial elution rate of Cu and Cr compared to the addition of either ferric sulphate or hydrogen peroxide, indicating that oxidants stronger than hydrogen peroxide were produced in the sludge. Furthermore, the combined process immobilised phosphorus in the sludge due to co-precipitation with ferric hydroxide or precipitation as ferric phosphate. It was concluded that there is a possibility that the combined process could remove heavy metals effectively without phosphorus loss from anaerobically digested sewage sludge.
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Research Article|
July 01 2008
Enhanced heavy metals removal without phosphorus loss from anaerobically digested sewage sludge
A. Ito;
1Department of Frontier Materials and Function Engineering, Iwate University, Ueda 4-3-5, Morioka 020-8551, Japan [email protected]
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K. Takahashi;
K. Takahashi
2Department of Civil and Environmental Engineering, Iwate University, Ueda 4-3-5, Morioka 020-8551, Japan [email protected]
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J. Aizawa;
J. Aizawa
2Department of Civil and Environmental Engineering, Iwate University, Ueda 4-3-5, Morioka 020-8551, Japan [email protected]
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T. Umita
T. Umita
2Department of Civil and Environmental Engineering, Iwate University, Ueda 4-3-5, Morioka 020-8551, Japan [email protected]
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Water Sci Technol (2008) 58 (1): 201–206.
Citation
A. Ito, K. Takahashi, J. Aizawa, T. Umita; Enhanced heavy metals removal without phosphorus loss from anaerobically digested sewage sludge. Water Sci Technol 1 July 2008; 58 (1): 201–206. doi: https://doi.org/10.2166/wst.2008.642
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