Heavy Metal Removal and Phosphorus Retention Using the Fenton Process for Sustainable Recycling of Anaerobically Digested Sewage Sludge
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概要
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Heavy metal removal from anaerobically digested sewage sludge and phosphorus (P) retention in the sludge were investigated through batch experiments using H<SUB>2</SUB>O<SUB>2</SUB> and Fe<SUB>2</SUB>(SO<SUB>4</SUB>)<SUB>3</SUB> as the agents for oxidizing insoluble metallic compounds under acidic condition at pH 2.5. The addition of H<SUB>2</SUB>O<SUB>2</SUB> to the sludge eluted Cd, Cu and Zn from the sludge more effectively than that of acid only. The initial concentrations of H<SUB>2</SUB>O<SUB>2</SUB> required for the maximum elution efficiency were 1 g/L for Cd and Zn and 5 g/L for Cu. The addition of ferric ion (Fe(III)) also improved the elution efficiency of Cu. Ferric iron addition under the initial H<SUB>2</SUB>O<SUB>2</SUB> concentration of 0.2 g/L gave rise to a more effective elution of Cu from the sludge than that in the absence of H<SUB>2</SUB>O<SUB>2</SUB> or Fe(III). The addition of acid only or both acid and H<SUB>2</SUB>O<SUB>2</SUB> caused the elution of P together with heavy metals. However, the addition of Fe(III) (1 g/L Fe) could retain P in the sludge, most of which was present as a slow-acting P fertilizer.
著者
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ITO Ayumi
Department of Frontier Materials and Function Engineering, Iwate University, Japan
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TAKAHASHI Kenta
Shimizu Corporation, Japan
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SUZUKI Jyunya
Department of Civil and Environmental Engineering, Iwate University, Japan
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UMITA Teruyuki
Department of Civil and Environmental Engineering, Iwate University, Japan