With the goal of reducing the amounts of phosphorus (P), copper (Cu), and zinc (Zn) discharged from swine wastewater activated sludge treatment facilities, we studied the elution of these elements from activated sludge at various pH values. Sludge samples with neutral pH collected from three farms were incubated at pH values ranging from 3 to 10. The soluble concentrations of these elements changed dramatically with pH and were highest at pH 3. We assumed that P present in the sludge under neutral and alkaline conditions was in insoluble form bound up with magnesium (Mg) and calcium (Ca), because Ca and Mg also eluted from the sludge at low pH. To clarify forms of Zn and Cu in the sludge, we performed a sequential extraction analysis. Zinc in adsorbed, organically bound, and sulfide fractions made up a large proportion of the total Zn. Copper in organically bound, carbonate, and sulfide fractions made up a large proportion of the total Cu. The soluble P concentrations were lowest at pH 9 or 10 (11–36 mg/L), the soluble Zn concentrations were lowest at pH 8 or 9 (0.07–0.15 mg/L), and the soluble Cu concentrations were lowest at pH 6–9 (0.2 mg/L, the detection limit).
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Research Article|
June 11 2014
Effect of pH on phosphorus, copper, and zinc elution from swine wastewater activated sludge Available to Purchase
Miyoko Waki;
1National Institute of Livestock and Grassland Science, National Agriculture and Food Research Organization, Ikenodai 2, Tsukuba, Ibaraki 305–0901, Japan
E-mail: [email protected]
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Tomoko Yasuda;
Tomoko Yasuda
1National Institute of Livestock and Grassland Science, National Agriculture and Food Research Organization, Ikenodai 2, Tsukuba, Ibaraki 305–0901, Japan
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Yasuyuki Fukumoto;
Yasuyuki Fukumoto
1National Institute of Livestock and Grassland Science, National Agriculture and Food Research Organization, Ikenodai 2, Tsukuba, Ibaraki 305–0901, Japan
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Kazuyoshi Suzuki
Kazuyoshi Suzuki
1National Institute of Livestock and Grassland Science, National Agriculture and Food Research Organization, Ikenodai 2, Tsukuba, Ibaraki 305–0901, Japan
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Water Sci Technol (2014) 70 (4): 593–598.
Article history
Received:
February 28 2014
Accepted:
May 29 2014
Citation
Miyoko Waki, Tomoko Yasuda, Yasuyuki Fukumoto, Kazuyoshi Suzuki; Effect of pH on phosphorus, copper, and zinc elution from swine wastewater activated sludge. Water Sci Technol 1 August 2014; 70 (4): 593–598. doi: https://doi.org/10.2166/wst.2014.274
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