Recovery of Nitrogen and Phosphorous as Struvite From Swine Waste Biogas Digester Effluent

P.W.ANTON PERERA; ZHI-YING HAN; YING-XU CHEN; WEI-XIANG WU

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Volume 20 Issue 5

Oct. 2007

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Article Navigation > Biomedical and Environmental Sciences > 2007 > 20(5): 343-350

P.W.ANTON PERERA, ZHI-YING HAN, YING-XU CHEN, WEI-XIANG WU. Recovery of Nitrogen and Phosphorous as Struvite From Swine Waste Biogas Digester Effluent[J]. Biomedical and Environmental Sciences, 2007, 20(5): 343-350.

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P.W.ANTON PERERA, ZHI-YING HAN, YING-XU CHEN, WEI-XIANG WU. Recovery of Nitrogen and Phosphorous as Struvite From Swine Waste Biogas Digester Effluent[J]. Biomedical and Environmental Sciences, 2007, 20(5): 343-350.

Recovery of Nitrogen and Phosphorous as Struvite From Swine Waste Biogas Digester Effluent

College of Environmental and Resource Sciences, Zhejiang University,Hangzhou 310029, Zhejiang, China

Funds: 国家重点基础研究发展计划(973计划)(2002CB410807)%浙江省自然科学重点计划项目(021103723)

Abstract

To investigate the feasibility of nitrogen and phosphorus recovery from swine waste biogas digester effluent and the effects of pH and NH4+: Mg2+: PO43- molar ratio on its precipitation. Methods Precipitation experiments with swine waste biogas digester effluent were conducted at pH 7.5, 8.0, 8.5, and 9.0 together with NH4+: Mg2+: PO43- molar ratios 1: 0.2: 0.08,1: 1: 1, and 1: 1.5: 1.5. Chemical and X-ray diffraction (XRD) analysis were done to determine the composition of the precipitate. Results The highest removal and recovery of NH4+ and PO43- were achieved at pH 9.0 in each experiment. The elevation of pH to 9.0 alone could decrease the initial PO43- concentration from 42 mg L-1 to 4.7 mg L-1 and 89.2% PO43-recovery was achieved. The pH-molar ratio combination 9.0-1: 1.5:1.5 effected 76.5% NH4+ and 68.5% PO43- recovery. The molar ratio of 1: 1:1 together with pH elevation to 9.0 was determined to be the optimum combination for both NH4+ and PO43-removal as it recovered over 70% and 97% of the initial NH4+ and PO43-, respectively. Conclusions Nitrogen and phosphorus can be recovered from biogas digester effluent as struvite.
- Phosphate recovery,
- Ammonium nitrogen recovery,
- Biogas,
- Struvite,
- Swine waste
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

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Recovery of Nitrogen and Phosphorous as Struvite From Swine Waste Biogas Digester Effluent

College of Environmental and Resource Sciences, Zhejiang University,Hangzhou 310029, Zhejiang, China

Funds: 国家重点基础研究发展计划(973计划)(2002CB410807)%浙江省自然科学重点计划项目(021103723)

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Abstract: To investigate the feasibility of nitrogen and phosphorus recovery from swine waste biogas digester effluent and the effects of pH and NH4+: Mg2+: PO43- molar ratio on its precipitation. Methods Precipitation experiments with swine waste biogas digester effluent were conducted at pH 7.5, 8.0, 8.5, and 9.0 together with NH4+: Mg2+: PO43- molar ratios 1: 0.2: 0.08,1: 1: 1, and 1: 1.5: 1.5. Chemical and X-ray diffraction (XRD) analysis were done to determine the composition of the precipitate. Results The highest removal and recovery of NH4+ and PO43- were achieved at pH 9.0 in each experiment. The elevation of pH to 9.0 alone could decrease the initial PO43- concentration from 42 mg L-1 to 4.7 mg L-1 and 89.2% PO43-recovery was achieved. The pH-molar ratio combination 9.0-1: 1.5:1.5 effected 76.5% NH4+ and 68.5% PO43- recovery. The molar ratio of 1: 1:1 together with pH elevation to 9.0 was determined to be the optimum combination for both NH4+ and PO43-removal as it recovered over 70% and 97% of the initial NH4+ and PO43-, respectively. Conclusions Nitrogen and phosphorus can be recovered from biogas digester effluent as struvite.

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