Volume 22 Issue 3
Jun.  2009
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P.W.ANTON PERERA, WEI-XIANG WU, YING-XU CHEN, ZHI-YING HAN. Struvite Recovery from Swine Waste Biogas Digester Effluent through a Stainless Steel Device under Constant pH Conditions[J]. Biomedical and Environmental Sciences, 2009, 22(3): 201-209.
Citation: P.W.ANTON PERERA, WEI-XIANG WU, YING-XU CHEN, ZHI-YING HAN. Struvite Recovery from Swine Waste Biogas Digester Effluent through a Stainless Steel Device under Constant pH Conditions[J]. Biomedical and Environmental Sciences, 2009, 22(3): 201-209.

Struvite Recovery from Swine Waste Biogas Digester Effluent through a Stainless Steel Device under Constant pH Conditions

Funds:  国家重点基础研究发展规划(973计划)(2002CB410807)%key Project of Science and Technology of Zhejiang Province(021103723)
  • Objective To investigate the struvite precipitation under constant and non-constant pH conditions and to test a stainless steel device under different operating regimes to maximize the recovery of struvite. Methods The molar ratio of NH4+:Mg2+:PO43- was adjusted to 1:1.2:1.2 and pH was elevated to 9.0.The absorbance measurement was used to trace the process of struvite crystallization.Wastewater and precipitate analysis was done by standard analytical methods. Results The pH constant experiment reported a significantly higher struvite precipitation (24.6±0.86 g) than the non-constant pH experiment (19.8±1.86 g).The SAR ranged from 5.6 to 8.2 g m-2h-1 to 3.6-4.8 g m-2h-1 in pH constant and non-constant experiments,respectively.The highest struvite deposit on the device was found in regime 3 followed by in regimes 2 and 4.The highest PO43-(97.2%) and NH4+ (71%) removal was reported in the Ri regime.None of the influent Cu2+ or Zn2+ was precipitated on the device. Conclusion A higher struvite yield is evident in pH constant experiments.Moreover,the stainless steel device facilitates the isolation of heavy metal free pure (around 96%) struvite from swine waste biogas digester effluent contaminated with cu2+ and Zn2+ and the highest yield is attainable with the device operating at 50 rpm with agitation by a magnetic stirrer.
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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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Struvite Recovery from Swine Waste Biogas Digester Effluent through a Stainless Steel Device under Constant pH Conditions

Funds:  国家重点基础研究发展规划(973计划)(2002CB410807)%key Project of Science and Technology of Zhejiang Province(021103723)

Abstract: Objective To investigate the struvite precipitation under constant and non-constant pH conditions and to test a stainless steel device under different operating regimes to maximize the recovery of struvite. Methods The molar ratio of NH4+:Mg2+:PO43- was adjusted to 1:1.2:1.2 and pH was elevated to 9.0.The absorbance measurement was used to trace the process of struvite crystallization.Wastewater and precipitate analysis was done by standard analytical methods. Results The pH constant experiment reported a significantly higher struvite precipitation (24.6±0.86 g) than the non-constant pH experiment (19.8±1.86 g).The SAR ranged from 5.6 to 8.2 g m-2h-1 to 3.6-4.8 g m-2h-1 in pH constant and non-constant experiments,respectively.The highest struvite deposit on the device was found in regime 3 followed by in regimes 2 and 4.The highest PO43-(97.2%) and NH4+ (71%) removal was reported in the Ri regime.None of the influent Cu2+ or Zn2+ was precipitated on the device. Conclusion A higher struvite yield is evident in pH constant experiments.Moreover,the stainless steel device facilitates the isolation of heavy metal free pure (around 96%) struvite from swine waste biogas digester effluent contaminated with cu2+ and Zn2+ and the highest yield is attainable with the device operating at 50 rpm with agitation by a magnetic stirrer.

P.W.ANTON PERERA, WEI-XIANG WU, YING-XU CHEN, ZHI-YING HAN. Struvite Recovery from Swine Waste Biogas Digester Effluent through a Stainless Steel Device under Constant pH Conditions[J]. Biomedical and Environmental Sciences, 2009, 22(3): 201-209.
Citation: P.W.ANTON PERERA, WEI-XIANG WU, YING-XU CHEN, ZHI-YING HAN. Struvite Recovery from Swine Waste Biogas Digester Effluent through a Stainless Steel Device under Constant pH Conditions[J]. Biomedical and Environmental Sciences, 2009, 22(3): 201-209.

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