Recovery of nitrogen and phosphorous as struvite from swine waste biogas digester effluent.

Biomedical and environmental sciences : BES Pub Date : 2007-10-01

P W Anton Perera, Zhi-Ying Han, Ying-Xu Chen, Wei-Xiang Wu

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Abstract

Objective: To investigate the feasibility of nitrogen and phosphorus recovery from swine waste biogas digester effluent and the effects of pH and NH4+: Mg2+: PO4(3-) 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+: PO4(3-) 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 PO4(3-) were achieved at pH 9.0 in each experiment. The elevation of pH to 9.0 alone could decrease the initial PO4(3-) concentration from 42 mg L(-1) to 4.7 mg L(-1) and 89.2% PO4(3-) recovery was achieved. The pH-molar ratio combination 9.0-1: 1.5: 1.5 effected 76.5% NH4+ and 68.5% PO4(3-) 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 PO4(3-) removal as it recovered over 70% and 97% of the initial NH4+ and PO4(3-), respectively.

Conclusions: Nitrogen and phosphorus can be recovered from biogas digester effluent as struvite.

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从猪废沼气池出水中以鸟粪石形式回收氮磷。

目的:探讨从猪废沼气池出水中回收氮磷的可行性，以及pH和NH4+: Mg2+: PO4(3-)摩尔比对其沉淀的影响。方法:在pH为7.5、8.0、8.5和9.0的条件下，以NH4+: Mg2+: PO4(3-)的摩尔比为1:1 .2:0.08、1:1 . 1和1:1 .5:1.5进行猪粪沼气池出水的沉淀实验。通过化学分析和x射线衍射(XRD)分析确定了沉淀的组成。结果:各实验在pH为9.0时，NH4+和PO4(3-)的去除率和回收率最高。当pH值升高至9.0时，PO4(3-)的初始浓度由42 mg L(-1)降至4.7 mg L(-1)， PO4(3-)回收率达到89.2%。ph -摩尔比组合为9.0- 1:1.5:1.5,NH4+回收率为76.5%，PO4(3-)回收率为68.5%。结果表明，当摩尔比为1:1:1、pH为9.0时，对NH4+和PO4(3-)的去除率分别达到70%和97%以上。结论:沼气池出水中氮磷可以鸟粪石的形式回收。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Biomedical and environmental sciences : BES

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