Phosphate removal in agro-industry: Pilot- and full-scale operational considerations of struvite crystallization

WATER RESEARCH

卷:43

Article

Moerman, Wim²  Carballa, Marta¹  Vandekerckhove, Andy³  Derycke, Dirk⁴ 

[1] Univ Ghent, Lab Microbial Ecol & Technol LabMET, Fac Biosci Engn, B-9000 Ghent, Belgium

[2] Akwadok, B-8540 Deerlijk, Belgium

[3] Clarebout Potatoes NV, B-8950 Nieuwkerke, Belgium

[4] Biotim, B-2830 Willebroek, Belgium

关键词: Anaerobic effluent;    Calcium;    Magnesium ammonium phosphate;    Phosphorus recovery;   

DOI  :  10.1016/j.watres.2009.02.007

来源: Elsevier

【 摘 要 】

Pilot-scale struvite crystallization tests using anaerobic effluent from potato processing industries were performed at three different plants. Two plants (P1 & P2) showed high phosphate removal efficiencies, 89 +/- 3% and 75 +/- 8%, resulting in final effluent levels of 12 +/- 3 mg PO43--P L-1 and 11 +/- 3 mg PO43--P L-1, respectively. In contrast, poor phosphate removal (19 8%) was obtained at the third location (P3). Further investigations at P3 showed the negative effect of high Ca2+/PO43--P molar ratio (ca. 1.25 +/- 0.11) on struvite formation. A full-scale struvite plant treating anaerobic effluent from a dairy industry showed the same Ca2+ interference. A shift in the influent Ca2+/PO43--P molar ratio from 2.69 to 1.36 resulted in average total phosphorus removal of 78 +/- 7%, corresponding with effluent levels of 14 +/- 4 mg P-total L-1 (9 +/- 3 mg PO43--P L-1). Under these conditions high quality spherical struvite crystals of 2-6 mm were produced. (C) 2009 Elsevier Ltd. All rights reserved.

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