期刊
WATER RESEARCH
卷 35, 期 17, 页码 4191-4199出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0043-1354(01)00143-9
关键词
phosphorus removal; precipitation; recycling; struvite; wastewater treatment; biological nutrient removal
Struvite precipitation in wastewater treatment works has caused substantial operational problems since the early 1960s. Struvite, magnesium ammonium phosphate hexahydrate (MgNH4PO4. 6H(2)O). is a white inorganic crystalline mineral that precipitates in places with increased turbulence such as pumps, aerators and pipe bends. Batch experiments were conducted to examine the influence of a number of physical and chemical parameters on struvite crystallisation. This was undertaken by dosing a medium of de-ionised water with varying concentrations of Mg2+, NH4+ and PO43- ions. Preliminary experiments found that struvite could be precipitated out of solution at PH 10 and increasing the ion concentration stoichiometrically could increase crystal yield. Increasing the NH4+ concentration increased purity of the precipitate. As reaction time was increased from I to 180 min, crystal size was found to increase from 0.1 to 3 mm. (C) 2001 Elsevier Science Ltd. All rights reserved.
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