Conditions influencing the precipitation of magnesium ammonium phosphate

被引：478

作者：

Stratful, I ^{[1
]}

Scrimshaw, MD ^{[1
]}

Lester, JN ^{[1
]}

机构：

[1] Univ London Imperial Coll Sci Technol & Med, Environm Proc & Water Technol Grp, TH Huxley Sch Environm Earth Sci & Engn, London SW7 2P3, England

来源：

WATER RESEARCH | 2001年 / 35卷 / 17期

关键词：

phosphorus removal; precipitation; recycling; struvite; wastewater treatment; biological nutrient removal;

D O I：

10.1016/S0043-1354(01)00143-9

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

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.

引用

页码：4191 / 4199

页数：9

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