Use of magnesit as a magnesium source for ammonium removal from leachate

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• 作者：Ahmet Gunay ; Dogan Karadag ; Ismail Tosun ; Mustafa Ozturk
• 关键词：Struvite ; Ammonium removal ; Magnesit ; Leachate
• 刊名：Journal of Hazardous Materials
• 出版年：2008
• 期刊代码：50_03043894
• 类别：ce
• 出版时间：15 August 2008
• 卷：156
• 期：1-3
• 页码：619-623
• 文件大小：338 K

摘要

Using magnesit (MgCO₃) as a low cost source of magnesium ions in the struvite precipitation for the removal of high ammonium content of leachate was evaluated. Optimum molar concentration and pH conditions were analyzed to minimize the struvite solubility. Since solubility of magnesit in water is low, HCl was used to obtain soluble Mg. Maximum soluble Mg was obtained for the addition of 2 M HCl to the 1 M MgCO₃. Struvite precipitation with magnesit was effective for the removal of ammonium, suspended solid, phosphate and turbidity. Economical evaluation was made comparing the costs of two magnesium sources, MgCl₂ and MgCO₃. The economical analysis has shown that operation cost of struvite precipitation can be reduced about 18%by using MgCO₃ instead of MgCl₂. High salt concentration after struvite precipitation has no inhibitory effect on the anaerobic reactor performance.