Publisher DOI: 10.1111/wej.12210
Title: Combining magnesium ammonium phosphate precipitation with membrane processes for ammonia removal from methanogenic leachates
Authors: Ramaswami, Sreenivasan  
Behrendt, Joachim  
Wang, Ge 
Eggers, Susanne 
Otterpohl, Ralf 
Keywords: chemical precipitation;magnesium ammonium phosphate;methanogenic landfill leachate;nanofiltration;struvite
Issue Date: 1-Sep-2016
Source: Water and Environment Journal 3-4 (30): 218-226 (2016-09-01)
Journal or Series Name: Water and environment journal 
Abstract (english): Chemical precipitation of ammonia as magnesium ammonium phosphate (MAP) from methanogenic leachates can be a competitive alternative to biological ammonia removal. Potential for trading of the precipitate as a fertiliser defines the economics of the process. The precipitate from a landfill leachate often containing organics and heavy metals as impurities with unknown risks limits its possibility for agricultural use. This study combines MAP precipitation with membrane processes and investigates the influence of wastewater matrix, solution pH and dosage ratio of chemicals (Mg2+ : PO43−) on the precipitate purity through lab scale semibatch experiments. Under similar experimental conditions (pH 8.5 and 1 : 1 Mg2+ : PO43− molar dosage), the precipitates from raw leachate and nanofiltration (NF) permeate showed MAP contents of 65 and 90%, respectively, correspondingly with about 8300 and 1600 mg TOC/kgprecipitate. For precipitation from NF permeate, precipitation at pH 8.0 with 1 : 1 dosage ratio and pH 8.5 with 1 : 0.9 dosage ratio gave precipitates each with about 97% purity.
ISSN: 0951-7359
Institute: Abwasserwirtschaft und Gewässerschutz B-2 
Type: (wissenschaftlicher) Artikel
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