4.4 Article

Combining magnesium ammonium phosphate precipitation with membrane processes for ammonia removal from methanogenic leachates

Journal

WATER AND ENVIRONMENT JOURNAL
Volume 30, Issue 3-4, Pages 218-226

Publisher

WILEY-BLACKWELL
DOI: 10.1111/wej.12210

Keywords

chemical precipitation; magnesium ammonium phosphate; methanogenic landfill leachate; nanofiltration; struvite

Funding

  1. R.T.S. Rochem Technical Services GmbH, Germany

Ask authors/readers for more resources

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+ : ) on the precipitate purity through lab scale semibatch experiments. Under similar experimental conditions (pH 8.5 and 1 : 1 Mg2+ : 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/kg(precipitate). 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.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.4
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available