Ammonia removal from landfill leachate by struvite formation: an alarming concentration of phosphorus in the treated effluent.

Autor: Tonetti AL; School of Civil Engineering, Architecture and Urban Design - FEC, UNICAMP (University of Campinas), Cidade Universitária 'Zeferino Vaz', Rua Saturnino de Brito, 224, P.O. Box 6143, 13083-889, Campinas, SP, Brazil E-mail: adriano@fec.unicamp.br., de Camargo CC; School of Civil Engineering, Architecture and Urban Design - FEC, UNICAMP (University of Campinas), Cidade Universitária 'Zeferino Vaz', Rua Saturnino de Brito, 224, P.O. Box 6143, 13083-889, Campinas, SP, Brazil E-mail: adriano@fec.unicamp.br., Guimarães JR; School of Civil Engineering, Architecture and Urban Design - FEC, UNICAMP (University of Campinas), Cidade Universitária 'Zeferino Vaz', Rua Saturnino de Brito, 224, P.O. Box 6143, 13083-889, Campinas, SP, Brazil E-mail: adriano@fec.unicamp.br.
Jazyk: angličtina
Zdroj: Water science and technology : a journal of the International Association on Water Pollution Research [Water Sci Technol] 2016 Dec; Vol. 74 (12), pp. 2970-2977.
DOI: 10.2166/wst.2016.490
Abstrakt: This study examined the removal of ammonia nitrogen from the leachate of a landfill site using the chemical precipitation of struvite (MgNH 4 PO 4 .6H 2 O). This procedure achieved a reduction in the ammonia concentration that was higher than 99% when the molar ratio of 1.8:1.0:1.4 for Mg 2 + :NH 4 + :PO 4 3- was adopted. The metal concentration found in the precipitate formed was lower than the limits set by Brazilian and American regulations (CONAMA 375/2006 and US EPA, 40 CFR 503.1993). This demonstrates the potential use for this practice in agriculture. However, the effluent obtained from the tests presented a phosphorus concentration higher than the one in the raw leachate. This shows that removing this compound from the effluent must be further studied. Otherwise, adopting the chemical precipitation of ammonia by the formation of struvite may become unfeasible.
Databáze: MEDLINE
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