Nitrogen recovery from wastewater using gas-permeable membranes: Impact of inorganic carbon content and natural organic matter

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Title: Nitrogen recovery from wastewater using gas-permeable membranes: Impact of inorganic carbon content and natural organic matter
Authors: Daguerre-Martini, Silvana | Vanotti, Matias B. | Rodríguez Pastor, Manuel | Rosal, Antonio | Moral, Raúl
Research Group/s: Recursos Hídricos y Desarrollo Sostenible
Center, Department or Service: Universidad de Alicante. Departamento de Ingeniería Química | Universidad de Alicante. Instituto Universitario del Agua y las Ciencias Ambientales
Keywords: Ammonia recovery | Ammonia capture | Gas-permeable membranes | Livestock wastewater | Ammonia emissions control
Knowledge Area: Ingeniería Química
Issue Date: 15-Jun-2018
Publisher: Elsevier
Citation: Water Research. 2018, 137: 201-210. doi:10.1016/j.watres.2018.03.013
Abstract: Gas-permeable membranes coupled with low-rate aeration is useful to recover ammonia (NH4+) from livestock effluents. In this study, the role of inorganic carbon (bicarbonate, HCO3−) to enhance the N recovery process was evaluated using synthetic effluents with various NH4+ to HCO3− molar ratios of 0.5, 1.0, 1.5 and 2.0. The study also evaluated the effect of increased organic matter on the NH4+ recovery using humic acids (3000–6000 mg L−1), and the N recovery from high-strength swine manure. The release of hydroxide from the HCO3− with aeration increased the wastewater pH and promoted gaseous ammonia formation and membrane uptake. At the same time, the recovery of gaseous ammonia (NH3) through the membrane acidified the wastewater. Therefore, an abundant inorganic carbon supply in balance with the NH4+ is needed for a successful operation of the technology. NH4+ removal efficiencies >96% were obtained with NH4+ to HCO3− ratios ≤1. However, higher molar ratios inhibited the N recovery process resulting in lower efficiencies (<65%). Fortunately, most swine manures contain ample supply of endogenous inorganic carbon and the process can be used to more economically recover the ammonia using the natural inorganic carbon instead of expensive alkali chemicals. In 4 days, the recovered NH4+ from swine manure contained 48,000 mg L−1. Finally, it was found the process was not inhibited by the increasing levels of organic matter in the wastewater evaluated.
Sponsor: Co-financed by the Ministry of Economy & Competitiveness of Spain and the European Regional Development Fund (ERDF, “Una manera de hacer Europa”) (Project AGL2013-41612-R). Cooperation with USDA-ARS Project 6082-13630-001-00D “Improvement of Soil Management Practices and Manure Treatment/Handling Systems of the Southern Coastal Plains” is acknowledged.
ISSN: 0043-1354 (Print) | 1879-2448 (Online)
DOI: 10.1016/j.watres.2018.03.013
Language: eng
Type: info:eu-repo/semantics/article
Rights: © Elsevier Ltd.
Peer Review: si
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Appears in Collections:INV - Recursos Hídricos y Desarrollo Sostenible - Artículos de Revistas

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