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Anaerobic baffled reactor coupled with chemical precipitation for treatment and toxicity reduction of industrial wastewater
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
Rio de Janeiro State University, Brazil.ORCID iD: 0000-0002-7920-8001
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.ORCID iD: 0000-0002-1903-760X
2014 (English)In: Environmental technology, ISSN 0959-3330, E-ISSN 1479-487X, Vol. 35, no 2, p. 154-162Article in journal (Refereed) Published
Abstract [en]

This study describes the reduction of soluble chemical oxygen demand (CODs) and the removal of dissolved organic carbon (DOC), formaldehyde (FA) and nitrogen from highly polluted wastewater generated during cleaning procedures in wood floor manufacturing using a laboratory-scale biological anaerobic baffled reactor followed by chemical precipitation using MgCl2·6H2O+Na2HPO4. By increasing the hydraulic retention time from 2.5 to 3.7 and 5 days, the reduction rates of FA, DOC and CODs of nearly 100%, 90% and 83%, respectively, were achieved. When the Mg:N:P molar ratio in the chemical treatment was changed from 1:1:1 to 1.3:1:1.3 at pH 8, the NH4+ removal rate increased from 80% to 98%. Biologically and chemically treated wastewater had no toxic effects on Vibrio fischeri and Artemia salina whereas chemically treated wastewater inhibited germination of Lactuca sativa owing to a high salt content. Regardless of the high conductivity of the treated wastewater, combined biological and chemical treatment was found to be effective for the removal of the organic load and nitrogen, and to be simple to operate and to maintain. A combined process such as that investigated could be useful for on-site treatment of low volumes of highly polluted wastewater generated by the wood floor and wood furniture industries, for which there is no suitable on-site treatment option available today.

Place, publisher, year, edition, pages
2014. Vol. 35, no 2, p. 154-162
Keywords [en]
anaerobic baffled reactor, magnesium ammonium phosphate, toxicity assessment, ammonia removal, urea-formaldehyde wastewater
National Category
Engineering and Technology
Research subject
Environmental Science, Environmental technology
Identifiers
URN: urn:nbn:se:lnu:diva-31133DOI: 10.1080/09593330.2013.821142ISI: 000328469200004Scopus ID: 2-s2.0-84897571734OAI: oai:DiVA.org:lnu-31133DiVA, id: diva2:677616
Funder
Knowledge FoundationAvailable from: 2013-12-10 Created: 2013-12-10 Last updated: 2017-12-06Bibliographically approved

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Laohaprapanon, SawanyaMarques, MarciaHogland, William

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