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Removal of Organic Pollutants from Wastewater Using Wood Fly Ash as a Low-Cost Sorbent
Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.
Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.ORCID iD: 0000-0002-7920-8001
Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.ORCID iD: 0000-0002-1903-760X
2010 (English)In: CLEAN - Soil, Air, Water, ISSN 1863-0650, E-ISSN 1863-0669, Vol. 38, no 11, 1055-1061 p.Article in journal (Refereed) Published
Abstract [en]

In this study untreated and treated wood fly ash (WA) was used as a low cost sorbent in batch sorption tests to investigate the removal of organic pollutants from a real wastewater generated by cleaning/washing of machinery in a wood laminate floor industry in Sweden The experiments focused on the effect of the WA dosage and particle size on the removal efficiency for organic compounds With a WA dosage of 160 g L-1 and a particle size less thin 1 mm the reductions of chemical oxygen demand (COD) biologic oxygen demand and total organic carbon were 37 +/- 0 4 24 +/- 0 4 and 30 +/- 0 3% respectively Pre treatment of WA with hot water improved the COD removal efficiency by absorption from 37 +/- 0 4 to 42 +/- 1 6% when the same dosage (160 g L-1) was applied Sorption isotherm and sorption kinetics for COD using untreated WA can be explained by Freundlich isotherm and pseudo-second-order kinetic models Intra particle diffusion model indicates that pore diffusion is not the rate limiting step for COD removal Based on the experimental data WA could be used as an alternative low cost sorption media/filter for removal of organic compounds from real industrial wastewater.

Place, publisher, year, edition, pages
2010. Vol. 38, no 11, 1055-1061 p.
National Category
Environmental Sciences
Research subject
Natural Science, Environmental Science
Identifiers
URN: urn:nbn:se:lnu:diva-25294DOI: 10.1002/clen.201000105ISI: 000285165000009Scopus ID: 2-s2.0-78649550732OAI: oai:DiVA.org:lnu-25294DiVA: diva2:615618
Available from: 2013-04-11 Created: 2013-04-11 Last updated: 2017-12-06Bibliographically approved
In thesis
1. Wastewater generated by the wooden floor industry: Treatability investigation applying individual and coupled technologies
Open this publication in new window or tab >>Wastewater generated by the wooden floor industry: Treatability investigation applying individual and coupled technologies
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

During the last half-century a growing concern has taken place in the world regarding water shortage and public health associated to water pollution. Safe discharges of industrial effluents and water reuse within the industry have been encouraged and several initiatives have promoted the development of wastewater treatment technologies with the main focus on industrial sectors that generate large volumes of wastewater. On the other hand, searching for onsite technological options to treat small volumes of highly polluted wastewaters generated by industrial sectors that have no water in their production processes (i.e. wooden floor and furniture industry) has been neglected. To minimize and prevent environmental effects through innovative approaches, onsite treatment options for wastewater generated by cleaning/washing activities in a wooden floor industry in Sweden have been investigated. It was found that different wastewater streams generated after cleaning/washing of machinery and surfaces at different stages of the wooden floor production can pose negative effects to aquatic organisms. Since they are intermittently and manually generated, these wastewater streams have high variability both in volumes and chemical composition. During treatability studies, equalization/sedimentation process was found to be an important pre-treatment step responsible for reduction of chemical oxygen demand (COD) of about 19%. Sorption/filtration with activated carbon and anaerobic biological treatment were found to be technically feasible for both COD and formaldehyde removal. Wood fly ash (waste material with negligible cost) showed moderate sorption efficiency as compared to commercial activated carbon and leaching of secondary pollutants might prevent the use of this material unless pretreatment is carried out. In the anaerobic treatment process, the treatment efficiency of COD in an anaerobic baffled reactor  (ABR) was decreased 50% when the C/N ratio dropped below 3. A successful treatment of the cleaning wastewater with soluble COD removal of about 83% and FA removal higher than 99% was achieved by the ABR operated with hydraulic retention time (HRT) of 5 days. Mole ratio of Mg:N:P and pH were key parameters for ammonium precipitation in the wastewater. At Mg:N:P of 1:1:1 or higher and pH of 8.0, the highest ammonium removal (83%) was achieved. Combinations of treatment processes (e.g. sorption and electrocoagulation or biological treatment and chemical precipitation) improved the quality of the final effluent. However, process optimization is still required in order to improve even more the quality of the final effluent and reduce operation and maintenance costs. From the water reuse/recycle perspective, the application of advanced oxidation in combination with the above-mentioned processes seems to be a promising approach.

Place, publisher, year, edition, pages
Växjö: Linnaeus University Press, 2013
Series
Linnaeus University Dissertations, No 135/2013
Keyword
Wooden floor industry, activated carbon sorption/filtration, anaerobic biological treatment, chemical precipitation, electrocoagulation, ecotoxicity
National Category
Natural Sciences
Research subject
Natural Science, Environmental Science; Environmental Science, Environmental technology
Identifiers
urn:nbn:se:lnu:diva-25300 (URN)978-91-97427-28-2 (ISBN)
Public defence
2013-05-23, Fullriggaren (B135), Barlastgatan 11, 392 31, Kalmar, 09:30 (English)
Opponent
Supervisors
Available from: 2013-05-23 Created: 2013-04-11 Last updated: 2014-03-05Bibliographically approved

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Laohaprapanon, SawanyaMarques, MarciaHogland, William

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