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Packed-Column of Granular Activated Carbons for Removal of Chemical Oxygen Demand from Industrial Wastewater
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.ORCID iD: 0000-0002-7920-8001
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.ORCID iD: 0000-0002-1903-760X
2013 (English)In: CLEAN - Soil, Air, Water, ISSN 1863-0650, E-ISSN 1863-0669, Vol. 41, no 3, 244-250 p.Article in journal (Refereed) Published
Abstract [en]

In the present study, chemical oxygen demand (COD) removal by packed-columns of activated carbon (AC) derived from two different materials (coal activated carbon, CAC and wood activated carbon, WAC) is reported as part of an on-site wastewater treatment system for handling small volumes of wastewater generated at wood-floor industries for which there are no proper on-site treatment options available in the market. The performance of the sorbents, the effect of bed depth (0.19 and 0.57 m) and volumetric load (0.10 and 0.24 m h−1) on the breakthrough curve of sorption systems were studied. The results indicated the feasibility of using both ACs to treat these wastewaters. At the bed depth (0.57 m), volumetric load (0.24 m h−1), and 30% breakthrough, CAC and WAC showed treatment capacity of 40.5 L kg−1 in 250 h and 23.8 L kg−1 in 63 h, respectively. This indicated that CAC requires longer retention times to reach a performance similar to WAC. The experimental data was fit into the bed depth-service time model showing that under the same conditions, CAC had higher maximum sorption capacity (N0) than WAC. Moreover, thermal regeneration at 500°C temperature could be a cost-effective procedure since the reuse of spent AC through such regeneration process for further treatment could still achieve 90% of the initial sorption capacity, reducing then costs for the use of new sorbents and also the need for waste disposal.

Place, publisher, year, edition, pages
2013. Vol. 41, no 3, 244-250 p.
National Category
Environmental Sciences
Research subject
Natural Science, Environmental Science
Identifiers
URN: urn:nbn:se:lnu:diva-25289DOI: 10.1002/clen.201100388ISI: 000315853000006OAI: oai:DiVA.org:lnu-25289DiVA: diva2:615582
Available from: 2013-04-11 Created: 2013-04-11 Last updated: 2016-11-17Bibliographically 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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