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  • 1.
    Forss, Jörgen
    et al.
    Linnaeus University, Faculty of Technology, Department of Building and Energy Technology.
    Pinhassi, Jarone
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Lindh, Markus V.
    Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
    Welander, Ulrika
    Linnaeus University, Faculty of Technology, Department of Building and Energy Technology.
    Microbial diversity in a continuous system based on rice husks for biodegradation of the azo dyes Reactive Red 2 and Reactive Black 52013In: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 130, p. 681-688Article in journal (Refereed)
    Abstract [en]

    In the present study the degradation of two common azo dyes used in dye houses today, Reactive Black 5 and Reactive Red 2 was evaluated in biofilters. In two experiments, bioreactors performed over 80% decolorization at a hydraulic retention time of only 28.4 h with little production of metabolites. Molecular analyses showed a diverse and dynamic bacterial community composition in the bioreactors, including members of the Bacteroidetes, Acinetobacter (Gammaproteobacteria) and Clostridium (Firmicutes) that possess the capacity to reduce azo dyes. Collectively, the results indicate that the development of mixed bacterial communities from natural biomaterials contributes to an efficient and robust degradation performance in bioreactors even at high concentration of dyes.

  • 2.
    Kaczala, Fabio
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.
    Marques, Marcia
    Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.
    Hogland, William
    Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.
    Biotreatability of wastewater generated during machinery washing in a wood-based industry: COD, formaldehyde and nitrogen removal2010In: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 101, no 23, p. 8975-8983Article in journal (Refereed)
    Abstract [en]

    This paper describes biotreatability tests for treating a wastewater stream generated by wood-floorindustries after cleaning and washing of machinery used to apply urea–formaldehyde resins ontowood-fiber boards. A biological system consisting of an anaerobic – intermittently aerated reactor inlab-scale was constructed. Since the investigated wastewater is intermittently generated, the systemwas designed to operate in batch mode. The treatment focused on removal of formaldehyde and COD,as well as the efficiency of nitrification–denitrification. The proposed cheap and relatively simple-tooperatebiological system achieved COD and formaldehyde removal rates of 65 ± 11% and 93 ± 4% respectively.In spite of anaerobic ammonium removal and denitrification, the intermittently-aerated reactorshowed poor performance for nitrification. Therefore, a better understanding of constraints for the processimprovement is necessary. Regardless the constraints faced during the investigation, the proposedsystem can be considered feasible to partially reduce a great amount of biodegradable compounds inurea–formaldehyde-based wastewaters. However, to comply with strict threshold limits for industrialeffluent discharges, the use of biological treatment combined with more advanced processes is neededto achieve a better quality of the final effluent.This paper describes biotreatability tests for treating a wastewater stream generated by wood-floorindustries after cleaning and washing of machinery used to apply urea–formaldehyde resins ontowood-fiber boards. A biological system consisting of an anaerobic – intermittently aerated reactor inlab-scale was constructed. Since the investigated wastewater is intermittently generated, the systemwas designed to operate in batch mode. The treatment focused on removal of formaldehyde and COD,as well as the efficiency of nitrification–denitrification. The proposed cheap and relatively simple-tooperatebiological system achieved COD and formaldehyde removal rates of 65 ± 11% and 93 ± 4% respectively.In spite of anaerobic ammonium removal and denitrification, the intermittently-aerated reactorshowed poor performance for nitrification. Therefore, a better understanding of constraints for the processimprovement is necessary. Regardless the constraints faced during the investigation, the proposedsystem can be considered feasible to partially reduce a great amount of biodegradable compounds inurea–formaldehyde-based wastewaters. However, to comply with strict threshold limits for industrialeffluent discharges, the use of biological treatment combined with more advanced processes is neededto achieve a better quality of the final effluent.

  • 3.
    Kaczala, Fabio
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.
    Marques, Marcia
    Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.
    Hogland, William
    Linnaeus University, Faculty of Science and Engineering, School of Natural Sciences.
    Lead and vanadium removal from a real industrial wastewater by gravitational settling/sedimentation and sorption onto Pinus sylvestris sawdust2009In: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 100, no 1, p. 235-243Article in journal (Refereed)
    Abstract [en]

    Batch sorption with untreated Pinus sylvestris sawdust after settling/sedimentation phase to removevanadium and lead from a real industrial wastewater was investigated using different adsorbent doses,initial pH, and contact time. The development of pH along the sorption test and a parallel investigationof metals release from sawdust in distilled water were carried out. In order to evaluate kinetic parametersand equilibrium isotherms, Lagergren first-order, pseudo-second-order, intra-particle diffusion andFreundlich models were explored. When the initial pH was reduced from 7.4 to 4.0, the sorptionefficiency increased from 32% to 99% for Pb and from 43% to 95% for V. Whereas, V removal was positivelycorrelated with the adsorbent dose, Pb removal was not. The sorption process was best described bypseudo-second-order kinetics. According to Freundlich parameters (Kf and n) sawdust presentedunfavourable intensity for sorption of V.Batch sorption with untreated Pinus sylvestris sawdust after settling/sedimentation phase to removevanadium and lead from a real industrial wastewater was investigated using different adsorbent doses,initial pH, and contact time. The development of pH along the sorption test and a parallel investigationof metals release from sawdust in distilled water were carried out. In order to evaluate kinetic parametersand equilibrium isotherms, Lagergren first-order, pseudo-second-order, intra-particle diffusion andFreundlich models were explored. When the initial pH was reduced from 7.4 to 4.0, the sorptionefficiency increased from 32% to 99% for Pb and from 43% to 95% for V. Whereas, V removal was positivelycorrelated with the adsorbent dose, Pb removal was not. The sorption process was best described bypseudo-second-order kinetics. According to Freundlich parameters (Kf and n) sawdust presentedunfavourable intensity for sorption of V.

  • 4. Sundh, I
    et al.
    Carlsson Juhlin, Helena
    Institutionen för mikrobiologi, SLU.
    Nordberg, A
    Hansson, M
    Mathisen, B
    Effects of glucose overloading on microbial community structure and biogas production in a laboratory-scale anaerobic digester2003In: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 89, no 3, p. 237-243Article in journal (Refereed)
    Abstract [en]

    This study characterizes the response of the microbial communities of a laboratory-scale mesophilic biogas process, fed with a synthetic substrate based on cellulose and egg albumin, to single pulses of glucose overloading (15 or 25 times the daily feed based on VS). The microbial biomass and community structure were determined from analyses of membrane phospholipids. The ratio between phospholipid fatty acids (PLFAs; eubacteria and eucaryotes) and di-ethers (PLEL; archaea) suggested that methanogens constituted 4-8% of the microbial biomass. The glucose addition resulted in transient increases in the total biomass of eubacteria while there were only small changes in community structure. The total gas production rate increased, while the relative methane content of the biogas and the alkalinity decreased. However, the biomass of methanogens was not affected by the glucose addition. The results show that the microbial communities of biogas processes can respond quickly to changes in the feeding rate. The glucose overload resulted in a transient general stimulation of degradation rates and almost a doubling of eubacterial biomass, although the biomass increase corresponded to only 7% of the glucose C added. (C) 2003 Elsevier Science Ltd. All rights reserved.

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