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Östberg, Tomas
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Publications (6 of 6) Show all publications
Östberg, T., Jonsson, A. & Lundström, U. (2007). Enhanced degradation of n-hexadecane in diesel fuel contaminated soil by the addition of fermented whey. Soil & sediment contamination: an international journal, 16(2), 221-232
Open this publication in new window or tab >>Enhanced degradation of n-hexadecane in diesel fuel contaminated soil by the addition of fermented whey
2007 (English)In: Soil & sediment contamination: an international journal, ISSN 1532-0383, Vol. 16, no 2, p. 221-232Article in journal (Refereed) Published
Abstract [en]

The objective of this work has been to investigate the possibility of using fermented whey as an organic growth supplement in order to enhance the aerobic degradation of n-hexadecane in soil. Fermented whey was added at different dosages to nutrient amended soil microcosms contaminated with 5000 mg diesel fuel kg-1 dry weight (dw). The target substance was 14C-labeled n-hexadecane, and the biodegradation was monitored by analysis of evolved 14CO2. Biodegradation curves were fitted to a three-half-order kinetics model. Enhanced biodegradation was observed in sand at 7 and 22C and in loamy sand at 22C but the effect was most pronounced in the sand soil at 22C. The addition of 6 or 60 ml fermented whey kg-1 soil dw, increased the degree of n-hexadecane biodegradation at the end of the experiment, 167 days, from 49% in the untreated sand to 60 or 67% respectively. This increase in biodegradation was characterized by an increase in the amount of substrate biodegradation by first-order kinetics despite a decrease in the first order rate constant, k1. The highest concentration of fermented whey, 60 ml kg-1, gave rise to substrate competition, diauxie, which resulted in an extended lag phase.

Keywords
Bioavailability, Bioremediation, Organic amendment, Petroleum hydrocarbons, soil
National Category
Chemical Sciences
Identifiers
urn:nbn:se:miun:diva-3858 (URN)10.1080/15320380601169425 (DOI)000244422800006 ()2-s2.0-33847071318 (Scopus ID)4130 (Local ID)4130 (Archive number)4130 (OAI)
Available from: 2008-09-30 Created: 2008-09-30 Last updated: 2016-10-04Bibliographically approved
Östberg, T., Jonsson, A., Bylund, D. & Lundström, U. (2007). The effects of carbon sources and micronutrients in fermented whey on the biodegradation of n-hexadecane in diesel fuel contaminated soil. International Biodeterioration & Biodegradation, 60(4), 334-341
Open this publication in new window or tab >>The effects of carbon sources and micronutrients in fermented whey on the biodegradation of n-hexadecane in diesel fuel contaminated soil
2007 (English)In: International Biodeterioration & Biodegradation, ISSN 0964-8305, E-ISSN 1879-0208, Vol. 60, no 4, p. 334-341Article in journal (Refereed) Published
Abstract [en]

The effect of organic amendments on the biodegradation of n-alkanes and phenanthrene in diesel contaminated soil was evaluated. The organic amendments used were fermented and non fermented sweet milk whey and the mineralization was estimated by analysis of evolved 14CO from added 14C-hexadecane, 14C-octadecane and 14C-phenanthrene. The addition of 2100 mg dry weight (dw) sweet whey kg-1 soil dw at the start of the experiment increased the extent of mineralization after 184 days compared to a control, from 45 % to 61 % for n-hexadecane and from 35 % to 46 % for n-octadecane. The stimulation was characterized according to a three-half-order kinetic such as if a greater part of the substrates was mineralized according to first order kinetics. Similar stimulation was achieved from the fermented whey when 210 mg dw kg-1 soil dw was added to the soil every second week during the 184 days of incubation.

Keywords
diesel contaminated soil
National Category
Chemical Sciences
Identifiers
urn:nbn:se:miun:diva-3860 (URN)10.1016/j.ibiod.2007.05.007 (DOI)000251703600019 ()2-s2.0-36049019054 (Scopus ID)4133 (Local ID)4133 (Archive number)4133 (OAI)
Available from: 2008-12-09 Created: 2008-12-09 Last updated: 2017-12-12Bibliographically approved
Östberg, T. L., Jonsson, A. P. & Lundström, U. S. (2006). Accelerated biodegradation of n-alkanes in aqueous solution by the addition of fermented whey. International Biodeterioration & Biodegradation, 57(3), 190-194
Open this publication in new window or tab >>Accelerated biodegradation of n-alkanes in aqueous solution by the addition of fermented whey
2006 (English)In: International Biodeterioration & Biodegradation, ISSN 0964-8305, E-ISSN 1879-0208, Vol. 57, no 3, p. 190-194Article in journal (Refereed) Published
Abstract [en]

The effect of fermented whey on the aerobic degradation of n-alkanes by a microbial consortium was investigated in an aqueous system. Microbial degradation of 100 mg n-alkanes (C12, C14, C16 and C18) in mineral nutrient medium was assessed by measuring the decrease in n-alkanes, production of CO2 and increase in biomass. The addition of fermented whey at a concentration of 5 mg dry weight to a nutrient medium receiving a small-sized inoculum (103.4 CFU ml-1)shortened the lag phase from 8 to 3 days, but the degradation rate during the degradation phase was not enhanced. The shortened lag phase at low initial concentration of microorganisms indicates that the fermented whey stimulates growth in the initial phase, without reducing the consortium's capacity for n-alkane degradation.

Keywords
Fermented whey, Degradation, n-Alkanes, Petroleum hydrocarbons, Mineralization
National Category
Chemical Sciences
Identifiers
urn:nbn:se:miun:diva-3842 (URN)10.1016/j.ibiod.2006.01.006 (DOI)000238401100009 ()2-s2.0-33646561835 (Scopus ID)4095 (Local ID)4095 (Archive number)4095 (OAI)
Available from: 2008-09-30 Created: 2008-09-30 Last updated: 2017-12-12Bibliographically approved
Östberg, T. (2006). Effects of organic amendments on the biodegradation of petroleum hydrocarbons in contaminated soil. (Doctoral dissertation). Sundsvall: Mittuniversitetet
Open this publication in new window or tab >>Effects of organic amendments on the biodegradation of petroleum hydrocarbons in contaminated soil
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Sundsvall: Mittuniversitetet, 2006. p. 40
Series
Mid Sweden University doctoral thesis, ISSN 1652-893X ; 12
National Category
Chemical Sciences
Identifiers
urn:nbn:se:miun:diva-8880 (URN)91-85317-28-4 (ISBN)
Public defence
(English)
Available from: 2009-05-06 Created: 2009-05-06 Last updated: 2011-05-29Bibliographically approved
Östberg, T., Jonsson, A. & Lundström, U. (2005). Enhanced biodegradation of diesel fuel hydrocarbons in soil by the addition of fermented whey.
Open this publication in new window or tab >>Enhanced biodegradation of diesel fuel hydrocarbons in soil by the addition of fermented whey
2005 (English)Conference paper, Published paper (Other academic)
Abstract [en]

Industrial organic byproducts such as whey or fermented whey contain easily accessible carbon and micronutrients which could be used to stimulate microbial degradation of hazardous organic contaminants in soil. In this work we have investigated the possibility to use fermented whey as a growth supplement to enhance the aerobic degradation of diesel fuel hydrocarbons in soil. Experiments were carried out with two soils, a sand soil and a loamy sand soil, contaminated with diesel fuel at a concentration of 5000 mg kg-1 soil dry weight (dw). Fermented whey was added at different dosages to nutrient amended soil microcosms. Petroleum hydrocarbon mineralization was monitored by analysis of evolved 14CO2 from added 14C-labeled n-hexadecane. Mineralization curves were fitted to a three-half-order kinetics model. Enhanced mineralization was observed in sand soil at 7 and 22C and in loamy sand soil at 22C but the stimulatory effect was most pronounced in the sand soil at 22C, where the addition of 6 and 60 ml fermented whey kg-1 soil dw, increased the final degree of n-hexadecane mineralization from 49% in the control soil to 60 and 67% respectively. The increased total mineralization was characterized by an increase in the amount of substrate mineralized by first-order kinetics despite a decrease in the first order rate constant, k1. The highest concentration of fermented whey, 60 ml kg-1, gave rise to substrate competition, diauxie, which resulted in an extended lag phase.

Keywords
Biodegradation, Diesel fuel, Hydrocarbons, Fermented whey
National Category
Chemical Sciences
Identifiers
urn:nbn:se:miun:diva-6270 (URN)3072 (Local ID)3072 (Archive number)3072 (OAI)
Available from: 2011-07-20 Created: 2011-07-20 Last updated: 2012-02-12Bibliographically approved
Östberg, T. L., Jonsson, A. P., Lundström, U. & Bylund, D.Effects of whey addition on the biodegradation of n-hexadecane, n-octadecane and phenanthrene in diesel fuel contaminated soil.
Open this publication in new window or tab >>Effects of whey addition on the biodegradation of n-hexadecane, n-octadecane and phenanthrene in diesel fuel contaminated soil
(English)Manuscript (preprint) (Other academic)
National Category
Other Basic Medicine
Identifiers
urn:nbn:se:miun:diva-9372 (URN)
Available from: 2009-07-13 Created: 2009-07-13 Last updated: 2018-01-13Bibliographically approved
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