Anaerobic Degradation of Linear Alkylbenzene Sulfonate

Mogensen, Anders S.; Haagensen, Frank; Ahring, Birgitte Kiær

doi:10.1897/1551-5028(2003)022<0706:adolas>2.0.co;2

Cited by 10 publications

(17 citation statements)

References 16 publications

(20 reference statements)

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“…Our findings of 40-80% LAS removal in the UASB reactors are consistent with reported values in the range of 37-85% (Mogensen, 2001;Mogensen and Ahring, 2002;Mogensen et al, 2003;Sanz et al, 2003). Mogensen (2001) has furthermore reported that LAS are more efficiently removed in thermophilic compared with mesophilic UASB reactors.…”

Section: Discussionsupporting

confidence: 93%

“…Although anaerobic LAS degradation has been reported, metabolic pathways are not yet understood. The limited information so far indicates that (1) LAS can be used as a source of sulfur by anaerobic bacteria under sulfur limited conditions (Denger and Cook, 1999), and (2) benzenesulfonic acid and benzaldehyde may be produced as metabolites during anaerobic LAS degradation Mogensen et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

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Effects of process stability on anaerobic biodegradation of LAS in UASB reactors

Lobner¹,

Toräng²,

Batstone³

et al. 2005

Biotech & Bioengineering

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Anaerobic biodegradation of linear alkylbenzene sulfonates (LAS) was studied in upflow anaerobic sludge blanket (UASB) reactors operated under mesophilic (37 degrees C) and thermophilic (55 degrees C) conditions. LAS C12 concentration in the influents was 10 mg.L(-1), and the hydraulic retention time in the reactors was 2 days. Adsorption of LAS C12 was assessed in an autoclaved control reactor and ceased after 115 days. The reactors were operated for a minimum of 267 days; 40-80% removal of LAS C12 was observed. A temperature reduction from 55 degrees C to 32 degrees C for 30 h resulted in process imbalance as indicated by increase of volatile fatty acids (VFA). The imbalance was much more intense in the LAS amended reactor compared with an unamended reactor. At the same time, the process imbalance resulted in discontinued LAS removal. This finding indicates that process stability is a key factor in anaerobic biological removal of LAS. After a recovery period, the removal of LAS resumed, providing evidence of biological anaerobic LAS degradation. The removal remained constant until termination of experiments in the reactor. Biodegradation of LAS in the mesophilic reactor was at the same level as in the thermophilic reactor under stable conditions.

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Section: Discussionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Effects of process stability on anaerobic biodegradation of LAS in UASB reactors

Lobner¹,

Toräng²,

Batstone³

et al. 2005

Biotech & Bioengineering

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“…Many works have been done to confirm the complete biodegradability of LAS (Almendariz et al 2001;Sanz et al 2003;Mogensen et al 2003;Lobner et al 2005). Anaerobic degradation requires a consortium of bacteria that act on different parts of the molecule.…”

Section: Introductionmentioning

confidence: 99%

“…Anaerobic degradation requires a consortium of bacteria that act on different parts of the molecule. For example, the biodegradation of LAS requires alteration of an alkyl chain, a benzene ring and a sulfonate linkage (Mogensen et al 2003).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the microbial diversity in a horizontal-flow anaerobic immobilized biomass reactor treating linear alkylbenzene sulfonate

et al. 2007

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The purpose of this work was to assess the degradation of linear alkylbenzene sulfonate (LAS) in a horizontal-flow anaerobic immobilized biomass (HAIB) reactor. The reactor was filled with polyurethane foam where the sludge from a sanitary sewage treatment was immobilized. The hydraulic detention time (HDT) used in the experiments was of 12 h. The reactor was fed with synthetic substrate (410 mg l(-1) of meat extract, 115 mg l(-1) of starch, 80 mg l(-1) of saccharose, 320 mg l(-1) of sodium bicarbonate and 5 ml l(-1) of salt solution) in the following stages of operation: SI-synthetic substrate, SII-synthetic substrate with 7 mg l(-1) of LAS, SIII-synthetic substrate with 14 mg l(-1) of LAS and SIV-synthetic substrate containing yeast extract (substituting meat extract) and 14 mg l(-1) of LAS, without starch. At the end of the experiment (313 days) a degradation of approximately 35% of LAS was achieved. The higher the concentration of LAS, the greater the amount of foam for its adsorption. This is necessary because the isotherm of LAS adsorption in the foam is linear for the studied concentrations (2 to 50 mg l(-1)). Microscopic analyses of the biofilm revealed diverse microbial morphologies, while Denaturing Gradient Gel Eletrophoresis (DGGE) profiling showed variations in the population of total bacteria and sulphate-reducing bacteria (SRB). The 16S rRNA gene sequencing and phylogenetic analyses revealed that the members of the order Clostridiales were the major components of the bacterial community in the last reactor operation step.

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“…Thus, evidence of LAS biodegradation without oxygen has been found when anaerobic treatment is preceded by aerobic exposure (Larson et al 1993). Mogensen et al (2003), have reported the anaerobic biodegradation of LAS by granular sludge using UASB reactors. In addition, desulfonation of LAS has been reported to occur by anaerobic bacteria in the laboratory (Denge & Cook 1999).…”

Section: Introductionmentioning

confidence: 99%

Inhibition of Biogas Production by Alkyl Benzene Sulfonates (LAS) in a Screening Test for Anaerobic Biodegradability

et al. 2006

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The effect of the inoculum source on the digestion of linear alkylbenzene sulfonates (LAS) under anaerobic conditions has been investigated. The potential for primary and ultimate LAS biodegradation of anaerobic sludge samples obtained from wastewater treatment plants (WWTPs) of different geographical locations was studied applying a batch test system. It was found that only 4-22% of the LAS added to the batch anaerobic digesters was primarily transformed suggesting a poor primary degradation of the LAS molecule in anaerobic discontinuous systems. Regarding ultimate biodegradation, the addition of LAS to the batch anaerobic digesters caused a reduction on the extent of biogas production. Significant differences in the inhibition extent of the biogas production were observed (4-26%) depending on the sludge used as inoculum. Effect of the surfactant on the anaerobic microorganisms was correlated with its concentration in the aqueous phase. Sorption of LAS on anaerobic sludge affects its toxicity by depletion of the available fraction of the surfactant. LAS content on sludge was related to the total amount of calcium and magnesium extractable ions. The presence of divalent cations promote the association of LAS with anaerobic sludge reducing its bioavailability and the extent of its inhibitory effect on the biogas production.

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Anaerobic Degradation of Linear Alkylbenzene Sulfonate

Cited by 10 publications

References 16 publications

Effects of process stability on anaerobic biodegradation of LAS in UASB reactors

Effects of process stability on anaerobic biodegradation of LAS in UASB reactors

Evaluation of the microbial diversity in a horizontal-flow anaerobic immobilized biomass reactor treating linear alkylbenzene sulfonate

Inhibition of Biogas Production by Alkyl Benzene Sulfonates (LAS) in a Screening Test for Anaerobic Biodegradability

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