Biotransformation of p-toluic acid in anoxic estuarine sediments under a CO2 or N2/H2 atmosphere

Kuo, Cheng-Lung; Chi, Wanqing; Liu, S.-M.

doi:10.1016/s0045-6535(01)00098-4

Cited by 6 publications

(4 citation statements)

References 17 publications

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“…[24] The organic carbon (%) and carbon/nitrogen (atomic ratio) of the sediment were 2.71 and 32.25, respectively as measured by CHN analyzer after acidification. [24] The organic carbon (%) and carbon/nitrogen (atomic ratio) of the sediment were 2.71 and 32.25, respectively as measured by CHN analyzer after acidification.…”

Section: Sediment Collection and Treatmentmentioning

confidence: 98%

“…Following on from a recent article, [24] in which we found the growth dynamics of microbial populations were different in anoxic estuarine sediment under different headspace gases, in the present study we investigate the effect of CO 2 and H 2 on the anaerobic biotransformation of toluic acid isomers. Most Probable Number (MPN) tests were then used to check the involvement of acetogenic bacteria during the biotransformation of p-toluic acid in anoxic sediment slurries.…”

Section: Introductionmentioning

confidence: 99%

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Effects of the Headspace Gas Composition on Anaerobic Biotransformation ofo-,m-, andp-Toluic Acid in Sediment Slurries

Liu

Chi

2003

Journal of Environmental Science and Health, Part A

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Composition of the headspace gas affected the biotransformation pattern of toluic acid isomers in anoxic sediment slurries. Under an N2 atmosphere, o- and m-, and p-toluic acid (20-25 mg L(-1)) were biotransformed in 100 days, 77 days, and 148 days, respectively, with a lag period of 50 days, 49 days, and 50 days, respectively. Under a CO2 atmosphere, the same toluic acid isomers were biotransformed by the sediment microorganisms in 16-25 days without a lag period. CO2 thus increased the biotransformation rates. The presence of H2, on the other hand, decreased the biotransformation rates: in most cases, adding H2 gas (5% and 20% to the N2 and CO2 atmospheres, respectively) not only increased the lag period but also decreased the maximum biotransformation rates. These effects were especially noticeable for the N2 atmosphere. Under N2, the maximum biotransformation rates of the toluic acid isomers were in the order o-toluic acid > m-toluic acid > p-toluic acid. However, under CO2, the maximum biotransformation rates were reversed, i.e., p-toluic acid > m-toluic acid > o-toluic acid. The presence of the methanogen inhibitor bromoethanesulfonic acid (BESA) slowed the biotransformation rates of p-toluic acid, and this together with the population dynamics of the acetogenic bacteria in the sediment slurries, suggested that acetogenic bacteria were involved in the degradation pathway. However, their exact role remains unclear.

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Section: Sediment Collection and Treatmentmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Effects of the Headspace Gas Composition on Anaerobic Biotransformation ofo-,m-, andp-Toluic Acid in Sediment Slurries

Liu

Chi

2003

Journal of Environmental Science and Health, Part A

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“…Second, PBAT is less mechanically strong than conventional non-biodegradable plastics, which impedes its marketability. Third, the terephthalic acid (TPA) manufacturing process has been reported to heavily contaminate the environment. − …”

Section: Introductionmentioning

confidence: 99%

Sustainable Poly(butylene adipate-co-furanoate) Composites with Sulfated Chitin Nanowhiskers: Synergy Leading to Superior Robustness and Improved Biodegradation

Thanh

Hào

Cho

et al. 2022

ACS Sustainable Chem. Eng.

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Plastic waste accumulation is a current societal crisis. Although replacing nondegradable plastics with biodegradable alternatives is one solution to this problem, conventional biodegradable plastics have low mechanical performance and require fastidious decomposition conditions. Consequently, fulfilling the industrial requirements of processability, end-use applicability, and post-use biodegradability is difficult. Therefore, integrating mechanical robustness and enhanced degradability into a single material is critical. Herein, we introduce a fully biomass-derived poly(butylene adipate-co-furanoate) (PBAF) composite with sulfated chitin nanowhiskers prepared by in situ polymerization. This approach efficiently disperses the nanofiller in the polymer matrix and creates beneficial interactions between the nanofiller and the furan rings of the polymer, resulting in excellent material properties. A PBAF composite film loaded with 0.1 wt % nanofiller is as strong as a nondegradable engineering plastic (i.e., poly(ethylene terephthalate)) and exhibits higher tensile strength (1.6-fold), tear toughness (1.4-fold), and degradation rate (1.7-fold) than neat PBAF. A structure–performance relationship study revealed that the nanofiller is accommodated close to the furan rings of the polymer, which results in noticeable segmental mobility and structural change, whereas the benzene rings of conventional poly(butylene adipate-co-terephthalate) show negligible change due to its sturdy crystalline phase. The developed all-organic composite is a sustainable alternative to conventional plastics.

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“…It was concluded that humic substances might significantly contribute to the intrinsic bioremediation of anaerobic sites contaminated with priority pollutants by serving as terminal electron acceptors. Biotransformation of p-toluic acid in anoxic estuarine sediments under a CO 2 or nitrogen/hydrogen (N 2 /H 2 ) atmosphere was investigated (Kuo et al, 2001). Under the CO 2 atmosphere, sulfate-reducing bacteria was involved in the biotransformation, while under N 2 /H 2 , both sulfate-reducing bacteria and other eubacteria were involved.…”

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confidence: 99%

Hazardous Waste Treatment Technologies

Khan¹,

Huang²,

Reed³

2001

Water Environment Research

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This review focuses on hazardous waste treatment technologies published in 2001 and consists of two main parts: (1) biological treatment and (2) physical and chemical treatment. BIOLOGICAL TREATMENT Aerobic Processes. Substrate interactions in benzene, toluene, ethyl benzene, and xylene (BTEX) and methyl tert-butyl ether (MTBE) mixtures by an MTBE-degrading isolate, PM1 were studied (Deeb et al., 2001). BTEX and MTBE degradation occurred primarily via two independent and inducible pathways. Severe inhibition of MTBE degradation by ethylbenzene and the xylenes and the partial inhibition by benzene and toluene were observed. Hatzinger et al. (2001) evaluated biodegradation of MTBE by the hydrogen-oxidizing bacterium Hydrogenophaga flava ENV735. Growth of ENV735 on MTBE or tert-butyl alcohol (TBA) as sole sources of carbon and energy was greatly enhanced by the addition of a small amount of yeast extract while the supplement of hydrogen gas (H 2 ) did not affect MTBE degradation by the strain. MTBE degradation activity was constitutively expressed in ENV735 and was not greatly affected by formaldehyde, carbon monoxide, allyl thiourea, or acetylene but was inhibited by 1amino benzotriazole and butadiene monoepoxide. Kane et al. (2001) studied the potential for aerobic MTBE degradation with microcosms containing aquifer sediment and groundwater from four MTBE-contaminated sites characterized by oxygen-limited in situ conditions. The effects of oxygen and water-soluble gasoline components on in situ MTBE degradation varied from site to site and phylogenetic analysis might be a promising predictor of MTBE biodegradation potential. Liu et al. (2001a) reported that Arthrobacter bacteria demonstrated MTBE degradation activity when grown on butane but not when grown on glucose, butanol, or tryptose phosphate broth. The presence of butane, tert-butyl alcohol, or acetylene had an adverse impact on the MTBE degradation rate. Neither Methylosinus trichosporium OB3b nor Streptomyces griseus was able to cometabolize MTBE. Pruden et al. (2001) developed five aerobic Literature Review 2002 3 examined (Fava and Di Gioia, 2001). A substantial decrease of soil ecotoxicity was observed in SL-supplemented microcosms and SL was found to be a good carbon source for both indigenous and ECO3 bacteria, as well as a product capable of enhancing the PCB bioavailability in the microcosms. Kim and Picardal (2001) isolated bacterial strains, SK-3 and SK-4, capable of aerobic growth on ortho-substituted dichlorobiphenyls as sole carbon and energy sources. During growth on 2,2'dichlorobiphenyl and 2,4'-dichlorobiphenyl strain SK-4 produced stoichiometric amounts of 2-chlorobenzoate and 4-chlorobenzoate which were not formed when strain SK-3 was grown on 2,4'-dichlorobiphenyl. Zhoa and Ward (2001) studied substrate selectivity of a 3-nitrophenol-induced metabolic system in Pseudomonas putida 2NP8 transforming nitroaromatic compounds into ammonia under aerobic conditions. All of the 30 monoor dinitroaromatic substrates except 4-nitrophenol, 2,4-dinit...

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Biotransformation of p-toluic acid in anoxic estuarine sediments under a CO2 or N2/H2 atmosphere

Cited by 6 publications

References 17 publications

Effects of the Headspace Gas Composition on Anaerobic Biotransformation ofo-,m-, andp-Toluic Acid in Sediment Slurries

Effects of the Headspace Gas Composition on Anaerobic Biotransformation ofo-,m-, andp-Toluic Acid in Sediment Slurries

Sustainable Poly(butylene adipate-co-furanoate) Composites with Sulfated Chitin Nanowhiskers: Synergy Leading to Superior Robustness and Improved Biodegradation

Hazardous Waste Treatment Technologies

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