Impacts of heavy metals on 1,2-dichloroethane biodegradation in co-contaminated soil

Olaniran, Ademola O.; Balgobind, Adhika; Pillay, Balakrishna

doi:10.1016/s1001-0742(08)62322-0

Cited by 30 publications

(3 citation statements)

References 35 publications

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“…It is convenient to clarify that the concentrations of Cr(VI) and lindane used in this work were selected based on previous studies by Polti et al [21] who worked with Streptomyces M7 grown in co-contaminated soil with 25 μg kg −1 of lindane (2 mg L −1 in the present work) and 50 mg kg −1 of Cr(VI) (25 mg kg −1 in the present work). The concentrations also correspond to those indicated by different authors in co-contaminated environments, who report concentrations of lindane and Cr(VI) in the order of µg L −1 and mg L −1 , respectively, in different environmental compartments [38]. These levels of contamination are sufficient to produce acute toxicity in animals [39] thus exceeding the levels allowed by Argentinean legislation (10 µg kg −1 for lindane and 8 mg kg −1 for Cr(VI)) [15,37].…”

Section: Cr(vi) Removalsupporting

confidence: 88%

Cr(VI) and lindane removal by Streptomyces M7 is improved by maize root exudates

et al. 2017

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Environmental mixed pollution by both organic and inorganic compounds are detected worldwide. Phytoremediation techniques have been proposed as ecofriendly methods for cleaning up polluted sites. Several studies have demonstrated enhanced dissipation of contaminants at the root-soil interface through an increase in microbial activity caused by the release of plant root exudates (REs). The aim of this study was to evaluate the effectiveness for Cr(VI) and lindane removal by Streptomyces M7 cultured in a co-contaminated system in presence of maize REs. Our results showed when REs were added to the contaminated minimal medium (MM) as the only carbon source, microbial removal of Cr(VI) and lindane increased significantly in comparison to contaminant removal obtained in MM with glucose 1 g L . The maximum removal of 91% of lindane and 49.5% of Cr(VI) were obtained in the co-contaminated system. Moreover, Streptomyces M7 showed plant growth promoting traits which could improve plant performance in contaminated soils. The results presented in this study provide evidence that maize REs improved growth of Streptomyces M7 when REs were used as a carbon source in comparison to glucose. Consequently, lindane and Cr(VI) removal was considerably enhanced making evident the phytoremediation potential of the actinobacteria-plant partnership.

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Section: Cr(vi) Removalsupporting

confidence: 88%

Cr(VI) and lindane removal by Streptomyces M7 is improved by maize root exudates

et al. 2017

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“…E.g., Colin et al (2016) components of the soil (e.g., clay mineral and organic matter), in the present study only slightly more than 50% of chromium added to soil was available to be taken by actinobacteria. Besides, the presence of heavy metals can affect organic biodegradation either inhibiting enzymatic pathways and/or by impacting on the ecology of degrading microorganisms (Amor et al, 2001;Sandrin and Maier, 2003;Olaniran et al, 2009).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Integral use of sugarcane vinasse for biomass production of actinobacteria: Potential application in soil remediation

et al. 2017

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The use of living actinobacteria biomass to clean up contaminated soils is an attractive biotechnology approach. However, biomass generation from cheap feedstock is the first step to ensure process sustainability. The present work reports the ability of four actinobacteria, Streptomyces sp. M7, MC1, A5, and Amycolatopsis tucumanensis, to generate biomass from sugarcane vinasse. Optimal vinasse concentration to obtain the required biomass (more than 0.4 g L) was 20% for all strains, either grown individually or as mixed cultures. However, the biomass fraction recovered from first vinasse was discarded as it retained trace metals present in the effluent. Fractions recovered from three consecutive cycles of vinasse re-use obtained by mixing equal amounts of biomass from single cultures or produced as a mixed culture were evaluated to clean up contaminated soil with lindane and chromium. In all cases, the decrease in pesticide was about 50% after 14 d of incubation. However, chromium removal was statistically different depending on the preparation methodology of the inoculum. While the combined actinobacteria biomass recovered from their respective single cultures removed about 85% of the chromium, the mixed culture biomass removed more than 95%. At the end of the reused vinasse cycle, the mixed culture removed more than 70% of the biological oxygen demand suggesting a proportional reduction in the effluent toxicity. These results represent the first integral approach to address a problematic of multiple contaminations, concerning pesticides, heavy metals and a regionally important effluent like vinasse.

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“…The subsurface is a complex environment where OHRB can not only be challenged by cooccurring organohalogen mixtures, but other organic and inorganic co-contaminants such as heavy metals (e.g. Pb, Cd, Cr, Zn, Cu, Ni) (Bunge et al 2007, Costa and Jesus-Rydin 2001, Olaniran et al 2009, Subramanian et al 2015, (per)chlorate (Wen et al 2017), nitrous oxide (Yin et al 2019) and BTEX (benzene, toluene, ethylbenzene, xylenes) (Chen et al 2014b, Richmond et al 2001. Such co-contaminants normally not considered in studies focusing on dehalogenation may exert inhibitory/toxic effects on reductive dehalogenase (RDase)…”

Section: Future Perspectivesmentioning

confidence: 99%

Microbial transformation of organic and inorganic halogen compounds

Peng¹

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Haloalkanoates are environmental pollutants that can be degraded aerobically by microorganisms producing hydrolytic dehalogenases. However, there is lack of information about anaerobic degradation of haloalkanoates. Genome analysis of Pseudomonas chloritidismutans AW-1 T , a facultative anaerobic chlorate-reducing bacterium, showed presence of two putative haloacid dehalogenase genes, the L-DEX gene and dehI, encoding an L-2-haloacid dehalogenase (L-DEX) and a halocarboxylic acid dehydrogenase (DehI). Hence, we studied concurrent degradation of haloalkanoates and chlorate as a yet unexplored trait of strain AW-1 T. The deduced amino acid sequences of L-DEX and DehI revealed 33−37% and 26−86% similarities with biochemically/structurally characterized L-DEX and D-, DL-2haloacid dehalogenase enzymes, respectively. Physiological experiments confirmed that strain AW-1 T can grow on chloroacetate, bromoacetate and both Land D-α-halogenated propionates with chlorate as an electron acceptor. Interestingly, growth and haloalkanoates degradation were generally faster with chlorate as an electron acceptor than with oxygen. In line with this, analyses of L-DEX and DehI dehalogenase activities using cell free extract (CFE) of strain AW-1 T grown on DL-2-chloropropionate under chlorate-reducing condition showed up to 3.5-fold higher dehalogenase activity than the CFE obtained from cells grown on DL-2chloropropionate under aerobic condition. Reverse transcription quantitative PCR showed that the L-DEX gene was expressed constitutively independent of the electron donor (haloalkanoates or acetate) or acceptor (chlorate or oxygen), whereas expression of dehI was induced by haloalkanoates. Concurrent degradation of organic and inorganic halogenated compounds by strain AW-1 T represents a unique metabolic capacity in a single bacterium, providing a new piece in the puzzle of the microbial halogen cycle.

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Impacts of heavy metals on 1,2-dichloroethane biodegradation in co-contaminated soil

Cited by 30 publications

References 35 publications

Cr(VI) and lindane removal by Streptomyces M7 is improved by maize root exudates

Cr(VI) and lindane removal by Streptomyces M7 is improved by maize root exudates

Integral use of sugarcane vinasse for biomass production of actinobacteria: Potential application in soil remediation

Microbial transformation of organic and inorganic halogen compounds

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