Biodegradation of Tetrabromobisphenol-A in Mangrove Sediments

Abstract

Tetrabromobisphenol-A (TBBPA) is a pollutant which has a devastating impact on our environment and should be removed from earth. This research aims to evaluate the aerobic and anaerobic TBBPA degradation and bacterial community changes in mangrove sediments. TBBPA degradation in the sediments was enhanced with a microcapsuled enzyme extract of spent mushroom compost (MC) under aerobic conditions and with zerovalent iron under anaerobic conditions. The TBBPA aerobic or anaerobic degradation rates were enhanced for three time additions. Four bacterial genera (Bacillus, Erythrobacter, Pseudomonas, Rhodococcus) were associated with TBBPA aerobic degradation; and four other bacterial genera (Desulfovibrio, Pseudomonas, Sphaerochaeta, Sphingomonas) were associated with TBBPA anaerobic degradation in the sediment. Moreover, nine methanogens were identified under anaerobic conditions that might also be involved in TBBPA anaerobic degradation in the sediment. Our results demonstrate two feasible methods toward TBBPA bioremediation for mangrove sediments under aerobic and anaerobic conditions.

Response of microbial community in the soil of halophyte after contamination with tetrabromobisphenol A

“…Furthermore, the residual TBBPA concentrations were in the following order: SUA > PHR > KAN. Jiang et al [13] demonstrated that TBBPA with initial concentration of 10 mg/kg was almost degraded in Kandelia obovata -planted sediment during the 93-day growth period, which is in line with the present study. It was found that TBBPA biodegradation in the mangrove sediments was enhanced with fungi enzymes under aerobic conditions [37].…”

“…Actinobacteriota played important roles in removing complex organic matter, nitrogen and phosphorus [40]. Yang et al [37] demonstrated that the classes of Gammaproteobacteria dramatically decreased and Alphaproteobacteria, Sphingobacteria, and Flavobacteria increased after addition of TBBPA in mangrove sediments after 45 days of cultivation under aerobic conditions. The mainly phyla were Proteobacteria, Chloro exi, Firmcutes, Actinobacteria, Bacteroidetes, Acidobateria, Nitrospira, and Cyanobacteria in the A. marina and K. obovata covered sediments after 93-day greenhouse pot experiment [13].…”

“…The aerobic anoxygenic phototrophy bacteria were widely distributed in marine environments, which played a unique role in bioremediation of pollution [12]. The fermentation function might be related to bacterial debromination of TBBPA [37].…”

“…Thus, if disposed improperly, BFRs in the recycling sites that adjacent to soil and river water could be nally transferred to the marine, which can exert potentially devastating effects on ecosystem structure and function. Wang et al [34] found that Bacillus, Erythrobacter, Pseudomonas, and Rhodococcus were the main genus in a mangrove sediment. Jiang et al [13] demonstrated that the predominant genus in TBBPA polluted mangrove species sediments were Anaerolineae, Geobacter, Pseudomonas, Flavobacterium, and Azoarcus.…”

Aerobic and Anaerobic Biodegradability of Organophosphates in Activated Sludge Derived From Kitchen Garbage Biomass and Agricultural Residues

“…Zero-valent iron can provide electrons for microorganisms and keep the redox potential of the anaerobic environment low ( Völker et al, 2017 ). Studies have shown that the presence of iron chips (1 g⋅L –1 ) in water can significantly increase the anaerobic degradation of Chlorpyrifos and Bisphenol A ( Shi et al, 2019b ; Yang et al, 2019 ). Iron is also a major protein cofactor that is essential for most organisms and increases the production of degrading enzymes ( Beauchene et al, 2015 ).…”