首页|Bacterial community and physiological characteristics of octylphenol polyethoxylate biodegradation in soil slurries
Bacterial community and physiological characteristics of octylphenol polyethoxylate biodegradation in soil slurries
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NSTL
Elsevier
? 2021 Elsevier B.V.Octylphenol polyethoxylate (OPEO) surfactants are widely used as commercial cleaning products and agricultural pesticides. Sewage effluents containing high levels of OPEOs are often discharged into soil–slurry systems. OPEOs have been identified as endocrine-disrupting compounds and are a threat to organisms present in ecological systems. Several studies have previously investigated methods to degrade OPEOs; however, clarifications regarding the impact on environmental ecology and bacterial physiological changes are required. This study aimed to evaluate the changes in bacterial community and physiological characteristics that occur during OPEO biodegradation in terms of abiotic factors. The results show that adsorption of OPEO on soil can be described using the Freundlich adsorption isotherm. The rates of OPEO biodegradation in different environmental matrices were compared and the results are as follows: aqueous system > clay–slurry system > natural soil–slurry system, all of which can be identified by their distinct community-level physiological profiles (CLPPs). OPEO biodegradation is always faster in the monomer state than in the micelle state. Bacterial numbers are maintained at high level and range from 107 to 108 CFU/mL; Pseudomonas spp. is dominant and likely plays an important role in OPEO biodegradation. Fluctuations in the utilisation of carboxylic acid groups were found. The enzymatic activity of esterases was significant, ranging from 12.5–54.1%. Phosphatase activity in the soil slurries ranged from 2.1–45.8%. The responses in terms of physiological characteristics indicate the soil ecology state during OPEO biodegradation.
NSTL
Elsevier
