Biodegradation Kinetics of Fragrances, Plasticizers, UV Filters, and PAHs in a Mixture-Changing Test Concentrations over 5 Orders of Magnitude

Heidi Birch; Karina Knudsmark Sjoholm; Arnaud Dechesne

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Biodegradation Kinetics of Fragrances, Plasticizers, UV Filters, and PAHs in a Mixture-Changing Test Concentrations over 5 Orders of Magnitude

机译：Biodegradation Kinetics of Fragrances, Plasticizers, UV Filters, and PAHs in a Mixture-Changing Test Concentrations over 5 Orders of Magnitude

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Biodegradation of organic chemicals emitted to the environment is carried out by mixed microbial communities growing on multiple natural and xenobiotic substrates at low concentrations. This study aims to (1) perform simulation type biodegradation tests at a wide range of mixture concentrations, (2) determine the concentration effect on the biodegradation kinetics of individual chemicals, and (3) link the mixture concentration and degradation to microbial community dynamics. Two hundred ninety-four parallel test systems were prepared using wastewater treatment plant effluent as inoculum and passive dosing to add a mixture of 19 chemicals at 6 initial concentration levels (ng/L to mg/L). After 1-30 days of incubation at 12 ℃, abiotic and biotic test systems were analyzed using arrow solid phase micro extraction and GC-MS/MS. Biodegradation kinetics at the highest test concentrations were delayed for several test substances but enhanced for the reference chemical naphthalene. Test concentration thus shifted the order in which chemicals were degraded. 16S rRNA gene amplicon sequencing indicated that the highest test concentration (17 mg C/L added) supported the growth of the genera Acidovorax, Novosphingobium, and Hydrogenophaga, whereas no such effect was observed at lower concentrations. The chemical and microbial results confirm that too high mixture concentrations should be avoided when aiming at determining environmentally relevant biodegradation data.

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《Environmental Science & Technology: ES&T》 |2022年第1期|293-301|共9页
作者
Heidi Birch; Karina Knudsmark Sjoholm; Arnaud Dechesne;
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作者单位

Department of Environmental Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类环境科学、安全科学;
关键词
xenobiotics; simulation biodegradation; concentration effect; microbial community; passive dosing; 16S rRNA; sequencing;

Biodegradation Kinetics of Fragrances, Plasticizers, UV Filters, and PAHs in a Mixture-Changing Test Concentrations over 5 Orders of Magnitude

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