含水层微生物以氧气、硝酸盐或一氧化二氮作为末端电子受体对单环芳烃进行生物降解。
Biodegradation of monoaromatic hydrocarbons by aquifer microorganisms using oxygen, nitrate, or nitrous oxide as the terminal electron acceptor.
作者信息
Hutchins S R
机构信息
Robert S. Kerr Environmental Research Laboratory, U.S. Environmental Protection Agency, Ada, Oklahoma 74820.
出版信息
Appl Environ Microbiol. 1991 Aug;57(8):2403-7. doi: 10.1128/aem.57.8.2403-2407.1991.
Abstract
Microcosms were prepared from aquifer material, spiked with monoaromatic hydrocarbons, and amended with oxygen, nitrate, and nitrous oxide. Benzene and alkylbenzenes were degraded to concentrations below 5 micrograms/liter within 7 days under aerobic conditions, whereas only the alkylbenzenes were degraded when either nitrate or nitrous oxide was used. With limited oxygen, monoaromatic hydrocarbons were degraded but removal ceased once oxygen was consumed. However, when nitrate was also present, biodegradation of the alkylbenzenes continued with no apparent lag. Although benzene was still recalcitrant, levels were reduced compared with levels after treatment with nitrate or limited oxygen alone.
摘要
微宇宙是由含水层物质制备而成，添加了单环芳烃，并补充了氧气、硝酸盐和一氧化二氮。在有氧条件下，苯和烷基苯在7天内降解至浓度低于5微克/升，而当使用硝酸盐或一氧化二氮时，只有烷基苯被降解。在氧气有限的情况下，单环芳烃会被降解，但一旦氧气耗尽，降解就会停止。然而，当同时存在硝酸盐时，烷基苯的生物降解会持续进行，没有明显的滞后现象。尽管苯仍然具有抗性，但与仅用硝酸盐或有限氧气处理后的水平相比，其含量有所降低。
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