期刊
BIORESOURCE TECHNOLOGY
卷 120, 期 -, 页码 1-5出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2012.06.019
关键词
Bioaugmentation; Enrichment; Dissolved oxygen; Community stucture; Acidic industrial wastewater
资金
- New Century Excellent Talents in University [NECT-11-0044]
- Natural Science Foundation of China [21077011]
The successful application of bioaugmentation is largely dependent on the selective enrichment of culture with regards to pH, temperature, salt, or specific toxic organic pollutants. In this study, we investigated the effect of dissolved oxygen (DO) concentrations (aerobic, >2 mg L-1; microaerobic, <1 mg L-1) on yeast enrichment culture for bioaugmentation of acidic industrial wastewater (pH 3.9-4.7). Clone library analyses revealed that the yeast community shifted in response to different DO levels, and that Candida humilis and Candida pseudolambica were individually dominant in the aerobic and microaerobic enrichment cultures. This would significantly influence the isolation results, and further hinder bioaugmentation due to differences in DO environments during the enrichment and application periods. However, differences in the selective enrichment culture cannot be predicted based on differences in pollutant removal performance. Thus, DO concentrations (aerobic/microaerobic) should be considered a secondary selective pressure to achieve successful bioaugmentation. (c) 2012 Elsevier Ltd. All rights reserved.
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