Selection of a Very Active Microbial Community for the Coupled Treatment of Tetramethylammonium Hydroxide and Photoresist in Aqueous Solutions

被引:4
|
作者
Moretti, Giulio [1 ]
Matteucci, Federica [1 ]
Saraullo, Matteo [2 ]
Veglio, Francesco [2 ]
del Gallo, Maddalena [1 ]
机构
[1] Univ Aquila, Dept Life Hlth & Environm Sci, I-67100 Laquila, Italy
[2] Univ Aquila, Dept Ind & Informat Engn & Econ, I-67100 Laquila, Italy
来源
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH | 2018年 / 15卷 / 01期
关键词
Tetramethylammonium hydroxide; photoresist; DGGE; NGS; microbial ecological indices; AMMONIUM HYDROXIDE;
D O I
10.3390/ijerph15010041
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Aerobic treatment of wastewater containing Tetramethylammonium hydroxide (TMAH) and photoresist was investigated using a lab scale reactor inoculated with activated sludge coming from urban wastewater treatment that never received TMAH before. The consumption of TMAH was monitored by liquid ion chromatography. Biodiversity indices were calculated from Denaturing Gradient Gel Electrophoresis (DGGE) bands distribution and used to estimate changes in community composition related to adaptation to the new feeding compound. The first week of adaptation was crucial, and it was analyzed in detail: many organisms died, and the microbial community suffered a great shock. TMAH levels remained constant through the first four days, and then suddenly dropped to undetectable, and at the same time NH4+ increased. When the community showed complete adaptation, predominant groups of bacteria were obtained by the Illumina sequencing of 16s rDNA amplicons, to provide insights on ecology of the adapted community, focusing on the main actors of TMAH abatement. Richness of species (Rr) peaks suggest that the development of TMAH-consuming bacteria leads to persistent consortia that maintain toxicity resistance over time. This showed adaptation and changes of the population to the different feeding conditions, and it opens new perspectives in the in situ treatment of these important residues of industrial processes without relying on external processing plants.
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页数:11
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