生物修复
化学
盐度
生物降解
盐单胞菌属
微生物联合体
废水
酵母抽提物
戒毒(替代医学)
降级(电信)
微生物降解
环境化学
生物强化
食品科学
微生物学
微生物
生物化学
细菌
环境工程
有机化学
生物
发酵
环境科学
病理
医学
电信
遗传学
16S核糖体RNA
替代医学
基因
计算机科学
生态学
作者
Guang Guo,Jiuxiao Hao,Fang Tian,Chong Liu,Keqiang Ding,Jin Xu,Wang Zhou,Zhengbing Guan
标识
DOI:10.1016/j.ecoenv.2020.111073
摘要
The high pH and salinity of textile wastewater is a major hindrance to azo dye decolorization. In this study, a mixed bacterial consortium ZW1 was enriched under saline (10% salinity) and alkaline (pH 10.0) conditions to decolorize Methanil Yellow G (MY-G). Consortium ZW1 was mainly composed of Halomonas (49.8%), Marinobacter (30.7%) and Clostridiisalibacter (19.2%). The effects of physicochemical factors were systematically investigated, along with the degradation pathway and metagenome analysis. The co-carbon source was found to be necessary, and the addition of yeast extract led to 93.3% decolorization of 100 mg/L MY-G within 16 h (compared with 1.12% for control). The optimum pH, salinity, temperature and initial dye concentration were 8.0, 5-10%, 40 °C and 100 mg/L, respectively. The typical dye-related degradation enzymes were most effective at 10% salinity. Consortium ZW1 was also able to differentially decolorize five other direct and acidic dyes in a short period. Phototoxicity tests revealed the detoxification of MY-G degradation products. Combining UV-vis, FTIR and GC-MS detection, the MY-G degradation pathway by consortium ZW1 was proposed. Furthermore, metagenomic approach was used to elucidate the functional potential of genes in MY-G biodegradation. These results signify the broad potential application of halo-alkaliphilic consortia in the bioremediation of dyeing wastewater.
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