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首页> 外文期刊>Applied Microbiology and Biotechnology >Performance and microbial community composition in a long-term sequential anaerobic-aerobic bioreactor operation treating coking wastewater
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Performance and microbial community composition in a long-term sequential anaerobic-aerobic bioreactor operation treating coking wastewater

机译：长期连续厌氧-好氧生物反应器处理焦化废水的性能和微生物群落组成

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The combined anaerobic-aerobic biosystem is assumed to consume less energy for the treatment of high strength industrial wastewater. In this study, pollutant removal performance and microbial diversity were assessed in a long-term (over 300 days) bench-scale sequential anaerobic-aerobic bioreactor treating coking wastewater. Anaerobic treatment removed one third of the chemical oxygen demand (COD) and more than half of the phenols with hydraulic retention time (HRT) of 42 h, while the combined system with total HRT of 114 h removed 81.8, 85.6, 99.9, 98.2, and 85.4 % of COD, total organic carbon (TOC), total phenols, thiocyanate, and cyanide, respectively. Two-dimensional gas chromatography with time-of-flight mass spectrometry showed complete removal of phenol derivatives and nitrogenous heterocyclic compounds (NHCs) via the combined system, with the anaerobic process alone contributing 58.4 and 58.6 % removal on average, respectively. Microbial activity in the bioreactors was examined by 454 pyrosequencing of the bacterial, archaeal, and fungal communities. Proteobacteria (61.2-93.4 %), particularly Betaproteobacteria (34.4-70.1 %), was the dominant bacterial group. Ottowia (14.1-46.7 %), Soehngenia (3.0-8.2 %), and Corynebacterium (0.9-12.0 %), which are comprised of phenol-degrading and hydrolytic bacteria, were the most abundant genera in the anaerobic sludge, whereas Thiobacillus (6.6-43.6 %), Diaphorobacter (5.1-13.0 %), and Comamonas (0.2-11.1 %) were the major degraders of phenol, thiocyanate, and NHCs in the aerobic sludge. Despite the low density of fungi, phenol degrading oleaginous yeast Trichosporon was abundant in the aerobic sludge. This study demonstrated the feasibility and optimization of less energy intensive treatment and the potential association between abundant bacterial groups and biodegradation of key pollutants in coking wastewater.
机译：假定厌氧-好氧生物系统的组合在处理高强度工业废水时消耗的能量更少。在这项研究中，通过长期（超过300天）台式规模顺序厌氧-好氧生物反应器处理焦化废水，评估了污染物的去除性能和微生物多样性。厌氧处理去除了三分之一的化学需氧量（COD）和一半以上的苯酚，水力停留时间（HRT）为42 h，而组合系统的总HRT为114 h去除了81.8、85.6、99.9、98.2，分别占COD，总有机碳（TOC），总酚，硫氰酸盐和氰化物的85.4％。带有飞行时间质谱的二维气相色谱仪显示，通过组合系统可完全去除苯酚衍生物和含氮杂环化合物（NHC），仅厌氧工艺平均分别可分别去除58.4％和58.6％。通过对细菌，古细菌和真菌群落进行454次焦磷酸测序来检查生物反应器中的微生物活性。变形杆菌（61.2-93.4％），尤其是β变形杆菌（34.4-70.1％）是优势细菌。在厌氧污泥中，由苯酚降解和水解细菌组成的Ottowia（14.1-46.7％），Soehngenia（3.0-8.2％）和Corynebacterium（0.9-12.0％）是最丰富的属，而Thiobacillus（6.6） -43.6％），萤光杆菌（5.1-13.0％）和Comamonas（0.2-11.1％）是好氧污泥中苯酚，硫氰酸盐和NHC的主要降解物。尽管真菌的密度低，但需氧污泥中苯酚降解的产油酵母曲霉菌含量很高。这项研究证明了减少能源密集型处理的可行性和优化，以及丰富的细菌群与焦化废水中关键污染物的生物降解之间的潜在关联。

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