Microbial community structure and PAHs-degrading bacteria of activated sludge in biological wastewater treatment process

doi:10.7523/j.issn.2095-6134.2016.01.001

Abstract

Abstract:

Industrial wastewater containing refractory organics has posed serious threat towards ecology and human health. The activated sludge methods for biological treatment are regarded as the core treatment units for industrial wastewater purification, and bacteria in activated sludge wastewater treatment bioreactors play a central role. A better understanding of microbial communities in sludge can not only provide important guidance in stable operation of wastewater treatment systems, but also improve the removal of pollutants. The clear geographical differences of microbial community diversity among the activated sludge in domestic wastewater treatment processes were revealed by cluster analyses based on abundances of the operational taxonomic units or the genus/phyla assigned by pyrosequencing of 16S rDNA. Each industrial activated sludge system exhibited a unique bacterial community composition, which was clearly distinct from the common profile of bacterial phyla/classes observed in municipal plants. The community structures of activated sludge in coking wastewater treatment plants exhibited a similar community composition at each taxonomic level. The wastewater characteristics are likely to be the major determinant that drives bacterial composition at high taxonomic ranks. The operational parameters have a great impact on the bacterial community structure. In addition, a variety of PAHs-degrading bacteria are identified, and the key enzyme and pathway involved in PAH degradation are characterized. These results have potential applications for strengthening the biological degradation. This review highlights several promising areas to be explored in future.

Key words: bacterial community structure, sludge, wastewater, PAHs

CLC Number:

Q938. 1

ZHANG Yuxiu, CHAI Tuanyao. Microbial community structure and PAHs-degrading bacteria of activated sludge in biological wastewater treatment process[J]. , 2016, 33(1): 1-8.

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