p-Cresol mineralization and bacterial population dynamics in a nitrifying sequential batch reactor  

作　　者：Carlos David Silva Lizeth Beristain-Montiel Flor de Maria Cuervo-López Anne-Claire Texier 

机构地区：[1]Department of Biotechnology-CBS,Universidad Autónoma Metropolitana-Iztapalapa,Mexico City 09340,Mexico [2]Department of Process and Technology-CNI,Universidad Autónoma Metropolitana-Cuajimalpa,Mexico City 05300,Mexico

出　　处：《Journal of Environmental Sciences》2014年第9期1885-1893,共9页环境科学学报（英文版）

基　　金：supported by the Council of Science and Technology of Mexico (No.SEP-CONACYT-CB-2011-01-165174)

摘　　要：The ability of a nitrifying sludge to oxidize p-cresol was evaluated in a sequential batch reactor （SBR）. p-Cresol was first transformed to p-hydroxybenzaldehyde and p-hydroxybenzoate, which were later mineralized. The specific rates of p-cresol consumption increased throughout the cycles. The bacterial population dynamics were monitored by using denaturing gradient gel electrophoresis 0DGGE） and sequencing of DGGE fragments. The ability of the sludge to consume p-cresol and intermediates might be related to the presence of species such as Variouorax paradoxus and Thauera mechernichensis, p-Cresol （25 to 200 mg C/L） did not affect the nitrifying SBR performance （ammonium consumption efficiency and nitrate production yield were close to 100% and 1, respectively）. This may be related to the high stability observed in the nitrifying communities. It was shown that a nitrifying SBR may be a good alternative to eliminate simultaneously ammonium and p-cresol, maintaining stable the respiratory process as the bacterial community.The ability of a nitrifying sludge to oxidize p-cresol was evaluated in a sequential batch reactor （SBR）. p-Cresol was first transformed to p-hydroxybenzaldehyde and p-hydroxybenzoate, which were later mineralized. The specific rates of p-cresol consumption increased throughout the cycles. The bacterial population dynamics were monitored by using denaturing gradient gel electrophoresis 0DGGE） and sequencing of DGGE fragments. The ability of the sludge to consume p-cresol and intermediates might be related to the presence of species such as Variouorax paradoxus and Thauera mechernichensis, p-Cresol （25 to 200 mg C/L） did not affect the nitrifying SBR performance （ammonium consumption efficiency and nitrate production yield were close to 100% and 1, respectively）. This may be related to the high stability observed in the nitrifying communities. It was shown that a nitrifying SBR may be a good alternative to eliminate simultaneously ammonium and p-cresol, maintaining stable the respiratory process as the bacterial community.

关 键 词：Nitrificationp-Cresol oxidationSequential batch reactorPopulation dynamicsEcological indices 

分 类 号：X703[环境科学与工程—环境工程] S154.381[农业科学—土壤学]