title: Pseudomonassp. LZ-Q continuously degrades phenanthrene under hypersaline and hyperalkaline condition in a membrane bioreactor system.
abstract: Phenanthrene is one of the most recalcitrant components of crude oil-contaminated wastewater. An efficient phenanthrene-degrading bacteriumPseudomonassp. strain named LZ-Q was isolated from oil-contaminated soil near the sewage outlet of a petrochemical company.Pseudomonassp. LZ-Q is able to degrade 1000 mg/L phenanthrene in Bushnell-Hass mineral salt medium. It also degrades other polycyclic aromatic hydrocarbons such as naphthalene, anthracene, pyrene, petrol, and diesel at broad ranges of salinities of 5 g/L to 75 g/L, pHs of 5.0-10.0, and temperatures of 10-42 °C. Therefore,Pseudomonassp. LZ-Q could be a good candidate for remediation of polycyclic aromatic hydrocarbon (PAH)-contaminated wastewater. A membrane bioreactor (MBR) was applied to investigate the remediation ability of the strain LZ-Q. Wastewater containing phenanthrene with pH of 8, salinity of 35 g/L, and COD of 500 mg/L was continuously added to the system (HRT = 3 h). Results showed thatPseudomonassp. LZ-Q is capable of degrading 96% of 20 mg/L phenanthrene and 94% of 500 mg/L COD for 60 days in a continuous mode. These results showed that the MBR system with strain LZ-Q might be a good approach for PAHs' remediation in industrial wastewaters.
authors.affiliation: Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Science, Lanzhou University, Lanzhou, 730000 China.
authors.forename: Yiming
authors.initials: Y
authors.lastname: Jiang
authors.affiliation: Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Science, Lanzhou University, Lanzhou, 730000 China.
authors.forename: Haiying
authors.initials: H
authors.lastname: Huang
authors.affiliation: State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101 China.
authors.forename: Mengru
authors.initials: M
authors.lastname: Wu
authors.affiliation: Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Science, Lanzhou University, Lanzhou, 730000 China.
authors.forename: Xuan
authors.initials: X
authors.lastname: Yu
authors.affiliation: Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Science, Lanzhou University, Lanzhou, 730000 China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Chen
authors.affiliation: Department of Development Biology Sciences, School of Life Science, Lanzhou University, Lanzhou, 730000 China.
authors.forename: Pu
authors.initials: P
authors.lastname: Liu
authors.affiliation: Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Science, Lanzhou University, Lanzhou, 730000 China.
authors.forename: Xiangkai
authors.initials: X
authors.lastname: Li
keywords: Hypersaline and hyperalkaline wastewater; Immobilization microorganisms; Membrane bioreactor (MBR); Phenanthrene degradation; Pseudomonas sp. LZ-Q