title: [Influencing factors on start-up period in a bioaugmented membrane bioreactor using genetically engineered microorganism (GEM)].
abstract: High and stable atrazine removal could be obtained after a start-up period in a membrane bioreactor (MBR) bioaugmented with genetically engineered microorganism (GEM) and the removal efficiency was above 90% . The shortest start-up period was 2 d and the longest one was 12 d under different conditions. Initial influent atrazine loading, operation temperature and initial population size of GEM affected the start-up period greatly. High initial influent atrazine loading, high operation temperature and large initial population size of GEM were favorable to shorten the start-up period. The characteristics of the influent had little effect on the start-up period. When other conditions were identical, two kinds of influents, synthetic wastewater and real domestic wastewater, had the same start-up periods. Moreover, after the start-up period, atrazine removal had also no difference with these two influents in the following stable period. Then it could be concluded that the characteristics of the influent influenced atrazine removal little not only in the start-up period but also in the stable period.
authors.affiliation: State Key Joint Laboratory of Environmental Simulation and Pollution Control, Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China. liuchun02@mails.tsinghua.edu.cn
authors.forename: Chun
authors.initials: C
authors.lastname: Liu
authors.forename: Xia
authors.initials: X
authors.lastname: Huang
authors.forename: Hui
authors.initials: H
authors.lastname: Wang
mesh_terms: D001280:Atrazine / Q000378:metabolism*; D019149:Bioreactors / Q000382:microbiology*; D004926:Escherichia coli / Q000235:genetics* / Q000378:metabolism; D005818:Genetic Engineering; D006540:Herbicides / Q000378:metabolism; D008567:Membranes, Artificial; D012989:Soil Pollutants / Q000378:metabolism*
chemical_list: D006540:Herbicides; D008567:Membranes, Artificial; D012989:Soil Pollutants; D001280:Atrazine