title: Biogenic substrate benefits activated sludge in acclimation to a xenobiotic.
abstract: Activated sludge that originated from a biogenic fed-batch reactor under steady-state was re-cultivated with the same biogenic substrates to test the changes in the sludge's performance in acclimation and degradation of a xenobiotic. Re-cultivations with varying biogenic concentrations were conducted at time points ranging from 16 d before to 4 d after the acclimation reactions. Biogenic re-cultivation energizes sludge cells thereby benefiting the re-cultivated biomass by shortening its acclimation lag time. Lag time increases on both sides of the re-cultivation time where lag has been shortened the most: (1) in short re-cultivation times before and after acclimation reactions, high concentrations of new or unfinished biogenic substrates cause diauxic growth that delays acclimation; (2) in long re-cultivation times, the re-cultivated biomass loses its energy-rich advantage. Both these lag lengthening situations have their worst cases in which acclimation lag times become longer than that of the original sludge, thus counterbalancing the benefits.
authors: Department of Environmental Engineering, DaYeh University, No. 168, University Road, Dacun, Changhua 51591, Taiwan, ROC. chong@mail.dyu.edu.tw
authors: Nyuk-Min
authors: NM
authors: Chong
authors: Maily
authors: M
authors: Luong
authors: Ching-Shyung
authors: CS
authors: Hwu
mesh_terms: D015084:2,4-Dichlorophenoxyacetic Acid / Q000302:isolation & purification / Q000378:metabolism*; D000064:Acclimatization / Q000502:physiology; D019149:Bioreactors / Q000382:microbiology*; D006540:Herbicides / Q000302:isolation & purification / Q000378:metabolism*; D012722:Sewage / Q000382:microbiology*; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000302:isolation & purification / Q000378:metabolism*; D015262:Xenobiotics / Q000302:isolation & purification / Q000378:metabolism
chemical_list: D006540:Herbicides; D012722:Sewage; D012989:Soil Pollutants; D015262:Xenobiotics; D015084:2,4-Dichlorophenoxyacetic Acid