[Biodegradation of LAS in the anaerobic water of a representative inlet of Lake Dianchi].
Biodegradation and degradation kinetics of anion-surfactant (LAS) in the anaerobic water of a representative inlet (Haihe River) of Lake Dianchi under different incubation conditions were studied by the 'river die-away' test method. The influences of temperature, pH, initial concentration of LAS, aeration condition and added nutrients (NH4Cl or NaH2PO4) on the biodegradation of LAS in the water were investigated. The results demonstrate that LAS can be biodegraded by microorganisms in the water and that the percentage of degradation of LAS was more than 95% after 26 d. The biodegradation of LAS fit the second kinetic model. Incubation temperature, initial concentration of LAS, aeration and added nutrients (NH4Cl or NaH2PO4) can all affect the biodegradation of LAS. When the incubation temperature increased from 10 degrees C to 25 degrees C, the biodegradation rate (p) of LAS increased from 0.21 d(-1) to 0.90 d(-1). The LAS degradation rate increased from 0.72 d(-1) under anaerobic condition to 1.97 d(-1) under continuous aeration condition. The increased initial concentrations of LAS lead to decrease of the biodegradation rate. NaH2PO4 accelerated the degradation of LAS but added NH4Cl instead inhibited degradation. In our experiment, pH value (7.05-9.44) had little influence on the biodegradation of LAS.
Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China. wazh519@hotmail.com
Zhi
Z
Wang
Xin-hai
XH
Tu
Bang-ding
BD
Xiao
Xing-qiang
XQ
Wu
Min
M
Liu
Xu-dong
XD
Chen
D017738:Alkanesulfonic Acids / Q000302:isolation & purification* / Q000378:metabolism; D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D002681:China; D005618:Fresh Water / Q000032:analysis / Q000382:microbiology; D013501:Surface-Active Agents / Q000302:isolation & purification* / Q000378:metabolism; D014871:Water Microbiology; D014874:Water Pollutants, Chemical / Q000302:isolation & purification* / Q000378:metabolism
D017738:Alkanesulfonic Acids; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical; C030641:alkylbenzyl sulfonic acid