title: Linear alkyl benzene sulphonate (LAS) degradation by immobilized Pseudomonas aeruginosa under low intensity ultrasound.
abstract: We studied the LAS degradation of immobilized Pseudomonas aeruginosa with low-intensity ultrasonic and the influence of original LAS concentration, pH, rotary velocity and different conditions of low-intensity ultrasonic irradiation on the degradation of LAS. In our experiment, the degradation rate of LAS was the main index. We found that low-intensity ultrasonic irradiation could improve the metabolism of microorganism cells and promote the LAS biodegradation of immobilized cells. In the experiment, 50 mg/l LAS were used to simulate wastewater, and low-intensity ultrasonic was considered. We found the influence was obvious, and the optimal degradation rate was acquired when the conditions of ultrasonic were frequency 24 kHz, power 8 W, stimulation time 5 s, intermissive time 30 s, and total time 10 min. The LAS degradation rate of immobilized cells with ultrasonic were respectively 40% and 9.5% higher than that of the suspending cells and immobilized cells without irradiation.
authors.affiliation: Key Lab for Biomechanics and Tissue Engineering under the State Ministry of Education, Bioengineering College of Chongqing University, Chongqing 400044, PR China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Lijun
authors.forename: Wang
authors.initials: W
authors.lastname: Bochu
authors.forename: Li
authors.initials: L
authors.lastname: Zhimin
authors.forename: Duan
authors.initials: D
authors.lastname: Chuanren
authors.forename: Wang
authors.initials: W
authors.lastname: Qinghong
authors.forename: Liu
authors.initials: L
authors.lastname: Liu
mesh_terms: D000476:Alkanesulfonates / Q000737:chemistry; D017738:Alkanesulfonic Acids / Q000737:chemistry*; D001554:Benzene / Q000737:chemistry; D001672:Biocompatible Materials / Q000737:chemistry*; D001673:Biodegradation, Environmental; D019149:Bioreactors; D001709:Biotechnology / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D010100:Oxygen / Q000737:chemistry; D011550:Pseudomonas aeruginosa / Q000378:metabolism*; D013501:Surface-Active Agents / Q000494:pharmacology; D013997:Time Factors; D014465:Ultrasonics; D014865:Waste Disposal, Fluid / Q000379:methods*; D014867:Water; D018508:Water Purification
chemical_list: D000476:Alkanesulfonates; D017738:Alkanesulfonic Acids; D001672:Biocompatible Materials; D013501:Surface-Active Agents; C030641:alkylbenzyl sulfonic acid; D014867:Water; D001554:Benzene; D010100:Oxygen