title: The degradation of linear alkylbenzene sulfonate (LAS) in the presence of light and natural biofilms: the important role of photosynthesis.
abstract: Photosynthesis of algae usually changes the chemical conditions of microenvironment in natural waters. However, few studies have been carried out to examine the effects of diurnal variation and photosynthesis on behavior of organic pollutants in aquatic environments. In this study, linear alkylbenzene sulfonate (LAS) was selected as a representative of non-persistent organic pollutants to investigate the degradation of this type of pollutants in the presence of light and natural biofilms by laboratory batch experiments, with special emphasis on the effect of photosynthesis of the biofilms. The maximum decrease of LAS was observed in the coexistence of both illumination and fully active biofilms, and about 75% of the LAS were removed after a 36-h degradation experiment. The removal of LAS was found to be dominated by photosynthesis of the biofilms, with lesser roles attributed to biodegradation and adsorption by the biofilms, and the role of direct photolysis was negligible. The production of some reactive oxygen species might account for the role of photosynthesis in decomposing the LAS. The study confirms the important roles of algae biofilms and their photosynthesis in determining the fate of organic pollutants in aquatic environments.
authors: Key Lab of Groundwater Resources and Environment of Ministry of Education, Key Lab of Water Resources and Aquatic Environment of Jilin Province, College of Environment and Resources, Jilin University, Changchun 130012, PR China.
authors: Xiuyi
authors: X
authors: Hua
authors: Ming
authors: M
authors: Li
authors: Yulong
authors: Y
authors: Su
authors: Deming
authors: D
authors: Dong
authors: Zhiyong
authors: Z
authors: Guo
authors: Dapeng
authors: D
authors: Liang
mesh_terms: D000327:Adsorption; D017738:Alkanesulfonic Acids / Q000737:chemistry* / Q000378:metabolism; D001419:Bacteria / Q000378:metabolism; D001673:Biodegradation, Environmental; D018441:Biofilms / Q000145:classification; D000460:Chlorophyta / Q000502:physiology; D017377:Diatoms / Q000502:physiology; D006863:Hydrogen-Ion Concentration; D008027:Light; D010084:Oxidation-Reduction; D010100:Oxygen / Q000032:analysis; D010788:Photosynthesis; D013501:Surface-Active Agents / Q000737:chemistry* / Q000378:metabolism; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000378:metabolism
chemical_list: D017738:Alkanesulfonic Acids; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical; C030641:alkylbenzyl sulfonic acid; D010100:Oxygen