title: Effects of anionic surfactant on n-hexane removal in biofilters.
abstract: The biodegradability of three anion surfactants by biofilm microorganisms and the toxicity of the most readily biodegradable surfactant to biofilm microorganisms were examined using batch experiments, and the optimal concentration of SDS for enhanced removal of hexane was investigated using two biotrickling filters (BTFs) for comparison. Results showed that SDS could be biodegraded by microorganisms, and its toxicity to microorganisms within the experimental range was negligible. The best concentration of SDS in biofiltration of n-hexane was 0.1 CMC and the elimination capacity (EC) of 50.4 g m(-3) h(-1) was achieved at a fixed loading rate (LR) of 72 g m(-3) h(-1). When an inlet concentration of n-hexane increased from 600 to 850 mg m(-3), the removal efficiency (RE) decreased from 67% to 41% by BTF2 (with SDS) and from 52% to 42% by BTF1 (without SDS). SDS could enhance hexane removal from 43% (BTF1) to 60% (BTF2) at gas empty-bed residence time (EBRT) of 7.5 s and an inlet concentration of 200 mg m(-3).
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan 410082, PR China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Cheng
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan 410082, PR China.
authors.forename: Huijun
authors.initials: H
authors.lastname: He
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan 410082, PR China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, College of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, Zhejiang 310018, PR China. Electronic address: yangc@hnu.edu.cn.
authors.forename: Chunping
authors.initials: C
authors.lastname: Yang
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan 410082, PR China.
authors.forename: Zhou
authors.initials: Z
authors.lastname: Yan
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan 410082, PR China.
authors.forename: Guangming
authors.initials: G
authors.lastname: Zeng
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan 410082, PR China.
authors.forename: Hui
authors.initials: H
authors.lastname: Qian
mesh_terms: D000393:Air Pollutants / Q000032:analysis* / Q000633:toxicity; D000838:Anions; D001673:Biodegradation, Environmental; D018441:Biofilms / Q000187:drug effects; D005374:Filtration / Q000379:methods*; D006586:Hexanes / Q000032:analysis* / Q000633:toxicity; D057927:Hydrophobic and Hydrophilic Interactions; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry*; D013501:Surface-Active Agents / Q000737:chemistry*
chemical_list: D000393:Air Pollutants; D000838:Anions; D006586:Hexanes; D013501:Surface-Active Agents; C026385:n-hexane; D012967:Sodium Dodecyl Sulfate
keywords: Biodegradation; Biofilter; Biofiltration; Hexane; Surfactant; Toxicity