title: Effects of surfactant and Zn (II) at various concentrations on microbial activity and ethylbenzene removal in biotricking filter.
abstract: The effects of Tween-20, a non-ionic surfactant, and Zn (II) on microbial activity and removal performance for ethylbenzene in a biotrickling filter (BTF) were evaluated. Batch experiments were conducted to evaluate the surfactant and Zn (II) at various concentrations for their toxicity to microorganisms, and results indicated that Tween-20 was beneficial to microbial activity at all the tested concentration, while Zn (II) affected adversely when the concentration overpassed 5.0mgL(-1). Then effects of the two additives on removal efficiency of ethylbenzene were evaluated in a BTF at an empty-bed retention time of 30s and an ethylbenzene concentration of 1100mgm(-3). Results showed that the optimal concentrations of Tween-20 and Zn (II) were about 12 and 1.0mgL(-1), respectively. Compared to the results when neither of the two additives was added, Tween-20 improved ethylbenzene removal efficiency from 67% to 86% at the optimal condition, while on that basis, Zn (II) just increased the removal efficiency from 86% to 90%. The promoting effects of the two additives on recovering microbial activity and removing excessive biomass were also observed in this article.
authors.affiliation: College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan 410082, China.
authors.forename: Lu
authors.initials: L
authors.lastname: Wang
authors.forename: Chunping
authors.initials: C
authors.lastname: Yang
authors.forename: Yan
authors.initials: Y
authors.lastname: Cheng
authors.forename: Jian
authors.initials: J
authors.lastname: Huang
authors.forename: Huijun
authors.initials: H
authors.lastname: He
authors.forename: Guangming
authors.initials: G
authors.lastname: Zeng
authors.forename: Li
authors.initials: L
authors.lastname: Lu
mesh_terms: D000393:Air Pollutants / Q000737:chemistry / Q000633:toxicity*; D001555:Benzene Derivatives; D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology*; D005374:Filtration / Q000295:instrumentation / Q000379:methods*; D011136:Polysorbates / Q000737:chemistry / Q000633:toxicity*; D013501:Surface-Active Agents / Q000737:chemistry / Q000633:toxicity*; D014871:Water Microbiology; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000633:toxicity*; D015032:Zinc / Q000737:chemistry / Q000633:toxicity*
chemical_list: D000393:Air Pollutants; D001555:Benzene Derivatives; D011136:Polysorbates; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical; D015032:Zinc; C004912:ethylbenzene
keywords: Biofilm; Biofilter; Ethylbenzene; Metal ion; Surfactant