We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Effects of Groundwater Geochemical Constituents on Degradation of Benzene, Toluene, Ethylbenzene, and Xylene Coupled to Microbial Dissimilatory Fe(III) Reduction.
- Authors
Li, Jing-jie; Cai, Wu-tian; Zhao, Yong-sheng; Dong, Jun; Lian, Sheng
- Abstract
Benzene, toluene, ethylbenzene, and xylene (BTEX) are a group of monoaromatic petroleum-derived pollutants. Dissimilatory iron-reducing bacteria are able to obtain energy for growth and function by coupling the oxidation of organic compounds and the reduction of Fe(III) to Fe(II) in a subsurface environment. Batch experiments were conducted to study the effects of groundwater geochemical compositions on the degradation of BTEX coupled to microbial dissimilatory Fe(III) reduction. Results indicated that, the BTEX degradation coupled to microbial dissimilatory Fe(III) reduction could be described as pseudo-first-order kinetics, the order of BTEX degradation rate exhibited xylene>ethylbenzene>toluene>benzene. Cations and anions underwent inhibition-dominated reactions (carbonate, calcium, and magnesium) or enhancement-dominated reactions (bicarbonate and sulfate) on degradation of BTEX: (1) lower concentrations of carbonate, calcium, and magnesium enhanced the BTEX degradation, whereas higher concentrations exhibited inhibition of BTEX degradation; (2) increase in bicarbonate concentrations led to a higher BTEX removal efficiency; (3) it was found that removal of BTEX was accelerated at concentrations of SO42−<200 mg/L, and was proportional to BTEX removal efficiency. Therefore, groundwater geochemical compositions have profound effects on degradation of BTEX coupled to dissimilatory Fe(III) reduction, which has important significance for removing of aromatic compounds from a contaminated aquifer.
- Subjects
GEOCHEMISTRY; IRON; CATIONS; ANIONS; TOLUENE; BENZENE
- Publication
Environmental Engineering Science, 2014, Vol 31, Issue 4, p202
- ISSN
1092-8758
- Publication type
Article
- DOI
10.1089/ees.2012.0515