Biodegradation potential of MTBE and BTEX under aerobic, nitrate reducing, and methanogenic conditions at a gasoline-contaminated site

Remediation of diesel‐contaminated soil using in situ chemical oxidation (ISCO) and the effects of common oxidants on the indigenous microbial community: a comparison study

“…Oxidant concentrations based on weight percentage were used in this study because weight percentage is usually used to calculate concentrations of the injected oxidants in field application . The mineral medium contained the following components at the specified concentrations (units are in g L −1 of water): NH 4 Cl, 0.5; Na 2 HPO 4 · 12H 2 O, 3.2; KH 2 PO 4 , 0.8; MgSO 4 · 7H 2 O, 0.2; CaCl 2 , 0.01, and 1 mL of trace metal solution in the following concentrations: FeSO 4 · 7H 2 O, 5; ZnSO 4 · 7H 2 O, 4; MnCl 2 · 4H 2 O, 0.2; CoCl 2 · 6H 2 O, 0.5; NiCl 2 · 6H 2 O, 0.1; H 3 BO 3 , 0.15; EDTA, 2.5 . All batch experiments were conducted in duplicate and kept at 160 rpm and 25 ± 1 °C in darkness until analysis.…”

Combined Removal of an MTBE and BTEX Mixture Using Indigenous Microbe Immobilized on Waste Silica Gel

“…Thus, the removal of MTBE and BTEX has become an environmental problem owing to their health risks. The occurrence of co-contamination sites is becoming more often and more researches are focusing on the simultaneous bioremoval of BTEX and MTBE mixture [5], [6]. Previous studies suggested simultaneous bioremoval of BTEX and MTBE occurred when mixed cultures were attached to granular activated carbon particles [7].…”

Degradation of fuel components

“…TBA is being produced as metabolite during MtBE and EtBE degradation, but is also frequently used as a polar organic solvent in flavours, perfumes or paint removers. Benzene is often considered as risk determining compound at fuel-contaminated locations, because it easily dissolves and transports in groundwater and is toxic [11]. MtBE, EtBE and TBA were selected because of the widespread problem due to their high water solubility, low odour and taste values and health concerns that require remediation [12][13][14].…”

“…The medium (3) kept under N 2 /CO 2 (1 and 2) and benzene (4) were continuously added to the N 2 /CO 2 flushed (5 and 6) continuous culture (7). The recirculation batch (8) with retentostat finger (9) was used to filter (0.22 µm pore size) the liquid phase pumped to the effluent tank (11). Gas is released from the effluent tank directly to the atmosphere (10).…”

“…Benzene is a constituent of crude oil and gasoline and is often considered as riskdetermining compound at contaminated locations, because it easily dissolves and transports in groundwater and is carcinogenic [11]. Benzene may enter the groundwater from for example leaking storage tanks or pipelines.…”