Degradation under methanogenic conditions

Many investigators have also shown that toluene can be degraded under methanogenic conditions. The first report of this was that of Warder < / (1980) who measured a 5% 14C02 recovery and some methane from 14C-toluene after a 233-... 

Several investigators have also described efficient MTBE degradation under methanogenic conditions [19]. Several promising field studies are under investigation. 

Degradation under methanogenic conditions and the use of nitrate, sulphate and ferric iron has been shown to a Umited extent [33-38]. Compared to aerobic MTBE degradation, removal rates under anaerobic conditions are extremely slow and long accUmatisation periods are required. It cannot be considered as a feasible remediation option until further research is carried out. 

Degradation of trichloroethylene by anaerobes via reductive dehalogenation can be problematic because a common product is vinyl chloride, a known carcinogen (Ensley 1991). In an anaerobic colunm operated under methanogenic conditions, 100% transformation of injected tetrachloroethylene and trichloroethylene to... 

Ejlertsson J, Alnervik M, Jonsson S, Svensson BH (1997) Influence of water solubility, side-chain structure on the degradation of phthalic acid esters under methanogenic conditions. Environ Sci Technol 31 2761-2764... 

Mineralization of Dicamba was demonstrated under methanogenic conditions and the degradation pathway elucidated. 

Soil Under aerobic conditions, indigenous microbes in contaminated soil produced pentachlorocyclohexane. However, under methanogenic conditions, a-BHC was converted to chlorobenzene, 3,5-dichlorophenol, and the tentatively identified compound 2,4,5-trichlorophenol (Bachmann et al., 1988). Manonmani et al. (2000) isolated a microbial consortium from sewage and soil that could completely mineralize a-BHC in 14 d at 30 °C. The acclimated consortium could degrade up to 100 mg/L of a-BHC within 72 h at a degradation rate of 58 mg/L-day. 

CASRN 118-91-2 molecular formula C7H5CIO2 FW 156.57 Biological. Suflita et al. (1982) reported that 2-chlorobenzoic acid degraded under anaerobic conditions by a stable methanogenic bacterial consortium enriched from sludge. The primary... 

Water solubility is a major factor limiting the degradation of phthalate esters under methanogenic conditions. In a study of the degradation of di(2-ethylhexyl) phthalate... 

Other studies reporting benzene degradation under anaerobic conditions are similarly difficult to interpret. For instance, Ghosh Sun (1992) observed a loss of l6mg/l benzene over a 44 day period in a bioreactor that did not exhibit a detectable lag period prior to the onset of benzene removal. We can only presume that the bioreactor was not methanogenic as the ambient pH was 5.2-5.5, but no exogenously supplied electron acceptor was available. In this study, the abiotic loss observed in a single control bottle accounted for 50% of the total mass of benzene. 

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