Abstract
Aromatic compounds are inhibitors of methane biosynthesis in anaerobic treatment of solid wastes and industrial effluents. Anaerobic treatment of solid wastes and industrial effluents may be limited by the methanogenic bacteria inhibition exerted by these types of compounds, the production of biogas is not possible and the organic matter contained in the effluent is not reduced. These effluents poured in the nature can be the basis of the pollution. The objective of this study is to evaluate the effect of monosubstituted aromatic compounds functional groups on the methanogenic inhibition. The toxicity to acetoclastic methanogenic bacteria has performed in serum flasks, utilizing digested pig manure as inoculums, by measuring methane production. The nature of aromatic functional groups was observed to have a profound effect on the toxicity of the monosubstituted aromatics. Among the monosubstituted aromatic, the chlorobenzene was the most toxic with 50% of inhibition occurring at the concentration of 30.08 mg/l. In contrast, benzoic acid is the least inhibitory with IC50 of 2515.20 mg/l. The partition coefficient octanol/water (logPoct), an indicator of hydrophobicity, had a significant correlation with the methanogenic toxicity.
Highlights
Pollution of air and water by solid wastes as well as by industrial and agricultural effluents is increasing on the one hand, and on the other, the need for energy due to the large energy crisis caused by the sudden and rapid oil consumption is increasing
Anaerobic treatment of solid wastes and industrial effluents may be limited by the methanogenic bacteria inhibition exerted by these types of compounds, the production of biogas is not possible and the organic matter contained in the effluent is not reduced
The objective of this study is to evaluate the effect of monosubstituted aromatic compounds functional groups on the methanogenic inhibition
Summary
Pollution of air and water by solid wastes as well as by industrial and agricultural effluents is increasing on the one hand, and on the other, the need for energy due to the large energy crisis caused by the sudden and rapid oil consumption is increasing. One of the technologies, enabling effective treatment of the organic fraction of the waste is methane fermentation called “anaerobic digestion”. This technique solves the pollution problem, but it produces methane used as energy source; the by-products of the treatment being used in agriculture as organic fertilizer. The biogas can be used to produce heat for cooking, drying or heating. It can be used as fuel in operation of diesel engines, gasoline engines of vehicles and generators, etc. It can be used as fuel in operation of diesel engines, gasoline engines of vehicles and generators, etc. [3]
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