Biotechnology Vol 11a Wastewater Treatment Winter

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Extra resources for Biotechnology Vol 11a Wastewater Treatment Winter

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10). , 1982). For acetate such a dramatic disadvantage of methanogens was not observed. , 1994). 9 Biogas Amounts and Composition of Biogas During Fermentation of Carbohydrates, Protein, and Fat From an economic point of view, the specific biogas amounts and the biogas quality from anaerobic treatment of wastewater and sludge are very important process parameters. For 8 (H) 2 H + SO:- +H2S 4H,O (10) this reason, a basis for prediction of amount and composition of biogas was elaborated alUndissociated hydrogen sulfide is toxic for ready in the 1930s (BUSWELL and NEAVE,1930; methanogens and sulfate reducers as well.

Only at a very low H2partial pressure, that can be maintained by hydrogen-utilizing methanogens or sulfate reducers, P-oxidation of at least n-butyrate or propionate is exergonic. Methanol, ethanol, and ammonia are formed from choline (Fig. 6). After hydrolysis, fermentation, and acetogenesis of the fat components in the methanogenic phase acetate, C02, and hydrogen are converted to biogas. All subsequent intracellular reactions may be influenced by syntrophic interaction via interspecies hydrogen transfer except for the extracellular initial lipase reaction.

Biogas plants with co-fermentation of waste fat residues are considered waste treatment systems (Chapter 11, this volume) and must be designed to meet the hygienic demands relevant for treatment of the respective waste. 24) Fermentation Acetoaenesis &Oxidation pH2Z. lod atrn Acetoaenesis Methanoaenesis ,-::::::::::I Fig. 6. Anaerobic degradation of fat. 8 Competition of Sulfate Reducers with Methanogens in Methane Reactors . , normally contain less than 200 mg sulfate per liter. , for cleaning stainless steel containers and pipes in the dairy industry, to maintain an acid pH in bioreactors for bakers’ yeast or citric acid production or if ammonia sulfate is used to inhibit metabolic routes in bakers’ yeast for the production of biochemicals, the wastewater contains large amounts of sulfate.

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