By Hans-Joachim Jördening, Josef Winter, Editors
A deeper perception into the advanced process—es concerned about this box, masking the organic, chemical and engineering basics had to extra advance potent methodologies.The publication devotes distinct chapters to every of the 4 major components of environmental biotechnology—wastewater therapy, soil remedy, strong waste therapy, and waste fuel treatmentdealing with either the microbiological and strategy engineering aspects.The result's the mixed wisdom inside the tremendous profitable volumes 11a via 11c of the "Biotechnology" sequence in a convenient and compact shape.
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Additional resources for Environmental biotechnology: concepts and applications
11), for the anaerobic treatment of a wastewater with carbohydrates as pollutants, the gas composition should theoretically be 50% methane and 50% CO2 (Eq. 12): 23 24 1 Bacterial Metabolism in Wastewater Treatment Systems 1 mol C6H12O6 → 3 mol CH4 + 3 mol CO2 (12) Since CO2 is increasingly soluble in water with decreasing temperature and increasing pH, CO2 reacts to form bicarbonate/carbonate, and the biogas may contain more than 80% methane. The total amount of gas is then diminished by the amount of CO2 that is absorbed and solubilized in the liquid.
4 Enhanced Biological Phosphate Removal Based on an early observation that microorganisms take up more phosphate than required for cell growth, it was found that single cells accumulate polyphosphate in granules containing a few to several thousand phosphate units (Egli and Zehnder, 1994). , 1997b). The accumulated polyphosphate is assumed to be an energy source for substrate assimilation during anaerobic growth conditions and poly-â-hydroxyalkanoate (PHA) synthesis. , 2003). For biological phosphate removal by ‘luxury phosphate uptake’, the polyphosphate-accumulating bacteria in wastewater have to be subjected in sequence to an anaerobic and an aerobic environment.
The rate of cellulose degradation depends strongly on the state of the cellulose in the wastewater. If cellulose is lignin-encrusted, lignin prevents access of cellulases to the cellulose fibers. If cellulose is mainly in a crystalline form, cellulases can easily attach to it, and then hydrolysis can be a relatively fast process. At increasing loading in an anaerobic reactor fed with crystalline cellulose, acetogenesis became the rate-limiting process, leading to propionate and butyrate formation (Winter and Cooney, 1980).