New PDF release: Advances in Biochemical Engineering & Biotechnology, Volume

By Birgitte K. Ahring (Editor)

ISBN-10: 3540443215

ISBN-13: 9783540443216

Anaerobic digestion is an enormous box for the therapy of waste and wastewater. in recent years the focal point has been at the caliber of the effluent surroundings new calls for for pathogen elimination and for winning removing of undesirable chemical substances through the anaerobic strategy. the 2 volumes on Biomethanation are dedicated to providing the country of artwork in the technological know-how and alertness of anaerobic digestion. They describe the elemental microbiolgical wisdom of significance for knowing the methods of anaerobic bioreactors besides the latest molecular recommendations for interpreting those platforms. furthermore, the purposes for therapy of waste and wastewaters are offered in addition to the most recent wisdom on procedure regulate and rules of anaerobic bioprocesses. jointly those volumes supply an outline of a transforming into sector, which formerly hasn't ever been provided in this sort of complete means.

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Additional resources for Advances in Biochemical Engineering & Biotechnology, Volume 082, Biomethanation II

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Combined treatment of several types of wastewater may compensate for the lack of nutrients in some of them. Singh et al. Also, they report about the dosing of nutrients and trace metals required for the acceleration of the granulation process. The production of ECP, which plays an important role in granule formation (see Sect. 2), is often activated by limitation of nutrients. ECP formation is generally enhanced by high C : N and/or C : P ratios [105, 170, 176]. Methanobacterium formicicum and Methanobrevibacter arboriphilus AZ, which have reported to be essential for the granulation process, produce more ECP under reduced nutrient (N and/or P) conditions [105, 177, 178].

Fang and Lau [151] noticed that during the start-up of thermophilic UASB reactors using mesophilic flocculent digested sludge or disintegrated granular sludge the impact of temperature increase was more severe on the reactors with flocculent sludge. Furthermore, the granulation process was completed much earlier in the reactor inoculated with the mesophilic disintegrated granular sludge, even that all the reactors encountered sludge wash-out and deterioration right after the temperature increase.

Granules and sludge flocs with good settling abilities settle back to the granular sludge bed through the fluidized zone, while flocculent sludge and dispersed bacteria are washed-out of the reactor by the effluent stream. The formation of granular sludge is not a prerequisite for a UASB reactor, which can also be operated with well settling flocculent sludge of high methanogenic activity at low wastewater flow rates. However, the formation and stability of the granules are essential for successful operation of the UASB at high wastewater flow rates [22, 23].

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Advances in Biochemical Engineering & Biotechnology, Volume 082, Biomethanation II by Birgitte K. Ahring (Editor)


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