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By Irini Angelidaki, Lars Ellegaard, Birgitte Kiœr Ahring (auth.), Professor Birgitte K. Ahring, B. K. Ahring, I. Angelidaki, J. Dolfing, L. EUegaard, H. N. Gavala, F. Haagensen, A. S. Mogensen, G. Lyberatos, P. F. Pind, J. E. Schmidt, I. V. Skiadas, K. Stam

ISBN-10: 3540443215

ISBN-13: 9783540443216

ISBN-10: 3540458387

ISBN-13: 9783540458388

Anaerobic digestion is an important box for the therapy of waste and wastewater. in recent times the focal point has been at the caliber of the effluent atmosphere new calls for for pathogen elimination and for profitable removing of undesirable chemical substances through the anaerobic technique. the 2 volumes on Biomethanation are dedicated to providing the nation of artwork in the technological know-how and alertness of anaerobic digestion. They describe the elemental microbiolgical wisdom of value for realizing the strategies of anaerobic bioreactors besides the latest molecular ideas for reading those platforms. moreover, the functions for remedy of waste and wastewaters are awarded besides the newest wisdom on method regulate and legislation of anaerobic bioprocesses. jointly those volumes provide an outline of a turning out to be sector, which formerly hasn't ever been awarded in any such finished way.

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In some cases, however, ferrous containing waste products can be obtained for codigestion most of the year, with commercial ferrous addition acting as a back up possibility only. Often secondary H2S biogas cleaning is necessary, and in this case a biological oxidation process has become the dominating solution. By injection of a small amount of air (2–8 % v/v) into the raw biogas, the hydrogen-sulfide content can be biologically oxidized either to free (solid) sulfur or (aqueous) sulfurous acid according to following reactions: 2 H2S + O2 Æ H2O + 2 S 2 H2S + 3 O2 Æ 2 H2SO3 (1) (2) The reaction will occur spontaneously and can take place in the reactor headspace on the floating layer (if any) and reactor walls, if air is injected directly in the headspace.

39 . . . . . . . . . . . 42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 45 46 47 49 50 50 50 52 52 53 55 Advances in Biochemical Engineering/ Biotechnology, Vol. 82 Series Editor: T. V. Skiadas et al. 4 Innovative Granular Sludge and/or Biofilm Reactors 5 Conclusions 6 References .

4 Summary of Processes Used for Anaerobic Treatment of Solid Wastes There is a wide variety of configurations for anaerobic treatment of solid wastes. One way to classify these reactor systems is depicted in Fig. 20. The batch systems can be considered as accelerated landfill systems. These systems are simple and comparatively cheap. MSW is loaded batch wise in a closed vessel containing inoculum from a previous batch digestion. During the digestion period, leachate is recirculated for mixing purposes of substrate, microorganisms and moisture.

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Biomethanation II by Irini Angelidaki, Lars Ellegaard, Birgitte Kiœr Ahring (auth.), Professor Birgitte K. Ahring, B. K. Ahring, I. Angelidaki, J. Dolfing, L. EUegaard, H. N. Gavala, F. Haagensen, A. S. Mogensen, G. Lyberatos, P. F. Pind, J. E. Schmidt, I. V. Skiadas, K. Stam


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