Anaerobic sludge granulation（16）
Source： | Date:
2011-07-18
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2.3. Thermodynamic theories
Some authors have analysed the granulation mechan-ism in terms of the energy involved in the adhesion itself, due to the physico–chemical interactions between cells
walls or between cells walls and alien surfaces. Aspects like hydrophobicity and electrophoretic mobility are objectively taken into account. Also the influence of the
proton translocating activity across the bacterial mem-branes surface causing its energisation is added to the factors responsible for granulation.
Four step model for granule and biofilm formation: Schmidt and Ahring suggest that the granulation process in UASB reactors follows the well-described four steps of biofilm formation:
(1) Transport of cells to the surface of an uncolonised inert material or other cells (substratum).
(2) Initial reversible adsorption by physicochemical forces to the substratum.
(3) Irreversible adhesion of the cells to the substratum by microbial appendages and/or polymers.
(4) Multiplication of the cells and development of the granules.
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