Immobilized Cell Reactor – Does it Benefit Wastewater Treatment?
Amongst the technologies, immobilized cell oxidation process was used more successfully because of its treatment of wastewater. Immobilized cells are defined as cells which are inserted within or associated with an insoluble matrix. Mattiasson discussed six general procedures of immobilization: covalent coupling, adsorption, biospecific affinity, entrapment at a three dimensional polymer network, confinement at a liquid-liquid emulsion, and entrapment within a semipermeable membrane.membrane bioreactors
Under many conditions in the immobilized cell reactor, immobilized cells possess a benefit over either absolutely free cells or trapped enzymes. By preventing washout, immobilization enables a higher cell density to be maintained in a immobilized-cell reactor in any given flow rate. Catalytic stability is more than immobilized cells and some immobilized microorganisms tolerate higher concentration of toxic compounds compared to their non-immobilized counterparts.
One partial disadvantage of immobilization would be the increased resistance of substrates and products to diffusion through matrices applied for immobilization. Owing to the very low solubility of oxygen in water and also the high regional cell density, oxygen transfer regularly becomes the speed limiting factor in the performance of aerobic immobilized cell reactor methods. So when aerobic cells have been used, aeration technique bears a very important consideration in immobilized cell bioreactor design technology.
Advanced ‘Immobilized Cell Reactor’ employing aerobic cells, has long been recommended for the treatment of tannery wastewater. The activated carbon serves as a matrix to ease discerning solute transfer, increased bio film attachment or limits the permeation of germs into the downstream.