By Nicholas P. Cheremisinoff
This e-book examines the practices used or thought of for organic therapy of water/waste-water and dangerous wastes. The applied sciences defined contain traditional therapy tactics, their adaptations, in addition to destiny applied sciences present in present learn. The ebook is meant for these looking an summary to the biotechnological elements of toxins engineering, and covers the foremost issues during this box. The e-book is split into 5 significant sections and references are supplied when you desire to dig deeper.
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Additional resources for Biotechnology for Waste and Wastewater Treatment
Initially, the two-stage trickling filtration process was developed to increase the removal of organics in the effluent of high rate trickling filters. In separate stage nitrification applications, the rate of nitrification is proportional to the surface area exposed to the liquid being nitrified. Plastic media is commercially available with specific surface available from 27 fi2/ft3 to 68 fi2/ft3 and as such is the best alternative for a twostage suspended growth system because of its high specific surface area.
A limitation is the length of time involved, since biological treatment can take months. There are different mechanisms that we can use to degrade 50 Biotechnology for Waste and Wastewater Treatment a compound. , aerobic or anaerobic), and various other parameters. There are suspended growth systems such as activated sludge, aerated lagoons, and anaerobic digesters where the microorganisms are suspended; and fixed film processes, which include filters and rotating biological contactors where the microorganisms grow on a fixed surface.
The methanol added is a carbon source but should not be added in excess, if left in the effluent, the methanol will exert a BOD,. Because the nitrogen gas formed in the denitrification reaction hinders the settling of the mixed liquors, a nitrogen-gas stripping reactor precedes the denitrification clarifier. Removal of residual methanol induced BOD, is an added benefit of the stripping tank. Attached Growth Systems Denitrification in attached growth systems, are accomplished by a variety of column configurations.