Download Biological wastewater treatment processes: mass and heat by Davide Dionisi PDF

By Davide Dionisi

ISBN-10: 1482229269

ISBN-13: 9781482229264

"The e-book describes tips on how to use kinetic versions in keeping with the concept that of biomass progress and development stoichiometry to simulate, layout and optimize organic wastewater therapy methods. the overall strategy utilized in the booklet is to jot down expense equations for some of the strategies happening and coupling them with mass balances particular for every method. The ensuing method of non linear equations or of differential Read more...

summary: "The e-book describes the way to use kinetic versions in keeping with the concept that of biomass progress and progress stoichiometry to simulate, layout and optimize organic wastewater therapy techniques. the overall strategy utilized in the e-book is to jot down cost equations for a few of the techniques taking place and coupling them with mass balances particular for every procedure. The ensuing process of non linear equations or of differential equation is then solved utilizing Microsoft Excel. by means of various the values of the layout variables, the method is designed, simulated and optimized. as well as the conventional layout variables resembling reactor quantity, substrate removing, extra sludge construction, specific concentration is given within the booklet to pH calculation, that's fairly vital for nitrogen removing and anaerobic strategies. The booklet additionally exhibits how this modeling method will be utilized to precise case stories stated within the literature."

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Example text

27) For anaerobic fermentative microorganisms, there is no electron acceptor and therefore, similarly as for the anabolic reaction, in the catabolic reaction the substrate itself is both oxidised and reduced. The final oxidation product for the catabolic reaction is very often carbon dioxide; however, the reduced products are different depending on the specific carbon source and on the microorganisms’ type. For example, if glucose is the substrate, the reduced products from the catabolic reactions can be ethanol or hydrogen, hydrogen production being associated with the production of organic acids.

Also, an operating cost can also be associated with the treatment and disposal of the waste sludge. However, often the waste sludge is sent to an anaerobic digestion process where it is used as feedstock to produce methane, and therefore energy, and in this case it may represent a profit rather than a cost. An issue associated with the anaerobic digestion of waste sludge is its relatively slow digestion rate. To minimise the volume of the biological reactor(s), it is convenient to design the process with a high biomass concentration, so that the reaction rate per unit of reactor volume is maximised and the reactor volume can be minimised, with advantages in terms of capital costs and plant footprint.

Let’s consider now for example the aerobic metabolism of ethanol by heterotrophic microorganisms. 6) How do we determine the stoichiometric coefficients a, b, c, d? 6). In microorganisms the oxidation state of the main atoms is the following: H = +1, O = −2, N = −3. For carbon the oxidation state depends on the particular substance and it can be calculated by assuming that the molecule has an oxidation state of 0. Therefore, for the oxidation state of carbon in ethanol is: 2 ⋅ Ox C + 6 ⋅1 + 1 ⋅ (−2) = 0 which OxC = −2.

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