Biological wastewater treatment processes: mass and heat by Davide Dionisi

By Davide Dionisi

"The ebook describes find out how to use kinetic types in keeping with the idea that of biomass development and progress stoichiometry to simulate, layout and optimize organic wastewater remedy methods. the final procedure utilized in the booklet is to put in writing fee equations for some of the approaches happening and coupling them with mass balances particular for every approach. The ensuing process of non linear equations or of differential Read more...

summary: "The publication describes how one can use kinetic types in accordance with the concept that of biomass development and development stoichiometry to simulate, layout and optimize organic wastewater therapy methods. the overall strategy utilized in the ebook is to write down price equations for a number of the tactics happening and coupling them with mass balances particular for every approach. The ensuing procedure of non linear equations or of differential equation is then solved utilizing Microsoft Excel. through various the values of the layout variables, the method is designed, simulated and optimized. as well as the normal layout variables equivalent to reactor quantity, substrate elimination, extra sludge creation, specific concentration is given within the e-book to pH calculation, that's relatively vital for nitrogen removing and anaerobic strategies. The e-book additionally indicates how this modeling method will be utilized to precise case reports stated within the literature."

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Sample text

1 catabolism. New microorganisms and products Conceptual scheme showing the coupling between anabolism and Modelling Processes in Biological Wastewater Treatment ◾ 37 empirical formula for microorganisms used throughout this text will be C5H7O2N. 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.

In particular, it is important to observe that activated sludge processes for carbon and nitrogen removal typically require a longer SRT than activated sludge processes for carbon removal only, because nitrifying microorganisms are slow growers, and therefore a longer residence time is required for nitrification than for carbon removal. The OLR is the ratio between the mass flow rate of biodegradable COD in the influent to the process and the volume of the biological reactor. Compatibly with the requirements of solid–liquid separation and of aeration described earlier, it is advantageous to have processes with the highest possible OLR, because this will correspond to the lowest volume of the reactor.

253 g COD/l, where the concentration is referred to the liquid phase (and not to the gas phase). From the oxidation reaction of methane we calculate that the conversion factor for methane into COD is 4 g COD/g methane. 31 g methane/l (concentration referred to the liquid phase). 3 THE ROLE OF BIOLOGICAL PROCESSES IN WASTEWATER TREATMENT Broadly speaking, municipal wastewaters usually have similar compositions, and therefore, the sequence of treatment used for them is often very similar. 3): primary, secondary, and tertiary treatment.

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