corso|33472

Principles of mass balance. Stoichiometry and kinetics of chemical reactions (reversible/irreversible reactions, homogeneous/heterogeneous reactions, reaction order). Batch reactor model. Continuous flow stirred tank reactor model (analysis of response for CFSTR under transient and steady-state conditions, CFSTRs in series, relationship between reaction yield and mean hydraulic residence time). Plug flow reactor model (analysis of response for PFR under steady-state conditions, PFRs in series). Comparison between reaction yield of CFSTR and PFR. Analysis of non-ideal reactors (pulse and step feeding, residence time distribution function) Wastewater. Characterization parameters (Biochemical Oxygen Demand [BOD], Metodo di Thomas, Chemical Oxygen Demand [COD], Forms of nitrogen [TKN, ammonia N, organic N, nitrite, nitrate], Solids, Forms of phosphorous. Wastewater characteristics. Biological growth kinetics. Growth rate. Biomass production yield. Monod equation. Substrate utilization rate. Endogenous decay rate. Suspended growth CFSTR without biomass recycle. Mass balances for microrganisms and substrate. Design equations. Suspended growth CFSTR with biomass recycle. Mass balances for microrganisms and substrate. Hydraulic retention time and mean cell residence time. Design equations. Minimum cell residence time. Theoretical oxygen requirements. Economic considerations. Short mention of biological nitrification processes. Short mention of biological denitrification processes. Unit operations. Flow equalization. On-line and off-line equalization. Volume requirements. Time-dependant outflow functions. Discrete particles settling. Terminal settling velocity (Newton’s and Stokes’s laws). Overflow rate and evaluation of particle removal yield. Flocculent particles settling. Zone settling. Solids flux model. Analysis of loading conditions for secondary sedimentation basins. Compression settling. Wastewater disinfection Short overview of unit operations for sludge treatment

To successfully attend the Solid Waste Treatment Plants module and pass the final exam, basic knowledge of the following subjects is essential: • maths (with specific regard to differential and integral calculus) • physics (with specific regard to the basics of thermodynamics) • chemistry (with specific regard to the stoichiometry of chemical reactions, the concepts of chemical equilibrium in aqueous solutions and specific types of chemical reactions [acid-base, redox reactions]) • sanitary and environmental engineering (with specific regard to the pollution indicators and the principles of effluent treatment) • fluid mechanics and hydrology (with specific regard to porous media hydraulic, processing of hydrological data and rainfall-runoff transformation) • geotechnics (with specific regard to soil geotechnical and mechanical properties) No compulsory prerequisites to access the final exam are required.

Sirini P., Ingegneria Sanitaria-Ambientale. Principi, teorie e metodi di rappresentazione, McGraw-Hill, Milano, 2002 Misiti A., Fondamenti di Ingegneria Ambientale, Nuova Italia Scientifica, Firenze 1994 Metcalf & Eddy, Inc., Ingegneria delle Acque Reflue. Trattamento e Riuso, 5a ed., McGraw-Hill, Milano, 2006

Due to the COVID9 crisis, lessons are held online through google meet. Students are required to send an email to the students so as to be included as participants.

Not compulsory

Oral exam and evluation of a project

Due to the COVID9 crisis, lessons are held online through google meet. Students are required to send an email to the students so as to be included as participants.