Teaching

Water Quality Management (6 CFU, Fall term, University Roma Tre):

Course Syllabus

Introduction

• Overlook on water pollution issues (Novotny-Olem, pages 1-67); point source vs diffuse pollution; examples case studies of water pollution; parameters and life relevant element cycles; physical parameters.
• Physical parameters (total solids classification); chemical parameters (Chapra, part 4, pages 345 - 351)
• Dissolved oxyhen, nitrogen, phosphorus (Thomann-Mueller ch 6; pages 261 - 275); eutrophycation (Thomann-Mueller ch 7; pages 385 - 397)
• Variables, models, reactions; quality model use (Chapra, part 1, lecture 1); reactions; temperature effect (Chapra, part 1, lecture 2); temperature effects; stechiometry (Chapra, part 1, lecture 2)

Continuously Stirred Tank Reactors (CSTR) or fully mixed reactors

• mass balance of a CSTR (with sedimentation) - Chapra, part 1, lecture 3; residence time and transfer function; steady state solution; CSTR, with no loading. Half-life time (Chapra, part 1, lecture 3); CSTR: analytical solutions: dirac function (Chapra, part 1, lecture 4); CSTR: analytical solutions: step function, linear function, exponenzial loading. Linearity and effect superposition (Chapra, part 1, lecture 4); Feedforward systems of reactors; two layer stratified lakes; dispersion coefficient. Feedback systems of reactors
• Chapra, part 1, lecture 5 and 6; Chapra lecture 31 (CSTR exercises 1-2-3-4)

Water quality models and management

• Model structures. Applied hydology techinques: design hyetograph, infiltration (lecture notes)
• dry weather and rainfall wate quality. Water quality. First foul flash. Build-up and wash-off (lecture notes)
• Water quality management: combined use of sewer overflows and sedimentation tanks. Design criteria (lecture notes)
• Multi-purpose reservoirs. Best Management Practises
• Storm Water Management Model (software)
• exercise: first flush tank for sedimentation

Water quality in rivers

• PFR (Plug Flow Reactors) models. Stationary conditions. Comparison with CSTR models (Chapra, part 2, lecture 9)
• MFR (Mixed Flow Reactors) models. Stationary advection/dispersion equations. Peclet number. Limit cases (no advection, no dispersion, no decay) (Chapra, part 2, lecture 9 )
• Non stationary PFR/MFR models. Random walk and Gaussian inverse function (Chapra, part 2, lecture 10)
• Organic matter degradation without reaeration. BOD ultimate and BOD5 (Chapra, part 4, lecture 19)
• Reaeration: physical process and empirical equations. Organic matter degradation with reaeration (Chapra, part 4, lecture 19; lecture 20.2 and 20.3)
• Streeter-Phelps equations and analysis. Anoxic conditions (Chapra, part 4, lecture 21)
• Application of Streeter-Phelps equations. Multiple point sources (Chapra, part 4, lecture 21)
• Nitrogen and Total Phosphorus: models for concentration assesment (Chapra, part 4, lecture 23/24)