Ecological Engineering and Technology II

Learning Outcomes:

Α) Knowledge-based

• Understanding the function and physicochemical processes of stabilization ponds on wastewater treatment.
• Understanding the function and physicochemical processes of constructed wetlands on wastewater treatment.

Β) Skills/Competences acquired

• Ability to design stabilization ponds (facultative, anaerobic) for wastewater treatment.
• Ability to design maturation ponds for microorganism removal (disinfection) treated wastewater.
• Ability to design constructed wetlands (surface and subsurface flow) for wastewater treatment.

General Skills:

Autonomous work
Teamwork
Respect for the natural environment
Project design and management
Working in an interdisciplinary environment

Course Content:
1. Natural wastewater treatment systems. Definitions, differences from the conventional systems, advantages-disadvantages, natural system types.
2. Stabilization ponds: Description, function, physicochemical processes, efficiency on pollutant removal (BOD, COD, N, P)
3. Design of facultative ponds and facultative aerated pond systems, examples.
4. Anaerobic ponds: Description, function, physicochemical processes, design, examples.
5. Maturation ponds: Description, function, pathogen removal, design, examples.
6. Constructed wetland (CW) systems: Types, plant species, performance in pollutant removal.
7. Free-water surface constructed wetland systems: Hydraulic design, required surface area, design
8. Horizontal subsurface flow constructed wetland systems: Hydraulic design, required surface area, design models for pollutant removal (BOD, COD, suspended solids, nitrogen, phosphorus, microorganism), examples.
9. Evapotranspiration of free water surface and subsurface flow constructed wetlands.
10. Models for organic pollutant removal (BOD, COD).
11. Removal models of suspended solids, nitrogen, phosphorus, microorganism.
12. Vertical flow constructed wetland systems: Description, function, design, examples.
13. Construction requirements, vegetation, cost, operation, maintenance and monitoring of CW systems.

Suggested Bibliography:

• Tsihrintzis V.A.., «Ecological Engineering and Technology, Volume 2: Natural Methods for Wastewater Treatment», Edition DUTH (In Greek).
• Crites R.W. Joe Middlebrooks E., Bastian R.K. and Reed S.C., «Natural Wastewater Treatment Systems», 2nd Edition, Taylor & Francis Group, Boca Raton, USA. ISBN 978-1-4665-8327-6.
• Kadlec, R. H. and Wallace, S. D., «Treatment Wetlands», 2nd Edition, Taylor and Francis Group, Boca Raton, USA. ISBN 978-1-56670-526-4.
• Reed S.C., Crites R.W., and Middlebrooks E.J., (1995), «Natural Systems for Waste management and Treatment», 2nd Edition, McGrow-Hill, Inc., New York, USA.
• Mara D.D., and Pearson H.W., (1987), «Waste Stabilization Ponds – Design Manual for Mediterranean Europe», World Health Organization, Regional Office for Europe, EU/ICP/CWS 053.
• Dinges R., (1982), «Natural Systems for Water Pollution Control», Van Nostrand Reinhold Co., New York, USA.