Unit Operations in Water Treatment (Coagulation, Sedimentation, Flotation and Filtration)

The aim of this short course is to present and exchange state-of-the-art knowledge and experience on the technologies and design practices of conventional water treatment systems. This course was previously known as "Surface Water Treatment I".

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For whom?

Professionals dealing with engineering, management and education in the fields of water supply and wastewater and urban infrastructure will benefit greatly from this short course. It is also helpful for post graduate students in environmental engineering. Participants from government organisations (such as local administrations and national agencies), non-governmental organisations and the private sector are encouraged to join. This course is ideal for practicing engineers who are working in the water supply and sewerage systems.


BSc degree in Engineering (Civil, Chemical, Environmental, Mechanical) or similar technical background meeting the MSc Programme entry requirements. For short courses, preference will be given to candidates having experience in Water Supply Engineering.

Dates, Fee, ECTS

Start: 17 January 2022
End: 04 February 2022
ECTS credit points: 5
Deadline IHE application: 16 December 2021 - 23.59 (CET)
Course fee: € 3000

VAT is not included in the course fee

Learning objectives

Upon completion, the participant should be able to:
  1. Describe the theoretical principles of the unit processes: coagulation, filtration, sedimentation and dissolved air flotation in conventional surface water treatment
  2. Apply theoretical principles to practical aspects of coagulation, filtration, sedimentation, and dissolved air flotation
  3. Determine design parameters for coagulation, filtration, sedimentation, and dissolved air flotation from laboratory experiments
  4. Design a sedimentation tank
  5. Be able to judge the performance of the unit processes:coagulation, filtration, sedimentation, and dissolved air flotation

Course content

The course covers the main unit processes of conventional surface water treatment. The following unit process will be explored in detail through lectures, laboratory sessions and workshops:

  • Coagulation: Theory of coagulation and flocculation processes: colloidal stability and mechanisms of destabilization, rapid and slow mixing, coagulation in practice, natural coagulants, coagulation kinetics, effects of coagulation.
  • Sedimentation: Hydrodynamic principles of sedimentation and flotation, Stokes law, principles of discrete settling, flocculent settling and hindered settling. Horizontal and vertical continuous flow basins, settling tanks, shape of inlets and outlets. Design of a rectangular horizontal sedimentation tank.
  • Dissolved air flotation: Key design parameters, Henry's law, nucleus theory, Stokes law, rate of rise theory, hydraulic loading rate, solids loading
  • Filtration: General introduction to various types of filtration systems, mechanical filtration, slow sand filtration, rapid sand filtration (pilot experiments, removal mechanisms, hydraulics, filter elements, rate control, backwashing, multi-layer filtration, applications, design considerations, filter arrangements, modelling, optimisation). Design aspects of the different filtration types.


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