Important announcement

Dear visitor,

Please note that this OpenCourseWare platform will be replaced at the end of 2026 by a new platform (under the same url ocw.tudelft.nl).

Courses and their contents that are currently available the platform will partly be migrated. URL’s for this content will change and content might be unavailable for some time. In addition, some courses will not be available anymore.

If you are linking to specific courses on this platform (for instance for your students), please take timely measures to avoid problems with access. Possible actions are:

  • Download the materials to your local platform (laptop, server)
  • For educators only (including TU Delft lecturers): Contact us at ocw@tudelft.nl and inform us what course you are using in what context (institute, program, period of use, number of students). We will research (in collaboration with the authors of the course) and decide if we will migrate the course, and if yes, can supply you with a new url.

Thank you.

Home Courses Treatment of Urban Sewage Course materials Lectures 2. Elaboration Question 3

2. Elaboration Question 3

Course subject(s) 2. Primary treatment

QUESTION 3 Dimensioning of rectangular grit removal channels

Dimension the grit removal unit for a WWTP receiving a dry weather flow (dwf) of 24,000 m3/day (Assume that flow doubles during rain). Calculate with:

  • a maximum allowable horizontal flow velocity of 0.2 m/s, which is well below the maximum value of 0.3 m/s.
  • a settling velocity for the smallest grit particle to be removed of 0.012 m/s.
  • a theoratical depth of 0.7 m.
  • a freeboard of 0.3 m.
  • a grit accumulation zone depth of 0.25 m.
  • an additional length of 25% for inlet and outlet zones.
  • How many channels would you design?
  • Calculate L, W, H of each channel.

Elaboration Question 3

Creative Commons License
Urban Sewage Treatment by TU Delft OpenCourseWare is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Based on a work at https://ocw.tudelft.nl/courses/urban-sewage-treatment/.
Back to top
[sg_popup id=6]