W02a – Screens, Sleves, Sand & Grit removal, Settling
Course subject(s)
W02a – Screens, Sleves, Sand & Grit removal, Settling
In this lecture, ass. prof. De Koning explains the physical treatment processes in a wastewater treatment plant, including screens, sieves and sedimentation.
In the introduction the physical processes are presented within a waste water treatment plant. Thereafter screens, sieves and grinders are explained in more detail.
The three basic types of sedimentation or settling are presented, i.e. discrete, flocculent and hindered.
Discrete settling is the mechanism found in sand and grid removal. The different forms of sand and grit removal are presented, as well as their design aspects.
Discrete and flocculent settling is found in primary sedimentation. The design aspects of this process and its application is shown.
Hindered settling as found in secondary sedimentation and sludge thickening, is discussed in a seperate lecture.
Physical processes - Screens, Sieves, Sand & Grit removal, Settling
| Content |
Slides |
Video |
| Introduction Bar screens Reciprocating rake screen Continuous belt screen Bar screens – design Sieves Grinders Gravity separation Settling Discrete settling Flocculent & Hindered settling Grit removal (part.) |
1 – 2 3 – 7 8 – 9 10 – 11 12 – 15 16 17 18 19 20 – 24 25 – 26 27 – 32 |
00:00 01:19 09:41 12:50 14:15 21:06 22:25 23:19 24:38 26:27 30:26 33:29 |
| Grit removal (cont.) Primary sedimentation Primary sedimentation – turbulence Primary sedimentation – short circuiting & hydraulic stability Primary sedimentation – design Grit removal and Primary sedimentation |
33 – 36 37 – 43 44 45 – 46 47 – 51 52 |
42:22 46:54 54:53 57:36 59:12 62:58 |
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