Intermittent Sand Filters and Contact Beds
Intermittent sand filters and contact beds are two types of water treatment systems that are used to remove suspended solids and bacteria from water.
Advantages of Intermittent Sand Filters
- The effluent from intermittent sand filters is of better quality.
- The filters work under aerobic conditions, so there is no odor or slime.
- The operation is simple and requires no mechanical equipment.
Disadvantages of Intermittent Sand Filters
- The rate of filtration is slow, so they cannot be used for large plants.
- They require a large area and a lot of sand, so they are expensive to build.
What are Contact Beds?
Contact beds are similar to intermittent sand filters, but they use coarser filtering media, such as broken stones.
Operations involved in Contact Beds
- Filling
- Contact
- Emptying
- Oxidation
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