What is Grit Chamber?
A grit chamber is lengthy slender tanks for slowing the flow of wastewater aiding in capturing the wastes via different screening filters
| Uses | removes inorganic solids, sand, tiny rocks. |
|---|---|
| Other Uses | prevents sewage clogging, protecting drainage infrastructure. |
Grit chamber types and configuration/working
| Horizontal current flow grit chamber | |
|---|---|
| Canal width | 1-1.5m |
| Freeboard length | 0.03m |
| Adjusted space | 0.25 m |
| Confinement period | 30-60 seconds |
- A canal like channel is utilized in this type of grit chamber; the length to width proportion is high to reduce the amount of mixing.
- There is not enough depth of the current here; the big waste treatment plant requires 2 or more grit chambers
| Aerated grit chamber | |
|---|---|
| Detention range at flow rate | 2-5 |
| Depth | 2-5m |
| Length | 7.5-20m |
| Width | 2.5-7 m |
| Width depth ratio | 1:1-5:1 |
| Length width ratio | 3:1-5:1 |
| Air supply m3 / min | 0.2-0.5 |
- This chamber incorporates a blower that produces air which enters chamber by a pipe that lies at the base of the compartment itself.
- It has a good motorized design; this chamber does not require a lot of maintenance.
- It handles a good current of water flow; the particles are collected at the tank’s base.
- The aerated chamber is designed to tackle septic conditions.
| Vortex grit chamber | |
|---|---|
| Detention time at flow pace | 30 |
| Top chamber | 1.2-7.3m |
| Lower chamber | 0.9-1.8m |
| Height | 2.7-4.9m |
| 0.3mm Grit elimination % | 95 |
| 0.24mm grit elimination % | 85 |
| 0.15mm grit elimination % | 65 |
- Sewer water is introduced at grit chamber’s bottom, faced with continuous rotation in the bent grit chamber
- Constantly moving whizzer causes circulation and speedy rotation, resulting in the gathering of solids at the middle of the chamber, later collected in the containing tank.
- Airlift pumps shift the wastes to the organizer or the washer where they are segregated and washed
Horizontal rapidity
- The grit particles in the compartment gather down at its base, the grit chamber has different divides, such as the incoming sector, the outgoing sector.
- The incoming sector spreads the water flow to the grit compartment; the outgoing sector gathers the sewage water after the elimination of the gravels.
Handling the rapidity
There is a lot of traffic in terms of sewage that is to be processed,
- Flow rapidity is an essential factor in maintaining the current of the sewage
- When the current is slow, and the waste can get carried away, if the rapidity gets past the critical point, it will hamper the performance
Tank settling parameters
| Average Primary settling overflow current | 25-30 cubic meter square meter a day |
|---|---|
| Maximum Primary settling overflow current | 50-60 cubic meter square meter a day |
| Depth | 2.5 to 3.5 |
| Detention time range | 2 to 2.5 |





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