Other cleaning applications in the water industry
Spray nozzles and systems are used for many cleaning applications in the water industry. This list is by no means exhaustive but a number are listed below:
- Scum removal
- Grit washing
- Wall cleaning
- Launder cleaning
- Aeration tank washdown
The table below details the different nozzles used in cleaning applications by different wastewater plant processes.
| Process | Typical nozzle use | Nozzle type |
|---|
| Filtration systems | Backwashing filter media, washing filter screens | Flat fan or full cone |
|---|
| Sedimentation tanks | Cleaning walls, scum removal | Fine spray or hollow cone |
|---|
| Grit removal | Washing screens to prevent clogging | Full cone |
|---|
| Primary sedimentation | Scum and sludge removal – although mechanically driven scrapers are commonly used to push sludge towards a hopper for removal, nozzles can also be used in conjunction with these systems. For example, jet nozzles might be used to help
dislodge and remove debris from the inside of equipment, ensuring smooth operation of the sludge collection system. | Flat fan |
|---|
| Biological treatment tanks | Cleaning walls | Rotary or full cone nozzles |
|---|
| Secondary clarifiers | Removing algae or biofilm buildup on launders and walls | Flat fan |
|---|
| Sludge handling | Washing sludge hoppers, tanks and trucks | Flat fan or rotary jets |
|---|