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 - to help direct or break up scum formed on sedimentation tanks
- Wall cleaning - to remove build-up of biological growth, such as algae, on tank walls
- Launder cleaning - to remove and control the buildup of algae and scrum on launder channels
- 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 or rotary jet
Primary sedimentation	Scum removal	Flat fan or full cone
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

In all cleaning applications, nozzles are used to direct the cleaning fluid where it is needed (this will dictate the spray pattern of the nozzle) and to focus the cleaning fluid to increase impact. For example, when keeping channels free of debris and buildup, flat fan nozzles may be used to create a flushing motion along the length of the channel.