Filtration

Rotary Screen Principle

Filtration is the first stage for all our waste water and trade effluent treatment plant designs.

It is one of the oldest techniques known to man but can have great benefits:

  • Removal of gross debris to protect downstream equipment
  • Reduction in solids content to reduce the effects of undesirable bacteriological activity within the balancing tank
  • Reduction in solids content to reduce the cost of down stream equipment that is sized according to solids loading

In summary, filtration is a high performance, low cost starting point for self treatment of waste water. It may also be improved with chemically assisted filtration – this involves the flocculation of smaller particles to make larger particles for more effective separation.

With regards to filtration, there are several options:

Rotary drum screen

Filtration Rotary Screen
  • Allows filtration to 250 microns
  • Physically strong – stainless steel wedge wire mesh, durable, long lasting
  • Small footprint – 2m by 2m
  • Only one moving part – the drum screen
  • Discharge under gravity
  • Low cost
  • Minimal maintenance
  • Guaranteed to filter at 250 microns, cannot fail to work when operating correctly
  • Requires mains water flush, preferably warm to hot, once per hour
  • Has no effect on particles < 250 microns

Salsnes

Filtration System Schematic

Filtration Run Down Screen Principles

  • Kevlar weave conveyor type
  • Allows filtration to 200 microns or less, cloths can be manufactured at 50 microns
  • Small footprint – 2m by 2m
  • Only two moving parts – the cloth conveyor and screw
  • Discharge under gravity
  • Minimal maintenance
  • Guaranteed to filter at up to 50 microns, cannot fail to work when operating correctly
  • Requires mains water flush, preferably warm to hot, once per hour
  • Has no effect on particles < 50 microns
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