Proceedings

Practical techniques to enhance the dewaterability of your sludge

Rowland Minall, Aqua Enviro: PRESENTATION ONLY

(free)

In the chemical/waste and wastewater environment;

Dewatering is the removal of water from solid material or soil by, centrifugation, filtration, or similar solid-liquid separation processes, such as removal of residual liquid from a filter cake by a filter press as part of various industrial processes.

Why Dewater?
• Wastewater treatment produces sludge streams;
– Primary sludge – 2%DS
– SAS – 0.6%DS or Humus – 1%DS
• AD produces sludge around 3.5%DS

Fresh sludge streams are 99 to 97% water

Sewage Sludge must be treated prior to disposal, this can be through Incineration or Digestion and then application to land

Sludge must be transported to treatment sites. To avoid financial penalty much of this sludge must have been effectively pasteurised (6log kill)

Why ?
• At 0.3%DS sludge contains 3kg of solids per m3

• At 30%DS, sludge contains 300kg of solids per m3, therefore by dewatering the volume transported is reduced by 100x!

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