Sunday, 21 October 2018

Sludge Drying Bed - Wastewater Treatment

Sludge Drying Bed-Wastewater Treatment

It is a rectangular pit excavated to the required depth .The beds are filled with gravel and coarse sand as filter.Open joints under drain pipes are laid below the gravel layer.
Sludge Drying Bed

The beds are about 15 m x 30 m in plan and are surrounded by brick walls rising about 1 m above the sand surface.
The sewage sludge from the digestion tank is brought and spread over the top of the drying beds to a depth of about 20 to 30 cm. 


A portion of the moisture drains through the bed ,while most of it is evaporated to the atmosphere.It is usually takes about 2 weeks to 2 months for drying the sludge.After drying ,the sludge cakes are removed and used as manure.

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