Water ResourcesWastewater
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An Armchair Tour Continued

Solids Handling

sludge digesters The sludge digesters are like large, mechanical stomachs that digest the sludge for an average of 30 days. Anaerobic (in the absence of oxygen) microorganisms break down the sludge solids into stable compounds.

digester gas flare The digestion process produces carbon dioxide and methane gas. Excess methane gas is burned in a waste gas flare.

belt press for sludge dewatering Some of the water in the digested sludge is removed using belt presses. Similar to the wringers in old-fashioned washers, water is squeezed out of the sludge in the belt press. Approximately 20% of the water is removed.

dewatered sludge The "dried" sludge, shown in this photo dropping off the belt press, is trucked to a nearby landfill for use as alternative daily cover.

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