Sludge treatment at a mesophilic temperature
AssigneeUnited Utilites PLC
InventorSon Le
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Abstract
A method of treating sewage sludge comprises incubating raw sludge at a temperature in the mesophilic range to reduce the pathogen content of the sludge.
Claims23
A method of treating sewage sludge comprising the step of incubating raw sludge at a temperature in the mesophilic range to reduce the pathogen content of the sludge.
A method according to any preceding claim, wherein the sludge is incubated for a period between about 0.5 and 7 days.
A method according to any preceding claim, wherein the sludge is incubated in an incubation vessel provided with means for collecting and discharging biogas generated by the incubation process.
A method according to any preceding claim, comprising the further step of treating the sludge to reduce its organic content.
Apparatus for treating sewage sludge, comprising an incubation vessel for incubating sewage sludge having an inlet for receiving raw sludge to be treated and an outlet for discharging treated sludge after a predetermined retention period, means for discharging gas generated by the incubation process, and means for maintaining the incubation vessel at a temperature within the mesophilic temperature range to reduce the pathogen content of the sludge.
A method of treating sewage sludge substantially as hereinbefore described, with reference to the accompanying drawing.
Apparatus for treating sewage sludge substantially as hereinbefore described, with reference to the accompanying drawing.
Dependencies are inferred from the claim text.