The invention discloses a method of reducing the town
sewage and
sludge and managing the resource belonging to
solid waste treating technical field. The method is provided with following steps: diluting and breaking the dehydrated mud cake by
sodium hydroxide solution, and stripping a large amount of
organic matter in
sludge, getting concentrated
sludge and supernatant fluid by
centrifugation; dehydrating the former after
neutralization and regulation; obtaining a concentrated liquid and a filtered liquid after wind filtering and secondary
ultrafiltration of the latter. The supernatant fluid contains lots of
sodium hydroxide, and is reflowed to cycle. After disposal, the rate of
water content of the dehydrate mud cake is reduced to about 70%, lowering 50% compared to the
organic matter content before disposal, and lowering 2 / 3 of total
mass. The concentrated liquid after
ultrafiltration is mainly composed of
organic matter with a large molecule such as
humic acid, and with a low content of heavy
metal. The
pathogenic bacteria is deactivated which accords to the ''
fertilizer utilization criteria'' of Ministry of
Agriculture to produce a safe and efficient liquid
organic fertilizer. The invention is suitable for the residual active sludge generated from the town
sewage treating factory, for digesting the sludge and reducing the composite sludge and for managing the resource.