C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
C02F 11/18 (2006.01) B01D 1/00 (2006.01) C02F 1/02 (2006.01) C02F 1/04 (2006.01) C02F 11/10 (2006.01)
Patent
CA 2086645
TREATMENT OF SEWAGE SLUDGE (D#79,74l-F) ABSTRACT A process for treating sanitary sewage sludge to achieve increased solids, decreased viscosity, and a reduction of pathogens. The aqueous slurry of sewage sludge having a solids content in the range of about 3 to 35 wt.% is simultaneously conveyed and preheated, mascerated, heated in an heat exchanger, hydrothermally treated in a closed vessel under a blanket of nitrogen at about 500°F and a pressure of about 750 psig and above the vapor pressure of water at that temperature, dewatered and cooled in a first multi-step flash evaporation zone where the pressure is dropped in three steps from about 750 psig to about 50 psig and then in a second flash evaporation zone the pressure is dropped to about 25 psig, cooling and condensing the vapor from said first and second flash evaporation zones, and removing a dewatered pumpable slurry of sewage sludge product having a solids content in the range of about 5 to 50 wt.% and a reduced amount of pathogens. The sewage sludge product may be used as land-fill, or land applied, or burned in a partial oxidation gasifier, boiler, or incinerator. AB79741.APP
Khan Motasimur R.
Zang Richard B.
Smart & Biggar
Texaco Development Corporation
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