公开(公告)号：US3649531A

公开(公告)日：1972-03-14

申请号：US3649531D

申请日：1970-04-15

Applicant: NAT RES DEV

Inventor： BROWN BASIL REGINALD ,  WOOD LESLIE BALLENTYNE

IPC: C02F11/12 ,  C10L1/14 ,  C10L1/22 ,  C10L1/26 ,  C02C1/14

CPC classification number: C02F11/12 ,  C10L1/14 ,  C10L1/2222 ,  C10L1/224 ,  C10L1/2658

Abstract: THE DEWATERING TIME OF A SLUDGE OBTAINED BY ANAEROBIC DIGESTION OF A PRIMARY SEWAGE SLUDGE IS REDUCED SUBSTANTIALLY BY SUBJECTING THE DIGESTED SLUDGE TO AERATION WITH AIR OR OTHER SUITABLE OXYGEN CONTAINING GAS. TYPICALLY, AERATION IS CARRIED OUT FOR AT LEAST 4 HOURS, THE SLUDGE IS ALLOWED TO SETTLE, AND THEN DEWATERED WITHIN TWO DAYS. AERATION MAY BE CARRIED OUT BY MEANS OF DIFFUSED AIR OR, PREFERABLY, BY MECHANICAL MEANS USING A SURFACE AERATOR.