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Anaerobic digestion of waste sludges

阅读:731发布:2022-12-28

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18. THE METHOD OF TREATING PUTRESCIBLE WASTE SLUDGES DERIVED FROM A CLARIFICATION TREATMENT TO EFFECT THE ANAEROBIC DIGESTION THEREOF, WHICH COMPRISES MAINTAINING A BODY OF SLUDGE UNDERGOING DIGESTION; FEEDING RAW SLUDGE TO SAID BODY OF DIGESTING SLUDGE; WITHDRAWING PARTIALLY DIGESTED SLUDGE FROM THE BODY OF DIGESTING SLUDGE CONTAINING A MIXTURE OF NON-DIGESTIBLE SOLIDS AND UNDIGESTED GASIFIABLE MATTER; SUBJECTING THE WITHDRAWN SLUDGE TO CENTRIFUGAL SEPARATION TREATMENT SUCH AS TO EFFECT THE SEPARATION OF THE SLUDGE INTO A DILUTE OVERFLOW FRACTION SUBSTANTIALLY CONTAINING SAID UNDIGESTED GASIFIABLE MATTER, AND A CONCENTRATED FRACTION SUBSTANTIALLY CONTAINING SAID NONDIGESTIBLE SLUDGE SOLIDS; WASTING SAID COONCENTRATED NONDIGESTIBLE SOLIDS FRACTION; SEPARATING FROM SAID DILUTE OVERFLOW FRACTION A SIGNIFICANT PORTION OF THE LIQUID IN A TREATMENT SEPARATE FROM SAID CLARIFICATION TREATMENT; AND INTRODUCING THE UNDIGESTED MATTER OF SAID OVERFLOW FRACTION INTO SAID BODY OF DIGESTING SLUDGE.
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