Method of anaerobic digestion of sewage sludge
阅读：649发布：2022-12-22
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1. A METHOD OF ANAEROBIC DIGESTION OF SEWAGE SLUDGE, WHICH COMPRISES THE STEPS OF PREPARING THE SLUDGE TO HAVE A CONCENTRATION IN A RANGE OF FROM ABOUT 4% TO ABOUT 15%, SUFFICIENT TO PRODUCE A DIGESTED SLUDGE HAVING SUBSTANTIALLY NO SUPERNATANT LIQUOR RELEASEABLE; MAINTAINING A BODY OF SLUDGE UNDERGOING DIGESTION AND PRODUCING GAS; SUPPLYING SAID PREPARED SLUDGE SUBSTANTIALLY CONTINUOUSLY TO SAID BODY OF SLUDGE FOR SUSTAINING SAID DIGESTION AT A HIGH RATE OF CONVERSION OF SOLIDS TO GAS WHILE DISCHARGING FROM SAID BODY INCOMPLETELY DIGESTED SLUDGE AT A RATE WHEREBY THE VOLUME OF SAID SLUDGE BODY REMAINS SUBSTANTIALLY CONSTANT; FORCIBLY MIXING THE SLUDGE IN SAID BODY SO AS TO MAINTAIN A UNIFORMLY MIXED MASS OF SLUDGE UNDERGOING DIGESTION WITH THE DISCHARGING SLUDGE CONTAINING RESIDUAL GASIFIABLE MATTER IN UNIFORM DISTRIBUTION SUBSTANTIALLY REPRESENTATIVE OF THE DISTRIBUTION THEREOF IN SAID BODY OF SLUDGE UNDERGOING DIGESTION; MAINTAINING THE SUPPLY OF SAID PREPARED SLUDGE TO SAID BODY OF DIGESTION SLUDGE AT A LOADING RATE IN A RANGE FROM ABOUT 0.1 TO ABOUT 0.7 LB. OF VOLATILE SOLIDS PER CUBIC FOOT OF SAID BODY PER DAY BUT IN ANY EVENT SHORT OF A PEAK SPEED OF CONVERSION OF SOLIDS TO GAS WHILE DELIVERING FROM SAID BODY OF SLUDGE INCOMPLETELY DIGESTED SLUDGE CONTAINING UNDIGESTED MATTER IN AN AMOUNT FROM ABOUT 5% TO ABOUT 20% OF THE GASIFIABLE MATTER CONTAINED IN SAID PREPARED SLUDGE; SUBSTANTIALLY CONTINUOUSLY SUPPLYING SAID INCOMPLETELY DIGESTED SLUDGE TO A RESIDUAL GAS EXTRACTION ZONE; FORCIBLY MIXING THE SLUDGE CONTAINED IN SAID GAS EXTRACTION ZONE DURING A SLUDGE DETENTION TIME SUFFICIENT TO ALLOW AT LEAST A MAJOR PORTION OF THE RESIDUAL GASIFIABLE MATTER TO BE DIGESTED BY CONVERSION INTO GAS; AND DISCHARGING FROM SAID GAS EXTRACTION ZONE A SUBSTANTIALLY FULLY DIGESTED SLUDGE AT A RATE WHEREBY THE VOLUME OF SLUDGE IN SAID ZONE REMAINS SUBSTANTIALLY CONSTANT.
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