US3623975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plural purpose sludge incinerating and treating apparatus and method
Assignee: ENVIROTECH SYST
•
Filing: 1969-03-14
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Granted: 1971-11-30
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Expires: 1989-03-14
Abstract
Abstract Apparatus and procedure utilizing only a single furnace for incinerating and recalcining sewage sludge and lime sludge obtained from a tertiary raw sewage treating procedure. The carbon dioxide level adjacent the discharge end of the furnace is minimized to obviate recarbonation of the recalcined lime particles discharged from the furnace. The lime particles and ash particles are allowed to form in the furnace in their natural sizes so that they may be separated mechanically. Alternatively, the ash particles and lime particles are slaked together for reuse in the sewage treatment procedure.
Inventors
- 👤 Paul J Cardinal Jr
- 👤 Robert J Sherwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:30
CPC Classifications
C; C02; C02F; C02F11/00; C02F11/12
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
43 words
The method of claim 1 in which said first incinerating zone of said furnace is maintained at a temperature not exceeding approximately 1,650* F and in which said other calcining zone of said furnace is maintained at a temperature of approximately 1,850* F.
Claim 2
Dependent Claim
24 words
The method of claim 1 which further includes E. dewatering said lime sludge and sewage sludge prior to introducing the same into said furnace.
Claim 3
Dependent Claim
33 words
The method of claim 1 which further includes E. slaking said recalcined lime and ash particles to prepare said recalcined lime particles for subsequent recycling and reuse in said raw sewage treating procedure.
Claim 4
Dependent Claim
31 words
The method of claim 1 in which said recalcined lime and ash particles are mechanically separated following discharge from said furnace by utilizing their different particle sizes to effect such separation.
Claim 5
Dependent Claim
41 words
The method of claim 1 which further includes E. treating said ash and recalcined lime particles discharged from said furnace to physically separate the same from each other so that said lime particles may be selectively reused in treating raw sewage.
Claim 6
Dependent Claim
21 words
The method of claim 6 in which said slaked lime particles are reintroduced directly into said raw sewage tertiary treating procedure.
Claim 7
Dependent Claim
48 words
The method of claim 4 in which said sEparation of said ash and recalcined lime particles is effected physically by mechanically removing said ash particles from said lime particles based on and by utilizing the different sizes of such particles following discharge of the same from said furnace.
Claim 8
Dependent Claim
17 words
The method of claim 1 in which said incineration and recalcination are effected in a multiple-hearth furnace.
Claim 9
Dependent Claim
51 words
The method of claim 9 in which the temperatures in said furnace are regulated to divide said furnace into three predetermined operative sludge treating zones in which the temperatures are maintained within preferred ranges as follows: Entrance zone approximately 900*-1,100* F. Intermediate zone approximately 1,500*-1,900* F. Discharge zone approximately 800*-1,100* F.
Claim 10
Dependent Claim
46 words
Apparatus for treating sewage sludge and lime sludge in a raw sewage treating procedure to incinerate and recalcine the same comprising, in combination, A. a single furnace having input heat sources therein except adjacent the end thereof from which ash and recalcined lime particles are discharged,
Claim 11
Dependent Claim
30 words
The apparatus of claim 11 which further includes C. a dewatering device for removing excess liquid from said sewage sludge and lime sludge prior to introduction thereof into said furnace.
Claim 12
Dependent Claim
35 words
The apparatus of claim 11 which further includes C. a slaker into which said ash and recalcined lime particles are introducible for slaking and subsequent reuse of said lime particles in said sewage treating procedure.
Claim 13
Dependent Claim
54 words
The apparatus of claim 11 in which said furnace is of the multiple hearth type having fuel burners along each of its hearths except the hearth adjacent said discharge end, whereby combustion and the carbon dioxide level adjacent said discharge end are minimized to obviate recarbonation of the recalcined lime discharged from said furnace.
Claim 14
Dependent Claim
54 words
The apparatus of claim 14 in which said furnace is operatively divided into at least two distinct zones for incinerating and recalcining said sludge in which the temperatures are maintained at a level not exceeding approximately 1,650* F. in a first incinerating zone and maintained at approximately 1,850* F. in the second calcining zone.
References Cited (Backward Citations)
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US3345288A
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US3279603A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |