GB1524172A - Process of dewatering sewage sludge - Google Patents

Process of dewatering sewage sludge

Info

Publication number
GB1524172A
GB1524172A GB529/77A GB52977A GB1524172A GB 1524172 A GB1524172 A GB 1524172A GB 529/77 A GB529/77 A GB 529/77A GB 52977 A GB52977 A GB 52977A GB 1524172 A GB1524172 A GB 1524172A
Authority
GB
United Kingdom
Prior art keywords
sludge
mixture
acid
sufficient
water
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB529/77A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Agway Inc
Original Assignee
Agway Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US05/647,739 external-priority patent/US4038180A/en
Application filed by Agway Inc filed Critical Agway Inc
Publication of GB1524172A publication Critical patent/GB1524172A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Sludge (AREA)
  • Fertilizers (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

1524172 Dewatering sludge AGWAY Inc 7 Jan 1977 [9 Jan 1976] 00529/77 Headings C1C and C1B A non-compressible sewage sludge containing a known percentage by weight of water but no gaseous air phase is dewatered by mixing the sludge with a quantity of mineral acid or anhydride thereof sufficient to extract substantially all of the water initially contained in the sludge to form a mixture of sludge solids and dilute acid, and placing in a reaction vessel the mixture and a base of a type and quantity sufficient to react with the acid to generate a reaction heat sufficient to remove by evaporation a predetermined quantity of the water remaining in the mixture to allow formation, without filtration, of a granular product comprising sludge solids and a salt. The product has useful soil nutrient properties. The base is preferably ammonia, specified acids are sulphuric, sulphurous, phosphoric and phosphorous acids and specified acid anhydrides are sulphur dioxide and sulphur trioxide.
GB529/77A 1976-01-09 1977-01-07 Process of dewatering sewage sludge Expired GB1524172A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/647,739 US4038180A (en) 1974-11-22 1976-01-09 Process of dewatering sewage sludge

Publications (1)

Publication Number Publication Date
GB1524172A true GB1524172A (en) 1978-09-06

Family

ID=24598077

Family Applications (1)

Application Number Title Priority Date Filing Date
GB529/77A Expired GB1524172A (en) 1976-01-09 1977-01-07 Process of dewatering sewage sludge

Country Status (3)

Country Link
JP (1) JPS52113048A (en)
DE (1) DE2700511A1 (en)
GB (1) GB1524172A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CZ308440B6 (en) * 2019-09-12 2020-08-19 ECOCOAL, s.r.o. Method and device for processing sludges containing alkaline earth metal sulphates and sulphates

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CZ308440B6 (en) * 2019-09-12 2020-08-19 ECOCOAL, s.r.o. Method and device for processing sludges containing alkaline earth metal sulphates and sulphates

Also Published As

Publication number Publication date
JPS52113048A (en) 1977-09-21
DE2700511A1 (en) 1977-07-21

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee