FR2383132A1 - Treating biological sludge to sterilise and reduce volume - by heating with sulphuric, phosphoric and calcium ions - Google Patents

Treating biological sludge to sterilise and reduce volume - by heating with sulphuric, phosphoric and calcium ions

Info

Publication number
FR2383132A1
FR2383132A1 FR7706691A FR7706691A FR2383132A1 FR 2383132 A1 FR2383132 A1 FR 2383132A1 FR 7706691 A FR7706691 A FR 7706691A FR 7706691 A FR7706691 A FR 7706691A FR 2383132 A1 FR2383132 A1 FR 2383132A1
Authority
FR
France
Prior art keywords
pts
heating
pref
minus
plus
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.)
Granted
Application number
FR7706691A
Other languages
French (fr)
Other versions
FR2383132B1 (en
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.)
Individual
Original Assignee
Individual
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
Application filed by Individual filed Critical Individual
Priority to FR7706691A priority Critical patent/FR2383132A1/en
Publication of FR2383132A1 publication Critical patent/FR2383132A1/en
Application granted granted Critical
Publication of FR2383132B1 publication Critical patent/FR2383132B1/fr
Granted 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
    • C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning
    • C02F11/185—Treatment of sludge; Devices therefor by thermal conditioning by pasteurisation
    • 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
    • C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05B—PHOSPHATIC FERTILISERS
    • C05B17/00—Other phosphatic fertilisers, e.g. soft rock phosphates, bone meal

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Treatment Of Sludge (AREA)

Abstract

The excess sludge from biological waste sludge purificn. installations is treated by adding per 100 pts. of material in suspension 3.6-7.6 pts. (pref. 4 plus-or-minus 0.4 pts) of sulphuric ions, 2.4-5.2 pts (pref. 2.7 plus-or-minus 0.3 pts) of phosphoric ions, and 1-8-3.9 pts (pref. 2.1 plus-or-minus 0.3 pts) of Ca ions and then heating. The process uses relatively lower heating temp and pressure. The reactant used passifies steel and impedes encrustation; process does not release gs or result in disagreeable odours. The additives enhance the value of the treated sludge as a fertiliser. The proportions of the reactant may be achieved from sulphuric acid/calcium phosphate or sulphuric acid/phosphoric acid/lime or phosphoric acid/calcium sulphate and esp. the fertiliser superphosphate 18 plus-or-minus 2% P2O5 at 10-20 pts, pref. 10-12 pts per 100 pts material in suspension. The pH of the material after the addn. is adjusted if required to 5.5-6 with sulphuric acid. The heating may be carried out continuously or discontinuously in a pressure vessel at 155-180 degrees C, esp. 160-170 degrees C, and at 5-7.5 bams pressure for 45-90 mins, esp. 50-75 mins. The heating is pref. carried out by direct steam injection.
FR7706691A 1977-03-08 1977-03-08 Treating biological sludge to sterilise and reduce volume - by heating with sulphuric, phosphoric and calcium ions Granted FR2383132A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7706691A FR2383132A1 (en) 1977-03-08 1977-03-08 Treating biological sludge to sterilise and reduce volume - by heating with sulphuric, phosphoric and calcium ions

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7706691A FR2383132A1 (en) 1977-03-08 1977-03-08 Treating biological sludge to sterilise and reduce volume - by heating with sulphuric, phosphoric and calcium ions

Publications (2)

Publication Number Publication Date
FR2383132A1 true FR2383132A1 (en) 1978-10-06
FR2383132B1 FR2383132B1 (en) 1980-02-22

Family

ID=9187702

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7706691A Granted FR2383132A1 (en) 1977-03-08 1977-03-08 Treating biological sludge to sterilise and reduce volume - by heating with sulphuric, phosphoric and calcium ions

Country Status (1)

Country Link
FR (1) FR2383132A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0145700A1 (en) * 1983-11-11 1985-06-19 VOEST-ALPINE Aktiengesellschaft Process and apparatus for the production of hydrolysates from sewage sludges, organic substances or wastes to obtain substances for use in the biotechnology
EP0146526A1 (en) * 1983-11-11 1985-06-26 VOEST-ALPINE Aktiengesellschaft Process for the production of organic substances or hydrolysates from sewage sludges to obtain substrates for use in the bio industry
CN102633424A (en) * 2011-02-10 2012-08-15 栗田工业株式会社 Sludge dewatering method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0145700A1 (en) * 1983-11-11 1985-06-19 VOEST-ALPINE Aktiengesellschaft Process and apparatus for the production of hydrolysates from sewage sludges, organic substances or wastes to obtain substances for use in the biotechnology
EP0146526A1 (en) * 1983-11-11 1985-06-26 VOEST-ALPINE Aktiengesellschaft Process for the production of organic substances or hydrolysates from sewage sludges to obtain substrates for use in the bio industry
CN102633424A (en) * 2011-02-10 2012-08-15 栗田工业株式会社 Sludge dewatering method

Also Published As

Publication number Publication date
FR2383132B1 (en) 1980-02-22

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Legal Events

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DA Annulment of decision of lapse
ST Notification of lapse