FR2265691A1 - Electrolytic purificn. of trade effluents contg. toxic matls. - e.g. cyanide and hexavalent chromium ions - Google Patents

Electrolytic purificn. of trade effluents contg. toxic matls. - e.g. cyanide and hexavalent chromium ions

Info

Publication number
FR2265691A1
FR2265691A1 FR7410809A FR7410809A FR2265691A1 FR 2265691 A1 FR2265691 A1 FR 2265691A1 FR 7410809 A FR7410809 A FR 7410809A FR 7410809 A FR7410809 A FR 7410809A FR 2265691 A1 FR2265691 A1 FR 2265691A1
Authority
FR
France
Prior art keywords
tank
hexavalent chromium
oxidn
toxic
electrodes
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.)
Withdrawn
Application number
FR7410809A
Other languages
French (fr)
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.)
PAUDRAT ALEX
Original Assignee
PAUDRAT ALEX
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 PAUDRAT ALEX filed Critical PAUDRAT ALEX
Priority to FR7410809A priority Critical patent/FR2265691A1/en
Publication of FR2265691A1 publication Critical patent/FR2265691A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/416—Systems
    • G01N27/4166—Systems measuring a particular property of an electrolyte
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C02F2101/18—Cyanides
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • C02F2101/22—Chromium or chromium compounds, e.g. chromates

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Molecular Biology (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)

Abstract

Purificn. appts. for the continuous treatment of polluted effluents, which contain soluble toxic molecules, e.g. and hexavalent chromium ions consists of a vertical cylindrical tank with two smaller concentric tanks all have a common base. The effluent is introduced tangentially under press. into the outer tank where its pH is measured by electrodes and adjusted to suit the chemical reaction. The liq. overflows into the intermediate tank amd then through ports into the central tank. This is also fitted with electrodes, again at different levels, for measuring the oxidn-redn. potential rH. Compressed air is introduced into the central tank through a perforated pipe to stir the reacting materials. The CN ions are destroyed by oxidn. with oxygen, ozone, hypochlorites etc., and the hexavalent chromium is reduced to the non-toxic trivalent chromium by ferrous sulphate and alkali sulphites and bisulphites. The treated effluent leaves via a pipe to go to a settlement tank. Appts. is compact and works automatically; signals from the electrodes control the pH conditions, as required, and the addition of the oxidn-redn. reagents to suit the changing contamination conditions.
FR7410809A 1974-03-28 1974-03-28 Electrolytic purificn. of trade effluents contg. toxic matls. - e.g. cyanide and hexavalent chromium ions Withdrawn FR2265691A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7410809A FR2265691A1 (en) 1974-03-28 1974-03-28 Electrolytic purificn. of trade effluents contg. toxic matls. - e.g. cyanide and hexavalent chromium ions

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7410809A FR2265691A1 (en) 1974-03-28 1974-03-28 Electrolytic purificn. of trade effluents contg. toxic matls. - e.g. cyanide and hexavalent chromium ions

Publications (1)

Publication Number Publication Date
FR2265691A1 true FR2265691A1 (en) 1975-10-24

Family

ID=9136969

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7410809A Withdrawn FR2265691A1 (en) 1974-03-28 1974-03-28 Electrolytic purificn. of trade effluents contg. toxic matls. - e.g. cyanide and hexavalent chromium ions

Country Status (1)

Country Link
FR (1) FR2265691A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2465689A1 (en) * 1979-09-25 1981-03-27 Acna PROCESS FOR REMOVING CHROME FROM WASTEWATER FROM COLORING BATHS CONTAINING BINDING

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2465689A1 (en) * 1979-09-25 1981-03-27 Acna PROCESS FOR REMOVING CHROME FROM WASTEWATER FROM COLORING BATHS CONTAINING BINDING

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