FR2219120A1 - Simultaneous purification of cyanide and chromium-contg. effluent - by successive oxidation and reduction stages - Google Patents

Simultaneous purification of cyanide and chromium-contg. effluent - by successive oxidation and reduction stages

Info

Publication number
FR2219120A1
FR2219120A1 FR7306486A FR7306486A FR2219120A1 FR 2219120 A1 FR2219120 A1 FR 2219120A1 FR 7306486 A FR7306486 A FR 7306486A FR 7306486 A FR7306486 A FR 7306486A FR 2219120 A1 FR2219120 A1 FR 2219120A1
Authority
FR
France
Prior art keywords
chromium
effluent
contg
cyanide
reduction stages
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
FR7306486A
Other languages
French (fr)
Other versions
FR2219120B1 (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.)
SIDIC
Original Assignee
SIDIC
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 SIDIC filed Critical SIDIC
Priority to FR7306486A priority Critical patent/FR2219120A1/en
Publication of FR2219120A1 publication Critical patent/FR2219120A1/en
Application granted granted Critical
Publication of FR2219120B1 publication Critical patent/FR2219120B1/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
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/722—Oxidation by peroxides
    • 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

  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)
  • Removal Of Specific Substances (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)

Abstract

The effluent streams containing CN- and Cr6+ ions are mixed with alkali to pH >9 (9.5) and maintd at this pH while they are purified together by oxidation with 200g/litre aq. solution of Caro acid and reduction with 200g/litre aq. soln. of 83% sodium hydrosulphite. A decantation stage lasting 1h may be included to remove deposits. Separate purificn processes are unified so that the effluent streams from different stages of chromium, zinc, or cadmium plating can be treated together.
FR7306486A 1973-02-23 1973-02-23 Simultaneous purification of cyanide and chromium-contg. effluent - by successive oxidation and reduction stages Granted FR2219120A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7306486A FR2219120A1 (en) 1973-02-23 1973-02-23 Simultaneous purification of cyanide and chromium-contg. effluent - by successive oxidation and reduction stages

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7306486A FR2219120A1 (en) 1973-02-23 1973-02-23 Simultaneous purification of cyanide and chromium-contg. effluent - by successive oxidation and reduction stages

Publications (2)

Publication Number Publication Date
FR2219120A1 true FR2219120A1 (en) 1974-09-20
FR2219120B1 FR2219120B1 (en) 1980-08-01

Family

ID=9115311

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7306486A Granted FR2219120A1 (en) 1973-02-23 1973-02-23 Simultaneous purification of cyanide and chromium-contg. effluent - by successive oxidation and reduction stages

Country Status (1)

Country Link
FR (1) FR2219120A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0068458A2 (en) * 1981-06-29 1983-01-05 Degussa Aktiengesellschaft Process for treating continuous waste water streams containing variable contents of oxidizable compounds with hydrogen peroxide
CN102659276A (en) * 2012-05-04 2012-09-12 山东建筑大学 Method for comprehensively treating cyanided cadmium plating waste solution

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0068458A2 (en) * 1981-06-29 1983-01-05 Degussa Aktiengesellschaft Process for treating continuous waste water streams containing variable contents of oxidizable compounds with hydrogen peroxide
EP0068458A3 (en) * 1981-06-29 1983-06-22 Degussa Aktiengesellschaft Process for treating continuous waste water streams containing variable contents of oxidizable compounds with hydrogen peroxide
CN102659276A (en) * 2012-05-04 2012-09-12 山东建筑大学 Method for comprehensively treating cyanided cadmium plating waste solution

Also Published As

Publication number Publication date
FR2219120B1 (en) 1980-08-01

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Legal Events

Date Code Title Description
ST Notification of lapse