FR2325736A1 - Purifying chromium contg. solns. from rinsing baths from pickling - by electrodialysis continuously using specified apparatus - Google Patents

Purifying chromium contg. solns. from rinsing baths from pickling - by electrodialysis continuously using specified apparatus

Info

Publication number
FR2325736A1
FR2325736A1 FR7529044A FR7529044A FR2325736A1 FR 2325736 A1 FR2325736 A1 FR 2325736A1 FR 7529044 A FR7529044 A FR 7529044A FR 7529044 A FR7529044 A FR 7529044A FR 2325736 A1 FR2325736 A1 FR 2325736A1
Authority
FR
France
Prior art keywords
effluent
pickling
cathode
anode
contg
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
FR7529044A
Other languages
French (fr)
Other versions
FR2325736B3 (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 FR7529044A priority Critical patent/FR2325736A1/en
Publication of FR2325736A1 publication Critical patent/FR2325736A1/en
Application granted granted Critical
Publication of FR2325736B3 publication Critical patent/FR2325736B3/fr
Granted legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/42—Electrodialysis; Electro-osmosis ; Electro-ultrafiltration; Membrane capacitive deionization
    • B01D61/44—Ion-selective electrodialysis
    • B01D61/46—Apparatus therefor
    • B01D61/463—Apparatus therefor comprising the membrane sequence AC or CA, where C is a cation exchange membrane
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/42—Electrodialysis; Electro-osmosis ; Electro-ultrafiltration; Membrane capacitive deionization
    • B01D61/44—Ion-selective electrodialysis
    • B01D61/46—Apparatus therefor
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D21/00—Processes for servicing or operating cells for electrolytic coating
    • C25D21/16—Regeneration of process solutions
    • C25D21/20—Regeneration of process solutions of rinse-solutions
    • 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
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
    • 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

Abstract

An apparatus for purifying toxic effluent contg. hexavalent Cr continuously by electrodialysis comprises a treatment tank, connected to the effluent tank via pumps and filters, which contains an accessible cathode compartment which is separated from the anode comparment by anion exchange membranes. The cathode surface is low in relation to the anode surface to maintain a strong cathode polarisation by a continuous current from a low voltage generator. The impurities pptd. in the cathode compartment are removed by cleaning. The anion exchange membranes result in enrichment of hexavalent Cr in the anode compartment solution which is recycled as necessary via a control valve for further use. The effluent arises from pickling baths used in electroplating processing. Compared with previous treatments, the above is cheaper, recovers the hexavalent chromium for further use and is continuous. The effluent which is fed from the washing bath after pickling is recycled and therefore the rinsing bath is maintained at a constant quality level.
FR7529044A 1975-09-23 1975-09-23 Purifying chromium contg. solns. from rinsing baths from pickling - by electrodialysis continuously using specified apparatus Granted FR2325736A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7529044A FR2325736A1 (en) 1975-09-23 1975-09-23 Purifying chromium contg. solns. from rinsing baths from pickling - by electrodialysis continuously using specified apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7529044A FR2325736A1 (en) 1975-09-23 1975-09-23 Purifying chromium contg. solns. from rinsing baths from pickling - by electrodialysis continuously using specified apparatus

Publications (2)

Publication Number Publication Date
FR2325736A1 true FR2325736A1 (en) 1977-04-22
FR2325736B3 FR2325736B3 (en) 1978-05-05

Family

ID=9160314

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7529044A Granted FR2325736A1 (en) 1975-09-23 1975-09-23 Purifying chromium contg. solns. from rinsing baths from pickling - by electrodialysis continuously using specified apparatus

Country Status (1)

Country Link
FR (1) FR2325736A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2390384A1 (en) * 1977-05-12 1978-12-08 Fiat Spa PROCESS FOR DEPURING AQUEOUS EFFLUENT FROM AN ELECTROLYTIC TREATMENT PLANT
EP0010984A2 (en) * 1978-11-06 1980-05-14 Innova, Inc. Layered membrane assembly and electrochemical processes and electrochemical cell utilizing same
NL9400504A (en) * 1994-03-30 1995-11-01 Elektrolyse Project B V Method for purifying a contaminated oxidizing solution in a dialysis cell
CN100381370C (en) * 2006-06-14 2008-04-16 浙江大学 System for removing and retrieving hexavalent chrome from wastewater
IT202100017015A1 (en) * 2021-07-02 2023-01-02 Biored Srl PROCEDURE AND ELECTROCHEMICAL CELL FOR THE RECOVERY OF PURE CHROME (III) FROM USED BATHS IN THE TANNING INDUSTRY

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2390384A1 (en) * 1977-05-12 1978-12-08 Fiat Spa PROCESS FOR DEPURING AQUEOUS EFFLUENT FROM AN ELECTROLYTIC TREATMENT PLANT
EP0010984A2 (en) * 1978-11-06 1980-05-14 Innova, Inc. Layered membrane assembly and electrochemical processes and electrochemical cell utilizing same
EP0010984A3 (en) * 1978-11-06 1980-05-28 Innova, Inc. Layered membrane assembly and electrochemical processes and electrochemical cell utilizing same
NL9400504A (en) * 1994-03-30 1995-11-01 Elektrolyse Project B V Method for purifying a contaminated oxidizing solution in a dialysis cell
CN100381370C (en) * 2006-06-14 2008-04-16 浙江大学 System for removing and retrieving hexavalent chrome from wastewater
IT202100017015A1 (en) * 2021-07-02 2023-01-02 Biored Srl PROCEDURE AND ELECTROCHEMICAL CELL FOR THE RECOVERY OF PURE CHROME (III) FROM USED BATHS IN THE TANNING INDUSTRY

Also Published As

Publication number Publication date
FR2325736B3 (en) 1978-05-05

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