Chromium containing waste water treatment method

A treatment method and technology for chromium wastewater, applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. more questions
CN1556048AInactive Publication Date: 2004-12-22DONGFENG MOTOR FASTENER CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
DONGFENG MOTOR FASTENER CO LTD
Publication Date
2004-12-22
Estimated Expiration
Not applicable · inactive patent

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Abstract

A process for treating the Cr-contained sewage includes preparing liquid-state ferrous sulfate by displacement reaction, removing oil from said sewage, adding said liquid-state ferrous sulfate, reduction reacting to reducing 6-valence Cr to 3-valence Cr, adding alkali to generate deposit of chromium hydroxide, deposit separation, discharging water, and press filter of mud.
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Description

technical field

[0001] The invention relates to a wastewater treatment method, in particular to a chromium-containing wastewater treatment method. Background technique

[0002] The cleaning wastewater after galvanizing low-chromium passivation is collected separately because it contains highly toxic hexavalent chromium, which is called chromium-containing wastewater. The PH value of chromium-containing wastewater is above 4, and its main components are chromic anhydride, sulfuric acid and nitric acid, and the ions contained include Cr 6+ , Fe 2+ , Zn 2+ 、Cr 3+ 、Na + , NO 3 - , SO 4 2- etc., the ions that need to be processed are Cr 6+ , Fe 2+ , Zn 2+ 、Cr 3+ , where Cr 6+ It is the main ion to be processed, and its concentration is around 20mg / l. In the presence of acid, chromic anhydride in solution exists as:

[0003] <chemistry num="001"> <chem file="200410012654_cml001.xml" / > < / chemistry>

[0004] When acid is added to the solution, t...

Claims

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