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Method for recycling cyanide from electroplating cyanide-containing wastewater

A technology for cyanide and cyanide wastewater, applied in chemical instruments and methods, water pollutants, separation methods, etc., can solve serious problems, high mass concentration, external water environment pollution, etc., reduce treatment costs, reduce concentrations, and significantly The effect of economic benefits

Inactive Publication Date: 2012-10-03
厦门溢盛环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN in wastewater - The mass concentration is high, and it also contains a large amount of heavy metals, thiocyanate and other compounds, which seriously pollute the external water environment

Method used

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  • Method for recycling cyanide from electroplating cyanide-containing wastewater

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Experimental program
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Effect test

Embodiment 1

[0035] The photocatalytic oxidation electro-adsorption membrane contact reactor is used to recover cyanide from electroplating cyanide-containing wastewater. The water quality is as follows: the conductivity is 1200uS / cm, the cyanide ion concentration is 280mg / L, and the pH value is 7.1. The cyanide recovery is carried out for 24 hours.

[0036] Experimental results: After 24 hours of operation, the average removal rate of cyanide is 98.5%, and the equipment operates stably.

Embodiment 2

[0038] The photocatalytic oxidation electro-adsorption membrane contact reactor is used to recover cyanide from electroplating cyanide-containing wastewater. The water quality is as follows: conductivity is 1800uS / cm, cyanide ion concentration is 360mg / L, pH value is 7.3, and cyanide is recovered for 24 hours.

[0039] Experimental results: After 24 hours of operation, the average removal rate of cyanide is 98.2%, and the equipment operates stably.

Embodiment 3

[0041] The photocatalytic oxidation electro-adsorption membrane contact reactor is used to recover cyanide from electroplating cyanide-containing wastewater. The water quality is as follows: the conductivity is 2700uS / cm, the cyanide ion concentration is 640mg / L, and the pH value is 7.0. The cyanide recovery is carried out for 24 hours.

[0042] Experimental results: After 24 hours of operation, the average removal rate of cyanide is 98.8%, and the equipment operates stably.

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Abstract

The invention discloses a method for recycling cyanide from electroplating cyanide-containing wastewater, and relates to the recycling of cyanide. The electroplating cyanide-containing wastewater is sent into a water inlet end of a photo-catalytic oxidation reactor and a water outlet end of the photo-catalytic oxidation reactor is connected with a water inlet end of an electric adsorption reactor; the refractory organic matters in the electroplating cyanide-containing wastewater are decomposed by the photo-catalytic oxidation reactor and the effluent enters the electric adsorption reactor; electric adsorption reactor eluted concentrate enters a concentrate collection pool; the pH value of electric adsorption reactor concentrate eluent is adjusted to 2.8 by sulfuric acid; the concentrate eluent is pumped to a wastewater inlet end of a membrane contact reactor by a water pump and then enters a hollow fiber membrane outer channel; after the cyanide is removed, the wastewater flows out from a wastewater outlet end of the membrane contact reactor; sodium hydroxide which is taken as absorption liquid is pumped into an absorption liquid end of the membrane contact reactor by a plastic pump and then enters a hollow fiber membrane inner channel; after absorbing the cyanide, sodium hydroxide flows out from an absorption liquid outlet end of the membrane contact reactor; and the absorption liquid is circularly used until the absorption ability is saturated.

Description

technical field [0001] The invention relates to a method for recycling cyanide, in particular to a method for recycling cyanide from electroplating cyanide-containing wastewater by using a photocatalytic oxidation electro-adsorption membrane contact reactor. Background technique [0002] Cyanide-containing wastewater is mainly produced in rare metal smelting and electroplating production. Among the many types of plating, cyanide plating is one of the commonly used plating types, mainly used for zinc plating, lead plating, cadmium plating, copper plating, silver plating, and gold plating. In cyanide-containing wastewater, in addition to highly toxic free cyanide, there are complex ions such as copper cyanide, cadmium cyanide, silver cyanide, and zinc cyanide. CN in wastewater - The mass concentration is high, and it also contains a large amount of heavy metals, thiocyanate and other compounds, which seriously pollute the external water environment. Cyanide is a highly toxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F1/469C02F1/72C02F101/18C02F103/16
Inventor 孔健周志强
Owner 厦门溢盛环保科技有限公司
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