A method for treating trivalent chromium complex wastewater and synchronously recovering chromium with reducing compound agent combined with ultraviolet light

A technology of ultraviolet light treatment and compound chemicals, which is applied in the direction of reduced water/sewage treatment, light water/sewage treatment, metallurgical wastewater treatment, etc., can solve the problems of high treatment cost, high conversion rate, and large output of chromium-containing sludge. Achieve the effect of avoiding the treatment process and simplifying the process flow

Active Publication Date: 2020-07-28
温州大学苍南研究院
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the shortcomings of the Cr(III) complex wastewater treatment technology in the prior art, such as high conversion rate of Cr(VI), large output of chromium-containing sludge, and high treatment cost, the present invention provides a reducing compound agent combined with ultraviolet light to treat trivalent Method for synchronous recovery of chromium complex waste water and chromium

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  • A method for treating trivalent chromium complex wastewater and synchronously recovering chromium with reducing compound agent combined with ultraviolet light

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Embodiment 1

[0034] In this embodiment, a method of reducing compound reagents combined with ultraviolet light to treat trivalent chromium complex wastewater and chromium synchronously recovers, and tests the removal of chromium in 0.2mmol / L Cr-EDTA wastewater. The steps are:

[0035] A. Dosing: Add the reducing compound agent (compounded by ascorbic acid: hydroxylamine hydrochloride molar equivalent ratio = 1:1) to the wastewater of 0.2mmol / L Cr-EDTA and stir, the addition amount is 2mmol / L, the pH of the wastewater is initially The value is 3.5, the temperature is 25°C, and the pH of the wastewater is adjusted to 7 through sodium hydroxide solution;

[0036] B, ultraviolet light irradiation: the waste water of step A is processed 180min by the ultraviolet light irradiation (UV irradiation, wavelength<400nm) of medium-pressure mercury lamp, and chromium is separated out with light green precipitate form, and main component is dichromium trioxide;

[0037] C. Chromium recovery: recover chr...

Embodiment 2

[0041] In this embodiment, a method of reducing compound reagents combined with ultraviolet light to treat trivalent chromium complex wastewater and chromium synchronous recovery is applied to the removal of chromium in the wastewater of electroplating chemical industry parks. The initial pH is 2.3 and the initial chromium concentration is 23.8 mg / L. , the TOC concentration is 36mg / L, the steps are:

[0042] A. Dosing: Add a reducing compound agent with a molar ratio of 1:1 to Cr-EDTA (compounded by sodium sulfite: potassium sulfite molar equivalent ratio = 1:1) and stir. The initial pH value of the wastewater is 2.3, and the temperature is 25°C. Wastewater is adjusted to pH 8 by sodium hydroxide solution;

[0043] B, ultraviolet light irradiation: the waste water of step A is processed 180min by the ultraviolet light irradiation (UV irradiation, wavelength<400nm) of high-pressure mercury lamp, and chromium is separated out with light green precipitate form, and main component...

Embodiment 3

[0047] In this embodiment, a method of reducing complex medicament combined with ultraviolet light to treat trivalent chromium complex wastewater and chromium synchronous recovery, the test uses tap water to prepare Cr-citric acid wastewater with a concentration of 0.2mmol / L, pH=4, and a temperature of 25°C. The steps are:

[0048] A. Dosing: Add a reducing compound agent with a molar ratio of 1:2 to Cr-citric acid (compounded by ammonium sulfite:magnesium sulfite molar equivalent ratio = 1:1) and stir. The initial pH value of the wastewater is 4, and the temperature At 25°C, the pH of the wastewater was adjusted to 6 by sodium hydroxide solution;

[0049] B, ultraviolet light irradiation: the waste water of step A is processed 180min by the ultraviolet light irradiation (UV irradiation, wavelength<400nm) of amalgam ultraviolet lamp, chromium is separated out with the precipitate form of light green, and main component is dichromium trioxide;

[0050] C. Chromium recovery: re...

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Abstract

The invention discloses a method for treating trivalent chromium complexing wastewater and synchronously recycling chromium by combination of a reducing composite chemical agent and ultraviolet light,and belongs to the field of waste water treatment. A method for treating a copper complex and synchronously removing copper by combination of a reducing composite chemical agent / UV comprises the following steps: A, chemical feeding: feeding the reducing composite chemical agent in trivalent chromium complexing wastewater and stirring, and regulating pH of the wastewater to be 4-10; B, ultravioletillumination: carrying out ultraviolet light illumination treatment on the waste water which is stirred uniformly, and separating out chromium in a precipitate mode; and C, chromium recycling: recycling chromium by a solid-liquid separating method. By the method, trivalent-chromium-containing complexing wastewater such as leather making, electroplating and dyestuff can be safely and effectively treated, and the chromium can be recycled.

Description

technical field [0001] The invention belongs to the field of industrial wastewater treatment, and in particular relates to a method for treating trivalent chromium complex wastewater and synchronously recovering chromium by combining reducing compound reagents with ultraviolet light. Background technique [0002] The passivation of trivalent chromium (Cr(III)) in the electroplating process has gradually replaced the toxic and harmful hexavalent chromium passivation, and the addition of chrome tanning agents in the tanning process has resulted in the generation of a large amount of trivalent chromium wastewater. At the same time, organic complexing agents such as EDTA, NTA, citric acid, tartaric acid and oxalic acid are widely used in electroplating and tanning processes, so that chromium usually exists in a stable complex form in wastewater. Complexed chromium has high water solubility and can exist stably in a wide range of pH. It is difficult to effectively remove it by co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/32C02F1/70C02F101/22C02F103/16C02F103/24
CPCC02F1/32C02F1/70C02F2101/22C02F2103/16C02F2103/24
Inventor 黄先锋王茜然周化斌郑向勇张业健金展王奇赵敏
Owner 温州大学苍南研究院
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