Industrial treatment method of high-valence chromium wastewater

A treatment method, high-valent chromium technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, neutralized water/sewage treatment, etc. and other problems, to achieve the effect of improving treatment capacity, reducing the production of high-salt wastewater, and achieving obvious treatment effects.

Inactive Publication Date: 2020-05-22
XIAN RUILIAN NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides an industrialized treatment method for high-priced chromium wastewater, which solves the problem that the existing high-priced chromium wastewater needs multi-step treatment, produces toxic hydrazine sulfate in the process, and has low treatment capacity, which is not suitable for large-scale industrial wastewater treatment.

Method used

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  • Industrial treatment method of high-valence chromium wastewater
  • Industrial treatment method of high-valence chromium wastewater
  • Industrial treatment method of high-valence chromium wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A method for industrialized treatment of high-priced chromium wastewater, comprising the following steps:

[0018] Under mechanical stirring, add industrial chromium waste water 2000L and water treatment defoamer BYK2kg in the 5000L reactor, (in the industrial chromium waste water, H 2 CrO 4 The concentration is 22690mg / L, H 2 CrO 4 The calculated amount is 45.38kg=2000L*22690mg / L) Stir evenly, add dropwise 57.69kg of 30% hydrazine hydrate (the molar ratio of hexavalent chromium to 30% hydrazine hydrate is 1:0.75), react at 20°C for 0.5h, Add 46.15 kg of sodium hydroxide to precipitate, and filter after the precipitation is complete, separate the precipitate from the supernatant to obtain a clear water phase, and take the supernatant to detect Cr 总 content, C Cr总 = 0.21 mg / L.

Embodiment 2

[0020] An industrial treatment method for high-valent chromium wastewater, the steps are the same as in Example 1, except that the reaction is carried out at 10°C for 0.5h.

Embodiment 3

[0022] An industrialized treatment method for high-valent chromium wastewater, the steps are the same as in Example 1, except that the reaction is carried out at 30°C for 0.5h.

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Abstract

The invention discloses an industrial treatment method of high-valence chromium wastewater, belonging to the technical field of wastewater treatment. The industrial treatment method comprises the following steps: mixing hexavalent chromium wastewater with an antifoaming agent, adding hydrazine hydrate for a reaction, adding sodium hydroxide for precipitation, carrying out filtering after the precipitation is completed so as to obtain an upper-layer clear water phase, and discharging the upper-layer clear water phase. The method solves the problems that existing high-valence chromium wastewaterneeds multi-step treatment, toxic hydrazine sulfate is generated in the process, treatment capacity is small, and conventional processes are not suitable for large-scale industrial wastewater treatment.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and in particular relates to an industrialized treatment method for high-priced chromium wastewater. Background technique [0002] High-valent chromium (chromium trioxide, dichromic acid, chromic acid) is a commonly used oxidant in industry due to its high oxidation potential, strong oxidation ability, and low price. For example, organic alcohols are oxidized into carboxylic acids and ketones. High-valent chromium (chromium trioxide, dichromic acid, chromic acid). With the expansion of industrial production scale, the discharge of industrial chromium wastewater is increasing year by year, but chromium is one of the heavy metals, how to eliminate the pollution of chromium heavy metals is one of the serious problems we are facing today. [0003] Trivalent chromium has almost no harmful effects on the human body, and no reports of industrial poisoning have been seen. After ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/22
CPCC02F9/00C02F1/70C02F1/66C02F1/001C02F2101/22
Inventor 张洋李启贵胡华院王鹏飞何晓芸霍东升徐亦为吕喜康高仁孝
Owner XIAN RUILIAN NEW MATERIAL CO LTD
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