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A technology for removing mercury in acidic high-concentration mercury-containing wastewater

A high-concentration, waste water technology, applied in the field of environmental chemistry, achieves obvious environmental and economic benefits, improves the efficiency of the reduction reaction, and is simple in waste water treatment.

Active Publication Date: 2018-02-02
四川深蓝环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of mercury pollution prevention and control in acidic high-concentration mercury-containing wastewater, the purpose of this invention is to find a technology that can remove and recycle mercury in wastewater under acidic conditions, with simple process, easy implementation and quick results

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0016] Embodiment 1: Hg in a certain chemical industry wastewater 2+ The concentration of hydrogen ion in water is 156.86mg / L, and the concentration of hydrogen ion is 0.1mol / L. Take 1L of the waste water in a container with a volume of 2L that is resistant to acid and alkali and has good permeability to ultraviolet light, add 0.2g of sodium chloride solid, react at 20°C and a stirring speed of 120r / min for 15min, and then Add 4 g of fulvic acid to the container, transfer the container to a photochemical reactor, and perform photochemical reduction under the conditions that the initial temperature of the solution is 25°C, the stirring speed is 150r / min, the main wavelength of ultraviolet light is 365nm, and the power of the ultraviolet lamp is 150W. Reaction 2h. After the photochemical reduction reaction is completed, the solid and liquid are separated, and the supernatant is the effluent after treatment, and the Hg in the effluent 2+ The concentration is reduced to 4.70mg / L...

Embodiment 2

[0017] Example 2: COD determination of Ag in waste liquid by online monitoring of effluent from a certain urban sewage treatment plant + , Hg 2+ 、H + , The concentration of hexavalent chromium is 4152mg / L, 4249mg / L, 5.1mol / L, 3082.54mg / L respectively. Firstly, 5L of waste liquid is collected in an acid-alkali-resistant container 1 with a volume of 8L, and 36g of sodium chloride is added to the waste liquid to react for 15min at 20°C and a stirring speed of 180r / min, and the generated AgCl naturally precipitates. At the same time, chloride ions and mercury are subjected to a complex reaction, 75g of activated carbon powder is added to the supernatant after silver removal, and the hexavalent chromium in the waste liquid is reduced to trivalent, reacted at room temperature for 30min, and the solid and liquid are separated. The clear liquid is transferred to a container 2 with a volume of 8L acid and alkali resistance and better ultraviolet light permeability, 400g fulvic acid i...

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Abstract

The invention discloses a method for removing acidic high-concentration mercury-containing waste water. The method includes the following steps that firstly, waste water containing divalent mercury is collected to a reaction vessel which is resistant to acid and alkali and good in ultraviolet permeability, sodium chloride is added into the waste water, a complexation reaction is performed under the stirring condition, fulvic acid is added after the complexation reaction ends, then the vessel is placed in a photo-chemical reaction device, a photo-chemical reduction reaction is performed under the stirring condition, the divalent mercury in the waste water is reduced into mercury protochloride to be recycled, and supernatant obtained after solid and liquid separation is treated effluent. The method solves the problem that the acidic high-concentration mercury-containing waste water pollutes the environment and has the advantages that the technology is simple, implementation is easy and the technology take effect fast, mercury in waste water can be economically and efficiently removed under the acidic condition, mercury in waste water can also be recycled, it is also possible that acid is recycled in the treated effluent, and economic benefits and environmental protection benefits are good.

Description

technical field [0001] The invention belongs to the technical field of environmental chemistry, and in particular relates to a technology for removing mercury in acidic high-concentration mercury-containing wastewater. Background technique [0002] Due to its special physical and chemical properties, mercury is widely used in chlor-alkali chemical plants, non-ferrous metal smelters, pesticide plants and major chemical industries. Additionally, in COD Cr In the determination process, in order to avoid the interference of chloride ions, mercury sulfate is often used as a masking agent. During the production and use of mercury, mercury-containing wastewater with strong toxicity, easy bioaccumulation and difficult biodegradation is inevitably produced. Mercury entering the human body will damage the central nervous system, and also have adverse effects on the mouth, mucous membranes and teeth. Prolonged exposure to high mercury environments can lead to brain damage and death. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/08C02F101/20
CPCC02F1/32C02F1/5236C02F1/70C02F9/00C02F2101/20
Inventor 刘咏周安澜黄科徐凤
Owner 四川深蓝环保科技有限公司
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