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Method for treatment of mercury-containing wastewater by superconducting magnet magnetic field intensified sulfuration process

A magnetic field strengthening, superconducting magnet technology, applied in the fields of magnetic field/electric field water/sewage treatment, chemical instruments and methods, water/sewage treatment, etc. , the problem of high sediment moisture content, to achieve the effect of shortening the reaction settling time, using a large space, and increasing the settling rate

Inactive Publication Date: 2015-12-23
CHINESE RES ACAD OF ENVIRONMENTAL SCI +1
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  • Summary
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for treating mercury-containing wastewater by means of a superconducting magnet magnetic field-enhanced sulfidation method to solve the problems of high sulfide dosage, low mercury removal rate, settling velocity of sulfide slag and Slow filtration speed, high moisture content of sediment, etc.

Method used

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Embodiment 1

[0025] In this embodiment, in a fully mixed reactor, 0.5 g / L iron sulfide is added to 50 mg / L (calculated as Hg) of mercury-containing water, pH=6.5, and the magnetic field used is a superconducting magnet magnetic field, and the magnetic field strength is about 3T . Under the condition of magnetic field, iron sulfide can remove 93% of mercury within 1.0h. However, in the absence of a magnetic field, only 80% of mercury can be removed even after 1.5 hours of reaction. In the presence of a superconducting magnetic field, the conductivity of the solution increases by 22%, and the potential decreases by 12%. After being treated by the superconducting magnetic field, the filtration speed of mercury sulfide waste liquid is increased by 38%.

Embodiment 2

[0027] In this embodiment, in a fully mixed reactor, 0.5 g / L copper sulfide is added to 40 mg / L (in Hg) of mercury-containing water, pH=8.5, the magnetic field used is a superconducting magnet magnetic field, and the magnetic field strength is about 5T . Under the condition of magnetic field, iron sulfide can remove 96% of mercury within 0.5h. In the absence of a magnetic field, only 85% of mercury can be removed even after 1.5 hours of reaction. In the presence of a superconducting magnetic field, the conductivity of the solution increases by 27%, and the potential decreases by 15%. After being treated by the superconducting magnetic field, the filtration speed of mercury sulfide waste liquid is increased by 38%.

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Abstract

The invention relates to a method for treatment of mercury-containing wastewater by a superconducting magnet magnetic field intensified sulfuration process. The method adopts a completely mixed reactor, a metal sulfide is added into mercury-containing wastewater, a magnetic field is applied around the completely mixed reactor to realize rapid precipitation reaction of the metal sulfide and mercury, so that the water can be purified. According to the invention, under the action of the superconducting magnet strong magnetic field, the conductivity of the solution increases, the electric potential decreases, the flocculating settling speed and filtration speed of sulfide residue are enhanced, and the utilization rate of sulfurizing agent is also increased. The method for treatment of mercury-containing wastewater by the superconducting magnet magnetic field intensified sulfuration process provided by the invention can be used for removal of mercury pollutants in groundwater, industrial wastewater and other water bodies.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and relates to a mercury-containing treatment method for industrial waste water and underground drinking water, and more particularly relates to a method for treating mercury-containing waste water by means of a superconducting magnet magnetic field enhanced vulcanization method. technical background [0002] Among non-ferrous metals, mercury is rarer than antimony, and its total reserves in the earth's crust are 1.6×10 11 t, but 99.98% are in a dispersed state and cannot be utilized, and only 0.02% are enriched in deposits that can be mined. Mercury China has large reserves of mercury and is one of the main mercury-producing countries in the world. Mercury has the characteristics of large specificity (13.546), low melting point (-38.87°C), high boiling point (356.95°C), good electrical conductivity and uniform expansion coefficient, etc. , so that it is widely used in the fields of indu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/48C02F1/52C02F1/62
Inventor 赵颖李英军席北斗高如泰刘文芳李瑞李晓光彭星杨天学张慧郝艳
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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