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Treatment method of mercury-containing wastewater

A treatment method and technology for wastewater, applied in water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem that the mercury removal process cannot stably meet the discharge requirements, and achieve good economic benefits and social benefits. Benefit, low consumption of chemicals, simple process effect

Active Publication Date: 2011-08-10
李开明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, the discharge standard of mercury-containing wastewater in the chemical industry has been further improved. The current mercury removal process cannot stably meet the discharge requirements (0.005mg / L), and the treatment method of mercury-containing wastewater needs to be improved urgently.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0025] Raise the mercury-containing waste water that the original Hg content is 40.54mg / L to the neutralizer, adjust its pH to neutral and enter the reactor by gravity, and add an industrial grade vulcanizing agent (Na 2 S), aluminum, iron, calcium sulfate and activated carbon composite additives (aluminum ion: iron ion: calcium ion: activated carbon weight ratio = 1: 0.7: 0.5: 3.8), the supernatant after staying in the sedimentation tank for 20min Self-flow enters the water storage and lifting tank, and is lifted by the pump to achieve continuous water outlet through the sand filter column with a particle size of 0.7-1.2mm. The outlet water is measured by cold atomic absorption method using F732 cold atomic mercury detector according to GB7468-87 standard, and the mercury content is 0.00012- 0.00036mg / L, meeting the emission requirements of the national standard below 0.005mg / L.

[0026] The compounding aid after use can fix Na 2 S is recycled in the system, and when the mer...

Embodiment 2

[0028] Elevate the mercury-containing wastewater with an original Hg content of 1.27mg / L to the neutralizer, adjust its pH to neutral, then flow into the reactor by itself, and add industrial-grade sulfurizing agent (NaHS), aluminum, iron, and calcium into the reactor Halide and activated carbon compound additives (aluminum ion: iron ion: calcium ion: activated carbon weight ratio = 1: 1.2: 0.3: 5.0), after staying for 30 minutes, the supernatant flows into the water storage lifting tank by itself, and is pumped The continuous effluent is realized through the precision filter, and the effluent is measured by the cold atomic absorption method using the F732 cold atom mercury detector according to the GB7468-87 standard, and the mercury content is 0.00042-0.0014mg / L. Meet the emission requirements of the national standard less than 0.005mg / L.

[0029] The compounding aid after use can fix Na 2 S is recycled in the system, and when the mercury content in the granular sediment re...

Embodiment 3

[0031] Elevate the mercury-containing wastewater with an original Hg content of 0.066mg / L to the neutralizer, adjust its pH to neutral, then flow into the reactor by itself, and add industrial-grade sulfurizing agent (NaHS), aluminum, iron, and calcium into the reactor The composite additive composed of sulfate and activated carbon (aluminum ion: iron ion: calcium ion: activated carbon weight ratio = 1: 1.0: 0.4: 4.5), after staying for 15 minutes, the supernatant enters the water storage lifting tank and is lifted by the pump The sand filter column with a particle size of 0.7-1.2mm realizes continuous effluent, and the effluent is measured by cold atomic absorption method and F732 cold atom mercury detector according to GB7468-87 standard, and the mercury content is 0.00037-0.00101mg / L. Meet the emission requirements of the national standard less than 0.005mg / L.

[0032] The used composite additive can fix the vulcanizing agent to be recycled in the system, and when the mercu...

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Abstract

A treatment method of mercury-containing wastewater comprises the following steps: a) adjusting the pH value of wastewater to be treated to 7; b) enabling the mercury-containing wastewater to flow automatically in a reactor, and pouring a vulcanizing agent and a composite additive in the reactor according to a ratio to ensure that the Hg in the wastewater is converted to HgS precipitate particles; c) leading the supernatant of the wastewater to enter a water-storing lifting tank and then entering a separator through a lift pump to realize the separation of particles and water; and d) enabling the composite additive to be used to fix the vulcanizing agent and to be recycled in the system, and when the content of mercury in the precipitate particles reaches 3-5%, the precipitate particles are discharged into a slag-storing tank for recycling. The invention adopts the chemical method to convert Hg directly to water-insoluble HgS precipitates, a coagulant and an organic flocculant are not required to be added and the mercury-removing medicament can be recycled in the system, thus the treatment cost can be reduced and new pollutants can not be generated in the treatment process. The method is suitable for both high concentration mercury-containing wastewater and low concentration mercury-containing wastewater.

Description

technical field [0001] The invention relates to a method for treating mercury-containing wastewater. Background technique [0002] A large amount of industrial wastewater will be produced in the process of industrial production. With the rapid development of the chemical industry, the problem of heavy metal pollution is becoming more and more serious, especially the treatment of mercury-containing wastewater has received great attention internationally. In recent years, the discharge standard of mercury-containing wastewater in the chemical industry has been further improved. The current mercury removal process cannot stably meet the discharge requirements (0.005mg / L), and the treatment method of mercury-containing wastewater needs to be improved urgently. Contents of the invention [0003] The purpose of the present invention is to provide a treatment method for mercury-containing wastewater, which can effectively remove mercury contained in water, make the effluent meet ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/62C02F101/20
Inventor 李开明
Owner 李开明
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