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Mercury removal agent for treating waste water containing mercury

A mercury-removal agent and mercury-removal technology, applied in anaerobic digestion treatment, water/sludge/sewage treatment, mercury compounds, etc., can solve the problems of difficult filtration, low degree of industrialization, poor removal effect, etc. Simple, easy to operate, low cost effect

Inactive Publication Date: 2013-04-17
CHANGZHOU YAHUAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN00131216.2 discloses a method for removing arsenic, lead, chromium, cadmium, and mercury in drinking water. This patent uses the method of adding bleaching powder, ferrous sulfate, and sodium hydroxide to the treated water to remove mercury. The principle of mercury is to make mercury generate Hg 2 CrO 4 and HgO, and then use the characteristics of strong adsorption capacity of ferric hydroxide and ferrous hydroxide in alkaline environment to carry out adsorption and precipitation. This method is difficult to apply in actual production, with low degree of industrialization, poor removal effect, difficult filtration, especially difficult Treatment of High Concentration Mercury Wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The mass percentage is: 30% of Thiobacillus engineering bacteria, 10% of sodium bicarbonate, and 60% of cyclohexyl formaldehyde are compounded into a mercury removal agent, and the compounded mercury removal agent is added to the mercury-containing concentration of 1000mg / L In industrial wastewater, the mass ratio of dosage to industrial wastewater is 1:100, and it is fermented under anaerobic conditions (dissolved oxygen below 0.3mg / L) for 30 hours. The mercury in the wastewater can be converted into mercury vapor, and then absorbed by hydrogen sulfide gas to form mercury sulfide precipitation, so as to achieve the purpose of mercury removal. The mercury removal rate is as high as 99.95%, which meets the national first-level emission standard.

Embodiment 2

[0027] The mass percentage is: 75% of iron-oxidizing bacteria, 10% of iron sulfite, and 15% of o-phthalaldehyde are compounded into a mercury removal agent, and the compounded mercury removal agent is added to the industrial In wastewater, the mass ratio of dosage to industrial wastewater is 1:200, and it is fermented under anaerobic conditions (dissolved oxygen below 0.3mg / L) for 35 hours. The mercury in the wastewater can be converted into mercury vapor, and then absorbed by hydrogen sulfide gas to form mercury sulfide precipitation, so as to achieve the purpose of mercury removal. The mercury removal rate is as high as 99.93%, which meets the national first-level emission standard.

Embodiment 3

[0029] The mass percentage is: 60% demercuric bacilli, 30% potassium nitrate, and 10% paraformaldehyde are compounded into a mercury removal agent, and the compounded mercury removal agent is added to industrial wastewater containing mercury at a concentration of 50mg / L , the mass ratio of dosage to industrial wastewater is 1:300, and it is fermented under anaerobic conditions (dissolved oxygen below 0.3mg / L) for 28 hours. It can convert the mercury in the waste water into mercury vapor, and then absorb it with hydrogen sulfide gas to form mercury sulfide precipitation, so as to achieve the purpose of mercury removal. The mercury removal rate is as high as 99.99%, which meets the national first-level emission standard.

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Abstract

The invention discloses mercury removal agent for treating waste water containing mercury, which is formed by compounding engineering bacillus, inorganic matters and organic aldehyde. The engineering bacillus includes one or two of engineering acidithiobacillus, iron-oxidizing bacteria, mercury removal bacillus and pseudomonas cepacia, the inorganic matters include one or two of sodium chloride, sodium bicarbonate, sodium bisulfate and ferrous sulfate, and the organic aldehyde includes one or two of cyclohexyl formaldehyde, trioxymethylene, O-phthalic aldehyde and p-fluoro benzaldehyde. Undera condition with a pH (potential of hydrogen) value ranging from 6.0 to 8.0, the composite mercury removal agent is added into waste water with mercury concentration ranging from 50mg / L to 1000mg / L, the mass ratio of the fed mercury removal agent to the waste water ranges from 1:100 to 1:500, fermentation is carried out for 24 to 48 hours under an anaerobic condition, mercury in the waste water can be converted into mercury steam, the mercury steam is absorbed by hydrogen sulfide gas to generate precipitated mercuric sulfide, and accordingly the purpose of removing the mercury is achieved.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a mercury-containing wastewater treatment method, and belongs to the technical field of sewage treatment in environmental protection. Background technique [0002] Mercury-containing wastewater mainly comes from non-ferrous metal smelters, chemical plants, pesticide plants, paper mills, dye plants, and thermal instrumentation plants. Elemental mercury is basically non-toxic, but mercuric acid in inorganic mercury is a highly toxic substance, and phenylmercury in organic mercury is decomposed quickly and has little toxicity; methylmercury is easily absorbed into the human body, not easy to degrade, and excreted very slowly. Especially easy to accumulate in the brain, the most toxic, such as Minamata disease is caused by methylmercury poisoning. At present, the more popular methods for treating mercury-containing wastewater include: chemical precipitation, electrolysis, ion exchang...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/28C01G13/00C02F101/20
Inventor 雷春生雷思宇龙海燕
Owner CHANGZHOU YAHUAN ENVIRONMENTAL PROTECTION TECH