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A process for repairing mercury-containing wastewater

A waste water and process technology, applied in the direction of water pollutants, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem that the effluent concentration is difficult to meet the discharge standard, the concentration of mercury ions cannot be reduced very low, and waste water treatment Incomplete and other problems, to achieve the effect of improving the adhesion of bacterial strains, reducing the amount of sludge produced, and reducing the availability

Active Publication Date: 2020-10-30
杭州富阳优信科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the precipitation method is that it is easy to cause water hardening, and the wastewater containing low concentration of mercury is not completely treated, which easily leads to secondary pollution; affected by the precipitant, environmental conditions and process control parameters, the concentration of the effluent is difficult to meet the discharge standard, so it is still needs further processing
The disadvantage of the electrolysis method is that the concentration of mercury ions in the water cannot be reduced very low, the power consumption is large, the investment cost is high, and mercury vapor is easily generated, causing secondary pollution.
The disadvantage of the activated carbon adsorption method is that the supply of activated carbon is relatively tight, the regeneration equipment is less, and the regeneration cost is high.
The disadvantages of biochemical treatment are low efficiency and difficult strain selection

Method used

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  • A process for repairing mercury-containing wastewater

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Effect test

Embodiment 1

[0030] A process for repairing mercury-containing wastewater, which includes the following steps: 1) pretreatment: mercury-containing wastewater is filtered and precipitated to remove large particles and flocs, and then adjust the pH to 6.5-7.2; 2) biological treatment: pretreatment The final wastewater enters the bioremediation tank, and the compound bacterial agent is added according to the amount of 2g per cubic meter of wastewater, and the treatment time is 96 hours.

[0031] The preparation method of described composite bacterial agent comprises the steps:

[0032] 1) The fermentation broth of Pseudomonas putida, Bacillus licheniformis, Enterobacter cloacae, Sporospora thermophila and Bacillus cereus in a volume ratio of 3:3:2:2:1 Mix evenly to obtain a mixed fermentation liquid, and then concentrate to one-fifth of the original volume to obtain a concentrated bacterial liquid; the fermentation liquid of Pseudomonas putida, Bacillus licheniformis, Enterobacter cloacae Th...

Embodiment 2

[0037] A process for repairing mercury-containing wastewater, which includes the following steps: 1) pretreatment: mercury-containing wastewater is filtered and precipitated to remove large particles and flocs, and then adjust the pH to 6.5-7.2; 2) biological treatment: pretreatment The final waste water enters the bioremediation pool, and the compound bacterial agent is added according to the amount of 3g per cubic meter of waste water, and the treatment time is 72 hours.

[0038] The preparation method of described composite bacterial agent comprises the steps:

[0039] 1) The fermentation broth of Pseudomonas putida, Bacillus licheniformis, Enterobacter cloacae, Sporospora thermophila and Bacillus cereus in a volume ratio of 5:5:3:3:2 Mix evenly to obtain a mixed fermentation liquid, and then concentrate to one-fifth of the original volume to obtain a concentrated bacterial liquid; the fermentation liquid of Pseudomonas putida, Bacillus licheniformis, Enterobacter cloacae ...

Embodiment 3

[0044] Gradient test determines the amount of compound bacterial agent added:

[0045] Set up two groups: Hg 2+ The concentration is 20mg / L and Hg 2+ The concentration is 50mg / L. Treatment process is with reference to embodiment 1; Mercury degradation rate=(Hg before processing 2+ Content - Hg after treatment 2+ content) / Hg before treatment 2+ Content × 100%. attached figure 1 In the process, multiple gradient tests of the addition amount of compound bacteria were set up, and it was found that at 1g / m 3 up to 2g / m 3 , Hg 2+ The removal effect is obviously improved, but 3g / m 3 After, Hg 2+ There is no obvious change, so the best addition amount is 2-3g / m 3 .

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Abstract

The invention belongs to the field of wastewater treatment, and discloses a process for restoring mercury-containing wastewater. The process comprises the following steps of 1): pretreatment: filtering and depositing the mercury-containing wastewater, removing a large-particle substance and floccule, and then regulating pH (potential of Hydrogen) to be 6.5 to 7.2; 2), biological treatment: making the pretreated wastewater subjected to the pretreatment enter a biological restoration pool, adding a compound microbial inoculum according to the amount that 2g to 3g is added into the wastewater per cubic meter, and lasting a treatment time for 72 to 96 hours. A method for restoring the mercury-containing wastewater, which is provided by the invention, is simple and convenient to operate, is economical, high-efficiency, environment-friendly and low-cost, and is wide in application range; the purpose of environment-friendly and green restoration can be realized.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a process for repairing mercury-containing wastewater. Background technique [0002] Mercury, commonly known as mercury, is the only liquid heavy metal element that exists under normal temperature and pressure conditions. Some people list mercury as one of the three most dangerous metal elements, and the U.S. Environmental Protection Agency lists mercury as one of 129 hazardous chemicals, mainly because of its high toxicity, persistence, bioaccumulation, and long-distance transmission specialty. The source of mercury in water is mainly due to the improper application of mercury treatment or the production of mercury mines, gold mines, chlor-alkali chemical plants, amalgam recovery of precious metals, non-ferrous metal smelters, pesticide factories, batteries, fluorescent tubes, and thermometers. , pharmaceuticals, cosmetics, hospital laboratories, etc. also have ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/34C02F101/20
CPCC02F3/34C02F3/348C02F2101/20
Inventor 金文忠
Owner 杭州富阳优信科技有限公司
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