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Treatment method for acidic wastewater

A technology of acidic wastewater and treatment method, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of low removal rate of heavy metals, increased treatment cost, and high removal rate of heavy metals , to reduce the biochemical activity inhibition rate, improve the precipitation rate, and achieve the effect of high removal efficiency

Active Publication Date: 2017-03-15
铜仁市万山区盛和矿业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The usual treatment method is milk of lime neutralization method, which makes heavy metal ions precipitate out as hydroxides. This method is simple to operate and easy to realize the separation of heavy metals, but the amount of lime is large, which increases the treatment cost and the removal rate of heavy metals is low. At the same time, Generate a large amount of waste residue, bringing potential re-pollution risks to the environment
[0004] Through continuous research by industry personnel, it has been found that microbial treatment of acidic wastewater has a high removal rate of heavy metals and low cost. Among them, sulfate-reducing bacteria are used to reduce sulfate to H through the biological reduction reaction of dissimilating sulfate. 2 S, and use some microorganisms to convert H 2 S is oxidized to elemental sulfur, and the resulting sulfide combines with heavy metals to precipitate metal sulfide. However, due to the complexity of factors affecting the biochemical process of sulfate-reducing bacteria, there are still many technical problems. Among them, H in acidic environment 2 S. The toxicity of heavy metals and the inhibition of sulfate-reducing bacteria by COD content in water are particularly prominent, which in turn affects the removal rate of heavy metals and consumes a large amount of sulfate-reducing bacteria, which is not conducive to the application of sulfate-reducing bacteria in the practice of treating acidic wastewater in mines.

Method used

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  • Treatment method for acidic wastewater

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Effect test

Embodiment 1

[0019] A treatment method for acidic wastewater, the method is: add a pretreatment agent to the acidic wastewater and stir for 0.8h, the stirring speed is 70r / min, after standing still for 3.5h, the temperature is raised to 36°C, and the fermentation broth of sulfate-reducing bacteria is added , sealed and fermented to a COD concentration of 1.5g / L, filtered to obtain solids and filtrate.

[0020] Described acid waste water, its pH is 5.5.

[0021] Described pretreatment agent, its weight volume ratio with acid waste water is 1:4.

[0022] The raw materials of the pretreatment agent by weight are: 7kg of corn dregs, 6kg of sorghum stalks, 1kg of peanut skins, 4kg of monoamine oxidase, and 0.5kg of soil.

[0023] The preparation method of the pretreatment agent is as follows: put corn dregs, sorghum stalks, and peanut skins in the sedimentation tank, and mix them evenly, after sealing for 5 days, add monoamine oxidase and stir evenly, cover the surface with soil, seal for 11 d...

Embodiment 2

[0027] A treatment method for acidic wastewater, the method is as follows: add a pretreatment agent to the acidic wastewater and stir for 0.6h, the stirring speed is 100r / min, after standing for 4h, the temperature is raised to 35°C, and the fermentation broth of sulfate-reducing bacteria is added, Seal the fermentation until the COD concentration is 1g / L, filter to obtain solids and filtrate.

[0028] Described acid waste water, its pH is 6.7.

[0029] Described pretreatment agent, its weight volume ratio with acid waste water is 1:4.

[0030] The raw materials of the pretreatment agent are by weight: 7kg of corn dregs, 6kg of sorghum stalks, 3kg of peanut skins, 5kg of monoamine oxidase, and 0.5kg of soil.

[0031] The preparation method of the pretreatment agent is as follows: put corn dregs, sorghum stalks, and peanut skins in a sedimentation tank, mix them uniformly, and after sealing for 7 days, add monoamine oxidase and stir evenly, cover the surface with soil, seal fo...

Embodiment 3

[0035] A treatment method for acidic wastewater, comprising the following steps: adding a pretreatment agent to the acidic wastewater and stirring for 0.5 hours at a stirring speed of 60 r / min, after standing for 3 hours, heating up to 28°C, adding sulfate-reducing bacteria fermentation broth, Sealed fermentation to COD concentration of 1.8g / L, filtered to obtain solids and filtrate.

[0036] Described acid waste water, its pH is 5.0.

[0037] Described pretreatment agent, its weight volume ratio with acid waste water is 1:5.

[0038] The raw materials of the pretreatment agent by weight are: 3kg corn dregs, 6kg sorghum stalks, 2kg peanut skins, 7kg monoamine oxidase, and 0.6kg portion of soil.

[0039] The preparation method of the pretreatment agent is as follows: put corn dregs, sorghum stalks, and peanut skins in the sedimentation tank, and mix them evenly. After sealing for 5 days, add monoamine oxidase and stir evenly, cover the surface with soil, seal for 112 days, and...

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Abstract

The invention relates to acidic mine wastewater treatment technology and particularly relates to a treatment method for acidic wastewater. Crop residues which have been pretreated are added to the acidic wastewater with stirring for 0.5-1 h at stirring rate of 60-120 r / min; allowing the wastewater to stand for 3-4 h, heating the wastewater to 32-38 DEG C, adding a sulfate reducting bacteria fermentation liquid to perform sealed fermentation until concentration of COD is less than 1.8 g / L; and filtering the mixture to obtain solid and filtrate. The treatment method is high in removal rate of heavy metals which are easy to recover, is low in cost, and has no pollution.

Description

technical field [0001] The invention relates to mine acid wastewater treatment technology, in particular to a treatment method for acid wastewater. Background technique [0002] Acidic wastewater comes from mines during the mining, transportation, waste rock discharge, and tailings storage process to form a liquid containing sulfate and heavy metal ions through the oxidation of air and bacteria. If it is discharged directly, it will cause water pollution and inhibit the growth of microorganisms in the water. Then destroy the ecological environment, so the problem of acid wastewater treatment needs to be solved urgently. [0003] The usual treatment method is milk of lime neutralization method, which makes heavy metal ions precipitate out as hydroxides. This method is simple to operate and easy to realize the separation of heavy metals, but the amount of lime is large, which increases the treatment cost and the removal rate of heavy metals is low. At the same time, A large a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 袁再六
Owner 铜仁市万山区盛和矿业有限责任公司