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Slow-release compound flocculant for reducing acidity of mine water

A composite flocculant and flocculant technology, applied in mining wastewater treatment, flocculation/sedimentation water/sewage treatment, water/sewage treatment, etc. Enhanced effect

Active Publication Date: 2015-07-15
INST OF AGRI ENVIRONMENT & RESOURCE SHANXI ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN 101935621B discloses a gene engineering bacterium of acidophilic Thiobacillus ferrooxidans and its application. The ferrous oxide electron transport chain protein CYC1 gene is introduced into acidophilic Thiobacillus ferrooxidans by transgenic method to improve its oxidation rate of Fe. 2+ The ability of ions, and mentioned the application of the bacteria in the treatment of acidic mine water, but its role is relatively single, and it has not been combined with other inorganic methods to treat mine water simultaneously
CN 103466842A An acid mine water treatment method is to use a three-stage treatment device with a drop to treat mine water, and use cheap materials such as fly ash and fruit shells as filter materials, which can effectively solve the acid mine water pollution problem in mining areas, but the The investment cost of the method is relatively large, and the operation steps are relatively cumbersome
At present, limestone flocculants are widely used to treat acidic mine water, but the difficult-to-precipitate ferric hydroxide and ferrous hydroxide flocs produced during the treatment process are coated on the surface of lime particles, which greatly reduces the neutralization efficiency. It is difficult to meet the discharge requirements stipulated by the state, and the removal effect on iron is low, and the precipitation is also large, which is easy to cause secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take 40 Kg of peat, 10 Kg of glucose, 30 Kg of bone glue, 7 Kg of activated carbon, and 0.03 Kg of ferrous sulfate, stir and mix evenly, add 20-28 L of water, keep stirring for 20-30 minutes, and perform disc or extrusion granulation. Dry to obtain an inorganic composite flocculant with a particle size of 0.2-2.5 mm.

[0028] Take 7.0 Kg of starch and 7.0 Kg of beef extract, add 1.0 Kg of Desulfovibrio bacteria agent, 1.0 Kg of colorless sulfur bacteria agent (including 0.4 Kg of Thiobacillus ferrooxidans agent and 0.6 Kg of acidophilus Thiobacillus thiooxidans agent) , Gluconobacter bacterial agent 0.5 Kg, mix evenly (the number of live bacteria of each bacterial agent is not less than 2×10 7 ~2×10 8 per gram), then add 30-40% of the total weight of sterile water, stir and ferment at 28-36°C for 16-24 hours to make a bacterial liquid, and the total number of viable bacteria reaches 6×10 9 ~1×1011 pcs / g.

[0029] Pour 14.5 Kg of the above-mentioned fermented mixed cu...

Embodiment 2

[0032] Take 35 Kg of fly ash, 15 Kg of glucose, CaCl 2 28 Kg, 9 Kg of zeolite, 0.05 Kg of ferrous sulfate, stir and mix evenly, add 20-28 L of water, continue to stir for 20-30 min, carry out disc or extrusion granulation, and dry to obtain a particle size of 0.2-2.5 mm Inorganic composite flocculant.

[0033] Take 5.0 Kg of starch, 2.0 Kg of soluble cellulose, and 7.0 Kg of beef extract, add 1.0 Kg of Desulfovibrio bacteria agent, 1.0 Kg of colorless sulfur bacteria agent (of which 0.5 Kg of Thiobacillus ferrooxidans agent, acidophilic sulfur oxidized sulfur Bacillus bacteria agent 0.5 Kg), Gluconobacter bacteria agent 0.6 Kg and mixed evenly (the number of live bacteria of each agent is not less than 2×10 7 ~2×10 8 per gram), then add 30-40% of the total weight of sterile water, stir and ferment at 28-36°C for 16-24 h to make a bacterial liquid, and the total number of viable bacteria reaches 6×10 9 ~1×10 11 pcs / g.

[0034] Pour 13 Kg of the above-mentioned fermented m...

Embodiment 3

[0037] Take 15 Kg of fly ash, 15 Kg of peat, 20 Kg of glucose, CaCl 2 30 Kg, 3 Kg of coal gangue, 7 Kg of activated carbon, 0.04 Kg of ferrous sulfate, stir and mix evenly, add 20-28 L of water, keep stirring for 20-30 min, carry out disc or extrusion granulation, dry, and obtain the particle size 0.2-2.5 mm inorganic composite flocculant.

[0038] Take 6.0 Kg of starch, 2.0 Kg of soluble cellulose, and 6.0 Kg of beef extract, add 1.0 Kg of Desulfovibrio bacteria agent, 1.0 Kg of colorless sulfur bacteria agent (of which 0.3 Kg of Thiobacillus ferrooxidans agent, acidophilic sulfur oxidized sulfur Bacillus bacteria agent 0.7 Kg), Gluconobacter bacteria agent 0.3 Kg and mixed evenly (the number of live bacteria of each agent is not less than 2×10 7 ~2×10 8 per gram), then add 30-40% of the total weight of sterile water, stir and ferment at 28-36°C for 16-24 h to make a bacterial liquid, and the total number of viable bacteria reaches 6×10 9 ~1×10 11 pcs / g.

[0039] Pour 1...

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Abstract

The invention discloses a slow-release compound flocculant for reducing acidity of mine water. The slow-release compound flocculant is prepared from the following raw materials in percentage by weight: 87wt%-95wt% of an inorganic compound flocculant and 5wt%-13wt% of a soluble coating material, wherein the soluble coating material wraps the inorganic compound flocculant; the inorganic compound flocculant is a mixture of a microbial carbon source, a coagulant aid and an adsorbent; the soluble coating material is a culture medium mixed with a microbial agent; and the microbial agent is a mixed agent prepared from a desulfovibrio agent, a colourless sulfur bacteria agent and a gluconobacter agent. According to the slow-release compound flocculant, the characteristics of inorganic and biological flocculants are integrated; a chemical dosing mode is improved; the interaction efficiency of various flocculants is increased by multi-step dissolving and slow-release processes; and the efficiency of the agent is improved.

Description

technical field [0001] The invention relates to a water treatment agent, in particular to a water treatment flocculant for acidic mine water. Background technique [0002] Mine water with a pH value of less than 5.5 is called acid mine water, which is the main water pollutant produced in the coal mining process and one of the factors that cause the deterioration of the ecological environment of mine water. Oxidation of sulfide in coal and oxidation of ferrous ions are the main causes of acidification of mine water. [0003] At present, the main treatment methods for acid mine water include neutralization method, artificial wetland method, sulfide precipitation method and microbial method. The neutralization method is to neutralize the hydrogen ions in the wastewater by adding limestone or lime. The disadvantage is that the cost is high, and the calcium sulfate residue generated by the reaction is more, which is easy to cause secondary pollution; the artificial wetland metho...

Claims

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Application Information

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IPC IPC(8): C02F3/34
CPCC02F1/28C02F1/281C02F1/283C02F1/286C02F1/52C02F1/5236C02F1/54C02F3/345C02F2103/10C02F2305/04C02F2305/14
Inventor 郜春花卢晋晶张强李建华靳东升卢朝东吕薇
Owner INST OF AGRI ENVIRONMENT & RESOURCE SHANXI ACAD OF AGRI SCI
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