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Micro-electrolysis flocculation method for treating acid waste water containing heavy metals in mine

A technology for acid wastewater and heavy metals, applied in mining wastewater treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc.

Inactive Publication Date: 2011-01-19
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a method with simple method, good treatment effect, low cost and easy operation to solve the problem of mine acid wastewater pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A mine wastewater has a copper ion concentration of 81.5mg / L and trace amounts of other heavy metals, and a pH of 4.5. Pass the waste water through pre-precipitation and pass it into the iron-carbon fixed bed with built-in cast iron chips and activated carbon ratio of 1:1 to treat the waste water. After 30 minutes of treatment, the treatment process will not be aerated; The pH of the effluent is 7.1, which can meet the reuse or discharge standard, and the metal recovery rate reaches 99.6%.

Embodiment 2

[0031] The mining wastewater of a mine has a concentration of 92.2mg / L of lead ions, 25.5mg / L of zinc ions and trace amounts of other heavy metals, pH 3.0. After pre-sedimentation and pre-aeration, the wastewater is passed into the iron-carbon aeration bed. The aeration bed is built with 2.5:1 iron-carbon, and the iron is a combination of sponge iron and steel at a ratio of 1:1. The combination of coal ash, the ratio is 1:1, the aeration rate is 1m 3 Gas / m 3 Water.min, stay for 2h; adjust pH to 7.2 after effluent, after solid-liquid separation, effluent lead ion concentration 0.55mg / L, zinc ion concentration 1.33mg / L, pH 7.8, effluent can meet reuse or discharge standard, metal The recovery rate is 99.9%.

[0032] The iron scraps selected by the present invention can be cast iron scraps, and can also be any one of sponge iron, steel, and iron-based alloy scraps containing iron weight percentage ≥ 70%, or their multiple combinations; the activated carbon used can also be It ...

Embodiment 3

[0034] A certain mine wastewater has ion concentrations of lead 63.5mg / L, cobalt 13.5mg / L, nickel 16.3mg / L, and trace amounts of other heavy metals, pH 1.0. Adjust the pH of the waste water to 2.0, and pass it into the iron-carbon fluidized bed after pre-sedimentation and pre-aeration treatment. The fluidized bed is built with 4:1 iron-carbon, a combination of cast iron scraps for iron, sponge iron and steel, and the ratio is 2:1:1, the carbon is a combination of coke, coal and calcium carbide slag, the ratio is 3:1:1, stay for 3 hours, aerate after effluent, the aeration rate is 2m 3 Gas / m 3 Water.min; adjust pH to 8.0 after effluent, and add inorganic flocculant polyaluminium chloride (PAC) 10mg / L, solid-liquid separation, effluent lead ion concentration 0.53mg / L, cobalt ion concentration 0.15mg / L, nickel ion concentration The concentration is 0.21mg / L, the pH is 8.5, the effluent can meet the reuse or discharge standard, and the metal recovery rate can reach 99.9%.

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PUM

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Abstract

The invention discloses a micro-electrolysis flocculation method for treating acid waste water containing heavy metals in mine. The treatment step is as follows: waste water pretreatment, iron-carbon micro-electrolysis and flocculation and precipitation, wherein the waste water is pretreated and then fed into an iron-carbon bed reactor with an iron-carbon mass filling ratio of 1-5 for reacting and staying for 5 mintues-6 hours, and most of heavy metal pollutants in the waste water are removed and recycled through micro-electrolysis reaction; the pH value is regulated to be 6.5-10 by effluent so as to carry out the flocculation and precipitation for further removing impurity ions, and the purification effect of the waste water can be enhanced by adding a new flocculant according to the water quality conditions; and after solid-liquid separation, the effluent of the waste water can be reused due to reaching the standard or discharged. The invention has the advantages of low treatment cost, small occupied area, high recovery of the heavy metals in the waste water and the like, and has wide application prospect in the field of treating the waste water in mine.

Description

technical field [0001] The invention relates to the fields of environmental protection technology and water treatment technology, in particular to a method for treating acid wastewater from heavy metal mines. Background technique [0002] Most of the ferrous metal ores and non-ferrous metal ores contain a certain amount of sulfur or symbiotic sulfides. The sulfide minerals are oxidized, weathered, decomposed, and water-gas-acid-mineral reactions in nature to form mines. Unique acidic wastewater. The cause of acid waste water is due to the oxidation of sulfide minerals under the dissolution of pit water and atmospheric precipitation. This oxidation process is mainly completed with the participation of sulfide ore bacteria in the deposit to generate sulfuric acid, ferrous sulfate and ferric sulfate. These products further interact with other metal sulfides to form sulfates that are dissolved in water to form acidic wastewater containing heavy metal ions. [0003] At present,...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F103/10
Inventor 徐晓军罗发生李新征陈映雪马玲肖许
Owner KUNMING UNIV OF SCI & TECH
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