A method for removing acidic wastewater fe3+ acidity

A technology of acid wastewater and acidity, applied in chemical instruments and methods, water/sewage treatment, neutralized water/sewage treatment, etc., can solve the problem of inconvenient recycling or safe disposal, low alkalinity utilization efficiency, and poor long-term operation effect. and other problems, to achieve the effect of reducing the difficulty of recycling or safe disposal, easy biochemical removal, and reducing the difficulty of recycling

Inactive Publication Date: 2016-05-04
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are various sources of alkalinity, and the neutralization efficiency of soluble substances such as sodium hydroxide is high, but the use cost is high; the use of lime / limestone and other substances with low solubility has relatively low cost, but is often affected by Fe 3+ Hydrolysis precipitation, Fe 2+ The effect of oxidation precipitation and calcium sulfate precipitation, resulting in lower alkalinity utilization, among which, Fe 3+ It is often one of the main forms of acidity in mine acid wastewater, Fe 3+ The adverse effects of hydrolytic precipitation are particularly prominent
When the limestone filtration process is used, the wastewater Fe 3+ Concentration>1mg / L will lead to poor long-term operation effect
When adopting lime / limestone mud mixing process, because Fe 3+ Hydrolysis and precipitation lead to low utilization efficiency of alkalinity, and will produce a large amount of precipitation waste mainly composed of iron and calcium substances mixed with various harmful elements, which is very inconvenient for recycling or safe disposal

Method used

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  • A method for removing acidic wastewater fe3+ acidity
  • A method for removing acidic wastewater fe3+ acidity
  • A method for removing acidic wastewater fe3+ acidity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Processing devices such as figure 2 As shown, the solutions in the acid wastewater pool 1 and the formate concentrated solution pool 2 can enter Fe through the pipelines with valves respectively. 3+ The solution in the hydrolysis sedimentation tank 3 and the lime mud tank 4 can enter the formate solution regeneration tank 5 through a pipeline with a valve, and the Fe 3+ Between the hydrolysis sedimentation tank 3 and the formate brine solution regeneration tank 5, the solution is forwardly or reversely input through a pipeline with a valve as required.

[0028] The concentration of sodium formate in formate concentrate pool 2: 6mol / L.

[0029] Composition of simulated acid wastewater in acid wastewater tank 1: Fe 3+ The acidity is 120mmol / L (equivalent to Fe 3+ Concentration 40mmol / L), H + The acidity is 20mmol / L, the sulfate radical concentration is 86mmol / L, the calcium ion concentration is 6mmol / L, Cu 2+ The concentration is 10mmol / L.

[0030] Sequencing batch...

Embodiment 2

[0034] Processing devices such as image 3 As shown, the outlet of the acid wastewater pool 1 and the outlet of the formate concentrated solution pool 2 pass through the pipeline and the long columnar Fe respectively. 3+ The water inlet at the bottom of the hydrolysis sedimentation tank 3 is connected, Fe 3+ The effluent of the hydrolysis sedimentation tank 3 flows into the left end of the long-trough formate solution regeneration tank 5 through the overflow outlet on the upper part, and the effluent of the limestone mud tank 4 flows into the left end of the formate solution regeneration tank 5 through the outlet at the bottom, and the formic acid The reflux outlet at the right end of the salt solution regeneration tank 5 passes through the pipeline and the Fe 3+ The water inlet at the bottom of the hydrolysis sedimentation tank 3 is connected for returning the formate solution to Fe 3+ The hydrolysis sedimentation tank 3 and the overflow outlet at the upper right end of the...

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Abstract

The present invention relates to the field of environmental protection and water treatment, and specifically to a method for removing Fe3 + acidity of acidic wastewater. In the present invention, a formate regeneration solution is cyclically used to transfer the alkalinity of lime / limestone so as to neutralize and remove Fe3 + acidity of acidic wastewater. By means of the present invention, the difficulty of neutralizing and removing Fe3 + acidity of acidic wastewater by using the alkalinity of lime / limestone is reduced, a highly pure and recyclable Fe3 + hydrolytic precipitate can be obtained, the yield and disposal difficulty of calcium-containing precipitated wastes are reduced, and the disposal difficulty of other pollutants in the acidic wastewater is reduced.

Description

technical field [0001] The invention belongs to the field of environmental protection and water treatment, in particular to a method for removing acidic wastewater Fe 3+ Acidity method. Background technique [0002] When metal sulfides are exposed to air and moisture during ore mining and processing, chemical and biological oxidation occurs, resulting in Fe-containing 3+ , Fe 2+ 、Cu 2+ , Pb 2+ Acidic wastewater containing metal ions such as metals can easily lead to acidification of the receiving water and soil environment and excessive harmful elements. To avoid contamination of the water and soil environment, on the one hand, it is necessary to cover abandoned mines with vegetation, limestone layers, organic matter layers, and water layers to reduce the generation of acidic wastewater at the source; The acid wastewater is treated to ensure that the discharge standard is met. [0003] There are various methods for treating acidic wastewater from mines, mainly includin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/64C02F1/66
CPCC02F1/64C02F1/66
Inventor 黄斌史奕陈欣
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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