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Method for purifying slime water by compounding biological and abiological flocculants of coal

A technology of biological flocculant and coal slime water, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as interference, inability to achieve large-scale use, etc., and achieve reduced conditions The effect of limiting, reducing usage, and reducing secondary pollution

Active Publication Date: 2014-07-23
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Microbial flocculants have the characteristics of good flocculation, degradability, no secondary pollution, safety and harmlessness, etc. However, microbial flocculants are easily disturbed by toxic substances and have good flocculation effects in the laboratory, but large-scale use cannot be achieved

Method used

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  • Method for purifying slime water by compounding biological and abiological flocculants of coal
  • Method for purifying slime water by compounding biological and abiological flocculants of coal
  • Method for purifying slime water by compounding biological and abiological flocculants of coal

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0028] 1) Take 90mL of well-stirred coal slime water, and then add 2% CaCl 2 Coagulant aid 3mL, stir with a magnetic slow speed stirrer for 1min;

[0029] 2) Add 2mL of coal bioflocculant, add coal slime water to 100mL, adjust the pH value of coal slime water to 5 with a pen-type pH meter, then stir at a slow speed with a magnetic stirrer for 5min, and add 0.05mL of non-biological flocculant polyacrylamide , stir well.

[0030] 3) Stand still for 30 minutes to absorb the supernatant, measure the absorbance value of the supernatant at 660nm with a UV-5100 ultraviolet spectrophotometer, and obtain a flocculation rate of 93.57%. When other conditions remained unchanged, only 2 mL of Phanerochaete chrysosporium was added, and the flocculation rate was 56.65%.

example 2

[0032] 1) Take 90mL of well-stirred coal slime water, and then add 2% CaCl 2 Coagulant aid 2mL, stir with a magnetic slow speed stirrer for 1min;

[0033] 2) Add 1mL of coal bioflocculant, add more coal slime water to 100mL, adjust the pH value of the coal slime water to 7 with a pen-type pH meter, then stir at a slow speed with a magnetic stirrer for 5min, add non-biological flocculant polyacrylamide 0.05mL , stir well.

[0034] 3) Stand still for 30 minutes to absorb the supernatant, measure the absorbance value of the supernatant at 660nm with a UV-5100 ultraviolet spectrophotometer, and obtain a flocculation rate of 93.23%. When other conditions remained unchanged, only 1 mL of Phanerochaete chrysosporium was added, and the flocculation rate was 61.09%.

example 3

[0036] 1) Take 90mL of well-stirred coal slime water, and then add 2% CaCl 2 Coagulant aid 1mL, stir with a magnetic slow speed stirrer for 1min;

[0037] 2) Add 3mL of coal bioflocculant, add coal slime water to 100mL, adjust the pH value of the coal slime water to 6 with a pen-type pH meter, then stir slowly for 5min with a magnetic stirrer, and add 0.05mL of non-biological flocculant polyacrylamide , stir well.

[0038] 3) Stand still for 30 minutes to absorb the supernatant, measure the absorbance value of the supernatant at 660nm with a UV-5100 ultraviolet spectrophotometer, and obtain a flocculation rate of 85.81%. When other conditions remained unchanged, only 3mL of Phanerochaete chrysosporium was added, and the flocculation rate was 65.63%.

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Abstract

The invention relates to a method for purifying slime water by compounding biological and abiological flocculants of coal. The method comprises the following steps: by taking polyacrylamide (PAM) and phanerochaete chrysosporium which are in the volume ratio of 1:X as compounding flocculants, adding 1ml to 4ml of CaCl2, which accounts for 2% of the mass percent of the compounding flocculants under a certain slime water concentration; regulating the PH (Potential Of Hydrogen) of the slime water to reach 4 to 8 and other external conditions; and carrying out flocculation sedimentation on the slime water under a series of biological and abiological actions. According to the method, the adding quantity of the abiological flocculants of the coal is reduced while the flocculation effect of the slime water in a coal preparation plant is not influenced, so that the limits of various factors to the flocculation effect are decreased; the application range of the compounding flocculants is enlarged; and the pollution and the toxic action of inorganic salts and organic flocculants to environments are relieved.

Description

technical field [0001] The invention relates to a compound application method of coal biological and non-biological flocculants. Background technique [0002] Coal slime water treatment is an important link in coal preparation plant. Because the slime water concentrates the finest and most difficult particles in the raw coal, these particles are extremely difficult to be treated by conventional sedimentation, recovery and dehydration equipment due to their fine particle size, high ash content, high viscosity, and difficulty in settling. In order to effectively realize the closed-circuit circulation of the slime water, the slime water is treated with flocculants, which can achieve a good treatment effect. [0003] The flocculants used in coal slime water treatment in the prior art mainly include inorganic flocculants represented by aluminum salts, iron salts and their hydrolyzed polymers and organic polymer flocculants represented by polyacrylamide and their derivatives. Be...

Claims

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Application Information

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IPC IPC(8): C02F3/34
Inventor 张东晨闫佳王涛侯志翔周倩倩
Owner ANHUI UNIV OF SCI & TECH
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