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A method for improving the filtration performance of coal slime water floc by compound bacterial strain coal bioflocculant
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A technology of biological flocculants and compound strains, applied in biological water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc. Effect
Active Publication Date: 2018-11-27
ANHUI UNIV OF SCI & TECH
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Although these two types of filter aids have good filter aid effects, they all have obvious defects.
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example 1
[0047] Example 1 Coal slime water natural sedimentation filtration performance
[0048] 1) Take 500mL of 40g / L coal slime water, adjust the pH value of the coal slime water to 7.0 with a pen-type pH meter, and then stir slowly with a magnetic stirrer for 5 minutes;
[0049] 2) Stop stirring, and after the coal slime water settles naturally for 30 minutes, pour off the supernatant, and take 200 mL of coal slime water natural sediment for Buchner funnel filtration test;
[0050] Calculated from the measured data, the filter specific resistance of coal slime water natural sediment is 5.7119×10 10 cm / g.
example 2
[0051] Coal slime water floc filtration performance one of example 2 adding coal biological flocculant Bacillus subtilis
[0052] 1) Take 450mL of coal slime water with a concentration of 40g / L, stir well and add coagulant, that is, CaCl with a mass fraction of 2% 2 Aqueous solution 9mL, stir slowly with a magnetic stirrer for 1min;
[0053] 2) After stirring evenly, add 9mL of the coal bioflocculant Bacillus subtilis bacteria liquid to the coal slime water, add more coal slime water to 500mL, adjust the pH value of the coal slime water to 7.0 with a pen-type pH meter, and then use a magnetic stirrer to slowly Stir at high speed for 5 minutes;
[0054] 3) Stop stirring, and after the coal slime water flocculates and settles for 30 minutes, pour off the supernatant, and take 200mL coal slime water flocs for Buchner funnel filtration test;
[0055] Calculated from the measured data, the filtration specific resistance of the slime water floc is 8.4470×10 9 cm / g.
example 3
[0056] Coal slime water floc filtration performance two of example 3 adding coal biological flocculant Bacillus subtilis
[0057] 1) Take 450mL of coal slime water with a concentration of 40g / L, stir well and add coagulant, that is, CaCl with a mass fraction of 2% 2 Aqueous solution 9mL, stir slowly with a magnetic stirrer for 1min;
[0058]2) After stirring evenly, add 12mL of the coal bioflocculant Bacillus subtilis bacteria liquid to the coal slime water, add the coal slime water to 500mL, adjust the pH value of the coal slime water to 7.0 with a pen-type pH meter, and then use a magnetic stirrer to slowly Stir at high speed for 5 minutes;
[0059] 3) Stop stirring, and after the coal slime water flocculates and settles for 30 minutes, pour off the supernatant, and take 200mL coal slime water flocs for Buchner funnel filtration test;
[0060] Calculated from the measured data, the filtration specific resistance of the slime water floc is 3.3641×10 9 cm / g.
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Abstract
The invention relates to a method for improving the filtering quality of coal slime water flocs by utilizing a composite strain coal microbial flocculant. The method comprises the following steps: under a certain coal slime water concentration condition, adding a CaCl2 aqueous solution with the mass fraction of 2% to serve as a coagulant aid, further adding the composite strain coal microbial flocculant, regulating the pH and other conditions of coal slime water, so as to improve the filtering quality of coal slime water flocs through the composite action of the coal microbial flocculant, wherein the composite strain coal microbial flocculant comprises two original culture solutions, namely bacillus subtilis liquid and white-rot fungus liquid, the volume ratio of the bacillus subtilis liquid to the white-rot fungus liquid is 1:X, and the composite strain coal microbial flocculant can obtained after 2-4 day's enrichment culture at the constant temperature of 30 DEG C and the rotating speed of 160 rpm. According to the method, after coal slime water is subjected to the treatment in the method, the specific filtration resistance of flocs is obviously decreased, the filtering quality is effectively improved; besides, the composite strain coal microbial flocculant used by the method is safe, harmless and free of secondary pollution, has biological degradability, does not influence other production chains of coal preparation, not only improves the filtering effect of coal slime water, but also has an important practical significance to environmental protection.
Description
technical field [0001] The invention relates to a method for improving the filtration performance of coal slime water floc by a composite bacterial strain coal biological flocculant. Background technique [0002] Coal washing and processing produces a large amount of slime water. Coal slime water contains a certain amount of coal slime and silt, and the direct discharge not only causes serious environmental pollution, but also causes waste of water and coal resources. Therefore, the treatment of coal slime water has become an important link in the coal preparation process. The ultimate goal of slime water treatment is to realize the closed loop of washing water in the coal preparation plant and the recovery in the slime plant. The key link to achieve this goal is the effective separation of solid and liquid. Coal slime filtration and dehydration is an important means of solid-liquid separation, and its effect depends on the filtration performance of coal slime water. [...
Claims
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Application Information
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