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Composite flocculant for treating low-temperature and low-turbidity water and preparation method thereof

A technology of low-temperature and low-turbidity water and flocculant, which is applied in chemical instruments and methods, special compound water treatment, biological water/sewage treatment, etc. It can achieve excellent flocculation effect, improve biosafety, and reduce aluminum residues

Active Publication Date: 2015-05-06
北京长兴泰华科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the 5-6 months of ice-covered period in the northern region every year, the water quality is in a low-temperature and low-turbidity state for a long time. Since the concentration of particles in the low-turbidity water is very low, the probability of particle collisions during the entire coagulation process is very limited; and Low temperature leads to incomplete hydrolysis of coagulation reaction, which brings great difficulties to drinking water treatment
At present, coagulation and sedimentation technology is more common in the treatment of low-temperature and low-turbidity water, and aluminum salts are widely used as traditional conventional flocculants, which have problems such as large dosage, high treatment costs, and large residual aluminum salts.

Method used

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Effect test

preparation example Construction

[0022] Wherein the preparation method of composite biological flocculant dry powder is as follows:

[0023] One of the raw materials used in the biological flocculant of the present invention is a composite biological flocculant produced by fermentation of Agrobacterium tumefaciens and Bacillus sphaeicus; the active ingredient of the biological flocculant is a polysaccharide substance, which has Good thermal stability, containing carboxyl groups respectively to COO - Exists in the form of COOH and its active ingredient molecular weight is 4.79×10 5 Da.

[0024] The preparation method of biological flocculant of the present invention is carried out as follows: 1. prepare liquid fermentation medium: liquid fermentation medium is made of glucose, dipotassium hydrogen phosphate, potassium dihydrogen phosphate, magnesium sulfate heptahydrate, sodium chloride, urea, yeast extract and water, and adjust the pH value of the liquid fermentation medium to 7.5, in which glucose 10g / L, K...

Embodiment 1

[0037] Get 1000mL of Songhua River Harbin section water, pH is 6.3, temperature is 0.5 ℃, turbidity is 12.32NTU, Al 3+ The concentration is 0.3649mg / L, the total number of colonies is 550CFU / mL, and it is placed in a glass container. Add bioflocculant dry powder (mass fraction 3.23%) and polyaluminum ferric chloride (mass fraction 32.26%) into 1L of distilled water, mix well, heat and ultrasonically vibrate, add calcium hydroxide (mass fraction 64.52%), and stir properly Make a composite flocculant liquid, take 1ml of the prepared composite flocculant and add it to the above 1000mL water sample, stir rapidly (200r / min) for 30s, and then stir slowly (60r / min) for 2min, after standing for 20min, extract the distance liquid The supernatant at 2cm from the surface was measured, and the processing results were as follows: turbidity 2.35NTU, turbidity removal rate 80.93%, Al 3+ The concentration is 0.1233mg / L, the aluminum ion removal rate is 66.21%, and the total number of colonie...

Embodiment 2

[0039] Take 1000mL of source water from Daqing Longhupao Reservoir, pH is 6.5, temperature is 3.2°C, turbidity is 4.11NTU, Al 3+ The concentration is 0.4775mg / L, the total number of colonies is 670CFU / mL, and it is placed in a glass container. Add bioflocculant dry powder (mass fraction 2.78%) and polyaluminum ferric chloride (mass fraction 27.78%) into 1L of distilled water, mix well, heat and ultrasonically vibrate, add calcium hydroxide (mass fraction 69.44%), and stir properly Make a composite flocculant liquid, take 1ml of the prepared composite flocculant and add it to the above 1000mL water sample, stir rapidly (200r / min) for 30s, and then stir slowly (60r / min) for 2min, after standing for 20min, extract the distance liquid Surface 2cm place supernatant is measured, and processing result is as follows: turbidity 1.26NTU, turbidity removal rate 69.34%, Al 3+ The concentration is 0.1987mg / L, the aluminum ion removal rate is 58.39%, and the total number of colonies is 25C...

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Abstract

The invention provides a composite flocculant for treating low-temperature and low-turbidity water. The composite flocculant consists of the following components in percentage by mass: 1.10-7.89 percent of biological flocculant dry powder, 15.87-60.61 percent of polyaluminum ferric chloride and 36.76-81.97 percent of calcium hydroxide. The flocculant provided by the invention is good in product stability, stable in reaction conditions and easy in control, is stabilized for at least more than 12 mouths and is suitable for industrial production and practical water plant application. The flocculant provided by the invention has the characteristics of good product stability, less consumption, reduced cost, good flocculation effect, high treatment efficiency, small sludge output and the like and can be widely suitable for the field of feed water treatment and other water treatment fields.

Description

technical field [0001] The invention belongs to the technical field of water treatment agents, and in particular relates to a composite flocculant for treating low-temperature and low-turbidity water and a preparation method thereof. Background technique [0002] In the past 20 years, while my country's economy has developed rapidly and living standards have improved significantly, environmental problems such as water shortages and water pollution have often occurred in many areas, especially in the north. During the 5-6 months of ice-covered period in the northern region every year, the water quality is in a low-temperature and low-turbidity state for a long time. Since the concentration of particles in the low-turbidity water is very low, the probability of particle collisions during the entire coagulation process is very limited; and Low temperature leads to incomplete hydrolysis of coagulation reaction, which brings great difficulties to drinking water treatment. At pre...

Claims

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Application Information

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IPC IPC(8): C02F3/34
CPCC02F3/34C02F2305/06
Inventor 马放李立欣杨基先李昂吴丹魏薇
Owner 北京长兴泰华科技发展有限公司
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