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Nano magnetic cationic flocculant and preparation method thereof

A cationic flocculant and nano-magnetic technology, which is applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of long mud-water separation process, increased floor area, large sedimentation tank volume, etc., to speed up the settling speed and shorten the existence time , The effect of simple and easy-to-obtain raw materials

Pending Publication Date: 2019-08-20
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In actual use, the system flocculant has a limited removal rate of suspended particles and other pollutants in the water, and the follow-up mud-water separation process is longer, so that a larger sedimentation tank volume is required, resulting in an increase in the initial investment cost and floor space. increase, it is necessary to improve the method of flocculant conditioning sludge

Method used

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  • Nano magnetic cationic flocculant and preparation method thereof
  • Nano magnetic cationic flocculant and preparation method thereof
  • Nano magnetic cationic flocculant and preparation method thereof

Examples

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Embodiment 1

[0045] This embodiment provides a nano-magnetic cationic flocculant, and its specific preparation steps are as follows:

[0046] Step 1: Graft Copolymerization and Fe Loading 3 o 4 Nanoparticles:

[0047] Weigh 5g of corn starch and 50mL of deionized water, gelatinize at a constant temperature of 70°C for 1 hour in a sealed state to obtain gelatinized starch, use an iron sheet as an anode and a carbon rod as a cathode, connect a DC power supply to build an electrolytic cell, add the gelatinized starch In the electrolytic cell, adjust the temperature of the reaction system to 60°C, dissolve 0.15g of cerium ammonium nitrate and 0.3g of potassium persulfate in 10mL of deionized water and add them to the reaction system as an initiating system, stir at 300r / min for 10min, and turn on the power At the same time, slowly add 20mL of 0.5g / mL acrylamide aqueous solution (the mass ratio of starch to acrylamide is 1:2), adjust the reaction system to 30°C, add NaOH solution dropwise to ...

Embodiment 2

[0054] This embodiment provides a nano-magnetic cationic flocculant, and its specific preparation steps are as follows:

[0055] Step 1: Graft Copolymerization and Fe Loading 3 o 4 Nanoparticles:

[0056] Weigh 5g of corn starch and 50mL of deionized water, gelatinize at a constant temperature of 70°C for 1 hour in a sealed state to obtain gelatinized starch, use an iron sheet as an anode and a carbon rod as a cathode, connect a DC power supply to build an electrolytic cell, add the gelatinized starch Into the electrolytic cell, adjust the temperature of the reaction system to 60°C, dissolve 0.15g of cerium ammonium nitrate and 0.3g of potassium persulfate in 10mL of deionized water and add them to the reaction system as an initiating system, stir for 10min, turn on the power and slowly add 20mL 0.5g / mL acrylamide aqueous solution (mass ratio of starch to acrylamide is 1:2), adjust the reaction system to 30°C, add NaOH solution dropwise to adjust the pH value to 12, then adj...

Embodiment 3

[0063] This embodiment provides a nano-magnetic cationic flocculant, and its specific preparation steps are as follows:

[0064] Step 1: Graft Copolymerization and Fe Loading 3 o 4 Nanoparticles:

[0065] Weigh 5g of corn starch and 50mL of deionized water, gelatinize at a constant temperature of 70°C for 1 hour in a sealed state to obtain gelatinized starch, use an iron sheet as an anode and a carbon rod as a cathode, connect a DC power supply to build an electrolytic cell, add the gelatinized starch In the electrolytic cell, adjust the temperature of the reaction system to 60°C, dissolve 0.15g of cerium ammonium nitrate and 0.3g of potassium persulfate in 10mL of deionized water and add them to the reaction system as an initiating system, stir at 300r / min for 10min, and turn on the power At the same time, slowly add 20mL of 0.75g / mL acrylamide aqueous solution (the mass ratio of starch to acrylamide is 1:3), adjust the reaction system to 30°C, add NaOH solution dropwise to...

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Abstract

The invention relates to a nano magnetic cationic flocculant and a preparation method thereof, and is applied to the field of sewage and sludge treatment. The nano magnetic cationic flocculant is prepared by the following steps: carrying out graft copolymerization and cationization on gelatinized starch, building an electrolytic tank, carrying out a co-precipitation reaction to generate nano Fe3O4particles, and finally combining the starch graft with the magnetic fluid. The nano magnetic cationic flocculant prepared by the invention has good adsorption and flocculation effects on suspended matter in sewage and sludge, the flocculation sedimentation speed can be accelerated through action of an external magnetic field, and recycling of the flocculating agent in later stage is also facilitated. The nano magnetic flocculant is suitable for treating sewage and sludge of enterprises in papermaking industry, petrochemical industry and the like.

Description

technical field [0001] The invention relates to the technical field of sewage sludge treatment, in particular to a nanometer magnetic cationic flocculant and a preparation method thereof. Background technique [0002] A huge amount of sludge is produced in my country every year, and the moisture content of the undehydrated remaining sludge is as high as 99% to 99.5%. The environment causes secondary pollution. If it is not properly treated and disposed of, it will cause direct or potential harm to the environment. Therefore, how to properly dispose of these sludges is a practical problem in the process of urban development. [0003] Flocculation is a common method of sludge dewatering, mainly by adding chemicals to sludge for dehydration and weight reduction. Commonly used flocculants include polyacrylamide (PAM), polyaluminum chloride (PAC), etc. The addition of flocculants strengthens the structure between sludge particles and facilitates mechanical dehydration. In actua...

Claims

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Application Information

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IPC IPC(8): C02F1/56
CPCC02F1/56
Inventor 谷麟章凯俞海祥乔兴博董光霞许智华
Owner UNIV OF SHANGHAI FOR SCI & TECH
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