Biochar/polyvinyl formal porous composite filler, and preparation method and application thereof

A polyvinyl formal and composite filler technology, applied in chemical instruments and methods, water pollutants, water/sludge/sewage treatment, etc., can solve the problems of difficult film hanging, easy detachment of biofilm, and reduction of specific surface area. , to achieve the effect of favorable for mass transfer of pollutants and dissolved oxygen, uniform distribution of pore structure, and improvement of treatment efficiency

Inactive Publication Date: 2019-05-10
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cost of fixed packing is high, and the requirements for the uniformity of water distribution and air distribution are very high, and it is easy to cause difficulty in removing the film, which will cause clogging. Once clogged, its treatment efficiency will drop sharply, and even damage the structure.
During the operation of the hanging packing, the packing wires will clump together, which greatly reduces the actual specific surface area used, and is prone to broken wires and central rope breaks, which affects the service life. The service life is generally 1-2 years
The specific gravity of the suspended filler is close to that of water, the volume of the monomer is small, and there is no need for a fi

Method used

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  • Biochar/polyvinyl formal porous composite filler, and preparation method and application thereof
  • Biochar/polyvinyl formal porous composite filler, and preparation method and application thereof
  • Biochar/polyvinyl formal porous composite filler, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] a. Weigh 20g of polyvinyl alcohol particles into the reaction kettle, add 170g of distilled water, heat in a constant temperature water bath, set the temperature at 95°C and mechanically stir within the range of 300r / min for 1.5h until the polyvinyl alcohol particles are all Dissolved to obtain a clear aqueous solution of polyvinyl alcohol.

[0037] b. Cool the polyvinyl alcohol aqueous solution obtained in a to 45° C. and keep the temperature constant. Increase the mechanical stirring speed to 550r / min, add 1.5g of calcium carbonate solid powder, 0.5g of sodium lauryl sulfate, and 10g of biochar powder while stirring, and continue stirring for 10 minutes to fully dissolve the sodium lauryl sulfate, carbonic acid Calcium and biochar powder are uniformly dispersed in polyvinyl alcohol aqueous solution.

[0038] c. Keep the mechanical stirring speed at 550r / min, fully mix 25g of sulfuric acid solution and 20g of formaldehyde solution, then slowly add to the reaction kett...

Embodiment 2

[0043] a. Weigh 20g of polyvinyl alcohol particles into the reaction kettle, add 160g of distilled water, heat in a constant temperature water bath, set the temperature at 95°C, and mechanically stir for 1 hour at a speed of 300r / min until the polyvinyl alcohol particles are all Dissolved to obtain a clear aqueous solution of polyvinyl alcohol.

[0044] b. Cool the polyvinyl alcohol aqueous solution obtained in a to 40° C. and keep the temperature constant. Increase the mechanical stirring speed to 500r / min, add calcium carbonate solid powder 1g, sodium lauryl sulfate 1g, biochar powder 12g under stirring state, keep stirring for 10min to fully dissolve sodium lauryl sulfate, calcium carbonate and The biochar powder was uniformly dispersed in the polyvinyl alcohol aqueous solution.

[0045] c. Keep the mechanical stirring speed at 500r / min, fully mix 30g of sulfuric acid solution and 25g of formaldehyde solution, then slowly add to the reaction kettle, the volume of the foami...

Embodiment 3

[0050] a. Weigh 20g of polyvinyl alcohol particles into the reaction kettle, add 160g of distilled water, heat with a constant temperature water bath, set the temperature at 95°C, and mechanically stir for 2 hours at a speed of 300r / min until the polyvinyl alcohol particles are all Dissolved to obtain a clear aqueous solution of polyvinyl alcohol.

[0051] b. Cool the polyvinyl alcohol aqueous solution obtained in a to 50° C. and keep the temperature constant. Increase the mechanical stirring speed to 600r / min, add 2g of calcium carbonate solid powder, 0.5g of sodium lauryl sulfate, and 4g of biochar powder under stirring, and continue stirring for 10 minutes to fully dissolve the sodium lauryl sulfate and calcium carbonate and biochar powder are uniformly dispersed in polyvinyl alcohol aqueous solution.

[0052] c. Keep the mechanical stirring speed at 600r / min, fully mix 20g of sulfuric acid solution and 18g of formaldehyde solution, then slowly add to the reaction kettle, ...

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Abstract

The invention provides a biochar/polyvinyl formal porous composite filler, and a preparation method and application thereof. The biochar/polyvinyl formal porous composite filler has the advantages that foamed mixed liquid is obtained by adding foaming agents, surfactants, biochar powder, a formaldehyde solution and a sulfuric acid solution into an aqueous solution of polyvinyl alcohol and continuously stirring the aqueous solution, the biochar/polyvinyl formal porous composite filler is obtained through in-situ synthesis based on aldolization reaction after heating, and the composite filler prepared by the process has a coarse surface, a large specific area, high hydrophilic and biological affinity, and the advantages that traditional fillers can't match in water treatment application.

Description

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Claims

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Application Information

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Owner ZHEJIANG UNIV OF TECH
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