Method for preparing modified composite biological filler

A biological filler and modification technology, applied in chemical instruments and methods, biological water/sewage treatment, fuel, etc., can solve the problems of uneven air distribution and water distribution, small specific surface area, shortening the film hanging time, etc. Good membrane properties and mechanical properties, simple production process, and the effect of avoiding secondary pollution

Inactive Publication Date: 2017-06-20
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention: the currently used biological fillers have poor stability, poor microbial film-hanging performance, small specific surface area, smooth surface, and easy biofilm falling off, which often leads to blockage, agglomeration, and gas distribution during use. The defect of uneven water distribution and poor oxygenation performance provides a method for modifying composite biological fillers. The invention uses polyvinyl chloride multifaceted hollow spheres as carriers, and then grafts acrylic acid to modify them after oxidation by composite acids. Oxygen polar groups can improve the surface roughness, increase the specific surface area and the attachment area of ​​microorganisms, and improve the film-hanging performance of microorganisms. Combined with the adsorption and removal capabilities of zeolite, vermiculite and activated carbon

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] Take 10 polyvinyl chloride multifaceted hollow spheres with a specification of Φ25mm and put them into an ultrasonic cleaner, wash the multifaceted hollow spheres twice with acetone, absolute ethanol, and deionized water in sequence, and add 200mL of mixed acid solution after natural air drying, at 40 ℃ in a constant temperature water bath, react at 300r / min for 4 hours to obtain a mixed solution; filter the above mixed solution, and wash the filter residue with deionized water until the washing solution is neutral to obtain a pretreated polyvinyl chloride multi-faceted hollow sphere, and then pretreated polyvinyl chloride Add polyvinyl chloride multi-faceted hollow spheres into 300 mL of acrylic acid solution with a mass fraction of 35%, ultrasonically treat with 400W ultrasonic wave for 1 hour, then filter, and wash the filter residue with deionized water for 3 times to obtain modified polyvinyl chloride multi-faced hollow spheres, which are set aside; weigh 300g The l...

example 2

[0021] Take 20 polyvinyl chloride multifaceted hollow spheres with a specification of Φ25 mm and put them into an ultrasonic cleaner, wash the multifaceted hollow spheres twice with acetone, absolute ethanol, and deionized water in sequence, and add them to 300 mL of mixed acid solution after natural air drying. ℃ in a constant temperature water bath, react at 400r / min for 6 hours to obtain a mixed solution; filter the above mixed solution, and wash the filter residue with deionized water until the washing solution is neutral to obtain a pretreated polyvinyl chloride multi-faceted hollow sphere, and then pretreated polyvinyl chloride Add polyvinyl chloride multi-faceted hollow spheres into 500 mL of acrylic acid solution with a mass fraction of 40%, sonicate with 400W ultrasonic wave for 2 hours, then filter, and wash the filter residue with deionized water for 5 times to obtain modified polyvinyl chloride multi-faceted hollow spheres for later use; weigh 500g The loofah is add...

example 3

[0024] Take 15 polyvinyl chloride multifaceted hollow spheres with a specification of Φ25 mm and put them into an ultrasonic cleaner, wash the multifaceted hollow spheres with acetone, absolute ethanol, and deionized water for 3 times in sequence, and add 250 mL of mixed acid solution after natural air-drying. ℃ in a constant temperature water bath, react at 350r / min for 5 hours to obtain a mixed solution; filter the above mixed solution, and wash the filter residue with deionized water until the washing solution is neutral to obtain a pretreated polyvinyl chloride multi-faceted hollow sphere, and then pretreated polyvinyl chloride Add polyvinyl chloride multi-faceted hollow spheres into 400mL of acrylic acid solution with a mass fraction of 38%, ultrasonically treat with 400W ultrasonic wave for 1.5h, then filter, wash the filter residue with deionized water 4 times to obtain modified polyvinyl chloride multi-faceted hollow spheres, set aside; weigh Put 400g of loofah into a p...

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Abstract

The invention discloses a method for preparing a modified composite biological filler and belongs to the technical field of environmental protection. According to the method, polyvinyl chloride polyhedral hollow spheres serve as a carrier, are subjected to compound-acid oxidation and then are subjected to acrylic acid grafting modification; through introducing oxo polar groups, the surface roughness and microbial film hanging performance are improved, the specific surface area and microbial attachment area are increased; due to adsorption removal capability of zeolite, vermiculite and activated charcoal to wastewater, luffa cylindrica is subjected to carbonizing treatment and then is compounded with the zeolite and the vermiculite, and FeAl precipitates are adsorbed; FeAl oxide doped composite powder is prepared through high-temperature calcination, so as to further improve the adsorption removal capability; meanwhile, due to biological film growth promoting action of Fe, the film hanging time is shortened; and finally, the composite powder is stuck to surfaces of the modified polyvinyl chloride polyhedral hollow spheres treated with polyvinyl alcohol, so as to prepare the modified composite biological filler. The prepared modified composite biological filler has the advantages that the stability is good, the specific surface area is large, the surface is rough, and biological films are difficult in falling-off.

Description

technical field [0001] The invention discloses a preparation method of a modified composite biological filler, which belongs to the technical field of environmental protection. Background technique [0002] In the field of wastewater treatment, due to cost advantages, microorganisms are often used to treat wastewater from various sources, such as urban domestic wastewater, industrial wastewater, and wastewater produced by coal gasification processes. In the process of treating wastewater with microorganisms, fillers are often used as carriers for the reproduction and growth of microorganisms. Microorganisms grow in large numbers and form a film-like biological community on the filler, forming a food chain that can effectively remove organic pollutants in water. This kind of filler is called biological filler. [0003] There are many types of biological fillers, such as shaped fixed fillers, suspended fillers, suspended fillers and combined fillers. This type of filler is g...

Claims

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Application Information

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IPC IPC(8): C10L3/10C10L3/00C02F3/34
CPCC02F3/00C02F3/105C02F3/34
Inventor 董燕敏杨阳李雪晴王艳芹
Owner CHANGZHOU UNIV
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