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Method for preparing adsorbent by coupling chitosan with bamboo charcoal by using monoaldehyde

A production method and technology of chitosan are applied in the field of preparation of domestic sewage treatment agents, which can solve the problems of products without an adsorbent production method on the market, and achieve the effects of good CODcr and reduction of CODcr.

Inactive Publication Date: 2011-01-26
ZHEJIANG FORESTRY UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] After retrieval and market research, no report was found on the use of monoaldehyde-coupled chitosan and bamboo charcoal as adsorbents in the treatment of domestic sewage, and there is no such report The report of the production method of the adsorbent and the market launch of related products

Method used

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  • Method for preparing adsorbent by coupling chitosan with bamboo charcoal by using monoaldehyde
  • Method for preparing adsorbent by coupling chitosan with bamboo charcoal by using monoaldehyde

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Embodiment 1 (comparison of raw materials and parts by weight thereof for embodiment 1 in Table 1):

[0018] Get 5 parts by weight of chitosan and add in 1250 parts by weight of 5% acetic acid solution, fully stir to make chitosan dissolve completely. Then add 50 parts by weight of bamboo charcoal, fully stir for 5-6 hours, and place for 6-8 hours. Take 1.5 parts of 30% formaldehyde and add water to make 225 parts of 0.2% solution, add the formaldehyde solution dropwise to the acidic mixed solution of bamboo charcoal and chitosan, stir for 7-8 hours, slowly add sodium hydroxide solution to pH=10-11 , continue to stir for 2-3 hours, terminate the coupling reaction, then carry out solid-liquid separation of the reactant, take the solid, add the solid to 150 parts by weight of water for washing, stir for 1 hour, separate the solid and liquid again, and then separate the solid Add to 125 parts of 95% ethanol, stir for 1 hour, filter, and dry the filter cake under vacuum fo...

experiment example

[0024] Under the condition of normal temperature, compare the treatment capacity of this adsorbent, bamboo charcoal and activated sludge on domestic sewage. Add 4g each of the adsorbent, bamboo charcoal and activated sludge to treat 150mL of domestic sewage, add the domestic sewage into a 250mL Erlenmeyer flask, then place the Erlenmeyer flask in a shaker at a speed of 130r / min, vibrate continuously for 24 hours, and let it stand 2h, take the supernatant to measure turbidity, pH, COD cr , Ammonia nitrogen index, the specific experimental data are shown in Table 2.

[0025] Table 2 Comparison table of the results of this adsorbent, bamboo charcoal and activated sludge on domestic sewage

[0026]

[0027] After continuous shaking for 24h, the turbidity is 21NTU, COD cr Under the conditions of 151.7mg / L and ammonia nitrogen concentration of 56.2mg / L, the COD of domestic sewage by this adsorbent cr The removal rate is 41%, which is better than that of bamboo charcoal for dom...

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Abstract

The invention relates to a method for preparing an adsorbent by coupling chitosan with bamboo charcoal by using monoaldehyde. The method comprises the following steps of: preparing acid solution of the chitosan; pre-treating the bamboo charcoal; preparing acid mixed solution of the bamboo charcoal and the chitosan; preparing a coupling reactant of the chitosan and the bamboo charcoal; and preparing a bamboo charcoal adsorbent coupled with the chitosan. The invention relates to a production method of the adsorbent for treating domestic sewage. The adsorbent produced by the method has better effect of reducing CODcr, turbidity and ammonia nitrogen of the domestic sewage than the bamboo charcoal or activated sludge.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a preparation method of a domestic sewage treatment agent. Background technique [0002] Chitosan and coupled chitosan have a good sewage purification ability due to their microscopic porous structure. However, chitosan has the disadvantages of easy loss and large dosage. Bamboo charcoal has developed pores, large specific surface area, strong adsorption capacity, and is relatively cheap, and is more used in sewage treatment. But the adsorption of bamboo charcoal has a saturation. [0003] The invention utilizes the advantages of the two at the same time, and adopts a new method to organically combine the two to obtain a sewage treatment agent with better performance. Taking advantage of the high adsorption capacity of bamboo charcoal, adding a coupling agent to couple chitosan and bamboo charcoal into larger polymers, the acid and water solubility of chitosan after c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/08B01J20/26B01J20/28B01J20/30
Inventor 张文标陈斌金首文
Owner ZHEJIANG FORESTRY UNIVERSITY
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