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Preparation method of kieselguhr composite adsorbent

A composite adsorption and diatomite technology, applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, can solve the problem of small adsorption capacity of inorganic adsorbents, high treatment costs, and reduction of chroma and COD of printing and dyeing wastewater Value and other issues, to achieve the effect of low cost and simple production process

Inactive Publication Date: 2012-07-04
JILIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Coagulation adsorption method: This type of method can effectively reduce the chroma and COD value of printing and dyeing wastewater by adding adsorbents, flocculants or the combination of the two, such as the technical solutions disclosed in CN00135440, CN200610014582, CN200910181636, CN 201010133110, etc. In this type of method, the adsorption capacity of inorganic adsorbent is small, and the amount of sludge produced is large, which is not conducive to subsequent treatment. At the same time, the introduction of polyacrylamide organic flocculants may cause secondary pollution.
[0004] Electrolytic oxidation method: This type of method achieves the decolorization effect by means of electrolysis, adding strong oxidants or joint action, such as the technical solutions disclosed in CN200810062521, CN200910037693, CN201010102670, etc. This type of method has no effect on the removal of difficult-to-oxidize pollutants. Hypochlorous acid oxidants can cause secondary pollution
[0005] Biodegradation method: This type of method absorbs and degrades the dyes in the printing and dyeing wastewater by introducing microorganisms, such as the technical solutions disclosed in CN201010266843, CN201010582290, etc. The treatment process of this type of method is relatively complicated, and the treatment cost is relatively high

Method used

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preparation example Construction

[0021] A preparation method of diatomite composite adsorbent, comprising the following steps and sequence:

[0022] a, diatomite is pulverized to 200 mesh;

[0023] b. The diatoms crushed to 200 mesh are modified by flash firing in a flash firing kiln, the flash firing time is 5-20 seconds, and the flash firing temperature is 400-800°C;

[0024] c, adding 0.1-5wt% foaming agent to the modified diatomite by weight percentage;

[0025] d, after mixing uniformly in a high-speed mixer, add 0.05-0.2L chitosan solution in the mixture of every kilogram of modified diatomaceous earth and foaming agent;

[0026] E, carry out granulation with granulator, particle diameter is 0.5-5mm;

[0027] f. The obtained granulation is heated and foamed in an oven, the heating time is 30min-4h, and the heating temperature is 50-150°C to prepare the diatomite composite adsorbent.

[0028] The foaming agent is one or both of sodium bicarbonate or azodicarbonamide powdery low-temperature foaming age...

Embodiment 1

[0031] Take 100kg of diatomite and flash burn it at 400°C for 20 seconds, add 5 wt% of diatomite weight of sodium bicarbonate, stir and mix evenly in a high-speed mixer. Chitosan is dissolved in the acetic acid solution of 1wt% to make concentration be the chitosan solution of 0.02kg / L, add 5L chitosan solution in the mixture of diatomaceous earth and sodium bicarbonate and carry out granulation, obtain For particles with a particle size of 0.5-2mm, heat and foam the prepared particles in an oven at a temperature of 150° C. for 30 minutes to obtain a finished diatomite composite adsorbent.

Embodiment 2

[0033] Take 200kg of diatomite and flash burn it at 800°C for 5 seconds, add 1 wt% of diatomite weight of sodium bicarbonate, stir and mix evenly in a high-speed mixer. Chitosan is dissolved in the acetic acid solution of 2wt% to make concentration be the chitosan solution of 0.1kg / L, add 20L chitosan solution in the mixture of diatomaceous earth and sodium bicarbonate and carry out granulation, make For particles with a particle size of 1-5 mm, heat and foam the prepared particles in an oven at a temperature of 50° C. for 4 hours to obtain a finished diatomite composite adsorbent.

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Abstract

The invention relates to a preparation method of a kieselguhr composite adsorbent. The method comprises the following steps of: crushing kieselguhr, modifying the kieselguhr through flash burning in a flash-burning kiln, and adding a foaming agent into the modified foaming agent; mixing in a high-speed mixer and adding chitosan solution; granulating with a granulator; and heating and foaming the obtained granules in an oven to obtain the finished product. In the invention, a flash-burning method is adopted for activation and modification, the sintering is uniform, the time of the flash-burning method is short, and the production efficiency is high. Chitosan has a very good chelation effect on heavy metal ions; the adsorption specific surface area is increased after foaming; since the particle sizes of the granulation are different, the densities of the finished products are different such that some of the adsorbents float on the water surface, and some are dispersed in water, and a great quantity of dye, ammonia nitrogen, surfactant and the like in the dyeing and finishing waste water can be adsorbed; and a large flocculation is formed after the adsorption, being favorable for post-processing. The kieselguhr is rich in resources and cheap; and as a low-temperature foaming agent is adopted, the foaming energy consumption and the cost of the adsorbent are low. The kieselguhr composite adsorbent is non-toxic and harmless, secondary pollution is prevented, the production technology is simple, and the cost is relatively low.

Description

technical field [0001] The invention relates to a preparation method of a printing and dyeing industry wastewater treatment agent, in particular to a preparation method of a diatomite-chitosan composite water treatment agent. Background technique [0002] Printing and dyeing wastewater is wastewater discharged from printing and dyeing processing plants during the processing of cotton, hemp, chemical fibers and their blended products. Printing and dyeing wastewater has the characteristics of high chroma, high concentration of organic pollutants, complex components, and difficult biochemical degradation. The usual processing methods are: [0003] Coagulation adsorption method: This type of method can effectively reduce the chroma and COD value of printing and dyeing wastewater by adding adsorbents, flocculants or the combination of the two, such as the technical solutions disclosed in CN00135440, CN200610014582, CN200910181636, CN 201010133110, etc. In this type of method, th...

Claims

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Application Information

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IPC IPC(8): B01J20/24C02F1/28C02F1/58
Inventor 李予晋周燕王铁夫张延洁曾路彭小芹
Owner JILIN UNIV
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