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A method for efficiently removing methylene blue from waste gas produced by straw pretreatment

A straw pretreatment, methylene blue technology, applied in water/sewage treatment, chemical instruments and methods, textile industry wastewater treatment, etc., can solve the problems of high cost and low value, and achieve excellent removal effect.

Active Publication Date: 2020-05-26
SICHUAN AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing technology has achieved a certain degree of "treating waste with waste", by modifying some industrial and agricultural production wastes, it is possible to obtain products that remove dyes, but the cost of these modification treatments is usually high, and promotion low value applied

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Wheat straw was crushed through a 40-mesh sieve to obtain straw powder; 8g of wheat straw powder was put into the reactor, and 80g of phosphoric acid and hydrogen peroxide mixed solution was added to the reactor at a solid-to-liquid ratio of 1:10. The mass fraction of phosphoric acid is 65.0%, the mass fraction of hydrogen peroxide is 7.0%, the pretreatment temperature is 50 ℃, and the pretreatment time is 4h; The degradation reaction was carried out at 50° C. in an airtight container (50 ml size) in ml methylene blue waste solution (100 ppm).

[0032] Based on the change of reaction concentration before and after, the removal rate of methylene blue was measured, and the obtained removal rate was 99.2%.

Embodiment 2

[0034] Adjust the mass fraction of concentrated phosphoric acid to be 70.0%, the mass fraction of hydrogen peroxide to be 5.0%, and the rest remain consistent with Example 1. The removal rate of methylene blue still all reaches more than 99%.

Embodiment 3

[0036] Adjust the weight of the wheat straw powder to 10 g, the volume of the methylene blue waste liquid to 5 ml, and keep the rest consistent with Example 1. The removal rate of methylene blue still all reaches more than 99%.

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PUM

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Abstract

The invention provides a method for efficiently removing methylene blue by utilizing waste gases generated by straw pretreatment. The method comprises the following steps: collecting the waste gases generated by the straw pretreatment, introducing the collected waste gases into a closed container filled with a methylene blue waste liquid, and performing a degradation reaction at the temperature of30-80 DEG C, wherein the straw pretreatment method comprises the following steps: putting straw into a reaction kettle, adding a concentrated phosphoric acid-hydrogen peroxide mixed reagent, and performing a pretreatment reaction, wherein a mass fraction of concentrated phosphoric acid is 60.0-70.0%, and a mass fraction of hydrogen peroxide is 5.0-8.0%. The method provided by the invention has anexcellent removing effect on the common methylene blue, avoids the disadvantages that current solid-base and liquid-based treatment technologies need special modification treatment of raw materials,realizes the technical purpose of ''treating waste directly by using waste'' in a true sense, and realizes an organic combination of two industries of bioethanol preparation and wastewater treatment.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a method for efficiently removing methylene blue from waste gas produced by straw pretreatment. Background technique [0002] my country is a traditional textile country. In recent years, with the request for economic structural transformation, the improvement of textile production waste treatment technology will receive more and more attention. Dyestuff is one of the main pollutants in the textile production process. Its composition is complex, and most of them are biologically toxic and refractory. It is a kind of wastewater that is difficult to treat. [0003] At present, the traditional methods of pollution treatment are adsorption, membrane separation, ozone oxidation and photocatalysis. [0004] The Chinese patent with the authorized notification number CN 102659235 B provides a treatment method for dye wastewater. Through the method of heterogeneo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/58C02F101/30C02F103/30
CPCC02F1/58C02F2101/308C02F2103/30
Inventor 沈飞田东向春晓刘章林王卿吴孟珂刘太聪曾咏梅杨刚邓仕槐张延宗
Owner SICHUAN AGRI UNIV