A method for treating refined cotton black liquor by using residual alkali and residual heat

A technology of waste heat treatment and refined cotton, which is applied in the fields of water treatment parameter control, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of high cost, difficult application, complicated treatment technology and process, and achieve the effect of efficient removal

Active Publication Date: 2021-11-02
DALIAN NATIONALITIES UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these processing techniques are complex and costly, and are difficult to be applied in actual engineering.
[0004] According to the survey and calculation of the wastewater treatment cost of the existing refined cotton processing enterprises, it is found that although black liquor only accounts for 32% of the total amount of refined cotton wastewater, the treatment cost of black liquor accounts for more than 2 / 3 of the entire refined cotton wastewater treatment cost

Method used

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  • A method for treating refined cotton black liquor by using residual alkali and residual heat
  • A method for treating refined cotton black liquor by using residual alkali and residual heat
  • A method for treating refined cotton black liquor by using residual alkali and residual heat

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) During the treatment process of the refined cotton black liquor, the refined cotton black liquor is first adjusted to the optimum temperature and alkalinity in the adjustment tank 1. The cotton black liquor flows into the reciprocating partition reaction tank 2 through the pump or the liquid level difference.

[0038] (2) Temperature sensor B 9 and pH sensor B 10 transmit the temperature and pH data of processing refined cotton black liquor in the partition reaction tank 2 to the controller 7, and the controller 7 can adjust the dropper 8 according to the actual temperature and pH The velocity of flow, of which every 1m 3 Add 40L ~ 60L, 2mmol / L ~ 4mmol / L PS or PMS solution to the refined cotton black liquor, and the PS or PMS solution added dropwise to the partition reaction tank 2 is quickly activated by the waste heat and alkali in the refined cotton black liquor Strong oxidizing SO 4 － · and HO ·, when the refined cotton black liquor reciprocates in the partit...

Embodiment 2

[0042] In order to further optimize the conditions of the refined cotton black liquor, this example examines the best treatment plan from the three aspects of concentration, temperature and pH. In the present embodiment-take potassium persulfate as an example.

[0043] (1) Effect of potassium persulfate concentration on COD removal effect

[0044] Firstly, at room temperature of 20°C and pH=7.0, adding 50ml of 0.5mmol / L, 1.0mmol / L, 1.5mmol / L, 2.0mmol / L, 2.5mmol / L and 3.0mmol respectively to 1L of refined cotton black liquor / L total of 6 concentration gradient potassium persulfate solutions to analyze the change of COD removal effect in refined cotton black liquor (attached figure 1 ). With the increase of the concentration of potassium persulfate, the removal rate of COD in the refined cotton black liquor also increased obviously sequentially. It can be found that when 3.0mmol / L potassium persulfate is added for 250min, the removal rate of COD in the refined cotton black l...

Embodiment 3

[0054] In this embodiment, in this embodiment, potassium peroxymonosulfate is used as an example to investigate the best treatment plan from three aspects of concentration, temperature and pH.

[0055] (1) Effect of potassium peroxymonosulfate concentration on COD removal effect

[0056] Firstly, at room temperature of 20°C and pH=7.0, adding 50ml of 0.5mmol / L, 1.0mmol / L, 1.5mmol / L, 2.0mmol / L, 2.5mmol / L and 3.0mmol respectively to 1L of refined cotton black liquor / L, a total of 6 concentration gradient potassium peroxymonosulfate solutions, to analyze the change of COD removal effect in the refined cotton black liquor, as shown in the attached Figure 7 As shown, along with the increase of potassium peroxomonosulfate concentration, the removal rate of COD in the refined cotton black liquor also obviously increases successively, can find: when adding 2.5mmol / L potassium peroxymonosulfate 300min, in the refined cotton black liquor The removal rate of COD reached the maximum va...

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Abstract

A method for treating refined cotton black liquor by using residual alkali and residual heat. The invention fully utilizes the residual heat and residual alkali after cooking cotton linters to activate PS / PMS to produce SO with strong oxidation activity. 4 － · and HO · can efficiently and quickly oxidize and decompose macromolecular organic pollutants in black liquor. The refined cotton black liquor is first adjusted in temperature and pH and then added with PS / PMS solution. The PS / PMS in the reaction tank is quickly activated by the waste heat and alkali in the refined cotton black liquor to produce strong oxidizing SO 4 － ·and HO·, under the agitation of the refined cotton black liquor in the reaction tank, the SO 4 － · and HO · can fully react with the macromolecular refractory organic matter in the refined cotton black liquor, so that the macromolecular organic pollutants are decomposed into small molecular organic matter, carbon dioxide and water, and the efficient removal of organic pollutants is realized.

Description

technical field [0001] The invention relates to the field of refined cotton wastewater treatment, in particular to a method for treating refined cotton black liquor by using residual alkali and residual heat. Background technique [0002] Refined cotton (cotton pulp) is a high-purity cellulose product made of cotton linters as raw material and refined by high-temperature cooking with alkali. It is widely used in the manufacture of cellulose esters, nitrocellulose (nitrocellulose) and cellulose acetate. It is widely used in food, medicine, daily chemicals, plastics, electronics, papermaking, metallurgy, aerospace and many other fields. It is known as "special industrial monosodium glutamate" and has a good market prospect. my country is a big country in the production and use of refined cotton. According to statistics, the total demand for refined cotton by domestic and foreign enterprises is about 300,000 tons. The total demand for refined cotton by foreign enterprises is ab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/72C02F101/30
CPCC02F1/722C02F2101/30C02F2209/02C02F2209/06C02F2209/08C02F2305/023
Inventor 冉春秋周刚杨宇轩杨雨婷马可欣邢逸航马礼佳
Owner DALIAN NATIONALITIES UNIVERSITY
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