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Method for improving biodegradability through heterogeneous Fenton oxidation treatment of cotton pulp black liquor

A Fenton oxidation and biochemical technology, applied in the fields of oxidized water/sewage treatment, chemical instruments and methods, water/sewage treatment, etc., can solve the problems of application limitation, low utilization rate, large amount of sludge, etc. cost, improve biodegradability, and solve the effect of environmental pollution problems

Inactive Publication Date: 2018-05-04
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because the acidification of lignin consumes a large amount of sulfuric acid, and the pH of the wastewater must be returned to neutral before coagulation and biochemistry, its application is greatly limited
And the effluent of acid-analyzed lignin is treated by Fenton oxidation, H 2 o 2 The utilization rate is low, the effluent must be adjusted to neutral with alkali, the amount of sludge is large, and the cost is high

Method used

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  • Method for improving biodegradability through heterogeneous Fenton oxidation treatment of cotton pulp black liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The pH value of cotton pulp black liquor from a company in Xinjiang is 10.5-11.5, SS is 512-654mg / L, COD Cr 20460mg / L, BOD 5 It is 7550mg / L, and the chroma is 1820 times. The cotton pulp black liquor and the deacidified water (pH=1.5) discharged from the viscose fiber production of the company are mixed in the first stirring reaction tank 1 at a volume ratio of 1:4.2, and adjusted The pH of the mixed wastewater is 3.5, the effluent enters the solid-liquid separation device 3 acid analysis method for 1 hour, filter and separate, collect the precipitated lignin for recycling, and the supernatant COD Cr 14800mg / L, BOD 5 It is 5020mg / L, and the chromaticity is 950 times, and the effluent enters the second stirring reaction tank 7 and H 2 o 2 The solution was mixed, and H was added 2 o 2 Industrial hydrogen peroxide with a mass concentration of 27%, H 2 o 2 The amount of solution added is 5ml / L, and the waste water and H 2 o 2 The mixed solution is transported under...

Embodiment 2

[0030] The pH value of cotton pulp black liquor from a Jiangsu company is 10.8-11.5, SS is 505-582mg / L, COD Cr 18860mg / L, BOD 5 It is 5700mg / L, and the chroma is 1700 times. The cotton pulp black liquor is mixed with the second bath water (pH=1.8) discharged from the company's viscose fiber production at a volume ratio of 1:4.2 and placed in the first stirring reaction tank 1. The pH of the mixed wastewater is 3.5, the effluent enters the solid-liquid separation device 3 acid analysis method for 1 hour, filter and separate, collect the precipitated lignin for recycling, and the supernatant COD Cr11900mg / L, BOD 5 It is 4593mg / L, and the chromaticity is 970 times, and the effluent enters the second stirring reaction tank 7 and H 2 o 2 The solution was mixed, and H was added 2 o 2 Industrial hydrogen peroxide with a mass concentration of 27%, H 2 o 2 The amount of solution added is 5ml / L, and the waste water and H 2 o 2 The mixed solution is transported under pressure by...

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Abstract

The invention relates to a method for improving biodegradability through heterogeneous Fenton oxidation treatment of cotton pulp black liquor. The method comprises the following steps: mixing cotton pulp black liquor and viscose wastewater according to a volume ratio of (1-1.5):4 to be added into a first stirring reaction tank (1), and regulating the pH value to be 2.5-3.5; enabling effluent to enter a solid-liquid separation device (3), treating by adopting an acid precipitation method for 1-2 hours, producing a precipitate, filtering and separating, recycling the obtained xylogen, enabling the supernatant effluent to enter a second stirring reaction tank (7) to be mixed with a H2O2 solution, conveying the mixture into a fixed bed reactor (5) filled with slag (6) by virtue of a pump (4),and performing heterogeneous Fenton oxidation treatment. According to the method disclosed by the invention, resources are fully recovered, the treatment cost is reduced, the wastewater biodegradability is improved, the aim of 'treatment of wastes with processes of wastes against one another' is achieved, the environmental pollution problem is comprehensively treated and solved, good conditions are created for subsequent biological treatment, and the method has excellent popularization and application prospects and environmental benefits.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a method for improving biodegradability of cotton pulp black liquor through heterogeneous Fenton-like oxidation treatment. Background technique [0002] The output of viscose fiber accounts for about 1 / 3 of the total output of chemical fiber, and it is the main chemical fiber variety. The main raw material for making viscose fiber is cotton pulp. Alkaline cooking and bleaching in the system. my country's cotton linters are relatively rich in resources, with a cellulose content of more than 90%, and a small amount of lignin, pectin, wax and ash. During the high-temperature and high-pressure alkali cooking process of cotton linters, some cellulose macromolecules undergo depolymerization, and the cellulose with a low degree of polymerization undergoes partial dissolution; hemicellulose is easier to digest than cellulose due to its low degree of polymerization a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/30
CPCC02F1/52C02F1/66C02F1/72C02F1/722C02F1/725C02F9/00C02F2103/30
Inventor 陈泉源杨梦婷卢钧杜夕铭唐聪姚远黄昭露
Owner DONGHUA UNIV
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