Method for recycling alkali treatment lignocellulose waste fluid

A technology for recycling lignocellulose and waste liquid, which is applied in the field of waste resource utilization and environmental protection, can solve problems such as unfavorable industrial application and environmental pollution, and achieve the advantages of reuse, reduction of water consumption, and reduction of process operating costs. Effect

Active Publication Date: 2016-02-03
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, alkali treatment will produce a large amount of waste liquid, causing environmental pollution, which is not conducive to its industrial application

Method used

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  • Method for recycling alkali treatment lignocellulose waste fluid

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Effect test

Embodiment 1

[0026] A method for recycling lignocellulose waste liquid by alkali treatment, comprising the following steps:

[0027] (1) Take bagasse that has been sieved to 40-60 meshes and put it in the reaction kettle, add a 2% NaOH solution with a mass concentration of 2% at a solid-to-liquid ratio of 1:10 (g absolute dry material / mL), at 60°C and 100rpm After processing for 3h, adopt the method of filtration to carry out solid-liquid separation, collect alkali treatment waste liquid I and lignocellulose treatment residue;

[0028] (2) Add water to the reaction kettle, use the residual heat of the kettle body to preheat the hot water to 40°C, and wash the lignocellulose treatment residue in step 1 with water at a solid-to-liquid ratio of 1:10 (g absolute dry material / mL) for 3 times, Collect waste washing liquid II;

[0029] (3) adjust the pH of waste liquid I and waste liquid II with acetic acid to be 4.0 respectively, alkali lignin is separated out, and adopts the centrifugal method...

Embodiment 2

[0033] A method for recycling lignocellulose waste liquid by alkali treatment, comprising the following steps:

[0034] (1) Take bagasse that has been sieved to 40-60 meshes and put it in the reaction kettle, add a NaOH solution with a mass concentration of 1.5% at a solid-to-liquid ratio of 1:15 (g absolute dry material / mL), and put it under the conditions of 70°C and 100rpm After processing 2.5h, adopt the method for filtering to carry out solid-liquid separation, collect alkali treatment waste liquid I and lignocellulose treatment residue;

[0035] (2) Add water to the reaction kettle, use the residual heat of the kettle body to preheat the hot water to 45°C, and wash the lignocellulose treatment residue in step 1 with water at a solid-to-liquid ratio of 1:8 (g absolute dry material / mL) for 4 times, Collect waste washing liquid II;

[0036] (3) Use acetic acid to adjust the pH of waste liquids I and II to 4.0, and the alkali lignin is separated out, and the solid-liquid se...

Embodiment 3

[0040] A method for recycling lignocellulose waste liquid by alkali treatment, comprising the following steps:

[0041](1) Take the bagasse that has been sieved to 40-60 meshes and place it in the reaction kettle, add a 1% NaOH solution with a mass concentration of 1% at a solid-to-liquid ratio of 1:20 (g absolute dry material / mL), and put it under the conditions of 80°C and 100rpm After processing for 2h, adopt the method of filtration to carry out solid-liquid separation, collect alkali treatment waste liquid I and lignocellulose treatment residue;

[0042] (2) Add water to the reaction kettle, use the residual heat of the kettle body to preheat the hot water to 50°C, and wash the lignocellulose treatment residue in step 1 with water at a solid-to-liquid ratio of 1:5 (g absolute dry material / mL) for 4 times, Collect waste washing liquid II;

[0043] (3) Use acetic acid to adjust the pH of waste liquids I and II to 4.0, and the alkali lignin is separated out, and the solid-l...

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Abstract

The invention relates to a method for recycling alkali treatment lignocellulose waste fluid. The method comprises the following steps: 1) adopting alkali liquor treatment lignocellulose to perform solid-liquid separation, and obtaining lignocellulose treatment residue and waste fluid I; 2) washing the lignocellulose treatment residue in the step 1), and collecting washing waste fluid II; 3) adjusting the pH of the waste fluid I and the waste fluid II, precipitating lignin, performing centrifugal separation to obtain alkali lignin, supernatant II 1 and supernatant I 1 for biogas fermentation, and mixing the supernatant II 1 with the lignocellulose treatment residue washed in the step 2); 4) adjusting the pH of the mixed system of the supernatant II 1 and the lignocellulose treatment residue in step 2), adding cellulase for enzymolysis, and obtaining hydrolysate obtaining fermentable sugars. According to the method for recycling alkali treatment lignocellulose waste fluid, the recycling of the waste fluid in the lignocellulose alkali pretreatment process is achieved, no environmental pollution is caused, and the process operating cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of waste resource utilization and environmental protection, and in particular relates to a method for recycling lignocellulose waste liquid by alkali treatment. Background technique [0002] The use of waste lignocellulose to produce chemicals, biofuels, and bio-based materials not only turns waste into wealth, but also reduces environmental pollution has become a research hotspot in recent years. The composition and structure of lignocellulose are complex, mainly composed of cellulose, hemicellulose and lignin combined by covalent and non-covalent bonds. The development and utilization of lignocellulose is mainly aimed at these three components. [0003] Degradation of cellulose and hemicellulose into fermentable sugars as a carbon source for microbial fermentation to produce biofuels, biochemicals, etc. is an aspect of the development and utilization of lignocellulose. The commonly used technical means a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P19/14C12P5/02C08H7/00
CPCY02E50/30
Inventor 袁振宏王闻庄新姝亓伟余强王琼刘云云谭雪松周桂雄
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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