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Method for purifying gallic acid production waste water through nanometer silica gel

A technology for producing gallic acid and wastewater, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, multi-stage water treatment, etc., to achieve the effects of simplified resource recycling, low economic cost, and low cost

Inactive Publication Date: 2017-03-08
JISHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no report on the "adsorption-recovery" treatment of gallic acid and other organic components in gallic acid production wastewater by using nano-silica gel materials

Method used

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  • Method for purifying gallic acid production waste water through nanometer silica gel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Processing wastewater of gallnut treated with the maximum dosage of nano-silica gel

[0023] pH value 1.41, gallic acid content 1.46%, salt content 10.21%, COD CrThe 28086 mg / L gall processing wastewater was adjusted to pH 10 with lime milk with a concentration of 15% by mass in the storage tank, and then introduced into the first-level flocculation sedimentation tank. Add calcium metasilicate nanogel at a dosage of 50 g / L to the first-level flocculation tank, stir and adsorb for 4 hours, and then precipitate for 2 hours. The wastewater treated in the primary tank flows into the secondary flocculation tank, and the amount of calcium metasilicate nanogel added is 50g / L, stirred and adsorbed for 3 hours, and then precipitated for 2 hours. The gallic acid removal rate of the wastewater purified by this secondary flocculation tank is 93.57%, and the wastewater COD = 88.75mg / L.

[0024] The nano-silica gel precipitate in the primary or secondary flocculation sed...

Embodiment 2

[0026] Example 2: The minimum dosage of nano-silica gel to treat the processing wastewater of Galla japonica

[0027] pH value 1.41, gallic acid content 1.46%, salt content 10.21%, COD Cr The 28086 mg / L gall processing wastewater was adjusted to pH 10 with lime milk with a concentration of 15% by mass in the storage tank, and then introduced into the first-level flocculation sedimentation tank. Add calcium metasilicate nanogel at a dosage of 40 g / L to the primary flocculation tank, stir and adsorb for 4 hours, and then precipitate for 2 hours. The wastewater treated in the primary tank flows into the secondary flocculation tank, and the amount of calcium metasilicate nanogel added is 40g / L, stirred and adsorbed for 3 hours, and then precipitated for 2 hours. The gallic acid removal rate of the wastewater purified by this secondary flocculation tank is 90.24%, and the wastewater COD = 94.46mg / L.

[0028] The nano-silica gel precipitate in the primary or secondary flocculation...

Embodiment 3

[0030] Example 3: Optimum dosage of nano-silica gel to treat processing wastewater of gallnut

[0031] pH value 1.41, gallic acid content 1.46%, salt content 10.21%, COD Cr The 28086 mg / L gall processing wastewater was adjusted to pH 10 with lime milk with a concentration of 15% by mass in the storage tank, and then introduced into the first-level flocculation sedimentation tank. Add calcium metasilicate nanogel at a dosage of 50 g / L to the first-level flocculation tank, stir and adsorb for 4 hours, and then precipitate for 2 hours. The wastewater treated in the primary tank flows into the secondary flocculation tank, and the amount of calcium metasilicate nanogel added is 40g / L, stirred and adsorbed for 3 hours, and then precipitated for 2 hours. The wastewater purified by this secondary flocculation tank has a gallic acid removal rate of 92.26% and wastewater COD = 90.05mg / L.

[0032] The nano-silica gel precipitate in the primary or secondary flocculation sedimentation ta...

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Abstract

The invention provides a method for purifying gallic acid production waste water through nanometer silica gel. The method comprises steps as follows: the waste water is neutralized with lime milk until the pH value of the waste water is appropriate; gallic acid and other organic ingredients in the waste water are adsorbed with calcium metasilicate nanogel; the gel material adsorbing the organic ingredients in the waste water is acidized through hydrochloric acid, so that gallic acid and other ingredients are subjected to desorption; the pH value of the nanogel subjected to desorption is adjusted through lime milk, and the adsorption capacity of the nanogel is regenerated under the condition of a proper pH value. With the adoption of the method, at least 92% of gallic acid in the gallic acid production waste water can be recycled, color-generating organic ingredients in the waste water can also be adsorbed, accordingly, the COD (chemical oxygen demand) value of the waste water can be effectively reduced, the chromaticity of the waste water is reduced remarkably, the water quality of discharged waste water meets the GB21905-2008 second-grade discharge standard, and the difficult technical problem about meeting the standards of good treatment effect, little environment investment and low operation cost for treatment of waste water during production of gallic acid can be better solved.

Description

technical field [0001] The invention relates to the technical field of industrial waste water treatment, in particular to a method for purifying waste water generated when gallic acid is produced by using raw materials such as gallnut, tara, maple and the like. Characterized by high sodium chloride content and high chroma. Background technique [0002] Gallic acid, also known as gallic acid, is widely present in plants such as gall, tara, maple, etc. It is a polyphenolic substance that exists in nature and is widely used in food, biology, medicine, chemical industry and other fields. [0003] The main technologies for producing gallic acid are: acid hydrolysis, alkaline hydrolysis, fermentation and enzymatic hydrolysis. The acid hydrolysis method has high consumption of raw materials, serious equipment rot, large output of waste liquid and difficult treatment, and has been eliminated at present. Fermentation method and enzymatic hydrolysis method have been difficult to put...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/52C02F103/36
CPCC02F1/281C02F1/5236C02F1/66C02F2103/36C02F2301/08
Inventor 唐克华成江姚姝凤彭焱
Owner JISHOU UNIVERSITY
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