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A method for purifying and treating waste water produced by gallic acid with nano-silica gel

A technology for gallic acid and waste water production, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, natural water treatment, etc., to achieve the effect of simplified process, simplified resource recovery and low cost

Inactive Publication Date: 2019-05-17
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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  • A method for purifying and treating waste water produced by gallic acid with nano-silica gel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Treatment of processing wastewater from Galla Chinensis with the maximum dosage of nano silicone gel

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

[0024] Adjust the pH of the nano-silica gel sediment in the primary...

Embodiment 2

[0026] Example 2: Treatment of processing wastewater from Galla Chinensis with minimum dosage of nano-silicon gel

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

[0028] Adjust the pH of the nano-silica gel sediment in the primary or s...

Embodiment 3

[0030] Example 3: The optimal dosage of nano silicone gel is used to treat the processing wastewater of Chinese gall

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

[0032] Adjust the pH of the nano-silica gel sediment in the primary o...

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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 present invention relates to the technical field of industrial wastewater treatment, in particular to a method for purifying wastewater produced when gallic acid is produced by using raw materials such as gallnut, tara, tea twig maple, etc. The wastewater has "four highs", namely: high acidity, high organic matter concentration, Features high sodium chloride content and high chroma. Background technique [0002] Gallic acid, also known as gallic acid, is widely present in plants such as gallnut, tara, and maple. It is a polyphenolic substance that exists in nature and is widely used in food, biology, medicine, chemical and other fields. [0003] The main process technologies for producing gallic acid are: acid hydrolysis, alkali hydrolysis, fermentation and enzymatic hydrolysis. The acid hydrolysis method has high raw material consumption, serious equipment rot, and large waste liquid output and difficult to handle. It has now been eliminated. Fermentat...

Claims

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Application Information

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Patent Type & Authority Patents(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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