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Method for treating crude wastewater of gallic acid

A technology of gallic acid and waste liquid, which is applied in the field of processing crude waste liquid of gallic acid produced from Galla or Tara, can solve the problems of difficult treatment, pollution of the ecological environment, low biochemical degradability, etc., and achieve good promotion value, the effect of reducing environmental pollution

Inactive Publication Date: 2011-06-01
CHANGSHA ENVIRONMENTAL PROTECTION COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The crude waste liquid mainly contains salt, acid, pectin, lignin, colored substances, glucose, complex oligosaccharides, unhydrolyzed tannins, gallic acid, etc. The crude waste liquid is high in color (dark brown), High acidity (pH=1.0 or so), high concentration (CODc r =50000mg·L -1 Left and right), low biodegradability, extremely difficult to deal with, seriously polluting the ecological environment of the local and surrounding areas, it is imminent to solve the pollution problem of waste water and waste residue in the production process of gallic acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026](1) Filtration and catalytic oxidation treatment of crude gallic acid waste liquid: the pH value of the waste liquid is adjusted to 2.0 with sodium hydroxide solution, the temperature is 10-30°C, and 30% by mass is added to each 1L of waste liquid Hydrogen peroxide 80mL, hydrogen peroxide and Fe 2+ Dosing FeSO at a molar mass ratio of 10:1 4 ·7H 2 0, the reaction time is 45min;

[0027] (2) pH adjustment and precipitation treatment of the wastewater after catalytic oxidation treatment: neutralize the wastewater after catalytic oxidation treatment with lime, adjust the pH to 7, let it stand for 1 hour to fully precipitate, and further add 2 per liter of wastewater to the clear liquid gram activated carbon adsorption decolorization;

[0028] (3) Aerobic biological treatment of wastewater: Dilute the wastewater after catalytic oxidation treatment, pH adjustment, precipitation treatment, and activated carbon adsorption decolorization by an appropriate multiple, so that th...

Embodiment 2

[0030] (1) Filtration and catalytic oxidation treatment of crude gallic acid waste liquid: keep the original pH value of the waste liquid at 1.0, carry out at a temperature of 10-30°C, add 100mL of hydrogen peroxide with a mass percentage concentration of 30% to each 1L of waste liquid, with Fe 2+ Dosing FeSO at a molar mass ratio of 10:1 4 ·7H 2 0, the reaction time is 30min;

[0031] (2) pH adjustment and precipitation treatment of wastewater after catalytic oxidation treatment: neutralize the wastewater after catalytic oxidation treatment with lime, adjust the pH to 8, let it stand for 2 hours to fully precipitate, and further add 1 gram activated carbon adsorption decolorization;

[0032] (3) Aerobic biological treatment of wastewater: Dilute the wastewater after catalytic oxidation treatment, pH adjustment, precipitation treatment, and activated carbon adsorption decolorization by an appropriate multiple, so that the CODcr of the wastewater is controlled at 1800mg / L, a...

Embodiment 3

[0034] (1) Filtration and catalytic oxidation treatment of crude gallic acid waste liquid: the pH value of the waste liquid is adjusted to 2.0 with lye, the temperature is carried out at 10-30 ° C, and 30% hydrogen peroxide is added to every 1 L of waste liquid 60mL, hydrogen peroxide and Fe 2+ Dosing FeSO at a molar mass ratio of 10:1 4 ·7H 2 0, the reaction time is 60min;

[0035] (2) pH adjustment and precipitation treatment of the wastewater after catalytic oxidation treatment: neutralize the wastewater after catalytic oxidation treatment with sodium hydroxide, adjust the pH to 8, and let it stand for 1.5 hours to fully precipitate, and the clear liquid is further charged at a rate of 1 liter per liter Add 1.5 grams of activated carbon to the wastewater for adsorption and decolorization.

[0036] (3) Aerobic biological treatment of wastewater: Dilute the wastewater after catalytic oxidation treatment, pH adjustment, precipitation treatment and activated carbon adsorptio...

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Abstract

The invention discloses a treatment method for treating crude wastewater of gallic acid, comprising the following steps: (1) filtrating and catalytically oxidizing the crude wastewater of gallic acid, (2) adjusting the PH value of the catalytically oxidized wastewater and then carrying out sedimentation process on the wastewater and carrying out absorption bleaching on the wastewater by the active carbon. (3) diluting the processed wastewater by a proper fold and performing the aeration aerobic biological treatment on the wastewater to finally make wastewater discharge meet the discharge standard of industrial wastewater. The invention solves the problem of bad effect of single treatment adopted due to the high acidity, high COD thickness, high chroma, complicated pollutant components andunsatisfactory biodegradability of the crude wastewater of the gallic acid, and provides an effective method to treat crude wastewater of the gallic acid and alleviates the environmental pollution.

Description

technical field [0001] The invention relates to a method for processing the crude waste liquid of gallic acid, in particular to a method for processing the crude waste liquid of gallic acid produced from Galla or Tara. Background technique [0002] Vegetable tannin refers to the polyphenolic substances present in plants that can make raw skin into leather, and it is extracted from forestry waste such as roots, stems, leaves, fruit shells, and bark of vegetable tannins rich in tannins. According to its chemical structure, it is divided into hydrolyzed tannin and condensed tannin, and hydrolyzed tannin is further divided into ellagitannin and gallotannin according to the difference of its hydrolyzed products. [0003] In nature, there are hundreds of tannin-containing plants, and dozens of them can be used to produce tannin products. The plant raw materials rich in gallic tannins mainly include Chinese gallnut and Turkish gallnut. , Tara fruit pods, sumac leaves, yellow leave...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F3/12C02F1/66C02F1/72C02F1/52C02F103/26
CPCY02W10/10
Inventor 刘扬林刘淑云刘妍妍
Owner CHANGSHA ENVIRONMENTAL PROTECTION COLLEGE