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Treatment method for recycling gallic acid enzymatic production wastewater

A technology for production wastewater and treatment methods, which is applied in energy wastewater treatment, natural water treatment, water/sewage treatment, etc., can solve the problems of high resin bed resistance, resin loss regeneration efficiency, low gallic acid adsorption capacity, etc. The effect of running stability and improving recycling efficiency

Active Publication Date: 2021-09-10
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are the following problems in directly adopting the existing resin method to process the gallic acid enzymatic production wastewater: (1) the enzymatic production of gallic acid water extraction process will produce a large amount of refractory colloidal substances, thereby making the gallic acid enzymatic production wastewater viscous high, This leads to problems such as high resistance of the resin bed and easy blockage of the bed by colloidal substances; (2) current commercially available resins have problems such as low adsorption capacity of gallic acid, serious resin loss, and low regeneration efficiency

Method used

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  • Treatment method for recycling gallic acid enzymatic production wastewater

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Experimental program
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Embodiment 1

[0038] A treatment method for recycling waste water produced by gallic acid enzymatic method, specifically comprising:

[0039] Step 1: Heat hydrolysis

[0040] Add the mother liquor obtained after gallic acid crystallization and filtration into the autoclave, raise the temperature to 120°C and keep it warm for 1 hour, and then lower it to room temperature;

[0041] Step 2: Centrifugal Filtration

[0042]Use a drum centrifuge to centrifugally filter the reacted and cooled mother liquor at a speed of 1500rad / min to obtain the primary filtrate; then place the primary filtrate for 20 minutes and perform secondary filtration to obtain the secondary filtrate, which is Transparent purple-black filtrate; wherein, centrifugal filtration and secondary filtration are all filtered with 800-mesh filter cloth;

[0043] Step 3: Resin Adsorption

[0044] Perform resin column adsorption on the purple-black filtrate so that the final gallic acid content in the effluent is less than 500 mg / L...

Embodiment 2

[0053] A treatment method for recycling waste water produced by gallic acid enzymatic method, specifically comprising:

[0054] Step 1: Heat hydrolysis

[0055] Add the mother liquor obtained after gallic acid crystallization and filtration into an autoclave, raise the temperature to 130°C and keep it warm for 5 hours, and then lower it to room temperature;

[0056] Step 2: Centrifugal Filtration

[0057] Use a drum centrifuge to centrifugally filter the reacted and cooled mother liquor at a speed of 2000 rad / min to obtain the primary filtrate; then place the primary filtrate for 25 minutes and perform secondary filtration to obtain the secondary filtrate, which is Transparent purple-black filtrate; wherein, centrifugal filtration and secondary filtration are all filtered with 1000-mesh filter cloth;

[0058] Step 3: Resin Adsorption

[0059] Perform resin column adsorption on the purple-black filtrate so that the final gallic acid content in the effluent is less than 500 m...

Embodiment 3

[0068] A treatment method for recycling waste water produced by gallic acid enzymatic method, specifically comprising:

[0069] Step 1: Heat hydrolysis

[0070] Add the mother liquor obtained after gallic acid crystallization and filtration into the autoclave, raise the temperature to 150°C and keep it warm for 5 hours, and then lower it to room temperature;

[0071] Step 2: Centrifugal Filtration

[0072] Use a drum centrifuge to centrifugally filter the reacted and cooled mother liquor at a speed of 2000rad / min to obtain the primary filtrate; then place the primary filtrate for 30 minutes and perform secondary filtration to obtain the secondary filtrate, which is Transparent purple-black filtrate; wherein, centrifugal filtration and secondary filtration are all filtered with 1500 mesh filter cloth;

[0073] Step 3: Resin Adsorption

[0074] Perform resin column adsorption on the purple-black filtrate so that the final gallic acid content in the effluent is less than 500 m...

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Abstract

The invention discloses a treatment method for recycling gallic acid enzymatic production wastewater. The treatment method specifically comprises the following steps: heating and hydrolyzing mother liquor obtained after crystallizing and filtering of gallic acid, and then conducting cooling to room temperature; performing centrifugal filtration treatment to obtain transparent purple black filtrate; carrying out resin column adsorption so as to enable the gallic acid content of final effluent to be less than 500mg / L; and carrying out desorption by adopting a sodium hydroxide solution to obtain a desorption solution of gallic acid. Aiming at the industrial problem that the waste water produced by a gallic acid enzyme method contains a large amount of high-viscosity colloidal substances, so that resin pore channels are blocked in the process of recycling gallic acid by adopting a resin method, the colloidal substances are effectively degraded into small molecular compounds by adopting an acidic heating hydrolysis method, so that the problem is effectively solved. Besides, three types of composite resins are developed aiming at the characteristics of gallic acid and a recovery process, so that the adsorption capacity, the regeneration efficiency and the mechanical strength of the resin are effectively improved. In a word, the method integrates wastewater standard treatment and recycling, and has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of wastewater resource treatment, in particular to a treatment method for resource recovery of wastewater produced by gallic acid enzymatic method. Background technique [0002] Gallic acid, chemical name 3,4,5-trihydroxybenzoic acid, as an important fine chemical product, is widely used in food, biology, medicine, chemical industry and other fields. [0003] At present, gallic acid production technology mainly includes acid hydrolysis, alkali hydrolysis, fermentation and enzymatic method. Among them, the enzymatic method has advantages due to its mild reaction conditions (atmospheric pressure, 40-50°C), complete hydrolysis of raw materials, and few by-products. However, the enzymatic production of gallic acid will inevitably produce a large amount of high-concentration refractory organic wastewater. Therefore, how to effectively treat such wastewater is the key to green and efficient production of gallic ...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F101/34C02F103/36
CPCC02F9/00C02F1/025C02F1/285C02F1/38C02F1/001C02F2303/16C02F2103/36C02F2101/34Y02W10/37
Inventor 吕路吕飞张纯钢姜杰张炜铭潘丙才
Owner NANJING UNIV