Strengthening control method of photoelectro-Fenton pretreatment of tea polyphenol pharmaceutical wastewater

A technology for pharmaceutical wastewater and control methods, applied in chemical instruments and methods, light water/sewage treatment, water/sewage treatment, etc., can solve the problems of poor biodegradability and high COD, and achieve faster speed, high COD, and improved removal. The effect of efficiency

Inactive Publication Date: 2018-06-22
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0005] In view of the above-mentioned problems existing in the prior art, the object of the present invention is to provide a kind of intensified control method for pretreatment of tea polyphenol pharmaceutical wastewater by photoelectric Fenton method. The present invention uses the improved photoelectric Fenton technology to process tea polyphenols Pharmaceutical wastewater, no need for external agents, through electrochemical action and ultraviolet light irradiation, the cathode and anode electrodes spontaneously generate Fe in situ 2+ 、H 2 o 2 , the two react to produce strong oxidizing OH, and use its non-selective strong oxidation ability to degrade organic tea polyphenols, solve the problem of high COD and poor biodegradability of wastewater, thereby improving the quality of tea polyphenols in wastewater such as pharmaceutical wastewater Removal efficiency of refractory organic matter

Method used

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Examples

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Embodiment example 1

[0029] A method for intensified control of photoelectric Fenton pretreatment of tea polyphenol pharmaceutical wastewater of the present invention comprises the following steps:

[0030] 1) The COD of the pretreated tea polyphenol pharmaceutical wastewater is about 18000mg / L, and the tea polyphenol pharmaceutical wastewater is passed into the adjustment tank from the water inlet, and Ca(OH) is added to the adjustment tank 2 (4mol / L) Adjust the pH value of the wastewater to 3, and add 0.05mol / L Na 2 SO 4 As the electrolyte for the next photoelectric Fenton reaction, to improve the conductivity of the tea polyphenol pharmaceutical wastewater solution;

[0031] 2) Discharge the wastewater in the regulating pool in step 1) into the photoelectric Fenton oxidation pool, and submerge the wastewater in the photoelectric Fenton oxidation pool over the electrodes;

[0032] 3) Power on the photoelectric Fenton oxidation cell with a current density of 3mA / m 3 , energized time 150min, an...

Embodiment 2

[0036] A kind of photoelectric Fenton pretreatment method for strengthening control of tea polyphenol pharmaceutical wastewater of the present invention comprises the following processes:

[0037] 1) The COD of the pretreated tea polyphenols pharmaceutical wastewater is about 23000mg / L, first pass it into the regulating tank, and add Ca(OH) 2 (4mol / L) adjust the pH value of the wastewater to 3.5, and add 0.05mol / L Na 2 SO 4 As the electrolyte for the next photoelectric Fenton reaction, to improve the conductivity of the tea polyphenol pharmaceutical wastewater solution;

[0038] 2) The effluent from the regulating pool enters the electric Fenton oxidation pool;

[0039] 3) The wastewater in the reaction pool does not pass through the electrodes, and the current density is 2.5mA / m 3 , energized time 120min, anodic oxidation produces Fe 2+ , the cathodic reduction produces H 2 o 2 Under the action of sodium sulfite in the electrolyte, the Fenton reaction produces OH with s...

Embodiment example 3

[0043] A kind of photoelectric Fenton pretreatment method for strengthening control of tea polyphenol pharmaceutical wastewater of the present invention comprises the following processes:

[0044] 1) The COD of the pretreated tea polyphenol pharmaceutical wastewater is about 19500mg / L, first pass it into the regulating tank, and add Ca(OH) 2 (4mol / L) adjust the pH value of the wastewater to 2.6, and add 0.05mol / L Na 2 SO 4 As the electrolyte for the next photoelectric Fenton reaction, to improve the conductivity of the tea polyphenol pharmaceutical wastewater solution;

[0045] 2) The effluent from the regulating pool enters the electric Fenton oxidation pool;

[0046] 3) The wastewater in the reaction pool does not pass through the electrodes, and the current density is 3.5mA / m 3 , energized time 120min, anodic oxidation produces Fe 2+ , the cathodic reduction produces H 2 o 2 , under the action of sodium sulfite in the electrolyte, the Fenton reaction produces OH with ...

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Abstract

The invention discloses a strengthening control method of photoelectro-Fenton pretreatment of tea polyphenol pharmaceutical wastewater. The strengthening control comprises the following steps: (1) firstly introducing tea polyphenol pharmaceutical wastewater into an adjusting tank, adding Ca(OH)2 to adjust the pH value of the wastewater to 2.5-4, and adding Na2SO4 as an electrolyte of a subsequentphotoelectro-Fenton reaction so as to improve the electrical conductivity of the tea polyphenol pharmaceutical wastewater solution; and (2) introducing the adjusted effluent to a photoelectro-Fenton oxidation reaction tank. According to the strengthening control method provided by the invention, a three-electrode reaction and ultraviolet lamp irradiation are adopted; a H2O2 water solution is automatically generated by an electrochemical method in a certain amount of the sodium sulfate electrolyte; and no additional Fe is needed, the inconvenience caused by the addition of H2O2 is avoided, andthe use cost of additional reagents is reduced. Compared with a conventional Fenton reaction, the method provided by the invention has the additional ultraviolet lamp irradiation, and oxygen in the solution can be promoted to generate H2O2, so that more .OH is generated, and the degradation of organic matter in the wastewater solution is improved.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, in particular to an intensified control method for photoelectric Fenton pretreatment of tea polyphenol pharmaceutical waste water. Background technique [0002] Tea polyphenols have a series of special pharmacological functions such as enhancing the body's resistance, anti-oxidation, anti-cancer, anti-tumor, anti-radiation, antibacterial, anti-virus, lowering blood sugar and blood lipids, preventing cardiovascular diseases, anti-aging, and precipitating heavy metals. Therefore, it has become the raw material for the production of many health medicines (such as Xinnaojian Tablets). In order to ensure the purity of the extract, the extraction process of tea polyphenols in the pharmaceutical industry is relatively conservative and the extraction rate of tea polyphenols is low. Therefore, the tea polyphenol wastewater produced by the extraction process is more suspended than the tea pol...

Claims

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Application Information

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IPC IPC(8): C02F1/32C02F1/461C02F1/72C02F103/36
CPCC02F1/32C02F1/46109C02F1/4672C02F2001/46133C02F2103/343C02F2103/36C02F2201/4618C02F2305/026
Inventor 黄新文宋郦蓉王冠玉杨万全蒋安桦
Owner ZHEJIANG UNIV OF TECH
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