Decolorization of Fermented Pharmaceutical Wastewater

Fermentation Pharmaceuticals is a process in which artificially cultivated microorganisms use a highly complex biochemical reaction process to synthesize specific drugs under the action of a specific enzyme system in the body. As the domestic and foreign markets increase the demand for fermentation drugs, the fermentation pharmaceutical industry Has become the fastest growing field in the domestic pharmaceutical industry. The input of raw materials for the production of fermentation drugs is large, and the output ratio is relatively small. Fermentation pharmaceutical wastewater is generally based on the intermittent discharge form, and the fermented pharmaceutical wastewater has the characteristics of deep color and poor biodegradability. One of the most difficult to treat industrial waste water recognized in various fields of society, the use of three-dimensional electrolysis can achieve decolorization of fermented pharmaceutical wastewater.

I. Three-dimensional electrolytic treatment mechanism of fermented pharmaceutical wastewater

The three-dimensional electrolysis treatment is mainly a method of electrochemically treating various removal mechanisms. The use of electrode reactions can destroy the stability of the molecules in the fermentation pharmaceutical wastewater, open the ring molecules, and break the chains of large molecules, and the waste water is in the electrolysis process. The material can be flocculated or precipitated, so that the effect of purifying and decolorizing the fermented pharmaceutical wastewater can be achieved. Three-dimensional electrolysis is a waste water treatment mechanism proposed in the late 1960s. In the traditional two-dimensional electrolyzer electrodes, granular or other debris-like working electrode materials are loaded to ensure that the newly added working electrode surface is charged. In this way, a new electrode can be formed. The surface of this electrode can treat the pollutants in the wastewater by electrochemical reaction. The three-dimensional electrode method generally does not use or use a small amount of chemical drugs in the treatment process of the fermented pharmaceutical wastewater, and the treatment mechanism has the characteristics of small footprint, high processing efficiency, and no secondary pollution during operation. The three-dimensional electrolytic treatment of fermented pharmaceutical wastewater is a dynamic process in nature. Activated carbon particles must have a large specific surface area and a good electric conductor. In a DC electric field, carbon particles can form a relatively smiling electrolytic cell due to their own electrical charge. When an electrolytic reactor is used, When the voltage reaches the decomposition voltage of the contaminants in the fermented pharmaceutical wastewater, an electrolysis reaction can be performed to remove contaminants in the fermentation pharmaceutical wastewater. Three-dimensional electrolysis utilizes this mechanism to decolorize the fermented pharmaceutical wastewater, and can also reduce the fermentation. COD in pharmaceutical wastewater.

Second, three-dimensional electrolytic treatment of pharmaceutical wastewater treatment program design

1. Device design:

As shown in Figure 1, the electrolytic cell reactor is mainly made of organic glass plates in the design process, the size of the device can be adjusted according to actual needs, and the bottom of the electrolytic cell reactor needs to be installed with a uniform distribution of porous For the gas distribution plate, it is generally necessary to control the standard of the gas distribution hole to be about 1 mm in diameter, and use the porous gas hose under the gas distribution plate to introduce compressed air. The anode of the electrolyzer reactor mainly uses stainless steel plate as the main material. The cathode of the reactor mainly uses graphite plate as the main material. The effective working area of ​​the electrode plate during operation is required to be controlled at about 50cm 2 through the water level, and the specific operational state of the reactor. You can use the two sets of electrodes to react based on the size of the device. In the design process, a non-diaphragm electrolytic cell is mainly selected. The third electrode material in the entire treatment device mainly uses activated carbon particles with a size of 10 mesh. During the operation of the electrolytic cell reactor, the third electrode needs to be placed between the electrode plates. The entire device needs to use dilute sulfuric acid to activate the surface of the third pole when the entire device starts to operate. In the treatment of the fermented pharmaceutical wastewater, it is necessary to use an oscillating adsorption method to remove the adsorption capacity.

2. Analysis of the effects of the device for processing fermented pharmaceutical wastewater: A preliminary test was conducted before the above device was put into use. The initial reaction conditions of the entire test were designed to be pH 5, electrolysis time 30 min, and activated carbon addition amount 10 g/L. During the process, the current density is changed, and the current density to be changed generally needs to be controlled at 10 mA/cm2, 20 mA/cm2, 30 mA/cm2, 40 mA/cm2, 50 mA/cm2, and 60 mA/cm2 during the test. The spacing of the fixed electrode plates was controlled to 3 cm. During the test, the variation of the removal rate of the pollutants from the fermentation pharmaceutical wastewater was measured under different current densities. Increasing the current density during the operation of the device can increase the removal rate of pollutants. When the voltage on the particles is less than the decomposition voltage, no reaction current will be generated. At this stage, the removal rate of pollutants from fermented pharmaceutical wastewater is relatively small. However, when the current density of the device is raised to 40 mA/cm2, the reaction current will pass through the third pole, and the removal rate of COD in the waste water at this stage has been greatly improved. When the current density in the device was increased to 60 mA/cm2, there was no significant change in the contaminant removal rate of the fermented pharmaceutical wastewater. This is because the current density on the activated carbon electrode is too high and some side reactions will occur.

Third, the conclusion

To sum up, the test proved that the designed three-dimensional electrolysis treatment of pharmaceutical wastewater has excellent effects, especially in the three-dimensional electrolytic treatment of fermented pharmaceutical wastewater with a very effective decolorization, to ensure that the fermentation of pharmaceutical wastewater through the three-dimensional electrolytic treatment can reach emission standards .

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