Method for treating oxytetracycline fungi residues

Abstract

The invention provides a treatment method of oxytetracycline fungi residues. According to the method, alkaline-hydrothermal pretreatment is adopted, then anaerobic digestion is combined to treat oxytetracycline fungi residues, organic matter is dissolved out by destroying the cell structure of microorganisms in the fungi residues, and the reduction effect is achieved. According to the method, thehighest removal rate of oxytetracycline in the oxytetracycline fungi residues can reach 99.99%, the treated oxytetracycline fungi residues can be reused as other production raw materials, comprehensive utilization of resources of the oxytetracycline fungi residues is achieved, and the method has very high environmental benefits and social benefits.

Description

technical field

[0001] The invention relates to the field of solid waste treatment, in particular to a treatment method for oxytetracycline bacteria residue. Background technique

[0002] Oxytetracycline (OTC) belongs to the tetracycline class of broad-spectrum antibiotics, and most of them are biological products, which are obtained through extraction through fermentation. They are widely used as veterinary drugs to prevent and treat food-borne animal diseases, and are currently the most consumed species in China. my country is a big country in the production of oxytetracycline. The annual output of oxytetracycline is 12,000 tons, and the export volume of oxytetracycline accounts for 70% of the total output. A large amount of oxytetracycline slag is produced during the fermentation process of oxytetracycline, and the production amount is about 1:10. The "National Hazardous Waste List" judges that oxytetracycline bacteria residue is toxic and hazardous waste. Fungal residue...

Examples

Embodiment 1

[0032] Such as figure 1 As shown, adopt the following method to process oxytetracycline bacteria residue:

[0033] (1) Use the alkali-hydrothermal method to pretreat the bacterial residue, inject a certain amount of water into the bacterial residue and stir evenly, adjust the moisture content to about 98%, and filter out the insoluble coarse residue, add 0.08-0.12 to the filtrate g / gTS NaOH solution, heat at 80-120°C for 2 hours, and discharge the supernatant after solid-liquid separation.

[0034] (2) Anaerobic digestion treatment of oxytetracycline bacteria residue, the solid residue after the treatment in step (1) was added to the single-stage UASB anaerobic reactor, which was pre-filled with 20.8g / L anaerobic activated sludge, and the load 1.5 kgVS / m3·d, stirred and fermented at 35-38°C for 20-30 days, and part of the biogas and biogas slurry produced by the fermentation was backfilled into the UASB reactor for cyclic fermentation.

Embodiment 2

[0036] The effects of different temperatures and NaOH dosages on the removal rate of oxytetracycline in oxytetracycline residue in step (1) of Example 1 were determined. In order to avoid chance and make the research results more convincing, no less than 10 repeated experiments were carried out for each reaction condition, and the results of each group were averaged, and the corresponding graphs were drawn.

[0037] Experimental results such as figure 2 , image 3 shown. figure 2 It is the change of oxytetracycline content in bacterial residue before and after alkali-hydrothermal treatment at different temperatures and NaOH dosages. Before treatment, oxytetracycline content was >1mg / mL, and after treatment, the reduction effect was obvious. image 3 It is the reduction rate of oxytetracycline in bacterial residues before and after alkali-hydrothermal treatment at different temperatures and NaOH dosages. The higher the temperature is, the higher the reduction rate is, while...

Embodiment 3

[0039] The effects of different temperatures and NaOH dosages on TS in oxytetracycline residue in step (1) of Example 1 were determined. In order to avoid chance and make the research results more convincing, no less than 10 repeated experiments were carried out for each reaction condition, and the results of each group were averaged, and the corresponding graphs were drawn.

[0040] Experimental results such as Figure 4 , Figure 5 shown. Figure 4 is the change of TS content in the fungal residue before and after alkali-hydrothermal treatment at different temperatures and NaOH dosages, Figure 5is the reduction rate of TS in the fungal residue before and after alkali-hydrothermal treatment at different temperatures and NaOH dosages. It can be seen from the figure that the TS before treatment is about 18000~20000mg / L, and after treatment, it all decreases, and the lowest reduction rate is 5 %about. As the reaction temperature increases, the TS reduction rate basically sh...

technical field

[0001] The invention relates to the field of solid waste treatment, in particular to a treatment method for oxytetracycline bacteria residue. Background technique

[0002] Oxytetracycline (OTC) belongs to the tetracycline class of broad-spectrum antibiotics, and most of them are biological products, which are obtained through extraction through fermentation. They are widely used as veterinary drugs to prevent and treat food-borne animal diseases, and are currently the most consumed species in China. my country is a big country in the production of oxytetracycline. The annual output of oxytetracycline is 12,000 tons, and the export volume of oxytetracycline accounts for 70% of the total output. A large amount of oxytetracycline slag is produced during the fermentation process of oxytetracycline, and the production amount is about 1:10. The "National Hazardous Waste List" judges that oxytetracycline bacteria residue is toxic and hazardous waste. Fungal residue...

Examples

Embodiment 1

[0032] Such as figure 1 As shown, adopt the following method to process oxytetracycline bacteria residue:

[0033] (1) Use the alkali-hydrothermal method to pretreat the bacterial residue, inject a certain amount of water into the bacterial residue and stir evenly, adjust the moisture content to about 98%, and filter out the insoluble coarse residue, add 0.08-0.12 to the filtrate g / gTS NaOH solution, heat at 80-120°C for 2 hours, and discharge the supernatant after solid-liquid separation.

[0034] (2) Anaerobic digestion treatment of oxytetracycline bacteria residue, the solid residue after the treatment in step (1) was added to the single-stage UASB anaerobic reactor, which was pre-filled with 20.8g / L anaerobic activated sludge, and the load 1.5 kgVS / m3·d, stirred and fermented at 35-38°C for 20-30 days, and part of the biogas and biogas slurry produced by the fermentation was backfilled into the UASB reactor for cyclic fermentation.

Embodiment 2

[0036] The effects of different temperatures and NaOH dosages on the removal rate of oxytetracycline in oxytetracycline residue in step (1) of Example 1 were determined. In order to avoid chance and make the research results more convincing, no less than 10 repeated experiments were carried out for each reaction condition, and the results of each group were averaged, and the corresponding graphs were drawn.

[0037] Experimental results such as figure 2 , image 3 shown. figure 2 It is the change of oxytetracycline content in bacterial residue before and after alkali-hydrothermal treatment at different temperatures and NaOH dosages. Before treatment, oxytetracycline content was >1mg / mL, and after treatment, the reduction effect was obvious. image 3 It is the reduction rate of oxytetracycline in bacterial residues before and after alkali-hydrothermal treatment at different temperatures and NaOH dosages. The higher the temperature is, the higher the reduction rate is, while...

Embodiment 3

[0039] The effects of different temperatures and NaOH dosages on TS in oxytetracycline residue in step (1) of Example 1 were determined. In order to avoid chance and make the research results more convincing, no less than 10 repeated experiments were carried out for each reaction condition, and the results of each group were averaged, and the corresponding graphs were drawn.

[0040] Experimental results such as Figure 4 , Figure 5 shown. Figure 4 is the change of TS content in the fungal residue before and after alkali-hydrothermal treatment at different temperatures and NaOH dosages, Figure 5is the reduction rate of TS in the fungal residue before and after alkali-hydrothermal treatment at different temperatures and NaOH dosages. It can be seen from the figure that the TS before treatment is about 18000~20000mg / L, and after treatment, it all decreases, and the lowest reduction rate is 5 %about. As the reaction temperature increases, the TS reduction rate basically sh...

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