A method for harmless treatment and resource utilization of abamectin production wastewater

Abstract

The present application relates to a kind of abamectin production wastewater harmless treatment and resource utilization method.The present method includes the following steps: precipitating with microbial flocculants, then transferring into internal circulation biological aerobic fluidized bed, using chlorella algae carbon adsorbent and tea dregs biological carbon composite biological adsorbent as carrier, supplemented by ultraviolet (UV) light, finally partially replacing abamectin fermentation process water, adding green biological surfactant to the precipitate after flocculation, and using aerobic composting to produce biological fertilizer.The present method can greatly reduce the system processing operation cost, speed up the abamectin wastewater treatment cycle, and the treatment effect is stable and reliable, ensuring the stability of effluent water quality, facilitating operation, maintenance and management, without causing secondary pollution, and the wastewater and flocculation precipitate are all recycled, greatly improving the comprehensive treatment ability of wastewater, social benefit, environmental benefit and comprehensive economic benefit.

Description

Technical Field

[0001] This invention belongs to the technical field of harmless treatment and resource utilization of antibiotic wastewater, specifically relating to a method for harmless treatment and resource utilization of avermectin production wastewater. Background Technology

[0002] Avermectin production wastewater is a type of high-concentration, recalcitrant organic wastewater characterized by complex composition, high suspended solids content, high color, poor biodegradability, and high sugar content. If this type of wastewater is directly discharged into water bodies, the residual antibiotic units and their byproducts will severely harm the ecological balance for a considerable period. Currently, commonly used methods for treating antibiotic production wastewater in my country include physicochemical treatment, biochemical treatment, and combinations of these technologies. However, compared to traditional activated sludge treatment methods for antibiotic wastewater, these methods generally suffer from low treatment efficiency, antibiotic residues, complex processes, uncertain byproducts, aging activated sludge, large volumes of excess sludge, large land area requirements, high operating costs, and unpleasant odors, among other environmental problems. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method for the harmless treatment and resource utilization of avermectin production wastewater that can significantly shorten the treatment cycle, simplify the process, reduce energy consumption, degrade antibiotic residues in wastewater, significantly improve effluent quality, and is safe and environmentally friendly. This invention combines bioremediation and photodegradation technologies, utilizing an airlift-type internal circulation aerobic fluidized bed as the reaction tank, and using Chlorella algae carbon and tea residue biochar as composite biosorbent carriers, supplemented by ultraviolet light irradiation, thereby achieving a method for the harmless treatment and resource utilization of avermectin wastewater.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A method for the harmless treatment and resource utilization of avermectin production wastewater includes the following steps:

[0006] (1) Wastewater pretreatment: The abamectin wastewater is transferred to the equalization tank and the pH value is adjusted by the regulator;

[0007] (2) Sedimentation and flocculation: The wastewater after pH adjustment in step (1) is transferred to a sedimentation tank, microbial flocculant is added and stirred to obtain flocculated sediment and upper clear water;

[0008] (3) Bioremediation and degradation: The upper layer of clear water in step (2) is transferred into a fluidized bed reactor, a composite biosorbent is added as a carrier, and ultraviolet UV light is applied to obtain a degradation aqueous solution.

[0009] (4) Resource recycling: Green biosurfactants and corn cobs are added to the flocculation sedimentation in step (2) and bio-organic fertilizer is made by high temperature aerobic composting technology. The degradation aqueous solution described in step (3) is used to partially replace the water used in the abamectin fermentation process.

[0010] In step (1), the regulator is ammonium carbonate, which is used to adjust the pH value to 7-8.

[0011] The flocculant mentioned in step (2) is the microbial flocculant NOC-1.

[0012] Preferably, the flocculant content is 2-3‰, and the flocculation and sedimentation time is 24-48h.

[0013] The fluidized bed mentioned in step (3) is an airlift internal circulation biological aerobic fluidized bed.

[0014] The composite biosorbent mentioned in step (3) is a composite adsorbent composed of Chlorella algal carbon adsorbent and tea residue biochar, and its dosage is w. 小球藻藻碳吸附剂 :w 茶渣生物炭 =3-5:1.

[0015] In step (3), the UV lamp irradiation wavelength is 254nm, and the reaction control temperature is 28-30℃.

[0016] In step (4), the amount of green biosurfactant added is 0.1-1%, and the amount of corn cob added is 3-6%.

[0017] The green surfactant is preferably trehalose.

[0018] More specific embodiments of the present invention are as follows:

[0019] A method for the harmless treatment and resource utilization of avermectin production wastewater includes the following steps:

[0020] 1. Wastewater pretreatment unit

[0021] In the equalization tank, the pH of the avermectin wastewater is adjusted to between 7 and 8 using ammonium carbonate.

[0022] 2. Sedimentation and flocculation unit

[0023] Add 2-3‰ of microbial flocculant to the wastewater. The flocculant will continuously diffuse in the liquid. In order to ensure that the flocculant and suspended ions are in full contact, it is necessary to stir thoroughly for 20-45 minutes and then allow the flocculation and sedimentation to proceed for 24-48 hours.

[0024] 3. Bioremediation and Degradation Unit

[0025] The supernatant water after sedimentation is transferred into an airlift internal circulation biological aerobic fluidized bed reactor. A composite biosorbent is added as a carrier in the reaction zone. The temperature is controlled at 28-30℃, the residence time is 2-5h, the carrier filling rate is 40-50%, the air flow rate is 180-220L / h, the liquid flow rate is 90-120L / h, and the ultraviolet light irradiation wavelength is 254nm.

[0026] 4. Resource Recycling Unit

[0027] The final water can replace 30-60% of the water used in the abamectin fermentation process, increasing the abamectin potency by 9-14%. The flocculated sediment is treated with 0.1-1% green biosurfactant and 3-6% corn cob, and bio-organic fertilizer is produced using high-temperature aerobic composting fermentation technology.

[0028] The technical solution of the present invention has the following beneficial technical effects:

[0029] 1. Adding ammonium carbonate as a stable pH adjuster significantly improves the later stages of bioremediation. The use of bioflocculant NOC-1 can greatly improve biodegradation performance. Its synergistic effect of physical and chemical adsorption can rapidly reduce wastewater COD, color, and degrade antibiotic residues. Furthermore, it utilizes glucose and fructose in the wastewater as the optimal carbon source for microbial flocculant synthesis, significantly enhancing flocculation efficiency and effectiveness.

[0030] 2. The addition of Chlorella algae carbon adsorbent and tea residue biochar as carriers to the airlift internal circulation biological aerobic fluidized bed enhances mass transfer and provides excellent adsorption and catalytic degradation synergistic effects in the degradation of avermectin-containing organic wastewater. Its unique bioremediation characteristics are unmatched by conventional adsorbents. Furthermore, ultraviolet light irradiation rapidly oxidizes and degrades residual avermectin in the wastewater, working in conjunction with the composite bioadsorbent to completely decompose residual antibiotics. The regeneration capacity of this composite bioadsorbent also yields unexpected technical benefits in energy and environmental utilization.

[0031] 3. Wastewater treated using this technology can replace 30-60% of ordinary water in the abamectin fermentation process. Since its original nutrients are not destroyed, it is more conducive to the growth of mycelium during fermentation, which can improve the efficacy of abamectin and save on raw material costs. The microbial adsorption precipitate is added with green biosurfactants, and organic bio-fertilizer is produced using high-temperature aerobic composting fermentation technology, which accelerates the bioremediation degradation rate and extends the wastewater industrial chain and economic added value.

[0032] The use of this technology achieves the following technical requirements: This invention combines bioremediation and photodegradation technologies, utilizing an airlift-type internal circulation aerobic fluidized bed as the reaction tank and adding a composite biosorbent as a carrier, thereby realizing the harmless treatment and resource utilization of avermectin wastewater. The wastewater of this invention does not require dilution, significantly shortens the treatment cycle, simplifies the process, reduces energy consumption, facilitates on-site maintenance and management, reduces production costs and antibiotic residues in the wastewater, is safe and environmentally friendly, and significantly improves the quality of effluent. It achieves a high degree of resource recycling and utilization, ultimately achieving a chemical oxygen demand removal rate of over 98%, an avermectin removal rate of over 99%, a suspended solids removal rate of over 99%, and an avermectin potency increase of over 9% after wastewater replacement. Detailed Implementation

[0033] The avermectin wastewater in the following examples consists of avermectin fermentation broth plate and frame filter press effluent, equipment rinsing water, and a small amount of distillation water. The fermentation process is a conventional process, and the wastewater quality is as follows: COD (chemical oxygen demand): 12000-25000, SS (suspended solids): 1140-2450 mg / L, total nitrogen 470-580 mg / L, reducing sugar 2.31-2.96 mg / L, pH: 3.5-6, AVM (avermectin): 65-95 ug / L.

[0034] Example 1

[0035] The avermectin wastewater was transferred to an equalization tank, where the pH was adjusted to 7.2 using ammonium carbonate. 2.0‰ of a microbial flocculant was added to the wastewater, and after thorough stirring for 30 minutes, flocculation and sedimentation were carried out for 24 hours. The supernatant after sedimentation was transferred to an airlift internal circulation biological aerobic fluidized bed reactor, where a composite biosorbent (w) was added to the reaction zone. 小球藻藻碳吸附剂 :w 茶渣生物炭 Using a 3:1 ratio as the carrier, the temperature was controlled at 28.5℃, the residence time was 3 hours, the carrier filling rate was 50%, the gas flow rate was 190 L / h, the liquid flow rate was 110 L / h, and the UV lamp irradiation wavelength was 254 nm. 0.2% trehalose lipids and 3% corn cob were added to the flocculated precipitate, and bio-organic fertilizer was prepared using a high-temperature aerobic composting method. The final aqueous solution was used to partially replace the water used in the abamectin fermentation process. The harmless treatment effect of abamectin wastewater is shown in the table below:

[0036]

[0037] Example 2

[0038] The avermectin wastewater was transferred to an equalization tank where the pH was adjusted to 7.5 using ammonium carbonate. A microbial flocculant of 2.2‰ was added to the wastewater, and after thorough stirring for 35 minutes, flocculation and sedimentation were carried out for 32 hours. The supernatant after sedimentation was transferred to an airlift internal circulation biological aerobic fluidized bed reactor, where a composite biosorbent (w) was added to the reaction zone. 小球藻藻碳吸附剂 :w 茶渣生物炭 The ratio of chlorine to nitrogen (3.5:1) was controlled at 30.0℃, with a residence time of 2 hours, a carrier filling rate of 50%, a gas flow rate of 200 L / h, a liquid flow rate of 100 L / h, and a UV lamp irradiation wavelength of 254 nm. 0.6% trehalose lipids and 2.5% corn cob were added to the flocculated precipitate, and bio-organic fertilizer was prepared using a high-temperature aerobic composting method. The resulting aqueous solution was used to partially replace the water used in the abamectin fermentation process. The harmless treatment effect of the abamectin wastewater is shown in the table below:

[0039]

[0040] Example 3

[0041] The avermectin wastewater was transferred to an equalization tank, where the pH was adjusted to 7.1 using ammonium carbonate. A microbial flocculant of 2.4‰ was added, and the mixture was stirred thoroughly for 45 minutes before flocculation and sedimentation for 30 hours. The supernatant after sedimentation was transferred to an airlift-type internal circulation biological aerobic fluidized bed reactor, where a composite biosorbent (w) was added to the reaction zone. 小球藻藻碳吸附剂 :w 茶渣生物炭 The ratio of 4:1 was used, the temperature was controlled at 29.0℃, the residence time was 2.5h, the carrier filling rate was 50%, the gas flow rate was 180L / h, the liquid flow rate was 110L / h, and the UV lamp irradiation wavelength was 254nm. 0.5% trehalose lipids and 2.8% corn cob were added to the flocculated precipitate, and bio-organic fertilizer was prepared using a high-temperature aerobic composting method. The final aqueous solution was used to partially replace the water used in the abamectin fermentation process. The harmless treatment effect of abamectin wastewater is shown in the table below:

[0042]

[0043] Example 4

[0044] The avermectin wastewater was transferred to an equalization tank, where the pH was adjusted to 7.4 using ammonium carbonate. Microbial flocculant (3.0‰) was added to the wastewater, and after thorough stirring for 45 minutes, flocculation and sedimentation were carried out for 31 hours. The supernatant after sedimentation was transferred to an airlift internal circulation biological aerobic fluidized bed reactor, where a composite biosorbent (w...) was added. 小球藻藻碳吸附剂 :w 茶渣生物炭The ratio of 5:1 was used, the temperature was controlled at 28.0℃, the residence time was 3.5h, the carrier filling rate was 50%, the gas flow rate was 210L / h, the liquid flow rate was 90L / h, and the UV lamp irradiation wavelength was 254nm. 0.7% trehalose lipids and 3.2% corn cob were added to the flocculated precipitate, and bio-organic fertilizer was prepared using a high-temperature aerobic composting method. The final aqueous solution was used to partially replace the water used in the abamectin fermentation process. The harmless treatment effect of abamectin wastewater is shown in the table below:

[0045]

[0046] Comparative Example 1

[0047] The pH of the avermectin wastewater was adjusted to 7.3 in the equalization tank using ammonium carbonate. Microbial flocculant at 3.0‰ was added, and after thorough stirring for 45 minutes, flocculation and sedimentation were carried out for 31 hours. The supernatant after sedimentation was transferred to an airlift internal circulation biological aerobic fluidized bed reactor. Activated carbon was added as a carrier in the reaction zone, and the temperature was controlled at 28.9℃, the residence time at 3.7 hours, the carrier filling rate at 50%, the air flow rate at 210 L / h, the liquid flow rate at 90 L / h, and direct UV irradiation at a wavelength of 254 nm. Alginate (0.3%) and corn cob (3.4%) were added to the flocculated sediment, and bio-organic fertilizer was prepared using a high-temperature aerobic composting method. The harmless treatment effect of the avermectin wastewater is shown in the table below.

[0048]

[0049] Comparative Example 2

[0050] The avermectin wastewater was transferred to an equalization tank, where the pH was adjusted to 9.2 using sodium hydroxide. A 20% ferrous sulfate solution was added as a flocculant, and the mixture was stirred thoroughly for 45 minutes, followed by flocculation and sedimentation for 31 hours. The supernatant after sedimentation was transferred to an airlift internal circulation biological aerobic fluidized bed reactor, where a composite biosorbent (w) was added to the reaction zone. 小球藻藻碳吸附剂 :w 茶渣生物炭 =3.5:1), temperature controlled at 29.0℃, residence time 4.5h, carrier filling rate 50%, gas flow rate 210L / h, liquid flow rate 90L / h, UV lamp irradiation wavelength 254nm. 0.6% trehalose and 3.9% corn cob were added to the flocculated precipitate. Because the organic matter content was <40%, bio-organic fertilizer could not be produced. The harmless treatment effect of abamectin wastewater is shown in the table below:

[0051]

[0052] Comparative Example 3

[0053] The pH of the avermectin wastewater was adjusted to 7.3 using ammonium carbonate in the equalization tank. Microbial flocculant (3.0‰) was added to the wastewater, and after thorough stirring for 45 minutes, flocculation and sedimentation were carried out for 31 hours. The supernatant after sedimentation was transferred to an airlift internal circulation biological aerobic fluidized bed reactor, where a composite adsorbent (w...) was added. 小球藻藻碳吸附剂 :w 茶渣生物炭 Using a 3:1 ratio as the carrier, the temperature was controlled at 29.0℃, the residence time was 3.0h, the carrier filling rate was 50%, the gas flow rate was 200L / h, and the liquid flow rate was 95L / h. 0.4% trehalose and 3.1% corn cob were added to the flocculated sediment, and bio-organic fertilizer was produced using a high-temperature aerobic composting method. The harmless treatment effect of abamectin wastewater is shown in the table below:

[0054]

[0055] Comparative Example 4

[0056] The avermectin wastewater was transferred to an equalization tank where the pH was adjusted to 7.3 using ammonium carbonate. Microbial flocculant at 3.5‰ was added, and the mixture was stirred thoroughly for 43 minutes before flocculation and sedimentation for 37 hours. The supernatant after sedimentation was transferred to an airlift-type internal circulation biological aerobic fluidized bed reactor. Chlorella algae carbon adsorbent was added to the reaction zone as a carrier, with a filling rate of 50%. The temperature was controlled at 28.5℃, the residence time at 3.5 hours, the air flow rate at 210 L / h, the liquid flow rate at 90 L / h, and the UV lamp irradiation wavelength at 254 nm. Alginate (0.5%) and corn cob (3.2%) were added to the flocculated sediment, and bio-organic fertilizer was prepared using a high-temperature aerobic composting method. The harmless treatment effect of the avermectin wastewater is shown in the table below.

[0057]

[0058] Comparative Example 5

[0059] The avermectin wastewater was transferred to an equalization tank, where the pH was adjusted to 7.2 using ammonium carbonate. Microbial flocculant at 3.3‰ was added, and the mixture was stirred thoroughly for 48 minutes before flocculation and sedimentation for 40 hours. The supernatant after sedimentation was transferred to an airlift-type internal circulation biological aerobic fluidized bed reactor. Tea residue biochar was added as a carrier, with a filling rate of 50%. The temperature was controlled at 29.5℃, the retention time at 4.0 hours, the air flow rate at 210 L / h, the liquid flow rate at 90 L / h, and the UV lamp irradiation wavelength at 254 nm. Alginate (0.6%) and corn cob (3.8%) were added to the flocculated sediment, and bio-organic fertilizer was prepared using a high-temperature aerobic composting method. The harmless treatment effect of the avermectin wastewater is shown in the table below.

[0060]

Claims

1. A method for the harmless treatment and resource utilization of avermectin production wastewater, comprising the following steps: (1) Wastewater pretreatment: The abamectin wastewater is transferred to the equalization tank and the pH value is adjusted by the regulator; the regulator mentioned in step (1) is ammonium carbonate, and the pH value is adjusted to 7-8; (2) Sedimentation and flocculation: The wastewater after pH adjustment in step (1) is transferred to a sedimentation tank, microbial flocculant is added and stirred to obtain flocculated sediment and upper clear water; (3) Bioremediation and Degradation: The upper layer of clear water from step (2) is transferred to a fluidized bed reactor, where a composite biosorbent is added as a carrier, and then irradiated with ultraviolet (UV) light to obtain a degradation aqueous solution; the composite biosorbent mentioned in step (3) is a composite adsorbent composed of Chlorella algal carbon adsorbent and tea residue biochar; the amount of the composite adsorbent used is w 小球藻藻碳吸附剂 :w 茶渣生物炭 =3-5:1; (4) Resource recycling: Green biosurfactant and corn cob are added to the flocculation sedimentation in step (2) and bio-organic fertilizer is made by high temperature aerobic composting technology. The degradation aqueous solution in step (3) is used to partially replace the water in the abamectin fermentation process. The green biosurfactant in step (4) is trehalose.

2. The method for harmless treatment and resource utilization of avermectin production wastewater according to claim 1, characterized in that... The flocculant mentioned in step (2) is the microbial flocculant NOC-1.

3. The method for harmless treatment and resource utilization of avermectin production wastewater according to claim 2, characterized in that... The flocculant dosage is 2-3‰, and the flocculation and sedimentation time is 24-48h.

4. The method for harmless treatment and resource utilization of avermectin production wastewater according to claim 1, characterized in that... The fluidized bed mentioned in step (3) is an airlift internal circulation biological aerobic fluidized bed.

5. The method for harmless treatment and resource utilization of avermectin production wastewater according to claim 1, characterized in that... In step (3), the UV lamp irradiation wavelength is 254nm, and the reaction control temperature is 28-30℃.

6. The method for harmless treatment and resource utilization of avermectin production wastewater according to claim 1, characterized in that... The green biosurfactant mentioned in step (4) is trehalose lipid, and the addition amount is 0.1-1‰, while the addition amount of corn cob is 3-6%.

Images