ZVI packed bed A / O treatment device for efficiently removing antibiotics and ARG in swine wastewater

Abstract

The utility model discloses a ZVI packed bed A / O treatment device for efficiently removing antibiotics and ARG in pig raising wastewater, relates to the technical field of pig farm wastewater treatment, and solves the problems that the existing livestock and poultry farm wastewater treatment method is poorer in removal effect on antibiotics and resistance genes thereof, long in process flow and high in cost. The device comprises a water inlet tank, a reactor main body, an aeration device and a water outlet tank, the water inlet tank, the reactor main body and the water outlet tank are sequentially communicated, and the aeration device is arranged on the reactor main body; the reactor main body comprises a plurality of anaerobic chambers, a plurality of aerobic chambers and an effluent overflow pool, the anaerobic chambers, the aerobic chambers and the effluent overflow pool are sequentially communicated, the water inlet tank is communicated with the first anaerobic chamber, and the aeration device is communicated with the aerobic chambers; the effluent overflow pool is communicated with the first anaerobic chamber through a reflux pump; and packed beds are arranged in the anaerobic chamber and the aerobic chamber. According to the utility model, through mediation of zero-valent iron, effective removal of antibiotics and resistance genes thereof is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of pig farm wastewater treatment, in particular to a ZVI packing bed A / O treatment device for efficiently removing antibiotics and ARG in pig farm wastewater. Background Art

[0002] The intensive development of livestock and poultry farming has led to the massive concentrated discharge of livestock and poultry wastewater. The antibiotics and their resistance gene pollution will have a wide and far-reaching impact on urban and rural water resources and the water environment, endangering ecological security and human health. It is a major problem that needs to be urgently solved in my country's ecological civilization construction. The large amount of antibiotics and antibiotic resistance genes (ARG) contained in livestock and poultry wastewater will also cause serious public health problems. Statistics show that 80,000 people die directly or indirectly in my country each year due to the abuse of antibiotics, and the WHO predicts that by 2050, antibiotic resistance will cause 1 million premature deaths in my country each year and will cause economic losses of 20 trillion US dollars. However, the current large-scale livestock and poultry farm wastewater treatment technology mainly focuses on COD and NH4 + The purpose of the process is to remove -N, and there are generally prominent problems such as long process flow, complex operation and management, poor biological nitrogen and phosphorus removal effects, and failure to consider the removal of antibiotics and their resistance genes. Therefore, while further tightening the emission standards for plant nutrients such as carbon, nitrogen, and phosphorus, how to effectively remove antibiotics and their resistance genes from livestock and poultry farm wastewater has become a common problem that needs to be solved in the protection of urban and rural water resources and water environment.

[0003] For the removal of antibiotics and their resistance genes in wastewater, the commonly used methods are currently advanced oxidation treatment, biological treatment and ecological treatment. Among them, advanced oxidation treatment is mainly based on photocatalysis, ozone oxidation, Fenton method and electrochemical oxidation method. It is a powerful technical measure to remove refractory organic pollutants. It is generally used for primary treatment of organic wastewater or deep treatment of secondary treatment effluent; ecological treatment process represented by artificial wetlands is a relatively environmentally friendly and efficient method for treating veterinary antibiotics in livestock and poultry breeding wastewater. Due to the constraints of tightening land resources, its promotion and application are greatly limited. Biological treatment process can remove conventional pollutants (carbon, nitrogen and phosphorus) through biological adsorption and biodegradation, and is easy to control and stable in operation, with low treatment cost and less environmental impact. It is widely used in organic wastewater treatment. However, the existing wastewater biological treatment facilities in livestock and poultry farms have poor removal effects on antibiotics and their resistance genes. In addition, the previous biological treatment to remove antibiotics requires a long hydraulic retention time and a high operating temperature, which increases the cost. Therefore, it is urgent to develop efficient removal technology for antibiotics and their resistance genes in pig farm wastewater.

[0004] Therefore, there is an urgent need to provide a device and method that can effectively remove antibiotics and their resistance genes in pig farm wastewater to solve the above problems. Utility Model Content

[0005] In order to solve the above-mentioned problems of poor removal effect of antibiotics and their resistance genes in the existing livestock and poultry farm wastewater treatment methods, long process flow and high cost, the utility model proposes a ZVI packed bed A / O treatment device for efficient removal of antibiotics and ARG in pig wastewater. The utility model achieves effective removal of antibiotics and their resistance genes through the mediation of zero-valent iron (ZVI).

[0006] The utility model proposes a ZVI packing bed A / O treatment device for efficiently removing antibiotics and ARG in piggery wastewater. The device comprises a water inlet box, a reactor body, an aeration device and a water outlet box. The water inlet box, the reactor body and the water outlet box are connected in sequence, and the aeration device is arranged on the reactor body; the reactor body comprises a plurality of anaerobic chambers, a plurality of aerobic chambers and a water outlet overflow tank, the plurality of anaerobic chambers, a plurality of aerobic chambers and a water outlet overflow tank are connected in sequence, the water inlet box is connected to the first anaerobic chamber, and the aeration device is connected to the plurality of aerobic chambers; the water outlet overflow tank is connected to the first anaerobic chamber through a reflux pump; and packing beds are arranged in the anaerobic chamber and the aerobic chamber.

[0007] Furthermore, the anaerobic chamber and the aerobic chamber are both provided with baffles, and the inner parts of the anaerobic chamber and the aerobic chamber are divided into a diversion channel and a main reaction zone by the baffles, and a packing bed is provided in the main reaction zone; the anaerobic chamber includes an anaerobic chamber 1, and the interior of the anaerobic chamber 1 is divided into an anaerobic chamber 1 diversion channel and an anaerobic chamber 1 main reaction zone by the baffles, and the anaerobic chamber 1 diversion channel is connected to the water inlet tank and the effluent overflow tank respectively; the aerobic chamber includes an aerobic chamber 2, and the interior of the aerobic chamber 2 is divided into an aerobic chamber 2 diversion channel and an aerobic chamber 2 main reaction zone by the baffles, and the aerobic chamber 2 main reaction zone is connected to the effluent overflow tank.

[0008] Furthermore, the volume ratio between the diversion channel and the main reaction zone is 1:10.

[0009] Furthermore, the aeration device includes an air pump, and the air pump is connected to the main reaction zone of the aerobic chamber.

[0010] Furthermore, the fillers inside the packed bed include a plurality of zero-valent iron and a plurality of hollow ring fillers.

[0011] Furthermore, the zero-valent iron includes a plurality of iron filings, each of which has a length of 0.1 mm to 2 mm, a width of 0.1 mm to 2 mm, and a thickness of 0.01 mm to 0.1 mm.

[0012] Furthermore, the hollow ring filler is divided into 6 fan-shaped holes, and the surface is provided with 24 edges, with a diameter of 15 mm, a length of 10 mm, and a specific surface area of ​​700-800 m 2 / m 3 .

[0013] Furthermore, the ZVI packed bed A / O treatment device for efficiently removing antibiotics and ARG in pig wastewater has a length of 50 cm, a width of 10 cm, and a height of 60 cm.

[0014] The beneficial effects of the ZVI packed bed A / O treatment device for efficiently removing antibiotics and ARG in piggery wastewater described in the utility model are:

[0015] (1) The utility model discloses a ZVI packed bed A / O treatment device for efficiently removing antibiotics and ARGs from pig farm wastewater. The device aims to solve the common problems of poor removal of antibiotics and their resistance genes in existing pig farm wastewater biological treatment technologies, long process flow, and high treatment costs. The device proposes a technical solution for efficiently removing antibiotics and their resistance genes by using a packed bed A / O integrated reactor strengthened with cheap zero-valent iron. Zero-valent iron is cheap, readily available, and has strong reducing properties. It stimulates the growth and metabolic activity of the functional bacteria for biological denitrification and phosphorus removal in wastewater through redox and adsorption co-precipitation mechanisms, thereby enhancing the efficiency of biological denitrification and phosphorus removal in wastewater. Through low-dose ZVI mediation, the device effectively enhances the degradation and removal of toxic and harmful difficult-to-degrade organic matter such as antibiotics and their resistance genes by the biological treatment system. The total removal rate of tetracyclines, quinolones, and sulfonamides in pig farm wastewater is greater than 91%, and no external carbon source and alkalinity are required, thereby saving operating costs.

[0016] (2) The ZVI packed bed A / O treatment device for efficiently removing antibiotics and ARGs in pig wastewater described in the utility model has a zero-valent iron packed bed that not only serves as a filler for microbial attachment and growth, but also provides an interface required for microbial biofilm formation, thereby maintaining the biomass in the treatment device. At the same time, zero-valent iron, as a cheap and readily available substance with redox activity, can promote microbial metabolic activity by stimulating microbial enzyme activity, thereby improving the biodegradability of pollutants such as antibiotics in the reactor;

[0017] (3) The ZVI packed bed A / O treatment device for efficiently removing antibiotics and ARGs from piggery wastewater described in the utility model transports the treated wastewater in the effluent overflow tank to the anaerobic chamber for further treatment through a reflux pump, thereby enhancing the removal effect of antibiotics and resistance genes in the wastewater;

[0018] (4) The ZVI packed bed A / O treatment device for efficiently removing antibiotics and ARG in pig wastewater described in the utility model can achieve efficient and simultaneous removal of carbon, nitrogen, phosphorus, antibiotics and their resistance genes, with a short process flow, low engineering investment, good treatment effect and low operating cost. It can provide new ideas and technical support for the upgrading and transformation of existing industrial wastewater and municipal sewage treatment systems, and has good market competitiveness and broad prospects for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and the description thereof are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0020] In the attached picture:

[0021] Figure 1 It is a structural schematic diagram of a ZVI packed bed A / O treatment device for efficiently removing antibiotics and ARG in piggery wastewater according to the utility model;

[0022] Figure 2 It is a schematic structural diagram of a ZVI packed bed A / O treatment device for efficiently removing antibiotics and ARG in piggery wastewater described in the utility model, in which the anaerobic chamber and the aerobic chamber are divided by baffles;

[0023] Figure 3 It is a schematic structural diagram of a hollow annular packing of a ZVI packing bed A / O treatment device for efficiently removing antibiotics and ARG in piggery wastewater described in the utility model;

[0024] Figure 4 It is a top view of a hollow annular packing of a ZVI packing bed A / O treatment device for efficiently removing antibiotics and ARG in piggery wastewater described in the utility model;

[0025] Wherein: 1-water inlet tank, 2-water inlet pump, 3-anaerobic chamber 1, 31-anaerobic chamber 1 diversion channel, 32-anaerobic chamber 1 main reaction zone, 4-anaerobic chamber 2, 41-anaerobic chamber 2 diversion channel, 42-anaerobic chamber 2 main reaction zone, 5-aerobic chamber 1, 51-aerobic chamber 1 diversion channel, 52-aerobic chamber 1 main reaction zone, 6-aerobic chamber 2, 61-aerobic chamber 2 diversion channel, 62-aerobic chamber 2 main reaction zone, 7-air pump, 8-water outlet overflow tank, 9-reflux pump, 10-water outlet tank, 11-baffle, 12-packing bed, 13-hollow ring packing. DETAILED DESCRIPTION

[0026] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings:

[0027] Specific implementation method 1: See Figure 1-Figure 4The present embodiment is described in detail. The ZVI packed bed A / O treatment device for efficient removal of antibiotics and ARG in pig wastewater described in the present embodiment specifically comprises an inlet tank 1, a reactor body, an aeration device and an outlet tank 10. The inlet tank 1, the reactor body and the outlet tank 10 are connected in sequence, and an aeration device is provided on the reactor body; the reactor body comprises a plurality of anaerobic chambers, a plurality of aerobic chambers and an outlet overflow tank 8, and a plurality of anaerobic chambers, a plurality of aerobic chambers and an outlet overflow tank 8 are connected in sequence, the inlet tank 1 is connected to the first anaerobic chamber, part of the outlet water flows back to the first anaerobic chamber, and the aeration device is connected to a plurality of aerobic chambers; the outlet overflow tank 8 is connected to the first anaerobic chamber through a reflux pump 9; and a packed bed 12 is provided in the anaerobic chamber and the aerobic chamber. An inlet pump 2 is provided between the inlet tank 1 and the reactor body.

[0028] The anaerobic chamber and the aerobic chamber are both provided with baffles 11, and the inner part of the anaerobic chamber and the aerobic chamber is divided into a diversion channel and a main reaction zone by the baffles 11. A packing bed 12 is provided in the main reaction zone, and the volume ratio between the diversion channel and the main reaction zone is 1:10; Figure 2 As shown, the anaerobic chamber includes an anaerobic chamber 1 3 and an anaerobic chamber 2 4. The interior of the anaerobic chamber 1 3 is divided into an anaerobic chamber 1 diversion channel 31 and an anaerobic chamber 1 main reaction zone 32 by a baffle 11. The interior of the anaerobic chamber 2 4 is divided into an anaerobic chamber 1 diversion channel 41 and an anaerobic chamber 1 main reaction zone 42 by a baffle 11. The water inlet tank 1 and the water outlet overflow tank 8 are both connected to the anaerobic chamber 1 diversion channel 31 through a pipeline; the aerobic chamber includes an aerobic chamber 1 5 and an aerobic chamber 2 6. The interior of the aerobic chamber 1 5 is divided into an aerobic chamber 1 diversion channel 51 and The aerobic chamber 1 main reaction zone 52 and the interior of the aerobic chamber 2 6 are divided into an aerobic chamber 2 diversion channel 61 and an aerobic chamber 2 main reaction zone 62 by a baffle 11; the anaerobic chamber 1 diversion channel 31, the anaerobic chamber 1 main reaction zone 32, the anaerobic chamber 2 diversion channel 41, the anaerobic chamber 2 main reaction zone 42, the aerobic chamber 1 diversion channel 51, the aerobic chamber 1 main reaction zone 52, the aerobic chamber 2 diversion channel 61, the aerobic chamber 2 main reaction zone 62 and the effluent overflow pool 8 are connected in sequence, and the ratio of the effluent return flow of the effluent overflow pool 8 to its influent flow is 2.

[0029] The aeration device includes an air pump 7, which is connected to the aerobic chamber first main reaction zone 52 and the aerobic chamber second main reaction zone 62 through an air pipe to supply air to the inside thereof.

[0030] The packing inside the packing bed 12 includes a plurality of zero-valent iron and a plurality of hollow ring packings 13; the packing bed 12 has a height of 20 cm and a stacking void ratio of 98%.

[0031] The zero-valent iron is composed of a number of iron filings; the length of the iron filings is 0.1 mm to 2 mm, the width is 0.1 mm to 2 mm, and the thickness is 0.01 mm to 0.1 mm.

[0032] The hollow ring filler 13 is made of polyvinyl chloride, and its interior is equally divided into 6 sector-shaped holes, and its surface is provided with 24 edges. Figure 3 and Figure 4 As shown; the hollow ring filler 13 has a diameter of 15 mm, a length of 10 mm, and a specific surface area of ​​700 to 800 m 2 / m 3 .

[0033] The ZVI packed bed A / O treatment device for efficiently removing antibiotics and ARG in piggery wastewater has a length of 50 cm, a width of 10 cm, a height of 60 cm, and an effective volume of 24 L.

[0034] The specific working process of the ZVI packed bed A / O treatment device for efficiently removing antibiotics and ARG in pig wastewater described in the utility model is explained as follows:

[0035] During operation, the wastewater in the water inlet tank 1 is sent to the anaerobic chamber 1 3 of the reactor body through the water inlet pump 2. The wastewater flows up and down in the anaerobic chamber 1 3, the anaerobic chamber 2 4, the aerobic chamber 1 5 and the aerobic chamber 2 6 in an overall push flow manner. When passing through the packing bed 12, the antibiotics and resistance genes in the wastewater are removed under the action of zero-valent iron. The treated wastewater enters the effluent overflow tank 8, and the nitrification liquid reflux ratio of the effluent overflow tank 8 is controlled to be 2:1. Part of the wastewater is returned to the anaerobic chamber 1 diversion channel 31 for further treatment, and the other part of the wastewater is directly discharged into the water outlet tank 10.

[0036] A control reactor was constructed, which was a traditional packed bed A / O integrated reactor; the experimental reactor was a zero-valent iron packed bed A / O integrated reactor.

[0037] Initially, 3.6 g / L zero-valent iron (purity above 98%) is placed in the packing bed 12. The zero-valent iron is pre-washed three times with diluted hydrochloric acid before use.

[0038] The pig farm wastewater in the water inlet tank is sent to the anaerobic chamber-diversion channel 31 through the water inlet pump 2. The pig farm wastewater reacts in the zero-valent iron filler bed A / O integrated treatment system, and the nitrification liquid reflux ratio of the effluent overflow tank 8 is controlled to be 2:1. Finally, the treated water is discharged through the outlet of the effluent overflow tank 8. The dissolved oxygen concentration in the aerobic chamber is maintained at 2.5 mg / L. During the 120 days of operation of the reactor system, the temperature is 25±1°C, the reflux ratio is 2.0, and the hydraulic retention time is 36 hours. The pH of the pig farm wastewater is 7.71-8.24.

[0039] In this example, the sludge from the secondary sedimentation tank of the sewage treatment plant was used as the inoculated sludge. The experimental water was taken from the pig farm wastewater of a dry manure-cleaning pig farm in Harbin. The pig farm wastewater used in the process operation had the following water quality: COD: 154.9-780.2 mg / L; NH4 +-N: 233.5-491.2mg / L; TN: 322.4-632.0mg / L, TP: 15.1-30.8mg / L. The total concentration of 12 antibiotics in pig farm wastewater was 80.8-208.6μg / L. Among them, the concentration of tetracycline antibiotics was 57.8-141.3μg / L, the concentration of quinolone antibiotics was 17.0-55.0μg / L, and the concentration of sulfonamide antibiotics was 3.3-20.9μg / L. The concentrations of antibiotic-resistant bacteria SMX, NOR and CTC in pig wastewater were 2.02×10 6 CFU / mL, 1.07×10 4 CFU / mL and 2.18×10 3 CFU / mL. The content of 10 common antibiotic resistance genes (ARGs) in pig wastewater was 6.78×10 6 copies / mL, and the total amount of two mobile genetic elements (MGEs) was 2.48×10 5 copies / mL.

[0040] There are 12 kinds of antibiotics in pig farm wastewater, including 4 tetracycline antibiotics, 4 sulfonamide antibiotics and 4 quinolone antibiotics.

[0041] The four tetracycline antibiotics include tetracycline, oxytetracycline, chlortetracycline and doxycycline; the four sulfonamide antibiotics include sulfadiazine, sulfamethoxazole, sulfamethoxazole and sulfamethoxazole; the four quinolone antibiotics include enrofloxacin, ciprofloxacin, norfloxacin and ofloxacin.

[0042] Antibiotic-resistant bacteria in pig wastewater include: SMX-resistant bacteria, NOR-resistant bacteria and CTC-resistant bacteria;

[0043] There are 10 common resistance genes (ARGs) and 2 mobile genetic elements (MGEs) in pig farm wastewater; the 10 common resistance genes include: tetA, tetG, tetO, tetW, tetX, qnrD, qnrS, aac(6′)-Ib-cr, sul1 and sul2; the 2 mobile genetic elements include: intI1 and intI2

[0044] Treatment effect of this implementation method: During the stable period of process operation, COD, NH4 +The average removal efficiencies of -N, TN and TP were 93.4±1.3%, 99.8±0.3%, 95.6±2.1% and 83.7±2.2%, respectively. The residual concentrations in the effluent were 26.1±5.0, 0.9±1.1, 19.9±3.9 and 3.3±0.6 mg / L, respectively. The effluent concentrations of various pollutants were better than the limit values ​​required by the Pollutant Emission Standard for Livestock and Poultry Breeding (GB18596-2001). Compared with the control reactor, the COD and NH4 + -N, TN and TP concentrations decreased by 25.4±18.9%, 96.1±4.3%, 59.6±6.7% and 76.2±3.4%, respectively.

[0045] During the long-term operation of the reactor in this implementation case, 4 tetracycline antibiotics, 4 quinolone antibiotics and 4 sulfonamide antibiotics in the reactor inlet and outlet water were detected and analyzed every 10 days. The total antibiotic removal rate reached 91.2±3.2%, which was 34.9% higher than the total antibiotic removal rate of the control reactor. The removal rates of sulfonamide, tetracycline and quinolone antibiotics were 100%, 92.2±4.1% and 85.7±2.4%, respectively. Compared with the control reactor, the removal rates of sulfonamide, tetracycline and quinolone antibiotics were increased by 10.0%, 35.0% and 43.9%, respectively. It can be seen that the zero-valent iron packed bed A / O integrated treatment device and method for efficient removal of antibiotics and their resistance genes in pig farm wastewater of the present invention can well remove sulfonamide, tetracycline and quinolone antibiotics in pig farm wastewater, and the removal effect is relatively stable.

[0046] During the stable operation period, 4 tetracycline antibiotics, 4 quinolone antibiotics and 4 sulfonamide antibiotics in the reactor activated sludge were detected and analyzed. Compared with the control reactor, the total antibiotic concentration in the activated sludge of the experimental reactor was reduced by 57.58±19.99%. Among them, the cumulative amounts of tetracyclines, quinolones and sulfonamide antibiotics decreased by 73.28±2.09%, 37.90±4.80% and 35.01±21.23%, respectively. It can be seen that the pig farm wastewater treatment device and method for enhancing antibiotic removal with zero-valent iron of the present invention can further reduce the antibiotics in the activated sludge and achieve the effect of thorough removal of antibiotics.

[0047] During the stable operation period, the main mechanism of antibiotic removal in the reactor was biodegradation, which contributed about 79.16%. In addition, sludge adsorption was about 11.09%, and zero-valent iron adsorption was about 1.15%. Compared with the control reactor, the biodegradation capacity of the reactor to remove antibiotics increased by 44.77%. It can be seen that the zero-valent iron packed bed A / O integrated treatment device for efficient removal of antibiotics and their resistance genes in pig wastewater of the present invention mainly enhances the removal of antibiotics by improving biodegradation.

[0048] Antibiotic-resistant bacteria (ARB), antibiotic resistance genes (ARGs) and mobile genetic elements (MGEs) were removed by 0.69-1.74, 2.06 and 2.15 logs, respectively. Compared with the control reactor, the removal efficiency of ARB, ARGs and MGEs increased by 0.03-0.52, 1.74 and 2.34 logs, respectively. The zero-valent iron packed bed A / O integrated treatment device for efficient removal of antibiotics and their resistance genes in pig wastewater also changed the composition of the microbial community and reduced the potential hosts of ARGs.

[0049] The ZVI packed bed A / O treatment device for efficiently removing antibiotics and ARG in piggery wastewater described in the utility model controls the dissolved oxygen, temperature and other conditions in the aerobic chamber so that the fixed packed bed in the aerobic chamber mainly undergoes partial ammonia oxidation-anaerobic ammonia oxidation (PN / A) reaction, thereby no external carbon source is required. In engineering applications, no complicated external carbon source dosing device is required, thus saving engineering investment and operating costs.

[0050] Summarizing the above implementation cases, the utility model discloses a ZVI packed bed A / O treatment device for efficiently removing antibiotics and ARGs in piggery wastewater. Aiming at the common problems of poor removal of antibiotics and their resistance genes in existing piggery wastewater biological treatment technologies, long process flow, and high treatment costs, a technical solution is proposed for efficiently removing antibiotics and their resistance genes by using cheap zero-valent iron to strengthen the packed bed A / O integrated reactor. Zero-valent iron is cheap, easily available, and has strong reducing properties. It stimulates the growth and metabolic activity of the functional bacteria for biological denitrification and phosphorus removal in wastewater through redox and adsorption co-precipitation mechanisms, thereby enhancing the efficiency of biological denitrification and phosphorus removal in wastewater. Through low-dose ZVI mediation, it effectively enhances the degradation and removal of toxic and harmful difficult-to-degrade organic matter such as antibiotics and their resistance genes by the biological treatment system. The total removal rate of tetracyclines, quinolones, and sulfonamides in piggery wastewater is greater than 91%, and no external carbon source and alkalinity are required, thereby saving operating costs. The utility model discloses a ZVI packed bed A / O treatment device for efficiently removing antibiotics and ARGs in piggery wastewater. The packing filled with zero-valent iron is provided. The material bed 12 not only serves as a filler for the attachment and growth of microorganisms, but also provides an interface required for the formation of biofilms for microorganisms, thereby maintaining the biomass in the treatment device. At the same time, zero-valent iron, as a cheap and readily available substance with redox activity, can promote the metabolic activity of microorganisms by stimulating the activity of microbial enzymes, thereby improving the biodegradation capacity of pollutants such as antibiotics in the reactor; the ZVI filler bed A / O treatment device for efficiently removing antibiotics and ARG in piggery wastewater described in the utility model transports the treated wastewater in the effluent overflow tank 8 to the anaerobic chamber for further treatment through the provided reflux pump 9, thereby enhancing the removal effect of antibiotics and resistance genes in the wastewater; the ZVI filler bed A / O treatment device for efficiently removing antibiotics and ARG in piggery wastewater described in the utility model can realize the efficient and simultaneous removal of carbon, nitrogen, phosphorus, antibiotics and their resistance genes, with a short process flow, low engineering investment, good treatment effect and low operating cost, and can provide new ideas and technical support for the upgrading and transformation of existing industrial wastewater and municipal sewage treatment systems, and has good market competitiveness and broad prospects for promotion and application.

[0051] The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only a specific embodiment of the utility model and is not intended to limit the utility model. It can also be a reasonable combination of the features recorded in the above implementation methods. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A ZVI packed bed A / O treatment device for efficient removal of antibiotics and ARG in piggery wastewater, characterized by: The reactor comprises a water inlet tank (1), a reactor body, an aeration device and a water outlet tank (10). The water inlet tank (1), the reactor body and the water outlet tank (10) are connected in sequence, and the reactor body is provided with an aeration device. The reactor body comprises a plurality of anaerobic chambers, a plurality of aerobic chambers and a water outlet overflow tank (8). The plurality of anaerobic chambers, a plurality of aerobic chambers and the water outlet overflow tank (8) are connected in sequence. The water inlet tank (1) is connected to the first anaerobic chamber, and the aeration device is connected to the plurality of aerobic chambers. The water outlet overflow tank (8) is connected to the first anaerobic chamber via a reflux pump (9). A packing bed (12) is provided in the anaerobic chamber and the aerobic chamber.

2. The ZVI packed bed A / O treatment device for efficient removal of antibiotics and ARG in piggery wastewater according to claim 1, characterized in that: The anaerobic chamber and the aerobic chamber are both provided with baffles (11), and the inner parts of the anaerobic chamber and the aerobic chamber are divided into a diversion channel and a main reaction zone by the baffles (11), and a packing bed (12) is provided in the main reaction zone; the anaerobic chamber comprises an anaerobic chamber 1 (3), and the interior of the anaerobic chamber 1 (3) is divided into an anaerobic chamber 1 diversion channel (31) and an anaerobic chamber 1 main reaction zone (32) by the baffles (11), and the anaerobic chamber 1 diversion channel (31) is respectively connected to the water inlet tank (1) and the effluent overflow pool (8); the aerobic chamber comprises an aerobic chamber 2 (6), and the interior of the aerobic chamber 2 (6) is divided into an aerobic chamber 2 diversion channel (61) and an aerobic chamber 2 main reaction zone (62) by the baffles (11), and the aerobic chamber 2 main reaction zone (62) is connected to the effluent overflow pool (8).

3. The ZVI packed bed A / O treatment device for efficient removal of antibiotics and ARG in piggery wastewater according to claim 2, characterized in that: The volume ratio between the diversion channel and the main reaction zone is 1:

10.

4. The ZVI packed bed A / O treatment device for efficient removal of antibiotics and ARG in piggery wastewater according to claim 2 or 3, characterized in that: The aeration device comprises an air pump (7), and the air pump (7) is connected to the main reaction zone of the aerobic chamber.

5. The ZVI packed bed A / O treatment device for efficiently removing antibiotics and ARG in piggery wastewater according to claim 1 or 2, characterized in that: The internal filler of the filler bed (12) includes a plurality of zero-valent iron and a plurality of hollow ring fillers.

6. The ZVI packed bed A / O treatment device for efficient removal of antibiotics and ARG in piggery wastewater according to claim 5, characterized in that: The hollow ring filler (13) is divided into 6 equally spaced sector holes, and has 24 edges on its surface. The diameter is 15 mm, the length is 10 mm, and the specific surface area is 700-800 m 2 / m 3 .

7. The ZVI packed bed A / O treatment device for efficient removal of antibiotics and ARG in piggery wastewater according to claim 1, characterized in that: The ZVI packed bed A / O treatment device for efficiently removing antibiotics and ARG in piggery wastewater has a length of 50 cm, a width of 10 cm, and a height of 60 cm.

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