System and method for synchronous carbon and nitrogen removal and antibiotic degradation detoxification of landfill leachate

Abstract

The invention discloses a system and a method for synchronous carbon and nitrogen removal and antibiotic degradation detoxification of landfill leachate. The method comprises the following steps: acquiring activated sludge enriched with autotrophic denitrifying bacteria, heterotrophic denitrifying bacteria and sulfate reducing bacteria; the method comprises the following steps: inoculating activated sludge enriched with autotrophic denitrifying bacteria, heterotrophic denitrifying bacteria and sulfate reducing bacteria into a UASB reactor according to an equal proportion so as to enrich heterotrophic denitrifying bacteria, sulfur oxidation autotrophic denitrifying bacteria and sulfate reducing bacteria, taking simulated landfill leachate as UASB inlet water, and adding stream loan sulfate into the UASB inlet water, so as to enrich the heterotrophic denitrifying bacteria, sulfur oxidation autotrophic denitrifying bacteria and sulfate reducing bacteria. Maintaining the UASB reactor to run for a preset time; the landfill leachate to be treated is added into the UASB reactor which runs for a preset time. The system and the method can be used for synchronously removing carbon and nitrogen and degrading and detoxifying antibiotics for the landfill leachate.

Description

Technical Field

[0001] The invention belongs to the technical field of wastewater treatment, and relates to a system and method for simultaneous carbon removal, denitrification and antibiotic degradation and detoxification of landfill leachate. Background Art

[0002] Antibiotics, as a representative emerging pollutant, are reported to be often present in landfill leachate. With the large-scale production and use of antibiotics in recent years, the concentration of antibiotics in landfill leachate has continued to increase. The accumulation of antibiotics will lead to the proliferation of drug-resistant bacteria and the spread of resistance genes in the water environment, which will damage environmental safety and ecological balance. Antibiotics are typical difficult-to-degrade organic pollutants. They are difficult to be completely removed in the current sewage treatment plant construction units, so that they remain in the effluent and eventually spread to the groundwater and other water environments. In addition, antibiotics are closely related to organic carbon (Org.C), nitrogen (N), sulfate (SO4 2- ) and other common pollutants coexist in landfill leachate, causing complex pollution problems and increasing the difficulty of treatment.

[0003] The antibiotics in my country's landfill leachate are mainly sulfonamides, tetracyclines, macrolides and quinolones, among which the concentration of quinolone antibiotics is relatively high, ranging from 2μg / L to 1mg / L. Among all quinolone antibiotics, the third-generation fluoroquinolone antibiotics (hereinafter referred to as fluoroquinolones) containing fluorine atoms and piperazine or methylpiperazine are the most common types of quinolones in landfill leachate, mainly including norfloxacin, ofloxacin, levofloxacin, ciprofloxacin, etc. Long-term exposure to fluoroquinolones can cause skin allergies, digestive and respiratory system damage, and produce neurotoxicity, which seriously endangers human health.

[0004] At present, physical and chemical methods and biological methods are mainly used for the treatment of fluoroquinolone-containing wastewater. Physicochemical methods such as membrane technology, physicochemical adsorption method, and advanced oxidation technology are currently commonly used process technologies. They are effective in treating high-concentration fluoroquinolone wastewater, but for complex polluted fluoroquinolone wastewater, the treatment process is complicated, the consumption of reagents and energy is large, the treatment cost is high, and secondary pollution is easy to occur. Compared with the physicochemical method, the biological method is considered to be a green and low-carbon technology for treating fluoroquinolone wastewater due to its advantages such as low cost, large treatment scale, and the ability to synergistically treat multiple pollutants. Biotechnology mainly includes: 1) Biosorption method, using microbial floccules or extracellular polymers in activated sludge as adsorbents to adsorb fluoroquinolones. However, adsorption is only a pollutant phase transfer process and cannot achieve the complete removal of fluoroquinolones; 2) Direct biodegradation, under aerobic or anaerobic conditions, fluoroquinolones are metabolized by certain bacteria or fungi as the only carbon source and electron donor, and are degraded and transformed. However, the slow decomposition rate of antibiotics and the long hydraulic retention time required for the process operation seriously limit the efficiency of the process treatment. In addition, the concentration of fluoroquinolones in sewage is relatively low, and microorganisms that use fluoroquinolones as the only carbon source grow slowly and are not easily enriched; 3) Cometabolic degradation, which effectively degrades fluoroquinolones and their metabolites by utilizing the cometabolic activity of microorganisms. In the microbial cometabolic degradation system, the growth substrate and electron donors (easily degradable organic carbon or reduced inorganic substances, etc.) can induce the expression of key enzymes for fluoroquinolone degradation, thereby rapidly decomposing and transforming fluoroquinolones through the cometabolic pathway, but the degradation activity and removal capacity of fluoroquinolones under microbial cometabolic action are low. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a system and method for simultaneous carbon removal, denitrification and antibiotic degradation and detoxification of landfill leachate. The system and method can simultaneously remove carbon, denitrification and antibiotic degradation and detoxification of landfill leachate.

[0006] To achieve the above object, the present invention discloses a method for simultaneous carbon removal, denitrification and antibiotic degradation and detoxification of landfill leachate, comprising the following steps:

[0007] Obtaining activated sludge enriched with autotrophic denitrifying bacteria, heterotrophic denitrifying bacteria and sulfate-reducing bacteria;

[0008] The activated sludge enriched with autotrophic denitrifying bacteria, heterotrophic denitrifying bacteria and sulfate-reducing bacteria is inoculated into the UASB reactor in equal proportions to enrich heterotrophic denitrifying bacteria, sulfur-oxidizing autotrophic denitrifying bacteria and sulfate-reducing bacteria, and the simulated landfill leachate is used as the UASB influent, and running sulfate is added to the UASB influent to maintain the UASB reactor running for a preset time;

[0009] The landfill leachate to be treated is added to the UASB reactor after running for a preset time.

[0010] Furthermore, it also includes:

[0011] The original anoxic and anaerobic sludge was collected from the A2 / O process sewage treatment plant as inoculated sludge, and then the inoculated sludge was inoculated into three sequencing batch reactors. The three sequencing batch reactors were respectively operated under sulfur autotrophic denitrification conditions, heterotrophic denitrification conditions and SO4 2- The acclimatization was carried out under biological reduction conditions to obtain activated sludge enriched with autotrophic denitrifying bacteria, heterotrophic denitrifying bacteria and sulfate-reducing bacteria.

[0012] Furthermore, under sulfur autotrophic denitrification conditions, Na2S2O3 was used as the electron donor and NaNO3 was used as the electron acceptor, wherein the concentrations of Na2S2O3 and NaNO3 were 500 mg S / L and 100 mg N / L, respectively.

[0013] Furthermore, under heterotrophic denitrification conditions, CH3COONa was used as the electron donor and NaNO3 was used as the electron acceptor, wherein the concentrations of CH3COONa and NaNO3 were 700 mg COD / L and 100 mg N / L, respectively.

[0014] Furthermore, SO4 2- Under biological reduction conditions, CH3COONa was used as the electron donor and Na2SO4 was used as the electron acceptor, wherein the concentrations of CH3COONa and Na2SO4 were 500 mg COD / L and 200 mg S / L, respectively.

[0015] Furthermore, the UASB influent included 600 mg COD / L of organic matter, 200 mg N / L of nitrate, 100 mg S / L of sulfate, and 500 mg S / L of thiosulfate.

[0016] Furthermore, the sludge concentration of the UASB reactor was controlled to be 3000-3500 mg / L, the temperature of the wastewater to be treated was 30-35° C., and the pH value was 7.4-7.6.

[0017] Furthermore, the hydraulic retention time of the UASB reactor is controlled to be 1.5 to 2 h.

[0018] Furthermore, the concentration of fluoroquinolones in the UASB influent was 0.5 mg / L.

[0019] The invention discloses a system for synchronous carbon removal, nitrogen removal and antibiotic degradation and detoxification of landfill leachate, comprising a landfill leachate input pipeline and a UASB reactor after running for a preset time, wherein the landfill leachate input pipeline is connected to the UASB reactor after running for a preset time.

[0020] The present invention has the following beneficial effects:

[0021] The system and method for simultaneous carbon removal, denitrification and antibiotic degradation and detoxification of landfill leachate described in the present invention adopts reducing sulfur and organic matter as co-metabolic substrate carbon sources to induce the expression of key enzyme genes and increase the activity of key enzymes, thereby improving the degradation efficiency of fluoroquinolones; in addition, through the synergistic effect of sulfate bioreduction and denitrification, the co-metabolic degradation of fluoroquinolone antibiotics is further enhanced, thereby improving the removal efficiency of fluoroquinolones in low C / N wastewater such as landfill leachate.

[0022] Furthermore, the present invention uses reducing sulfur and organic matter as co-metabolic substrate carbon sources, which can effectively promote the growth, reproduction and activity of microorganisms, thereby improving the degradation efficiency of fluoroquinolones, and has a better treatment effect than traditional biological treatment methods.

[0023] Furthermore, the present invention determines the addition ratio of fluoroquinolone, reducing sulfur and organic matter, which can accurately control the reaction conditions in actual operation, ensure the stability and efficiency of the degradation process, and improve the controllability and feasibility of wastewater treatment.

[0024] Furthermore, the present invention uses reducing sulfur and organic matter as co-metabolic substrate carbon sources, which has relatively low cost and can reduce the cost of wastewater treatment, making the technology more economical and feasible, and providing a more economical and efficient solution for wastewater treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0026] Figure 1 Schematic diagram of denitrification performance of UASB reactor within 90 days;

[0027] Figure 2 This is the removal result of norfloxacin in the UASB reactor. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0030] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0031] It should be further understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0032] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0033] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can usually be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0035] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0036] Embodiment 1

[0037] The method for simultaneous carbon removal, denitrification and antibiotic degradation and detoxification of landfill leachate of the present invention comprises the following steps:

[0038] The original anoxic and anaerobic sludge was collected from the A2 / O process sewage treatment plant as inoculated sludge, and then the inoculated sludge was inoculated into three sequencing batch reactors. The three sequencing batch reactors were respectively operated under sulfur autotrophic denitrification conditions, heterotrophic denitrification conditions and SO4 2- The acclimatization was carried out under biological reduction conditions to obtain activated sludge enriched with autotrophic denitrifying bacteria, heterotrophic denitrifying bacteria and sulfate-reducing bacteria.

[0039] Among them, under the conditions of sulfur autotrophic denitrification, Na2S2O3 was used as the electron donor and NaNO3 was used as the electron acceptor, and the concentrations of Na2S2O3 and NaNO3 were 500 mg S / L and 100 mg N / L, respectively.

[0040] Under heterotrophic denitrification conditions, CH3COONa was used as the electron donor and NaNO3 was used as the electron acceptor, wherein the concentrations of CH3COONa and NaNO3 were 700 mg COD / L and 100 mg N / L, respectively.

[0041] SO4 2-Under biological reduction conditions, CH3COONa was used as the electron donor and Na2SO4 was used as the electron acceptor, wherein the concentrations of CH3COONa and Na2SO4 were 500 mg COD / L and 200 mg S / L, respectively.

[0042] The activated sludge enriched with autotrophic denitrifying bacteria, heterotrophic denitrifying bacteria and sulfate-reducing bacteria was inoculated into the UASB reactor in equal proportions to enrich heterotrophic denitrifying bacteria, sulfur-oxidizing autotrophic denitrifying bacteria and sulfate-reducing bacteria. The simulated landfill leachate was used as the UASB influent, and running sulfate was added to the UASB influent, wherein the UASB influent contained fluoroquinolones, organic carbon, ammonia nitrogen, nitrate and sulfate. After the UASB reactor had been running for a preset time, the landfill leachate was treated using the UASB reactor.

[0043] The UASB influent includes organic matter (600 mg COD / L), nitrate (200 mg N / L), sulfate (100 mg S / L) and thiosulfate (500 mg S / L).

[0044] The sludge concentration of the UASB reactor is controlled to be 3000-3500 mg / L, the temperature of the wastewater to be treated is 30-35°C, and the pH value is 7.4-7.6.

[0045] As an implementation method of the present invention, the hydraulic retention time of the UASB reactor is controlled to be 1.5 to 2 hours.

[0046] As an embodiment of the present invention, the concentration of fluoroquinolone in the UASB influent is 0.5 mg / L.

[0047] Bio-cometabolic degradation technology has attracted much attention in recent years. Through the cometabolic activity of microorganisms, fluoroquinolones and their metabolites can be effectively decomposed. During the cometabolic degradation process, growth substrates and electron donors can induce the expression of key enzymes for fluoroquinolone degradation, thereby accelerating the degradation rate and improving the removal efficiency. In addition, under antibiotic stress, microbial communities can regulate a variety of physiological and biochemical functions through quorum sensing mechanisms, enhancing the synergistic removal ability of various pollutants in wastewater. Therefore, cometabolic technology provides a new solution for treating fluoroquinolone wastewater. Compared with the prior art, the present invention uses reduced sulfur and organic matter as the cometabolism substrate carbon source, and the advantages are: 1) using reduced sulfur and organic matter as the cometabolism substrate carbon source can effectively promote the growth, reproduction and activity of microorganisms, thereby improving the degradation efficiency of fluoroquinolones, and having better treatment effect than the traditional biological treatment method; 2) the present invention determines the addition ratio of fluoroquinolones, reduced sulfur and organic matter, and can accurately control the reaction conditions in actual operation, ensure the stability and efficiency of the degradation process, and improve the controllability and feasibility of wastewater treatment; 3) the present invention uses reduced sulfur and organic matter as the cometabolism substrate carbon source, and the cost is relatively low, which can reduce the cost of wastewater treatment, making the technology more economical and feasible, and providing a more economical and efficient solution for wastewater treatment. The present invention can significantly improve the degradation efficiency of fluoroquinolones in wastewater by adding reduced sulfur and organic matter as the cometabolism substrate of denitrifying microorganisms, and has guiding and reference significance for degrading other antibiotics in antibiotic wastewater.

[0048] Embodiment 2

[0049] The method for simultaneous carbon removal, denitrification and antibiotic degradation and detoxification of landfill leachate of the present invention comprises the following steps:

[0050] Obtaining activated sludge enriched with autotrophic denitrifying bacteria, heterotrophic denitrifying bacteria and sulfate-reducing bacteria;

[0051] The activated sludge enriched with autotrophic denitrifying bacteria, heterotrophic denitrifying bacteria and sulfate-reducing bacteria is inoculated into the UASB reactor in equal proportions to enrich heterotrophic denitrifying bacteria, sulfur-oxidizing autotrophic denitrifying bacteria and sulfate-reducing bacteria, and the simulated landfill leachate is used as the UASB influent, and running sulfate is added to the UASB influent to maintain the UASB reactor running for a preset time;

[0052] The landfill leachate to be treated is added to the UASB reactor after running for a preset time.

[0053] Accordingly, the present invention discloses a system for simultaneous carbon removal, denitrification and antibiotic degradation and detoxification of landfill leachate, comprising a landfill leachate input pipeline and a UASB reactor after a preset operation time, wherein the landfill leachate input pipeline is connected to the UASB reactor after a preset operation time.

[0054] Embodiment 3

[0055] This embodiment includes the following steps:

[0056] The original anoxic and anaerobic sludge was collected from the A2 / O process sewage treatment plant as inoculated sludge. Three sequencing batch reactors were used to perform sulfur autotrophic denitrification, heterotrophic denitrification, and SO4 2- The sludge was domesticated under the condition of biological reduction, and activated sludge enriched with autotrophic denitrifying bacteria, heterotrophic denitrifying bacteria and sulfate-reducing bacteria was obtained respectively.

[0057] After the acclimation, the three types of sludge were inoculated into the UASB reactor in equal proportions. The UASB reactor can enrich the corresponding heterotrophic denitrifying bacteria, sulfur-oxidizing autotrophic denitrifying bacteria and sulfate-reducing bacteria. After the enrichment is completed, the simulated landfill leachate is used as the UASB influent, and thiosulfate is additionally added to the influent.

[0058] The UASB influent contained 600 mg COD / L of organic matter, 200 mg N / L of nitrate, 100 mg S / L of sulfate, and 500 mg S / L of thiosulfate.

[0059] The sludge concentration in the UASB reactor was controlled to be 3000 mg / L, the temperature of the wastewater to be treated was 35°C, and the pH value was 7.5.

[0060] The hydraulic retention time of the UASB reactor was controlled to be 1.5 h.

[0061] Phase 1: During the reaction period of 0-30 days, the influent concentration in the UASB reactor is: NO3 - -N is 200mg / L, Na2S2O3-S is 500mg / L, and COD is 600mg / L.

[0062] Phase II: During the reaction period of 31-60 days, the influent concentrations in the UASB reactor were: norfloxacin 0.5 mg / L, NO3 - -N is 200mg / L, Na2S2O3-S is 500mg / L, and COD is 600mg / L.

[0063] Phase III: During the reaction period of 61-90 days, the influent concentrations in the UASB reactor were: norfloxacin 0.5 mg / L, NO3 - -N is 200mg / L, Na2S2O3-S is 500mg / L, COD is 600mg / L, SO4 2- It is 100mg / L.

[0064] The total response time was 90 days.

[0065] According to the above test results, Figure 1 As shown in the figure, the average removal rate of nitrate nitrogen in the reactor from day 0 to 30 was 97.35±0.03%. When 0.5 mg / L of norfloxacin was added to the influent from day 31 to 60 and the reactor was operated continuously for 30 days, it can be seen that the removal rate of nitrate nitrogen was not significantly affected, and the average removal rate could reach 97.06±0.03%, without nitrite nitrogen accumulation. In addition, the removal of norfloxacin in the UASB reactor was monitored, as shown in the figure. Figure 2 As shown. In the initial operation (31-32 days), the removal rate of norfloxacin was high, which may be because there are more active sites for adsorbing antibiotics in the granular sludge at the initial exposure. After stable operation, the average removal rate of antibiotics was 83.20±0.02%, which shows that the polyculture denitrification system has good tolerance and removal effect on antibiotics. After 60 days of operation, the removal rate of norfloxacin containing SO4 2- After the addition of the wastewater containing norfloxacin, reduced sulfur source and organic matter, the denitrification activity and efficiency were not significantly affected. 2- With the increase in production, the degradation rate and efficiency of norfloxacin were further improved, and the average removal rate could reach 96.20±0.02%. In summary, the degradation efficiency of fluoroquinolones in wastewater can be significantly improved by adding reduced sulfur and organic matter to landfill leachate as co-metabolism substrates for denitrifying microorganisms.

[0066] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0067] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0068] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A method for simultaneous carbon removal, denitrification and antibiotic degradation and detoxification of landfill leachate, characterized in that: The following steps are involved: Obtaining activated sludge enriched with autotrophic denitrifying bacteria, heterotrophic denitrifying bacteria and sulfate-reducing bacteria; The activated sludge enriched with autotrophic denitrifying bacteria, heterotrophic denitrifying bacteria and sulfate-reducing bacteria is inoculated into the UASB reactor in equal proportions to enrich heterotrophic denitrifying bacteria, sulfur-oxidizing autotrophic denitrifying bacteria and sulfate-reducing bacteria, and the simulated landfill leachate is used as the UASB influent, and running sulfate is added to the UASB influent to maintain the UASB reactor running for a preset time; The landfill leachate to be treated is added to the UASB reactor after running for a preset time.

2. The method for simultaneous carbon removal, denitrification and antibiotic degradation and detoxification of landfill leachate according to claim 1, characterized in that: Also includes: The original anoxic and anaerobic sludge was collected from the A2 / O process sewage treatment plant as inoculated sludge, and then the inoculated sludge was inoculated into three sequencing batch reactors. The three sequencing batch reactors were respectively operated under sulfur autotrophic denitrification conditions, heterotrophic denitrification conditions and SO4 2- The acclimatization was carried out under biological reduction conditions to obtain activated sludge enriched with autotrophic denitrifying bacteria, heterotrophic denitrifying bacteria and sulfate-reducing bacteria.

3. The method for simultaneous carbon removal, denitrification and antibiotic degradation and detoxification of landfill leachate according to claim 1, characterized in that: Under sulfur autotrophic denitrification conditions, Na2S2O3 was used as the electron donor and NaNO3 as the electron acceptor, where the concentrations of Na2S2O3 and NaNO3 were 500 mg S / L and 100 mg N / L, respectively.

4. The method for simultaneous carbon removal, denitrification and antibiotic degradation and detoxification of landfill leachate according to claim 1, characterized in that: Under heterotrophic denitrification conditions, CH3COONa was used as the electron donor and NaNO3 was used as the electron acceptor, wherein the concentrations of CH3COONa and NaNO3 were 700 mg COD / L and 100 mg N / L, respectively.

5. The method for simultaneous carbon removal, denitrification and antibiotic degradation and detoxification of landfill leachate according to claim 1, characterized in that: SO4 2- Under biological reduction conditions, CH3COONa was used as the electron donor and Na2SO4 was used as the electron acceptor, wherein the concentrations of CH3COONa and Na2SO4 were 500 mg COD / L and 200 mg S / L, respectively.

6. The method for simultaneous carbon removal, denitrification and antibiotic degradation and detoxification of landfill leachate according to claim 1, characterized in that: The UASB influent contained 600 mg COD / L of organic matter, 200 mg N / L of nitrate, 100 mg S / L of sulfate, and 500 mg S / L of thiosulfate.

7. The method for simultaneous carbon removal, denitrification and antibiotic degradation and detoxification of landfill leachate according to claim 1, characterized in that: The sludge concentration of the UASB reactor was controlled to be 3000-3500 mg / L, the temperature of the wastewater to be treated was 30-35°C, and the pH value was 7.4-7.

6.

8. The method for simultaneous carbon removal, denitrification and antibiotic degradation and detoxification of landfill leachate according to claim 1, characterized in that: The hydraulic retention time of the UASB reactor is controlled to be 1.5 to 2 hours.

9. The method for simultaneous carbon removal, denitrification and antibiotic degradation and detoxification of landfill leachate according to claim 1, characterized in that: The concentration of fluoroquinolones in the UASB influent was 0.5 mg / L.

10. A system for simultaneous carbon removal, denitrification and antibiotic degradation and detoxification of landfill leachate, characterized in that: The invention comprises a garbage leachate input pipeline and a UASB reactor after the operation for a preset time obtained in claim 1, wherein the garbage leachate input pipeline is connected with the UASB reactor after the operation for a preset time.

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