Sulfur autotrophy coupling hydrolytic acidification reinforced low-carbon-nitrogen-ratio wastewater nitrogen and carbon removal system and process

Abstract

The invention discloses a sulfur autotrophic coupling hydrolytic acidification reinforced low carbon nitrogen ratio wastewater nitrogen and carbon removal system, which comprises a sulfur autotrophic denitrification zone, a hydrolytic acidification zone, an anoxic zone, an aerobic zone and a reduction state sulfur medium, the reduction state sulfur medium is added in the sulfur autotrophic denitrification zone, the sulfur autotrophic denitrification zone is provided with a water inlet, and the hydrolytic acidification zone is provided with a water outlet. The sulfur autotrophic denitrification area is divided into a sulfur autotrophic descending area and a sulfur autotrophic ascending area; the hydrolytic acidification area is divided into a hydrolytic acidification descending area and a hydrolytic acidification ascending area, an aerator is arranged along the bottom of the aerobic area, and a water outlet and an anoxic area backflow pipeline connected with the anoxic area are arranged along the side part of the aerobic area. Wastewater enters the sulfur autotrophic denitrification nitrogen removal area after being pretreated, sulfur oxidizing bacteria reduce nitrate into nitrogen by taking a sulfur electron donor in a reduction state and taking nitrate as an electron acceptor, so that nitrogen removal is realized, the nitrogen removal effect is consolidated and improved, and the cost is also saved; meanwhile, the carbon removal effect is improved through the hydrolytic acidification effect and the effects of the aerobic zone and the anoxic zone.

Description

Technical Field

[0001] The invention relates to sewage treatment technology, and in particular to a sulfur autotrophic coupled hydrolysis acidification enhanced low carbon-nitrogen ratio wastewater denitrification and carbon removal system and process. Background Art

[0002] At present, with the rapid development of cities in my country, the problem of water pollution is becoming increasingly serious. Carbon, nitrogen and phosphorus are the main pollutants in water bodies. Among them, carbon-containing pollutants will consume dissolved oxygen when degraded in water bodies, and nitrogen- and phosphorus-containing pollutants will cause eutrophication of water bodies, which will eventually break the balance of aquatic ecosystems and aggravate the problem of water pollution.

[0003] Patent document with application number "CN201210251940.9" discloses a biological treatment method for simultaneous denitrification and carbon removal of ASBBR anaerobic ammonia oxidation and denitrification wastewater, which uses anaerobic digestion sludge or denitrification sludge as inoculated sludge, inoculates it into a reactor, and controls the concentration of the sludge mixed liquid; enrichment and cultivation of anaerobic ammonia oxidizing bacteria and denitrifying bacteria are achieved by artificial water distribution method of adding ammonium chloride, sodium nitrite and sodium carbonate; enrichment and cultivation of a mixed flora of anaerobic ammonia oxidizing bacteria and denitrifying bacteria are started on the basis of successful enrichment and cultivation of anaerobic ammonia oxidizing bacteria, and COD concentration is adjusted by glucose, the mixed flora has a removal effect on ammonia nitrogen, nitrite nitrogen and COD, and the synergistic mixed flora of anaerobic ammonia oxidizing bacteria and denitrifying bacteria is successfully enriched and cultivated, thereby achieving simultaneous denitrification and carbon removal of wastewater; denitrification and carbon removal are completed in one step, the process is simple, no aeration and addition of external carbon source are required, cost is saved, sludge production and treatment cost are low, and the environment is friendly.

[0004] The patent document with application number "CN201710201164.4" discloses a wastewater deep denitrification and carbon removal treatment device and its process, which is composed of an anoxic denitrification biofilter, an ozone oxidation tank, an aerobic carbon removal nitrification biofilter, and a clear water tank connected in series in sequence, and a nitrification liquid reflux system is provided between the water inlet of the anoxic denitrification biofilter and the clear water tank. The wastewater passes through the anoxic denitrification filter using an external carbon source to complete the denitrification denitrification and alkali production process; then flows into the ozone oxidation tank to remove part of the organic matter; flows into the aerobic carbon removal nitrification biofilter again, and the microorganisms fully utilize the dissolved oxygen in the effluent to achieve the purpose of removing organic matter and ammonia nitrogen; finally enters the clear water tank, and part of the wastewater is refluxed to the anoxic denitrification filter as a reflux nitrification liquid, and part of the wastewater meets the standards and is discharged. The present invention makes full use of the denitrification alkali production process, avoids the influence of dissolved oxygen on denitrification denitrification, makes full use of ozone tail gas and effluent dissolved oxygen, greatly reduces energy consumption, and has obvious advantages.

[0005] The above patent documents, combined with the prior art, reveal that the anaerobic ammonia oxidation, anoxic denitrification coupled with ozone oxidation enhanced denitrification and carbon removal system has the following defects:

[0006] In the actual sewage treatment process, the removal of nitrogen-containing pollutants mainly relies on traditional heterotrophic denitrification reactions. Heterotrophic denitrifying bacteria need to consume organic carbon sources in the process of denitrification. For low carbon-nitrogen ratio sewage, it is necessary to add an external carbon source to complete the denitrification process. On the one hand, it increases operating costs, leads to sludge production, and cumbersome operations. On the other hand, it is impossible to accurately add carbon sources due to fluctuations in water quality. Excessive addition not only causes waste but also leads to excessive organic matter in the effluent. Insufficient addition will lead to incomplete denitrification and unsatisfactory denitrification effects. For sewage with high carbon removal requirements, advanced oxidation technologies such as ozone oxidation and Fenton oxidation or membrane systems such as nanofiltration and reverse osmosis are conventionally used to achieve this, which has high operating costs, unstable system operation or certain risks. Therefore, the development of efficient denitrification and stable carbon removal process systems for low carbon-nitrogen ratio sewage has become a research direction in the field of sewage treatment technology. Summary of the invention

[0007] In order to overcome the deficiencies of the prior art, the present invention provides a sulfur autotrophic coupled hydrolysis acidification enhanced low carbon-nitrogen ratio wastewater denitrification and carbon removal system and process, which solves the drawbacks of the technology involved in the above patents.

[0008] The first aspect of the present invention is to provide a sulfur autotrophic coupled hydrolysis and acidification enhanced low carbon-nitrogen ratio wastewater denitrification and carbon removal system, comprising a sulfur autotrophic denitrification zone, a hydrolysis and acidification zone, an anoxic zone, an aerobic zone, and a reduced sulfur medium, wherein the reduced sulfur medium is added to the sulfur autotrophic denitrification zone, the sulfur autotrophic denitrification zone is provided with a water inlet, the sulfur autotrophic denitrification zone is divided into a sulfur autotrophic descending zone and a sulfur autotrophic ascending zone which are interconnected, the water inlet is sequentially connected to the sulfur autotrophic descending zone and the sulfur autotrophic ascending zone, and the sulfur autotrophic denitrification zone is provided with a water inlet. The hydrolysis and acidification zone is provided with a sulfur autotrophic filler assembly along the upper part; the hydrolysis and acidification zone is divided into a hydrolysis and acidification descending zone and a hydrolysis and acidification ascending zone which are interconnected, the hydrolysis and acidification descending zone is connected with the sulfur autotrophic ascending zone, and the hydrolysis and acidification zone is provided with a hydrolysis and acidification filler assembly along the upper part; the anoxic zone is respectively connected with the hydrolysis and acidification ascending zone and the aerobic zone, the aerobic zone is provided with an aerator along the bottom, and the aerobic zone is provided with a water outlet along the side and an anoxic zone reflux pipeline for connecting with the anoxic zone.

[0009] In the first aspect of the present invention, as a preferred embodiment, the sulfur autotrophic descending filler includes a sulfur autotrophic descending filler and a sulfur autotrophic ascending filler, the sulfur autotrophic descending filler is arranged in the sulfur autotrophic descending zone, and the sulfur autotrophic ascending filler is arranged in the sulfur autotrophic ascending zone.

[0010] In the first aspect of the present invention, as a preferred embodiment, a sulfur autotrophic partition is provided between the sulfur autotrophic descending zone and the sulfur autotrophic ascending zone, and the sulfur autotrophic partition is located at the upper part of the sulfur autotrophic denitrification zone, so that the lower parts of the sulfur autotrophic descending zone and the sulfur autotrophic ascending zone are connected.

[0011] In the first aspect of the present invention, as a preferred embodiment, the sulfur autotrophic rising zone is provided with a sulfur autotrophic rising stirring component.

[0012] In the first aspect of the present invention, as a preferred embodiment, the hydrolysis acidification filler assembly includes a hydrolysis acidification descending filler and a hydrolysis acidification ascending filler, the hydrolysis acidification descending filler is arranged in the hydrolysis acidification descending zone, and the hydrolysis acidification ascending filler is arranged in the hydrolysis acidification ascending zone.

[0013] In the first aspect of the present invention, as a preferred embodiment, a hydrolysis acidification partition is provided between the hydrolysis acidification descending zone and the hydrolysis acidification ascending zone, and the hydrolysis acidification partition is located at the upper part of the hydrolysis acidification zone, so that the lower parts of the hydrolysis acidification descending zone and the hydrolysis acidification ascending zone are connected.

[0014] In the first aspect of the present invention, as a preferred embodiment, the hydrolysis acidification descending zone and the hydrolysis acidification ascending zone are both provided with a hydrolysis acidification agitator.

[0015] In the first aspect of the present invention, as a preferred embodiment, the anoxic zone is divided into a first anoxic zone, a second anoxic zone, and a third anoxic zone, and the first anoxic zone, the second anoxic zone, and the third anoxic zone are all provided with anoxic agitators.

[0016] In the first aspect of the present invention, as a preferred embodiment, the aerobic zone is also provided with a sludge removal and phosphorus removal pipeline.

[0017] The second aspect of the present invention provides a sulfur autotrophic coupled hydrolysis acidification enhanced low carbon-nitrogen ratio wastewater denitrification and carbon removal system treatment process, comprising the following steps:

[0018] Step S10: Add reduced sulfur medium into the sulfur autotrophic denitrification zone, and the wastewater enters the sulfur autotrophic denitrification zone through the water inlet, fully reacts with the sulfur autotrophic filler component, and passes through the sulfur autotrophic descending zone and the sulfur autotrophic ascending zone in sequence;

[0019] Step S20: the wastewater passing through the sulfur autotrophic denitrification zone flows into the hydrolysis acidification descending zone and the hydrolysis acidification ascending zone in sequence, and fully reacts with the hydrolysis acidification filler components, so that the hydrolysis acidification bacteria are fully in contact with the difficult-to-degrade organic matter and macromolecular organic matter in the wastewater, and the difficult-to-degrade organic matter is hydrolyzed into small-molecule organic matter by the microbial extracellular enzyme, and the small-molecule organic matter is further converted into easily biodegradable substances such as volatile fatty acids under the action of acidification bacteria;

[0020] Step S30: the wastewater passing through the hydrolysis and acidification zone flows into the anoxic zone, and the denitrifying bacteria, as heterotrophic microorganisms, utilize the oxygen of the nitrate in the mixed liquor refluxed from the aerobic zone as an electron acceptor and the easily degradable organic matter brought from the hydrolysis and acidification zone as an electron donor to reduce the nitrite nitrogen and nitrate nitrogen into gaseous nitrogen;

[0021] Step S40: The wastewater passing through the anoxic zone flows into the aerobic zone. The wastewater completes the excessive phosphorus uptake by polyphosphate bacteria and the ammonia nitrogen nitrification process by nitrifying bacteria in the aerobic pool. Biological phosphorus removal is completed by discharging phosphorus-rich sludge, and nitrate nutrients are provided for the subsequent heterotrophic nitrogen removal unit in the anoxic zone.

[0022] In the second aspect of the present invention, as a preferred embodiment, in the step S10, when "reduced sulfur medium is added to the sulfur autotrophic denitrification zone, wastewater enters the sulfur autotrophic denitrification zone through the water inlet, fully reacts with the sulfur autotrophic filler component, and passes through the sulfur autotrophic descending zone and the sulfur autotrophic ascending zone in sequence", an agitator is used in the ascending zone to form a circulating flow in the sulfur autotrophic denitrification zone.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. After pretreatment, the wastewater enters the sulfur autotrophic denitrification zone. Sulfur oxidizing bacteria use reduced sulfur electron donors and nitrate as electron acceptors to reduce nitrate to nitrogen gas, thereby achieving nitrogen removal.

[0025] 2. The coupled hydrolysis and acidification treatment process mainly converts the difficult-to-biodegrade organic matter into easily biodegradable organic matter, which is convenient for use in the subsequent biological treatment stage.

[0026] 3. In the anoxic zone, heterotrophic denitrifying bacteria remove nitrogen, and in the aerobic zone, excess phosphorus absorption by polyphosphate bacteria, ammonia nitrogen nitrification by nitrifying bacteria, and removal of dissolved organic matter as a carbon source are completed, achieving enhanced denitrification, phosphorus removal, and enhanced carbon removal. Through the denitrification of inorganic carbon sources by sulfur autotrophic denitrifying bacteria and the denitrification of organic carbon sources by heterotrophic denitrifying bacteria, the denitrification effect is consolidated and improved;

[0027] 4. Through the hydrolysis and acidification zone, the availability of organic matter in the wastewater is improved, which not only improves the utilization of internal carbon sources but also avoids the addition of external carbon sources in the subsequent biological treatment section, saving costs and improving carbon removal effects; the subsequent anoxic zone and aerobic zone use the dissolved organic matter in the wastewater to complete reactions such as heterotrophic denitrification, polyphosphate absorption by polyphosphate bacteria, and nitrification by heterotrophic nitrifying bacteria, and carbon removal is also enhanced in the process. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural diagram of the present invention;

[0029] Figure 2 This is the structural diagram of the sulfur autotrophic denitrification zone;

[0030] Figure 3 It is the structural diagram of the hydrolysis acidification zone;

[0031] Figure 4 This is the structural diagram of the hypoxic zone;

[0032] Figure 5 This is the structural diagram of the aerobic zone;

[0033] Figure 6 It is a flow chart of the present invention.

[0034] In the figure: 1000, sulfur autotrophic denitrification zone; 100, water inlet; 101, sulfur autotrophic descending zone; 102, sulfur autotrophic ascending zone; 103, sulfur autotrophic baffle; 104, sulfur autotrophic filler assembly; 1041, sulfur autotrophic descending filler; 1042, sulfur autotrophic ascending filler; 1043, sulfur autotrophic ascending stirring assembly;

[0035] 2000, hydrolysis acidification zone; 201, hydrolysis acidification descending zone; 202, hydrolysis acidification ascending zone; 203, hydrolysis acidification baffle; 204, hydrolysis acidification packing assembly; 2041, hydrolysis acidification descending packing; 2042, hydrolysis acidification ascending packing; 2043, hydrolysis acidification agitator;

[0036] 3000, anoxic zone; 301, first anoxic zone; 302, second anoxic zone; 303, third anoxic zone; 304, anoxic agitator;

[0037] 4000, aerobic zone; 401, aerator; 402, water outlet; 403, anoxic zone return pipeline; 404, sludge removal and phosphorus removal pipeline;

[0038] 5000. Reduced sulfur medium. DETAILED DESCRIPTION

[0039] Below, in conjunction with the accompanying drawings and specific embodiments, the invention is further described. It should be noted that, under the premise of no conflict, the various embodiments described below or the various technical features can be arbitrarily combined to form a new embodiment. Except as otherwise specified, the materials and equipment used in this embodiment can be purchased from the market. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0040] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In the description of the present application, "plurality" means two or more, unless otherwise precisely and specifically specified.

[0041] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be connected through an intermediary medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0043] like Figure 1-5As shown, a sulfur autotrophic coupled hydrolysis acidification enhanced low carbon-nitrogen ratio wastewater denitrification and carbon removal system comprises a sulfur autotrophic denitrification zone 1000, a hydrolysis acidification zone 2000, an anoxic zone 3000, an aerobic zone 4000, and a reduced sulfur medium 5000, wherein the reduced sulfur medium 5000 is placed in the sulfur autotrophic denitrification zone 1000, the sulfur autotrophic denitrification zone 1000 is provided with a water inlet 100, the sulfur autotrophic denitrification zone 1000 is divided into a sulfur autotrophic descending zone 101 and a sulfur autotrophic ascending zone 102 which are interconnected, the water inlet 100 is sequentially connected to the sulfur autotrophic descending zone 101 and the sulfur autotrophic ascending zone 102, and the sulfur autotrophic denitrification zone 1000 is connected along the upper The upper and lower parts of the hydrolysis and acidification zone 2000 are provided with a sulfur autotrophic filler assembly 104; the hydrolysis and acidification zone 2000 is divided into a hydrolysis and acidification descending zone 201 and a hydrolysis and acidification ascending zone 202 which are interconnected, the hydrolysis and acidification descending zone 201 is connected to the sulfur autotrophic ascending zone 102, and the hydrolysis and acidification zone 2000 is provided with a hydrolysis and acidification filler assembly 204 along the upper part; the anoxic zone 3000 is respectively connected to the hydrolysis and acidification ascending zone 202 and the aerobic zone 4000, the aerobic zone 4000 is provided with an aerator 401 along the bottom, and the aerobic zone 4000 is provided with a water outlet 402 and an anoxic zone return line 403 for connecting to the anoxic zone 3000 along the side. On the one hand, the wastewater enters the sulfur autotrophic denitrification zone after pretreatment, and the sulfur oxidizing bacteria use the reduced sulfur electron donor and nitrate as the electron acceptor to reduce nitrate to nitrogen gas to achieve nitrogen removal. On the other hand, the coupled hydrolysis and acidification treatment process mainly converts the difficult-to-biodegrade organic matter into easily biodegradable organic matter, which is convenient for use in the subsequent biological treatment stage. Furthermore, the heterotrophic denitrification bacteria denitrification is completed in the anoxic zone, and the excessive phosphorus absorption of polyphosphate bacteria, the ammonia nitrogen nitrification of nitrifying bacteria, and the removal of dissolved organic matter as a carbon source are completed in the aerobic zone, so as to achieve the effects of enhanced denitrification, phosphorus removal and enhanced carbon removal. Through the denitrification of inorganic carbon sources by sulfur autotrophic denitrifying bacteria and the denitrification of organic carbon sources by heterotrophic denitrifying bacteria, the denitrification effect is consolidated and improved; in summary, through the hydrolysis and acidification zone, the utilization rate of organic matter in the wastewater is improved, which not only improves the utilization of internal carbon sources but also avoids the addition of external carbon sources in the subsequent biological treatment stage, which saves costs and improves the carbon removal effect; the subsequent anoxic and aerobic zones use dissolved organic matter in the wastewater to complete reactions such as heterotrophic denitrification, polyphosphate bacteria absorption, and heterotrophic nitrification, and carbon removal is also enhanced in the process.

[0044] It should be noted that compared with heterotrophic denitrification technology, sulfur autotrophic denitrification technology does not require the addition of an organic carbon source. Under anaerobic conditions, by adding reduced sulfur electron donors and inorganic carbon sources, sulfur oxidizing bacteria oxidize sulfide in sewage to sulfate and reduce nitrate nitrogen to nitrogen gas, thereby achieving nitrogen removal. On the one hand, reduced sulfur and inorganic carbon sources are cheap and easy to obtain, with low biological toxicity, which reduces the operating cost of denitrification; on the other hand, the microbial biomass of the metabolic process of sulfur autotrophic denitrifying bacteria is low, which greatly reduces the amount of residual sludge and reduces the cost of sludge treatment and disposal. Therefore, when treating low carbon-nitrogen ratio sewage, sulfur autotrophic denitrification technology has always been regarded as a promising new biological denitrification technology to overcome the limitations of traditional heterotrophic denitrification technology. At present, the more commonly used form is the sulfur-limestone autotrophic denitrification biofilter, but this fixed bed biofilter is prone to clogging and requires regular flushing and replacement of the filter media. In addition, the filter media is prone to uneven distribution, the process operation is complicated, and the cost of filler replacement and maintenance is high, which limits the actual engineering application of sulfur autotrophic denitrification technology.

[0045] Hydrolysis and acidification are two stages of the anaerobic digestion process, but the treatment purposes of hydrolysis and acidification are different in different processes. The purpose of hydrolysis in the hydrolysis acidification-aerobic biological treatment process is mainly to convert the insoluble organic matter in the original wastewater into soluble organic matter, especially for industrial wastewater, mainly to convert the difficult-to-biodegrade organic matter into easily biodegradable organic matter, to improve the biodegradability of the wastewater, so as to facilitate subsequent aerobic treatment. For wastewater with a low carbon-nitrogen ratio, the hydrolysis and acidification reaction can not only convert large molecular organic matter into small molecules to improve the biodegradability of the wastewater, but also directly remove some organic matter through assimilation.

[0046] Therefore, the present application proposes a sulfur autotrophic coupled hydrolysis and acidification enhanced low carbon-nitrogen ratio wastewater denitrification and carbon removal process system. Under low carbon-nitrogen ratio influent conditions, denitrification can be completed economically and efficiently through the action of sulfur autotrophic denitrification without the need for an external carbon source. At the same time, in order to meet the requirements of low organic matter indicators in effluent, for example: effluent CODcr≤20mg / L, through hydrolysis and acidification, the biodegradability of wastewater can be stably and efficiently improved, the subsequent heterotrophic denitrification by denitrification bacteria, the phosphorus absorption by polyphosphate bacteria and the nitrification in the aerobic zone can be enhanced, and carbon removal can be enhanced simultaneously.

[0047] In the first aspect of the present invention, as a preferred embodiment, the sulfur autotrophic descending filler 1041 includes a sulfur autotrophic descending filler 1041 and a sulfur autotrophic ascending filler 1042, wherein the sulfur autotrophic descending filler 1041 is arranged in the sulfur autotrophic descending zone 101, and the sulfur autotrophic ascending filler 1042 is arranged in the sulfur autotrophic ascending zone 102. Specifically, a sulfur autotrophic partition 103 is arranged between the sulfur autotrophic descending zone 101 and the sulfur autotrophic ascending zone 102, and the sulfur autotrophic partition 103 is located at the upper part of the sulfur autotrophic denitrification zone 1000, so that the lower parts of the sulfur autotrophic descending zone 101 and the sulfur autotrophic ascending zone 102 are connected. Specifically, the sulfur autotrophic ascending zone 102 is provided with a sulfur autotrophic ascending stirring component 1043. A sulfur autotrophic ascending stirring assembly 1043 is provided. Through the design of the shape and direction of the impeller, the rotation can form a certain ascending flow rate, further strengthen the circulation formed in the descending area of ​​the sulfur autotrophic denitrification zone and the ascending area of ​​the sulfur autotrophic denitrification zone, and improve the sulfur autotrophic denitrification reaction efficiency. If necessary, an agitator can also be provided in the descending area of ​​the sulfur autotrophic denitrification zone to form a downward thrust force.

[0048] In the first aspect of the present invention, as a preferred embodiment, the hydrolysis acidification filler assembly 204 includes a hydrolysis acidification descending filler 2041 and a hydrolysis acidification ascending filler 2042, wherein the hydrolysis acidification descending filler 2041 is arranged in the hydrolysis acidification descending zone 201, and the hydrolysis acidification ascending filler 2042 is arranged in the hydrolysis acidification ascending zone 202. Specifically, a hydrolysis acidification partition 203 is arranged between the hydrolysis acidification descending zone 201 and the hydrolysis acidification ascending zone 202, and the hydrolysis acidification partition 203 is located at the upper part of the hydrolysis acidification zone 2000, so that the lower parts of the hydrolysis acidification descending zone 201 and the hydrolysis acidification ascending zone 202 are connected. Specifically, the hydrolysis acidification descending zone 201 and the hydrolysis acidification ascending zone 202 are both provided with a hydrolysis acidification agitator 2043. Agitators are respectively arranged in the descending zone and the ascending zone of the hydrolysis acidification zone. Through the design of the shape and direction of the impeller, the rotation can form a certain driving flow velocity, further strengthening the circulation formed in the descending zone and the ascending zone of the hydrolysis acidification zone, and improving the hydrolysis acidification reaction efficiency.

[0049] In the first aspect of the present invention, as a preferred embodiment, the anoxic zone 3000 is divided into a first anoxic zone 301, a second anoxic zone 302, and a third anoxic zone 303, and the first anoxic zone 301, the second anoxic zone 302, and the third anoxic zone 303 are all provided with anoxic agitators 304. The first anoxic zone 301, the second anoxic zone 302, and the third anoxic zone 303 can all be provided with fillers and agitators in all or part of the areas as needed, which can increase the concentration of microorganisms and improve the denitrification efficiency of heterotrophic denitrifying bacteria.

[0050] Specifically, regarding the anoxic zone return pipeline 403, an anoxic zone return pipeline 403 for returning a nitrate-rich mixed solution is set at the bottom of the aerobic zone to return the nitrate to the anoxic zone and convert it into nitrogen N2 through the action of heterotrophic denitrifying bacteria.

[0051] In some embodiments of the present invention, a matching reagent storage and dosing system is also included. The dosing system is connected to the sulfur autotrophic denitrification zone 101 to provide inorganic salts required for the metabolism of autotrophic microorganisms.

[0052] In the first aspect of the present invention, as a preferred embodiment, the aerobic zone 4000 is further provided with a sludge discharge and phosphorus removal pipeline 404. After the sludge after the phosphorus accumulating bacteria in the aerobic zone absorb a large amount of phosphorus, part of the sludge is discharged from the system through the sludge discharge system after sedimentation, thereby achieving the purpose of phosphorus removal.

[0053] In the first aspect of the present invention, as a preferred embodiment, when treating wastewater, a certain proportion of pyrite can be embedded into the sulfur autotrophic denitrification zone filler 201 and filler 202 as needed, and the denitrifying bacteria can also use pyrite as an electron donor for autotrophic denitrification.

[0054] In the first aspect of the present invention, as a preferred embodiment, it also includes a matching air blowing system, which is connected to the aerator installed at the bottom of the aerobic zone to provide oxygen required for the metabolism of aerobic microorganisms.

[0055] Please refer to Figure 6 The second aspect of the present invention provides a sulfur autotrophic coupled hydrolysis acidification enhanced low carbon-nitrogen ratio wastewater denitrification and carbon removal system treatment process, comprising the following steps:

[0056] Step S10: Add reduced sulfur medium into the sulfur autotrophic denitrification zone, and the wastewater enters the sulfur autotrophic denitrification zone through the water inlet, fully reacts with the sulfur autotrophic filler component, and passes through the sulfur autotrophic descending zone and the sulfur autotrophic ascending zone in sequence;

[0057] Step S20: the wastewater passing through the sulfur autotrophic denitrification zone flows into the hydrolysis acidification descending zone and the hydrolysis acidification ascending zone in sequence, and fully reacts with the hydrolysis acidification filler components, so that the hydrolysis acidification bacteria are fully in contact with the difficult-to-degrade organic matter and macromolecular organic matter in the wastewater, and the difficult-to-degrade organic matter is hydrolyzed into small-molecule organic matter by the microbial extracellular enzyme, and the small-molecule organic matter is further converted into easily biodegradable substances such as volatile fatty acids under the action of acidification bacteria;

[0058] Step S30: the wastewater passing through the hydrolysis and acidification zone flows into the anoxic zone, and the denitrifying bacteria, as heterotrophic microorganisms, utilize the oxygen of the nitrate in the mixed liquor refluxed from the aerobic zone as an electron acceptor and the easily degradable organic matter brought from the hydrolysis and acidification zone as an electron donor to reduce the nitrite nitrogen and nitrate nitrogen into gaseous nitrogen;

[0059] Step S40: The wastewater passing through the anoxic zone flows into the aerobic zone. The wastewater completes the excessive phosphorus uptake by polyphosphate bacteria and the ammonia nitrogen nitrification process by nitrifying bacteria in the aerobic pool. Biological phosphorus removal is completed by discharging phosphorus-rich sludge, and nitrate nutrients are provided for the subsequent heterotrophic nitrogen removal unit in the anoxic zone.

[0060] In the second aspect of the present invention, as a preferred embodiment, in the step S10, when "reduced sulfur medium is added to the sulfur autotrophic denitrification zone, wastewater enters the sulfur autotrophic denitrification zone through the water inlet, fully reacts with the sulfur autotrophic filler component, and passes through the sulfur autotrophic descending zone and the sulfur autotrophic ascending zone in sequence", an agitator is used in the ascending zone to form a circulating flow in the sulfur autotrophic denitrification zone.

[0061] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A sulfur autotrophic coupled hydrolysis acidification enhanced low carbon-nitrogen ratio wastewater denitrification and carbon removal system, characterized in that: It includes a sulfur autotrophic denitrification zone, a hydrolysis acidification zone, an anoxic zone, an aerobic zone, and a reduced sulfur medium, wherein the reduced sulfur medium is added into the sulfur autotrophic denitrification zone, the sulfur autotrophic denitrification zone is provided with a water inlet, the sulfur autotrophic denitrification zone is divided into a sulfur autotrophic descending zone and a sulfur autotrophic ascending zone which are interconnected, the water inlet is sequentially connected with the sulfur autotrophic descending zone and the sulfur autotrophic ascending zone, and a sulfur autotrophic filler component is provided along the upper half of the sulfur autotrophic denitrification zone; The hydrolysis and acidification zone is divided into a hydrolysis and acidification descending zone and a hydrolysis and acidification ascending zone which are interconnected, the hydrolysis and acidification descending zone is connected to the sulfur autotrophic ascending zone, and a hydrolysis and acidification filler assembly is arranged along the upper part of the hydrolysis and acidification zone; The anoxic zone is communicated with the hydrolysis acidification ascending zone and the aerobic zone respectively. The aerobic zone is provided with an aerator along the bottom. The aerobic zone is provided with a water outlet and an anoxic zone reflux pipeline connected to the anoxic zone along the side.

2. The sulfur autotrophic coupled hydrolysis acidification enhanced low carbon-nitrogen ratio wastewater denitrification and carbon removal system according to claim 1, characterized in that: The sulfur autotrophic descending filler includes a sulfur autotrophic descending filler and a sulfur autotrophic ascending filler. The sulfur autotrophic descending filler is arranged in the sulfur autotrophic descending zone, and the sulfur autotrophic ascending filler is arranged in the sulfur autotrophic ascending zone.

3. The sulfur autotrophic coupled hydrolysis acidification enhanced low carbon-nitrogen ratio wastewater denitrification and carbon removal system according to claim 2, characterized in that: A sulfur autotrophic partition is arranged between the sulfur autotrophic descending zone and the sulfur autotrophic ascending zone. The sulfur autotrophic partition is located at the upper part of the sulfur autotrophic denitrification zone, so that the lower parts of the sulfur autotrophic descending zone and the sulfur autotrophic ascending zone are connected.

4. The sulfur autotrophic coupled hydrolysis acidification enhanced low carbon-nitrogen ratio wastewater denitrification and carbon removal system according to claim 3, characterized in that: The sulfur autotrophic ascending zone is provided with a sulfur autotrophic ascending stirring component.

5. The sulfur autotrophic coupled hydrolysis acidification enhanced low carbon-nitrogen ratio wastewater denitrification and carbon removal system according to claim 1, characterized in that: The hydrolysis acidification filler assembly includes a hydrolysis acidification descending filler and a hydrolysis acidification ascending filler. The hydrolysis acidification descending filler is arranged in the hydrolysis acidification descending zone, and the hydrolysis acidification ascending filler is arranged in the hydrolysis acidification ascending zone.

6. The sulfur autotrophic coupled hydrolysis acidification enhanced low carbon-nitrogen ratio wastewater denitrification and carbon removal system according to claim 5, characterized in that: A hydrolysis acidification partition is provided between the hydrolysis acidification descending zone and the hydrolysis acidification ascending zone. The hydrolysis acidification partition is located at the upper part of the hydrolysis acidification zone, so that the lower parts of the hydrolysis acidification descending zone and the hydrolysis acidification ascending zone are connected.

7. The sulfur autotrophic coupled hydrolysis acidification enhanced low carbon-nitrogen ratio wastewater denitrification and carbon removal system according to claim 6, characterized in that: The hydrolysis acidification descending zone and the hydrolysis acidification ascending zone are both provided with a hydrolysis acidification stirrer.

8. The sulfur autotrophic coupled hydrolysis acidification enhanced low carbon-nitrogen ratio wastewater denitrification and carbon removal system according to claim 1, characterized in that: The anoxic zone is divided into a first anoxic zone, a second anoxic zone, and a third anoxic zone, and the first anoxic zone, the second anoxic zone, and the third anoxic zone are all provided with anoxic stirrers.

9. The sulfur autotrophic coupled hydrolysis acidification enhanced low carbon-nitrogen ratio wastewater denitrification and carbon removal system according to claim 1, characterized in that: The aerobic zone is also provided with a sludge removal and phosphorus removal pipeline.

10. A treatment process for sulfur autotrophic coupled hydrolysis acidification enhanced low carbon-nitrogen ratio wastewater denitrification and carbon removal system according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step S10: Add reduced sulfur medium into the sulfur autotrophic denitrification zone, and the wastewater enters the sulfur autotrophic denitrification zone through the water inlet, fully reacts with the sulfur autotrophic filler component, and passes through the sulfur autotrophic descending zone and the sulfur autotrophic ascending zone in sequence; Step S20: the wastewater passing through the sulfur autotrophic denitrification zone flows into the hydrolysis acidification descending zone and the hydrolysis acidification ascending zone in sequence, and fully reacts with the hydrolysis acidification filler components, so that the hydrolysis acidification bacteria are fully in contact with the difficult-to-degrade organic matter and macromolecular organic matter in the wastewater, and the difficult-to-degrade organic matter is hydrolyzed into small-molecule organic matter by the microbial extracellular enzyme, and the small-molecule organic matter is further converted into easily biodegradable substances such as volatile fatty acids under the action of acidification bacteria; Step S30: the wastewater passing through the hydrolysis and acidification zone flows into the anoxic zone, and the denitrifying bacteria, as heterotrophic microorganisms, utilize the oxygen of the nitrate in the mixed liquor refluxed from the aerobic zone as an electron acceptor and the easily degradable organic matter brought from the hydrolysis and acidification zone as an electron donor to reduce the nitrite nitrogen and nitrate nitrogen into gaseous nitrogen; Step S40: The wastewater passing through the anoxic zone flows into the aerobic zone. The wastewater completes the excessive phosphorus uptake by polyphosphate bacteria and the ammonia nitrogen nitrification process by nitrifying bacteria in the aerobic pool. Biological phosphorus removal is completed by discharging phosphorus-rich sludge, and nitrate nutrients are provided for the subsequent heterotrophic nitrogen removal unit in the anoxic zone.

11. The process according to claim 10, characterized in that In the step S10, when "reduced sulfur medium is added to the sulfur autotrophic denitrification zone, wastewater enters the sulfur autotrophic denitrification zone through the water inlet, fully reacts with the sulfur autotrophic filler component, and passes through the sulfur autotrophic descending zone and the sulfur autotrophic ascending zone in sequence", an agitator is used in the ascending zone to form a circulating flow in the sulfur autotrophic denitrification zone.

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