Modular microbial coupled low carbon-to-nitrogen ratio sewage treatment system and treatment method

Abstract

The application discloses a modular microbial coupled low carbon-nitrogen ratio sewage treatment system and a treatment method. The treatment system comprises an anoxic zone, an anaerobic zone and an aerobic zone. The anoxic zone is provided with solidified short-cut nitrification sludge. The anaerobic zone is provided with solidified denitrification sludge and solidified anaerobic ammonia oxidation sludge. The aerobic zone is provided with solidified short-cut nitrification sludge and solidified nitrifying bacteria. The sewage treatment method is to pass sewage through the anoxic zone, the anaerobic zone and the aerobic zone. The sewage treatment system solidifies sludge and bacteria. The system can be quickly started, efficient nitrogen removal is realized, and the treatment efficiency is significantly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a modular microbial coupled low carbon nitrogen ratio sewage treatment system and treatment method, belonging to the technical field of water treatment. BACKGROUND

[0002] With the continuous improvement of people's living standards, the amount of wastewater generated by production and business activities also gradually increases, and direct discharge of substandard treatment will cause serious damage to the ecological environment. At present, the traditional nitrification and denitrification can effectively remove COD and ammonia nitrogen and other pollutants when the carbon nitrogen ratio (C / N ratio) is greater than 10. However, most of the wastewater, especially kitchen wastewater, landfill leachate, pharmaceutical and aquaculture wastewater, usually has high ammonia nitrogen and low COD, and the C / N ratio is between 1 and 10.

[0003] With the continuous improvement of wastewater treatment industry standards, the deep treatment of low C / N ratio wastewater such as livestock wastewater, landfill leachate, toilet wastewater, and pharmaceutical wastewater has become an important challenge faced by the wastewater treatment industry. The traditional nitrification and denitrification wastewater treatment process requires the addition of a large amount of carbon source, and the treatment cost is high. Through autotrophic denitrification treatment, the operating cost can be reduced, but the autotrophic microorganisms grow slowly, have poor impact resistance, and are difficult to maintain long-term operation stability. Moreover, the traditional activated sludge method is prone to loss of microorganisms, and the return of nitrification liquid and sludge will affect the bacterial community structure and the stability of the treatment process. Frequent addition of carbon source leads to the proliferation of heterotrophic bacteria, making autotrophic bacteria in a disadvantaged ecological niche, and ultimately leading to unstable treatment process and poor impact resistance. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, the first object of the present application is to provide a modular microbial coupled low carbon nitrogen ratio sewage treatment system, which solidifies the sludge and bacteria, can quickly start, realizes efficient denitrification, and significantly improves the treatment efficiency.

[0005] The second object of the present application is to provide a modular microbial coupled low carbon nitrogen ratio sewage treatment method, which uses immobilized sludge and bacteria to treat wastewater, and has high efficiency and good durability.

[0006] The first object of the present application can be achieved by adopting the following technical scheme: a modular microbial coupled low carbon nitrogen ratio sewage treatment system, comprising an anoxic zone, an anaerobic zone and an aerobic zone; the anoxic zone is provided with immobilized short-cut nitrification sludge; the anaerobic zone is provided with immobilized denitrification sludge and immobilized anaerobic ammonia oxidation sludge; and the aerobic zone is provided with immobilized short-cut nitrification sludge and immobilized nitrifying bacteria.

[0007] Further, the filling volume percentage of the short-cut nitrification sludge in the anoxic zone is 20-55%.

[0008] Further, the volume ratio of the solidified denitrification sludge and the solidified anaerobic ammonia oxidation sludge in the anaerobic zone is (10-2):1; the total filling volume percentage of the solidified denitrification sludge and the solidified anaerobic ammonia oxidation sludge in the anaerobic zone is 20-55%.

[0009] Further, the volume ratio of the solidified shortcut nitrification sludge and the solidified nitrifying bacteria in the aerobic zone is (5-8):1; the total filling volume percentage of the solidified shortcut nitrification sludge and the solidified nitrifying bacteria in the aerobic zone is 15-45%.

[0010] Further, the volume ratio of the solidified denitrification sludge and the solidified anaerobic ammonia oxidation sludge in the anaerobic zone is 3:1.

[0011] Further, the volume ratio of the solidified shortcut nitrification sludge and the solidified nitrifying bacteria in the aerobic zone is 6:1.

[0012] Further, the filling volume percentage of the shortcut nitrification sludge in the anoxic zone is 50%; the total filling volume percentage of the solidified denitrification sludge and the solidified anaerobic ammonia oxidation sludge in the anaerobic zone is 40%; the total filling volume percentage of the solidified shortcut nitrification sludge and the solidified nitrifying bacteria in the aerobic zone is 30%.

[0013] Further, the solidified shortcut nitrification sludge comprises a solidified substrate, an auxiliary agent and the shortcut nitrification sludge; the solidified denitrification sludge comprises a solidified substrate, an auxiliary agent and the denitrification sludge; the solidified anaerobic ammonia oxidation sludge comprises a solidified substrate, an auxiliary agent and the anaerobic ammonia oxidation sludge; the solidified nitrifying bacteria comprises a solidified substrate, an auxiliary agent and the nitrifying bacteria.

[0014] Further, the auxiliary agent in the solidified denitrification sludge comprises at least one of sulfur, pyrite and calcium carbonate; the auxiliary agent in the solidified anaerobic ammonia oxidation sludge, the solidified shortcut nitrification sludge and the solidified nitrifying bacteria comprises at least one of diatomite, fly ash, modified activated carbon and silicon dioxide.

[0015] Further, the anoxic zone is further provided with a supernatant of the shortcut nitrification sludge; the anaerobic zone is further provided with a supernatant of the denitrification sludge and a supernatant of the anaerobic ammonia oxidation sludge; the aerobic zone is further provided with a supernatant of the shortcut nitrification sludge and a culture solution of the nitrifying bacteria.

[0016] The second object of the present application can be achieved by adopting the following technical solution: a modularized microbial coupled low carbon-nitrogen ratio sewage treatment method, wherein sewage is sequentially passed through an anoxic zone, an anaerobic zone and an aerobic zone; the anoxic zone is provided with solidified shortcut nitrification sludge; the anaerobic zone is provided with solidified denitrification sludge and solidified anaerobic ammonia oxidation sludge; and the aerobic zone is provided with solidified shortcut nitrification sludge and solidified nitrifying bacteria.

[0017] Further, the sewage is sequentially passed through the anaerobic zone, the anoxic zone and the aerobic zone.

[0018] Compared with the prior art, the present application has the beneficial effects that:

[0019] 1、The system of the present application is especially suitable for wastewater with a carbon-nitrogen ratio of less than 5, can be quickly started, realizes efficient denitrification, significantly improves the treatment efficiency, reduces sludge production, improves the effluent quality, and further improves the economic benefit;

[0020] 2、The system of the present application solves the problems of the traditional treatment system, such as the need for external carbon source, low efficiency, high cost, etc., and greatly reduces the instability and large loss of microbial colonies in a solidified manner, greatly improves the stability, has strong impact resistance, and has good sludge-water separation effect;

[0021] 3、The system of the present application solidifies the sludge and bacteria, and the usage ratio is easy to control, and the use is more flexible;

[0022] 4、The method of the present application uses the method of immobilized sludge and bacteria for treatment, has a high biomass concentration, and provides an internal stable proliferation space and site, and the biomass will not change the microbial community structure due to the flow of sewage and the backflow of nitrification liquid, solves the problems of slow microbial proliferation and easy loss of low C / N ratio wastewater, and thus the treatment is more efficient and stable. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 To solidify short-cut nitrification sludge;

[0024] Figure 2 To solidify denitrification sludge;

[0025] Figure 3 To solidify anaerobic ammonia oxidation sludge;

[0026] Figure 4 To solidify nitrifying bacteria;

[0027] Figure 5 The flow chart of Example 2;

[0028] Figure 6 The nitrogen form change trend chart of Example 2;

[0029] Figure 7 The removal rate trend chart of Example 2;

[0030] Figure 8 The water quality change chart of Example 2;

[0031] Figure 9 The flow chart of Example 3;

[0032] Figure 10 The nitrogen form change trend chart of Example 3;

[0033] Figure 11Removal rate trend chart for Example 3;

[0034] Figure 12 Water quality change chart for Example 3;

[0035] Figure 13 Flow chart for Example 4;

[0036] Figure 14 Trend chart for nitrogen form change for Example 4;

[0037] Figure 15 Removal rate trend chart for Example 4;

[0038] Figure 16 Water quality change chart for Example 4;

[0039] Figure 17 Removal rate of NH4 + -N for Comparative Example 1;

[0040] Figure 18 Removal rate of TN for Comparative Example 1;

[0041] Figure 19 Removal rate of COD for Comparative Example 1. DETAILED DESCRIPTION

[0042] The application will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0043] A modular microbial-coupled low-carbon-nitrogen-ratio sewage treatment system comprises an anoxic zone, an anaerobic zone and an aerobic zone;

[0044] The anoxic zone is provided with immobilized short-cut nitrification sludge; the filling volume percentage of the short-cut nitrification sludge is 20-55%; the remaining volume is filled with supernatant of the short-cut nitrification sludge;

[0045] The anaerobic zone is provided with immobilized denitrification sludge and immobilized anaerobic ammonia oxidation sludge; the volume ratio of the immobilized denitrification sludge to the immobilized anaerobic ammonia oxidation sludge is (2-10):1; the total filling volume percentage of the immobilized denitrification sludge and the immobilized anaerobic ammonia oxidation sludge is 20-55%; the remaining volume is filled with supernatant of the denitrification sludge and supernatant of the anaerobic ammonia oxidation sludge;

[0046] The aerobic zone is provided with immobilized short-cut nitrification sludge and immobilized nitrifying bacteria; the volume ratio of the immobilized short-cut nitrification sludge to the immobilized nitrifying bacteria is (5-8):1; the total filling volume percentage of the immobilized short-cut nitrification sludge and the immobilized nitrifying bacteria is 15-45%; the remaining volume is filled with supernatant of the short-cut nitrification sludge and culture solution of the nitrifying bacteria.

[0047] The solidified short-cut nitrification sludge comprises a solidification matrix, an auxiliary agent, and the short-cut nitrification sludge; the auxiliary agent comprises at least one of diatomite, fly ash, modified activated carbon, and silicon dioxide; the addition of activated carbon, diatomite, etc. can increase the mass transfer performance of the material, which is conducive to the sedimentation of a small part of the generated sludge and improves the sludge-water separation effect; the solidified denitrification sludge comprises a solidification matrix, an auxiliary agent, and the denitrification sludge; the auxiliary agent comprises at least one of sulfur, pyrite, and calcium carbonate; the auxiliary agent containing sulfur in a reduced state, such as sulfur and pyrite, is mainly used to provide electrons for sulfur autotrophic denitrification and nitrogen removal in the case of insufficient carbon source; the solidified anaerobic ammonia oxidation sludge comprises a solidification matrix, an auxiliary agent, and the anaerobic ammonia oxidation sludge; the auxiliary agent comprises at least one of diatomite, fly ash, modified activated carbon, and silicon dioxide; the addition of activated carbon, diatomite, etc. can increase the mass transfer performance of the material, which is conducive to the sedimentation of a small part of the generated sludge and improves the sludge-water separation effect.

[0048] The solidified nitrifying bacteria comprise a solidification matrix, an auxiliary agent, and the nitrifying bacteria; the auxiliary agent comprises at least one of diatomite, fly ash, modified activated carbon, and silicon dioxide; the addition of activated carbon, diatomite, etc. can increase the mass transfer performance of the material, which is conducive to the sedimentation of a small part of the generated sludge and improves the sludge-water separation effect.

[0049] The solidification matrixes described above each comprise at least one of polyethylene glycol methyl ether methacrylate, polyethylene glycol dimethacrylate, and polyethylene glycol diacrylate.

[0050] A modular microbial-coupled low-carbon-nitrogen-ratio sewage treatment method is provided, which is used for treating sewage through the system described above: the sewage is treated through an anoxic zone, an anaerobic zone, and an aerobic zone.

[0051] Embodiment 1

[0052] The preparation steps of the solidified short-cut nitrification sludge are as follows:

[0053] Mixing: the short-cut nitrification sludge, 8% of the sludge mass percentage of polyethylene glycol diacrylate, and 1% of the sludge mass percentage of diatomite (200 mesh) are mixed to obtain a mixed solution;

[0054] The solidification step: 0.5% of the sludge mass percentage of N,N,N',N'-tetramethyl ethylenediamine (a crosslinking agent) and 0.5% of the sludge mass percentage of potassium persulfate (an initiator) are added to the mixed solution to obtain a solution to be solidified, the solution to be solidified is solidified and shaped, cut into a square block with a size of 3-5 mm, and the solidified short-cut nitrification sludge is obtained, as shown in Figure 1 .

[0055] The preparation steps of the solidified denitrification sludge are as follows:

[0056] Mixing: denitrifying sludge, 6% of polyethylene glycol diacrylate by mass percentage of sludge, 5% of sulfur powder by mass percentage of sludge, 5% of pyrite powder (100 mesh) by mass percentage of sludge, 10% of CaCO3 powder by mass percentage of sludge were mixed to obtain a mixed solution;

[0057] Solidification step: 0.5% of N, N, N', N'-tetramethyl ethylenediamine (crosslinking agent) by mass percentage of sludge and 0.5% of potassium persulfate (initiator) by mass percentage of sludge were added to the mixed solution to obtain a solution to be solidified, the solution to be solidified was solidified and molded, and was cut into a square shape with a size of 3-5 mm to obtain solidified denitrifying sludge, as shown in Figure 2

[0058] Preparation step of solidified anaerobic ammonia oxidation sludge:

[0059] Mixing: anaerobic ammonia oxidation sludge, 10% of polyethylene glycol diacrylate by mass percentage of sludge, and 1% of coconut shell activated carbon (200 mesh) by mass percentage of sludge were mixed to obtain a mixed solution;

[0060] Solidification step: 0.5% of N, N, N', N'-tetramethyl ethylenediamine (crosslinking agent) by mass percentage of sludge and 0.5% of potassium persulfate (initiator) by mass percentage of sludge were added to the mixed solution to obtain a solution to be solidified, the solution to be solidified was solidified and molded, and was cut into a square shape with a size of 3-5 mm to obtain solidified anaerobic ammonia oxidation sludge, as shown in Figure 3

[0061] Preparation step of solidified nitrifying bacteria:

[0062] Mixing: nitrifying bacteria (Vitreoscilla nitrifyng bacteria, accession number: ATCC 25391, existing) were inoculated into a nitrification medium, and cultured at 30°C and 200 rpm for 72 h, and then 10% of polyethylene glycol diacrylate by mass percentage of the medium and 1% of diatomite (200 mesh) by mass percentage of the medium were mixed to obtain a mixed solution; the composition of the nitrification medium is shown in Table 1:

[0063] Table 1 Composition of nitrification medium

[0064]

[0065]

[0066] Solidification step: 0.5% of N, N, N', N'-tetramethyl ethylenediamine (crosslinking agent) by mass percentage of the medium and 0.5% of potassium persulfate (initiator) by mass percentage of the medium were added to the mixed solution to obtain a solution to be solidified, the solution to be solidified was solidified and molded, and was cut into a square shape with a size of 3-5 mm to obtain solidified nitrifying bacteria, as shown in Figure 4 .​​

[0067] Example 2

[0068] The biogas waste liquid of a pig farm mainly has low C / N, very low COD after entering the anaerobic treatment, poor biodegradability, the main form of nitrogen is ammonia nitrogen (NH4 + -N), low microbial diversity and abundance in the biogas waste, which leads to difficult start. The system for realizing efficient denitrification in this embodiment is as follows:

[0069] A modular microbial coupled low carbon-nitrogen ratio sewage treatment system, comprising an anoxic zone 2L, an anaerobic zone 3L, an aerobic zone 1L, and a sedimentation tank 1 / 3L, the system takes in water from the bottom, and the water sequentially passes through the anoxic zone, the anaerobic zone, the aerobic zone, and the sedimentation tank, and is discharged from the top, and a flow chart is shown in Figure 5 ;

[0070] The wastewater is taken from the effluent of a biogas tank of a pig farm, and the specific parameters are shown in Table 2:

[0071] Table 2: Parameter indexes of pig biogas waste

[0072]

[0073]

[0074] The anoxic zone is provided with immobilized short-cut nitrification sludge; the filling volume percentage of the short-cut nitrification sludge is 50%; the remaining volume is filled with supernatant of the short-cut nitrification sludge;

[0075] The anaerobic zone is provided with immobilized denitrification sludge and immobilized anaerobic ammonia oxidation sludge; the volume ratio of the immobilized denitrification sludge and the immobilized anaerobic ammonia oxidation sludge is 3:1; the total filling volume percentage of the immobilized denitrification sludge and the immobilized anaerobic ammonia oxidation sludge is 40%; the remaining volume is filled with supernatant of the denitrification sludge and supernatant of the anaerobic ammonia oxidation sludge;

[0076] The aerobic zone is provided with immobilized short-cut nitrification sludge and immobilized nitrifying bacteria; the volume ratio of the immobilized short-cut nitrification sludge and the immobilized nitrifying bacteria is 6:1; the total filling volume percentage of the immobilized short-cut nitrification sludge and the immobilized nitrifying bacteria is 30%; the remaining volume is filled with supernatant of the short-cut nitrification sludge and culture solution of the nitrifying bacteria.

[0077] The water inlet is opened, the total hydraulic retention time is about 3 days, the system is continuously operated for 80 days, and the removal rates of COD, NH4 + -N and TN are regularly detected. In addition, the change of the form of nitrogen in the reactor is detected as shown in Figure 6 , the removal rates are shown in Figure 7 , and the changes of the water quality before and after the treatment are shown in Figure 8 .

[0078] Example 3

[0079] A modular microbial coupled low carbon nitrogen ratio sewage treatment system, comprising an anaerobic zone 1L, an anoxic zone 4L, an aerobic zone 1L, a sedimentation tank 1 / 3L, the system is fed from the bottom, sequentially through the anaerobic zone, the anoxic zone, the aerobic zone, the sedimentation tank, and the top water is discharged, the flow chart is shown as Figure 9 ;

[0080] The experimental water is the same as that in Example 2.

[0081] The anoxic zone is provided with solidified short-cut nitrification sludge; the filling volume percentage of the short-cut nitrification sludge is 50%; the remaining volume is filled with supernatant of the short-cut nitrification sludge;

[0082] The anaerobic zone is provided with solidified denitrification sludge and solidified anaerobic ammonia oxidation sludge; the volume ratio of the solidified denitrification sludge and the solidified anaerobic ammonia oxidation sludge is 8:1; the total filling volume percentage of the solidified denitrification sludge and the solidified anaerobic ammonia oxidation sludge is 35%; the remaining volume is filled with supernatant of the denitrification sludge and supernatant of the anaerobic ammonia oxidation sludge;

[0083] The aerobic zone is provided with solidified short-cut nitrification sludge and solidified nitrifying bacteria; the volume ratio of the solidified short-cut nitrification sludge and the solidified nitrifying bacteria is 7:1; the total filling volume percentage of the solidified short-cut nitrification sludge and the solidified nitrifying bacteria is 30%; the remaining volume is filled with supernatant of the short-cut nitrification sludge and culture solution of the nitrifying bacteria.

[0084] The water inlet is opened, the total hydraulic retention time is about 3 days, the continuous operation is 80 days, and the removal rates of COD, NH4 + -N and TN are regularly detected. In addition, the change of the form of nitrogen in the reactor is detected, as shown in Figure 10 , the removal rate is as shown in Figure 11 , and the change of water quality before and after the water inlet is as shown in Figure 12 .

[0085] Example 4:

[0086] Landfill leachate is generally high in COD, high in NH4 + -N, and low in C / N ratio, resulting in poor treatment effect of traditional processes, and the need for additional carbon source.

[0087] The system of this embodiment is as follows:

[0088] A modular microbial coupled low carbon nitrogen ratio sewage treatment system, comprising a conditioning tank, an anaerobic zone 2L, an anoxic zone 3L, an aerobic zone 1L, a sedimentation tank 1 / 3L, the system is fed from the bottom, sequentially through the conditioning tank, the anaerobic zone, the anoxic zone, the aerobic zone, the sedimentation tank, and the top water is discharged, the flow chart is shown as Figure 13 ;

[0089] The landfill leachate from the original water of a primary school is collected at a garbage collection station, and the specific parameters are shown in Table 3.

[0090] Table 3 Landfill leachate parameter indicators

[0091]

[0092]

[0093] The anoxic zone is provided with immobilized short-cut nitrification sludge; the filling volume percentage of the short-cut nitrification sludge is 40%; the remaining volume is filled with supernatant of the short-cut nitrification sludge;

[0094] The anaerobic zone is provided with immobilized denitrification sludge and immobilized anaerobic ammonia oxidation sludge; the volume ratio of the immobilized denitrification sludge and the immobilized anaerobic ammonia oxidation sludge is 4:1; the total filling volume percentage of the immobilized denitrification sludge and the immobilized anaerobic ammonia oxidation sludge is 50%; the remaining volume is filled with supernatant of the denitrification sludge and supernatant of the anaerobic ammonia oxidation sludge;

[0095] The aerobic zone is provided with immobilized short-cut nitrification sludge and immobilized nitrifying bacteria; the volume ratio of the immobilized short-cut nitrification sludge and the immobilized nitrifying bacteria is 7:1; the total filling volume percentage of the immobilized short-cut nitrification sludge and the immobilized nitrifying bacteria is 30%; the remaining volume is filled with supernatant of the short-cut nitrification sludge and culture solution of the nitrifying bacteria.

[0096] Start the water inlet, the total hydraulic retention time is about 10 days, and the continuous operation is 90 days. The removal rates of COD, NH4 + -N and TN are detected regularly. In addition, the changes in the forms of nitrogen in the reactor are detected, and the removal rates are shown in Table 2, the changes in the water quality before and after the treatment are shown in Table 3. Figure 14 Figure 15 Figure 16

[0097] Chemical oxygen demand (COD) is detected by the dichromate method (HJ 828-2017), ammonia nitrogen (NH4 + -N) is detected by the salicylic acid spectrophotometric method (HJ 536-2009), nitrite nitrogen (NO3 - -N) is detected by the spectrophotometric method (GB 7493-87), nitrate nitrogen is detected by the ultraviolet spectrophotometric method (HJ / T 346-2007), and total nitrogen (TN) is detected by the alkaline potassium persulfate digestion ultraviolet spectrophotometric method (HJ 636-2012).

[0098] Comparative Example:

[0099] The immobilized short-cut nitrification sludge, the immobilized denitrification sludge, the immobilized anaerobic ammonia oxidation sludge and the immobilized nitrifying bacteria obtained by the method of Example 1 are not used in the comparative example; traditional non-immobilized sludge and bacteria are used; the remaining settings and treatment processes of the system are the same as those of Example 2. ​​​

[0100] The water quality after the treatment of Example 2 and the comparative example was compared: NH4 + The removal rate of N was as shown in Table 2, the removal rate of TN was as shown in Table 3, and the removal rate of COD was as shown in Table 4. Figure 17 The removal rate of N was as shown in Table 2, the removal rate of TN was as shown in Table 3, and the removal rate of COD was as shown in Table 4. Figure 18 The removal rate of N was as shown in Table 2, the removal rate of TN was as shown in Table 3, and the removal rate of COD was as shown in Table 4. Figure 19 The removal rate of N was as shown in Table 2, the removal rate of TN was as shown in Table 3, and the removal rate of COD was as shown in Table 4.

[0101] For those skilled in the art, other various corresponding changes and modifications can be made according to the technical solutions and concepts described above, and all of these changes and modifications shall belong to the protection scope of the claims of the present application.

Claims

1. A modular low carbon to nitrogen ratio sewage treatment system coupled with microorganisms, characterized in that, The system comprises an anoxic zone, an anaerobic zone and an aerobic zone; the anoxic zone is provided with immobilized short-cut nitrification sludge; the anaerobic zone is provided with immobilized denitrification sludge and immobilized anaerobic ammonia oxidation sludge; the aerobic zone is provided with immobilized short-cut nitrification sludge and immobilized nitrifying bacteria; The immobilized short-cut nitrification sludge comprises an immobilization matrix, an auxiliary agent and short-cut nitrification sludge; The immobilized denitrification sludge comprises an immobilization matrix, an auxiliary agent and denitrification sludge; The immobilized anaerobic ammonia oxidation sludge comprises an immobilization matrix, an auxiliary agent and anaerobic ammonia oxidation sludge; The auxiliary agent in the immobilized denitrification sludge comprises at least one of sulfur, pyrite and calcium carbonate; the auxiliary agent in the immobilized anaerobic ammonia oxidation sludge, the immobilized short-cut nitrification sludge and the immobilized nitrifying bacteria comprises at least one of diatomite, fly ash, modified activated carbon and silicon dioxide; the anoxic zone is further provided with supernatant of short-cut nitrification sludge; the anaerobic zone is further provided with supernatant of denitrification sludge and supernatant of anaerobic ammonia oxidation sludge; the aerobic zone is further provided with supernatant of short-cut nitrification sludge and nitrifying bacteria culture solution.

2. The modular low carbon to nitrogen ratio sewage treatment system coupled with microorganisms as claimed in claim 1 wherein, The immobilized short-cut nitrification sludge in the anoxic zone has a filling volume percentage of 20-55%.

3. The modular low carbon to nitrogen ratio sewage treatment system coupled with microorganisms as claimed in claim 1 wherein, The volume ratio of the immobilized denitrification sludge to the immobilized anaerobic ammonia oxidation sludge in the anaerobic zone is (2-10):1; The total filling volume percentage of the immobilized denitrification sludge and the immobilized anaerobic ammonia oxidation sludge in the anaerobic zone is 20-55%.

4. The modular low carbon to nitrogen ratio sewage treatment system coupled with microorganisms as claimed in claim 1 wherein, The volume ratio of the immobilized short-cut nitrification sludge to the immobilized nitrifying bacteria in the aerobic zone is (5-8):1; the total filling volume percentage of the immobilized short-cut nitrification sludge and the immobilized nitrifying bacteria in the aerobic zone is 15-45%.

5. The modular low carbon to nitrogen ratio sewage treatment system coupled with microorganisms as claimed in claim 1 wherein, The filling volume percentage of the immobilized short-cut nitrification sludge in the anoxic zone is 50%; The total filling volume percentage of the immobilized denitrification sludge and the immobilized anaerobic ammonia oxidation sludge in the anaerobic zone is 40%; The total filling volume percentage of the immobilized short-cut nitrification sludge and the immobilized nitrifying bacteria in the aerobic zone is 30%.

6. A process for the treatment of low carbon to nitrogen ratio sewage by modular microbial coupling, characterized by, The low-carbon-nitrogen-ratio sewage treatment system of any one of claims 1-5 is used to treat sewage through the anoxic zone, the anaerobic zone and the aerobic zone.

7. A process for the treatment of low carbon to nitrogen ratio sewage by modular microbial coupling, characterized by, The low-carbon-nitrogen-ratio sewage treatment system of any one of claims 1-5 is used to treat sewage through the anaerobic zone, the anoxic zone and the aerobic zone in sequence.

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