CN210795914U

CN210795914U - Sewage enhanced denitrification system

Info

Publication number: CN210795914U
Application number: CN201921526375.6U
Authority: CN
Inventors: 王芳; 王科; 倪梁; 方伟东; 沈斌; 顾晓霞; 王学英; 何妍; 卢向忠; 蒋志颖; 吕大伟
Original assignee: Hangzhou Jinyi Construction Group Co ltd
Current assignee: Hangzhou Jinyi Construction Group Co ltd
Priority date: 2019-09-16
Filing date: 2019-09-16
Publication date: 2020-06-19
Anticipated expiration: 2029-09-16

Abstract

The utility model relates to a denitrogenation system is reinforceed to sewage, affiliated sewage treatment technical field, including the sewage inlet pipe, horizontal methanol mixes liquid subassembly and denitrification biological filter case, sewage inlet pipe and horizontal methanol are mixed and are equipped with the medicament setting tank between the liquid subassembly, be equipped with drawing liquid pump I between medicament setting tank and horizontal methanol mixes the liquid subassembly, be equipped with the suction pump between medicament setting tank and sewage feed pipe, be equipped with the sewage feed valve between suction pump and medicament setting tank, denitrification biological filter case is mixed liquid subassembly with horizontal methanol and is equipped with drawing liquid pump II between, drawing liquid pump II is mixed liquid subassembly lower extreme with horizontal methanol and is equipped with the muddy liquid bleeder valve, denitrification biological filter case side is equipped with the active carbon purification pond case, be equipped with drawing liquid pump III between active carbon purification pond and denitrification biological filter case, drawing liquid pump III is equipped with the sewage outlet valve with denitrification biological filter incasement. Has the advantages of high denitrification efficiency, stable effect and low cost. The reuse rate and the water quality of the sewage recovery are improved.

Description

Sewage enhanced denitrification system

Technical Field

The utility model relates to a sewage treatment technical field, concretely relates to denitrogenation system is reinforceed to sewage.

Background

Domestic sewage is wastewater discharged in daily life of residents and mainly comes from residential buildings and public buildings, such as toilets in public places like houses, institutions, schools, hospitals, shops, factories, enterprises and the like. The pollutants contained in the domestic sewage are mainly organic matters (such as protein, carbohydrate, fat, urea, ammonia nitrogen and the like) and a large amount of pathogenic microorganisms (such as parasitic ova, enteroinfectious viruses and the like); organic matters existing in domestic sewage are extremely unstable and are easy to decay to generate stink; bacteria and pathogens propagate in large quantities by taking organic matters in domestic sewage as nutrition, and can cause epidemic of infectious diseases. Therefore, domestic sewage must be treated before being discharged. Total Nitrogen (TN) refers to the total amount of various forms of inorganic and organic nitrogen in water, including inorganic nitrogen such as NO3-, NO 2-and NH4+ and organic nitrogen such as protein, amino acid and organic amine, and is calculated by the nitrogen-containing milligrams per liter of water. Is often used to indicate the degree of nutrient contamination of a body of water. When the nitrogen and phosphorus substances in the surface water exceed the standard, a large amount of microorganisms are propagated, plankton grows vigorously, and a eutrophication state appears.

With the increasing water eutrophication and the stricter discharge standards of domestic sewage and industrial sewage, GB8978-1996 makes clear regulations on the maximum allowable concentration of the second type of pollutants: the first-level discharge standard of ammonia nitrogen is less than 15 mg/L. For the high ammonia nitrogen-containing sewage discharge industry, in order to meet the first-level sewage discharge standard and the above requirements, if the traditional sewage denitrification treatment mode is still used, the following main defects still exist: high economic cost investment, complex process and insufficient denitrification efficiency. The traditional denitrification methods such as A2/O, A/O and the like mainly adopt anaerobic-aerobic or anoxic-aerobic processes as denitrification principles, denitrification is mainly carried out by refluxing nitrified liquid to an anoxic zone, but the traditional denitrification methods have the problems of low denitrification efficiency, unstable effect, high energy consumption and the like.

Disclosure of Invention

The utility model discloses mainly solve and have among the prior art that denitrogenation efficiency is not high, the effect is unstable and with high costs not enough, provide a denitrogenation system is reinforceed to sewage, it has denitrogenation efficient, the effect is stable and advantage with low costs. The reuse rate and the water quality of the sewage recovery are improved.

The above technical problem of the present invention can be solved by the following technical solutions:

the utility model provides a denitrogenation system is reinforceed to sewage, includes sewage inlet pipe, horizontal methanol mixed liquid subassembly and denitrification biological filter case, horizontal methanol mixed liquid subassembly upper end be equipped with horizontal methanol mixed liquid subassembly looks flange formula bolted connection's methyl alcohol inlet pipe, sewage inlet pipe and horizontal methanol mixed liquid subassembly between be equipped with the medicament setting tank that horizontal methanol mixed liquid subassembly looks pipeline intercommunication, medicament setting tank and horizontal methanol mixed liquid subassembly between be equipped with medicament setting tank looks flange joint fixed and with the drawing liquid pump I that horizontal methanol mixed liquid subassembly looks pipeline intercommunication, medicament setting tank and sewage inlet pipe between be equipped with sewage looks flange formula bolted connection's suction pump, suction pump and medicament setting tank between be equipped with the sewage feed valve with medicament setting tank looks pipeline intercommunication, denitrification biological filter case and horizontal methanol mixed liquid subassembly between be equipped with denitrification biological filter looks flange joint fixed and mix liquid subassembly with horizontal methanol and mix liquid subassembly Liquid pump II of looks pipeline intercommunication, liquid pump II and horizontal methyl alcohol mix the liquid subassembly lower extreme within a definite time and be equipped with and mix the liquid bleeder valve, denitrification biological filter case side be equipped with the activated carbon purification pond case of denitrification biological filter case looks pipeline intercommunication, activated carbon purification pond case and denitrification biological filter case within a definite time be equipped with activated carbon purification pond case looks flange joint fixed and with the liquid pump III of denitrification biological filter case looks pipeline intercommunication, liquid pump III and denitrification biological filter case within a definite time be equipped with the sewage outlet valve of denitrification biological filter case looks pipeline intercommunication.

Preferably, the denitrification biological filter tank is provided with a carbon dioxide absorption tank communicated with the denitrification biological filter tank and a phase pipeline, the carbon dioxide absorption tank is provided with a nitrogen collection pressure tank, a nitrogen recovery fan is arranged between the nitrogen collection pressure tank and the carbon dioxide absorption tank, and a gas fan is arranged between the carbon dioxide absorption tank and the denitrification biological filter tank.

Preferably, the carbon dioxide absorption box comprises a carbon dioxide absorption box body, a sodium hydroxide solution is arranged in the carbon dioxide absorption box body, a gas inlet collecting pipe is arranged between the sodium hydroxide solution and the gas fan, a porous exhaust pipe integrally communicated with the gas inlet collecting pipe is arranged at the lower end of the gas inlet collecting pipe, and a nitrogen recovery pipe communicated with a nitrogen recovery fan phase pipeline and sleeved with the carbon dioxide absorption box body is arranged above the sodium hydroxide solution.

Preferably, the horizontal methanol mixed liquid component comprises a stirring tank, a horizontal stirring shaft which extends out of the stirring tank and is in bearing type sealed sleeve joint with the stirring tank is arranged in the stirring tank, a stirring plate frame which is in spiral annular equidistant distribution with the horizontal stirring shaft is arranged on the horizontal stirring shaft, a methanol mixed liquid stirring motor which is in limited sleeve joint with the horizontal stirring shaft is arranged at one end of the horizontal stirring shaft, a stirring shaft limit mounting seat which is in limited sleeve joint with the horizontal stirring shaft is arranged at the other end of the horizontal stirring shaft, a methanol feeding flange pipe which is in flange type bolted connection with the liquid pump I is arranged at the upper end of the stirring tank, a sewage inlet pipe I which is communicated with the stirring tank and is in flange type bolted connection with the methanol is arranged at the side edge of the methanol feeding flange pipe, a mixed liquid outlet pipe which is in flange type bolted connection with a mixed liquid outlet valve is arranged at the lower end of the stirring tank, the lower end of the stirring tank is provided with a horizontal methanol liquid mixing frame which is in embedded welding with the stirring tank.

Preferably, the stirring grillage include the stirring mainboard, stirring mainboard both ends all be equipped with the stirring mainboard looks perpendicular and be the curb plate of integration inlay card, be equipped with between the both sides board and be the perpendicular welded scraper blade of integration with the stirring mainboard.

Preferably, the medicament settling tank comprises a medicament settling tank body, the medicament settling tank body is internally provided with sewage, a vertical stirring shaft which extends to the upper end of the medicament settling tank body and is in bearing type sleeve joint with the medicament settling tank body is arranged in the medicament settling tank body, stirring rods which are integrated with the vertical stirring shaft and are distributed at equal intervals are arranged between the vertical stirring shaft and the sewage, the upper end of the vertical stirring shaft is provided with a medicament stirring motor which is integrated with the vertical stirring shaft and is connected with the medicament sedimentation tank body through a flange type bolt, the side of the medicament stirring motor is provided with a medicament feeding flange pipe and a sewage pumping pipe which are communicated with the medicament sedimentation tank body, the sewage pumping pipe extends to the lower part of the sewage, the lower part of the chemical precipitation box body is provided with a precipitate discharge valve, and a precipitate discharge pipe communicated with the medicament sedimentation tank body is arranged between the precipitate discharge valve and the medicament sedimentation tank body.

Preferably, the denitrification biological filter tank comprises a denitrification biological filter tank body, a plurality of denitrification bacteria filtering biological membranes which are inserted with the denitrification biological filter tank body in a clamping manner are arranged in the denitrification biological filter tank body, and an air inlet pipe which extends to the side edge of the denitrification bacteria filtering biological membranes is arranged above the denitrification biological filter tank body.

As preferred, active carbon purification pond case include active carbon purification pond case body, active carbon purification pond case body upper end be equipped with the inlet tube that is linked together with drawing liquid pump III, active carbon purification pond case body lower part be equipped with the outlet pipe that is linked together with active carbon purification pond case body, outlet pipe terminal surface be equipped with outlet pipe looks sealed flange joint's purification outlet valve, this internal cobblestone layer that is equipped with of active carbon purification pond case, cobblestone layer below be equipped with the gravel layer, gravel layer and cobblestone layer between be equipped with the active carbon layer.

The utility model discloses can reach following effect:

the utility model provides a denitrogenation system is reinforceed to sewage, compare with prior art, have denitrogenation efficient, the effect is stable and advantage with low costs. The reuse rate and the water quality of the sewage recovery are improved.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a sectional view of the structure of the chemical settling tank of the present invention.

Fig. 3 is a sectional view of the horizontal methanol liquid mixing component of the present invention.

Fig. 4 is a schematic structural diagram of the stirring plate frame of the present invention.

FIG. 5 is a sectional view of the denitrification biological filter tank of the present invention.

Fig. 6 is a sectional view showing the structure of the carbon dioxide absorption tank of the present invention.

Fig. 7 is a sectional view of the structure of the activated carbon purification tank of the present invention.

In the figure: a sewage feeding pipe 1, a water suction pump 2, a sewage feeding valve 3, a reagent precipitation tank 4, a liquid suction pump I5, a horizontal methanol mixed liquid component 6, a methanol feeding pipe 7, a mixed liquid discharge valve 8, a liquid suction pump II 9, a gas blower 10, a denitrification biological filter tank 11, a carbon dioxide absorption tank 12, a nitrogen recovery blower 13, a nitrogen collection pressure tank 14, a liquid suction pump III 15, an activated carbon purification tank 16, a purification water discharge valve 17, a sewage water discharge valve 18, a horizontal methanol mixed liquid rack 19, a precipitate discharge valve 20, a reagent precipitation tank 21, a reagent addition flange pipe 22, a reagent stirring motor 23, a vertical stirring shaft 24, a sewage suction pipe 25, a stirring rod 26, sewage 27, a precipitate discharge pipe 28, a methanol mixed liquid stirring motor 29, a stirring tank 30, a methanol feeding flange pipe 31, a sewage feeding pipe I32, a stirring plate rack 33, a horizontal stirring shaft 34, a mixed liquid discharge pipe 35, a stirring shaft limit mounting seat 36, the device comprises a side plate 37, a stirring main plate 38, a scraper 39, a denitrification biological filter tank body 40, an air inlet explosion pipe 41, a denitrification bacteria filtering biological membrane 42, a carbon dioxide absorption tank body 43, an air inlet collecting pipe 44, a porous exhaust pipe 45, a nitrogen recovery pipe 46, a sodium hydroxide solution 47, an activated carbon purification tank body 48, an inlet pipe 49, a cobblestone layer 50, an activated carbon layer 51, a sandstone layer 52 and an outlet pipe 53.

Detailed Description

The technical solution of the present invention is further specifically described below by way of examples and with reference to the accompanying drawings.

Example (b): as shown in figures 1-7, a sewage enhanced denitrification system comprises a sewage feeding pipe 1, a horizontal methanol mixed liquid assembly 6 and a denitrification biological filter tank 11, wherein the upper end of the horizontal methanol mixed liquid assembly 6 is provided with a methanol feeding pipe 7 connected with the horizontal methanol mixed liquid assembly 6 by a flange bolt, a medicament precipitation tank 4 communicated with the horizontal methanol mixed liquid assembly 6 by a pipeline is arranged between the sewage feeding pipe 1 and the horizontal methanol mixed liquid assembly 6, a liquid pump I5 fixedly connected with the medicament precipitation tank 4 by a flange and communicated with the horizontal methanol mixed liquid assembly 6 by a pipeline is arranged between the medicament precipitation tank 4 and the horizontal methanol mixed liquid assembly 6, a water suction pump 2 connected with the sewage feeding pipe 1 by a flange bolt is arranged between the medicament precipitation tank 4 and the sewage feeding pipe 1, a sewage feeding valve 3 communicated with the medicament precipitation tank 4 by a pipeline is arranged between the water suction pump 2 and the medicament precipitation tank 4, a liquid pump II 9 which is fixedly connected with the denitrification biological filter tank 11 through a flange and is communicated with a horizontal methanol liquid mixing component 6 through a pipeline is arranged between the denitrification biological filter tank 11 and the horizontal methanol liquid mixing component 6, a liquid mixing discharge valve 8 is arranged between the liquid pump II 9 and the lower end of the horizontal methanol liquid mixing component 6, an active carbon purification tank 16 which is communicated with the denitrification biological filter tank 11 through a pipeline is arranged on the side edge of the denitrification biological filter tank 11, a liquid pump III 15 which is fixedly connected with the active carbon purification tank 16 through a flange and is communicated with the denitrification biological filter tank 11 through a pipeline is arranged between the active carbon purification tank 16 and the denitrification biological filter tank 11, and a sewage discharge valve 18 which is communicated with the denitrification biological filter tank 11 through a pipeline is arranged between the liquid pump III 15 and the denitrification biological filter tank 11. The denitrification biological filter tank 11 is provided with a carbon dioxide absorption tank 12 communicated with a phase pipeline of the denitrification biological filter tank 11, the carbon dioxide absorption tank 12 comprises a carbon dioxide absorption tank body 43, a sodium hydroxide solution 47 is arranged in the carbon dioxide absorption tank body 43, an air inlet collecting pipe 44 is arranged between the sodium hydroxide solution 47 and the air blower 10, the lower end of the air inlet collecting pipe 44 is provided with a porous exhaust pipe 45 integrally communicated with the air inlet collecting pipe 44, and a nitrogen recovery pipe 46 communicated with a phase pipeline of the nitrogen recovery blower 13 and sleeved with the carbon dioxide absorption tank body 43 is arranged above the sodium hydroxide solution 47. A nitrogen gas collection pressure tank 14 is arranged on the carbon dioxide absorption tank 12, a nitrogen gas recovery fan 13 is arranged between the nitrogen gas collection pressure tank 14 and the carbon dioxide absorption tank 12, and a gas fan 10 is arranged between the carbon dioxide absorption tank 12 and the denitrification biological filter tank 11.

Horizontal methanol liquid mixing component 6 includes agitator tank 30, be equipped with in the agitator tank 30 and extend agitator tank 30 and with agitator tank 30 looks bearing type sealed horizontal (mixing) shaft 34 that cup joints, be equipped with on the horizontal (mixing) shaft 34 and be the stirring grillage 33 of spiral annular equidistant distribution with horizontal (mixing) shaft 34, stirring grillage 33 is including stirring mainboard 38, stirring mainboard 38 both ends all are equipped with and stir mainboard 38 mutually perpendicular and be the curb plate 37 of integration inlay card, be equipped with between two curb plates 37 and be the perpendicular welded scraper blade 39 of integration with stirring mainboard 38. A methanol mixed liquid mixing motor 29 which is in limited socket joint with the horizontal stirring shaft 34 is arranged at one end of the horizontal stirring shaft 34, a stirring shaft limiting mounting seat 36 which is in limited socket joint with the horizontal stirring shaft 34 is arranged at the other end of the horizontal stirring shaft 34, a methanol feeding flange pipe 31 which is in flange type bolted connection with a liquid drawing pump I5 is arranged at the upper end of the stirring tank 30, a sewage inlet pipe I32 which is communicated with the stirring tank 30 and is in flange type bolted connection with a methanol inlet pipe 7 is arranged at the side edge of the methanol feeding flange pipe 31, a mixed liquid outlet pipe 35 which is in flange type bolted connection with a mixed liquid outlet valve 8 is arranged at the lower end of the stirring tank 30, and a horizontal methanol mixed liquid frame 19 which is in clamping and embedded welding with the stirring tank 30 is arranged.

The reagent sedimentation tank 4 comprises a reagent sedimentation tank body 21, sewage 27 is arranged in the reagent sedimentation tank body 21, a vertical stirring shaft 24 which extends to the upper end of the reagent sedimentation tank body 21 and is in bearing type socket joint with the reagent sedimentation tank body 21 is arranged in the reagent sedimentation tank body 21, a stirring rod 26 which is integrated with the vertical stirring shaft 24 and is distributed at equal intervals is arranged between the vertical stirring shaft 24 and the sewage 27, a reagent stirring motor 23 which is integrated with the vertical stirring shaft 24 and is in flange type bolt connection with the reagent sedimentation tank body 21 is arranged at the upper end of the vertical stirring shaft 24, a dosing flange pipe 22 and a sewage pumping pipe 25 which are communicated with the reagent sedimentation tank body 21 are arranged at the side edge of the reagent stirring motor 23, the sewage pumping pipe 25 extends to the lower part of the sewage 27, a precipitate discharge valve 20 is arranged at the lower part of the reagent sedimentation tank body 21, and a precipitate discharge pipe 28 communicated with the reagent sedimentation tank.

The denitrification biological filter tank 11 comprises a denitrification biological

filter tank body

40, 12 denitrification bacteria filtering biological membranes 42 inserted with the denitrification biological filter tank body 40 in a clamping manner are arranged in the denitrification biological filter tank body 40, and an air inlet explosion pipe 41 extending to the side edge of the denitrification bacteria filtering biological membranes 42 is arranged above the denitrification biological filter tank body 40.

The activated carbon purification tank box 16 comprises an activated carbon purification tank box body 48, an inlet pipe 49 communicated with the liquid pump III 15 is arranged at the upper end of the activated carbon purification tank box body 48, a water outlet pipe 53 communicated with the activated carbon purification tank box body 48 is arranged at the lower part of the activated carbon purification tank box body 48, a purification water outlet valve 17 in sealed flange connection with the water outlet pipe 53 is arranged on the end surface of the water outlet pipe 53, a cobble layer 50 is arranged in the activated carbon purification tank box body 48, a sandstone layer 52 is arranged below the cobble layer 50, and an activated carbon layer 51 is arranged between the sandstone layer 52 and the cobble layer 50.

Carry sewage 27 from sewage inlet pipe 1 to medicament precipitation box 4 in through suction pump 2 and sewage feed valve 3, add dephosphorization agent and polyacrylamide to medicament precipitation box 21 in through adding medicine flange pipe 22, carry out the intensive mixing through the puddler 26 on the medicament agitator motor 23 drive vertical (mixing) shaft 24, improve the speed of dephosphorization and deposit, carry the horizontal methanol mixing liquid subassembly 6 with the middle level clear water sewage in the medicament precipitation box 4 in rethread drawing liquid pump I5 and sewage pumping pipe 25. Methanol is added into the sewage 27 in the stirring tank 30, the stirring plate frame 33 on the horizontal stirring shaft 34 is driven by the methanol mixed liquid stirring motor 29 to fully dissolve the methanol into the sewage 27, the sewage 27 with the methanol enters the denitrification biological filter tank 11 through the liquid drawing pump II 9, and the denitrification bacteria filter biological membrane 42 promotes inorganic nitrogen such as nitrogen trioxide and the like to react with the methanol to generate nitrogen, carbon dioxide and water. The nitrogen and the carbon dioxide generated in the denitrification biological filter tank 11 pass through the carbon dioxide absorption tank 12, the sodium hydroxide solution 47 in the carbon dioxide absorption tank 43 absorbs the carbon dioxide to generate soda and sodium bicarbonate precipitate particles, and finally the nitrogen is recycled through the nitrogen recycling fan 13 and the nitrogen collecting pressure tank 14. The sewage 27 after denitrification treatment finally enters the activated carbon purification tank 16 through the liquid pump III 5, and the water quality is purified by the cobble layer 50, the activated carbon layer 51 and the sandstone layer 52 in the activated carbon purification tank body 48 and is discharged from the purified water outlet valve 17.

In conclusion, the sewage enhanced denitrification system has the advantages of high denitrification efficiency, stable effect and low cost. The reuse rate and the water quality of the sewage recovery are improved.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without deviating from the basic characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

In conclusion, the above description is only the specific embodiment of the present invention, but the structural features of the present invention are not limited thereto, and any person skilled in the art can make changes or modifications within the scope of the present invention.

Claims

1. The utility model provides a sewage intensification denitrogenation system which characterized in that: including sewage inlet pipe (1), horizontal methanol mixed liquid subassembly (6) and denitrification biological filter case (11), horizontal methanol mixed liquid subassembly (6) upper end be equipped with horizontal methanol mixed liquid subassembly (6) looks flange formula bolted connection's methyl alcohol inlet pipe (7), sewage inlet pipe (1) and horizontal methanol mixed liquid subassembly (6) within a definite time be equipped with horizontal methanol mixed liquid subassembly (6) looks pipeline intercommunication's medicament precipitation tank (4), medicament precipitation tank (4) and horizontal methanol mixed liquid subassembly (6) within a definite time be equipped with medicament precipitation tank (4) looks flange joint fixed and with the drawing liquid pump I (5) of horizontal methanol mixed liquid subassembly (6) looks pipeline intercommunication, medicament precipitation tank (4) and sewage inlet pipe (1) within a definite time be equipped with intake pump (2) with sewage (1) looks flange formula bolted connection, intake pump (2) and precipitation tank (4) within a definite time be equipped with the inlet pipe of medicament precipitation tank (4) looks pipeline intercommunication Sewage feed valve (3), denitrification biological filter case (11) mix liquid subassembly (6) with horizontal methyl alcohol within a definite time be equipped with denitrification biological filter case (11) looks flange joint fixed and with liquid pump II (9) of horizontal methyl alcohol mixed liquid subassembly (6) looks pipeline intercommunication, liquid pump II (9) mix liquid bleeder valve (8) with horizontal methyl alcohol between liquid subassembly (6) lower extreme, denitrification biological filter case (11) side be equipped with activated carbon purification tank case (16) of denitrification biological filter case (11) looks pipeline intercommunication, activated carbon purification tank case (16) and denitrification biological filter case (11) within a definite time be equipped with activated carbon purification tank case (16) looks flange joint fixed and with denitrification biological filter case (11) looks pipeline intercommunication liquid pump III (15), liquid pump III (15) and denitrification biological filter case (11) within a definite time be equipped with denitrification biological filter case (11) looks effluent valve (11) looks pipeline intercommunication 18).

2. The enhanced denitrification system for sewage of claim 1, wherein: denitrification biological filter case (11) on be equipped with carbon dioxide absorption case (12) with denitrification biological filter case (11) looks pipeline intercommunication, carbon dioxide absorption case (12) on be equipped with nitrogen gas and collect overhead tank (14), nitrogen gas collect overhead tank (14) and carbon dioxide absorption case (12) between be equipped with nitrogen gas recovery fan (13), carbon dioxide absorption case (12) and denitrification biological filter case (11) between be equipped with gas fan (10).

3. The enhanced denitrification system for sewage of claim 2, wherein: carbon dioxide absorption case (12) include carbon dioxide absorption box (43), carbon dioxide absorption box (43) in be equipped with sodium hydroxide solution (47), sodium hydroxide solution (47) and gas fan (10) within a definite time be equipped with intake air collecting pipe (44), intake air collecting pipe (44) lower extreme be equipped with intake air collecting pipe (44) looks integration intercommunication porous formula blast pipe (45), sodium hydroxide solution (47) top be equipped with nitrogen recovery fan (13) looks pipeline intercommunication and with carbon dioxide absorption box (43) nitrogen gas recovery pipe (46) that cup joints mutually.

4. The enhanced denitrification system for sewage of claim 1, wherein: horizontal methanol mixes liquid subassembly (6) including agitator tank (30), agitator tank (30) in be equipped with and extend agitator tank (30) and with agitator tank (30) the sealed horizontal (mixing) shaft (34) that cup joints of looks bearing type, horizontal (mixing) shaft (34) on be equipped with and be spiral annular equidistant distribution's stirring grillage (33) with horizontal (mixing) shaft (34), horizontal (mixing) shaft (34) one end be equipped with horizontal (mixing) shaft (34) the methanol that cup joints that limits mutually mixes liquid motor (29), horizontal (mixing) shaft (34) other end be equipped with the spacing mount pad of (mixing) shaft (36) that cup joints that limits mutually horizontal (mixing) shaft (34), agitator tank (30) upper end be equipped with draw liquid pump I (5) looks flange formula bolted connection's methyl alcohol feeding flange pipe (31), methyl alcohol feeding flange pipe (31) side be equipped with be linked together with agitator tank (30) and with methyl alcohol feeding pipe (7) looks flange formula bolted connection's sewage inlet pipe (7) looks flange formula I (32), agitator tank (30) lower extreme be equipped with mix liquid bleeder valve (8) looks flange formula bolted connection mix liquid outlet pipe (35), agitator tank (30) lower extreme be equipped with agitator tank (30) looks inlay type welded horizontal methyl alcohol mix liquid frame (19).

5. The enhanced denitrification system for sewage of claim 4, wherein: stirring grillage (33) including stirring mainboard (38), stirring mainboard (38) both ends all be equipped with stirring mainboard (38) mutually perpendicular and be curb plate (37) of integration inlay card, be equipped with between both sides board (37) and be integration vertical welding's scraper blade (39) with stirring mainboard (38).

6. The enhanced denitrification system for sewage of claim 1, wherein: the chemical precipitation box (4) comprises a chemical precipitation box body (21), sewage (27) is arranged in the chemical precipitation box body (21), a vertical stirring shaft (24) which extends to the upper end of the chemical precipitation box body (21) and is in bearing type sleeve joint with the chemical precipitation box body (21) is arranged in the chemical precipitation box body (21), a stirring rod (26) which is in integral spiral equal-interval distribution with the vertical stirring shaft (24) is arranged between the vertical stirring shaft (24) and the sewage (27), a chemical stirring motor (23) which is in integral with the vertical stirring shaft (24) and is in flange type bolt connection with the chemical precipitation box body (21) is arranged at the upper end of the vertical stirring shaft (24), a chemical feeding flange pipe (22) and a sewage pumping pipe (25) which are communicated with the chemical precipitation box body (21) are arranged on the side edge of the chemical stirring motor (23), and the sewage pumping pipe (25) extends to the lower part of the sewage (27), the lower part of the drug precipitation box body (21) is provided with a precipitate discharge valve (20), and a precipitate discharge pipe (28) communicated with the drug precipitation box body (21) is arranged between the precipitate discharge valve (20) and the drug precipitation box body (21).

7. The enhanced denitrification system for sewage of claim 1, wherein: denitrification biological filter case (11) including denitrification biological filter case body (40), denitrification biological filter case body (40) in be equipped with a plurality of with denitrification biological filter case body (40) mutually the embedded denitrification fungus of pegging graft and filter biomembrane (42), denitrification biological filter case body (40) top be equipped with and extend to denitrification fungus and filter air blast pipe (41) of biomembrane (42) side.

8. The enhanced denitrification system for sewage of claim 1, wherein: activated carbon purification pond case (16) include activated carbon purification pond case body (48), activated carbon purification pond case body (48) upper end be equipped with inlet tube (49) that are linked together with drawing liquid pump III (15), activated carbon purification pond case body (48) lower part be equipped with outlet pipe (53) that are linked together with activated carbon purification pond case body (48), outlet pipe (53) terminal surface be equipped with outlet pipe (53) looks sealed flange joint's purification outlet valve (17), activated carbon purification pond case body (48) in be equipped with cobble layer (50), cobble layer (50) below be equipped with gravel layer (52), gravel layer (52) and cobble layer (50) between be equipped with activated carbon layer (51).