CN110668566A - Device and method for realizing sludge reduction and total nitrogen removal by sludge fermentation coupling short-cut denitrification series connection two-stage anaerobic ammonia oxidation - Google Patents
Device and method for realizing sludge reduction and total nitrogen removal by sludge fermentation coupling short-cut denitrification series connection two-stage anaerobic ammonia oxidation Download PDFInfo
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- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
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Abstract
A device and a method for realizing sludge reduction and total nitrogen removal by sludge fermentation coupled with short-cut denitrification and series connection of two-stage anaerobic ammonia oxidation belong to the field of biological treatment of sewage. The device comprises a raw water tank, a sludge storage tank, a nitrifying liquid water tank, a middle water tank, two SBR reactors and a water outlet tank. The excess sludge enters a sludge fermentation coupling short-cut denitrification reactor, and organic matters which are difficult to degrade in the sludge are converted into organic matters which are easy to degrade through fermentation; then, nitrified liquid enters a sludge fermentation coupling short-cut denitrification reactor, and a fermentation product is used as a carbon source for reaction to complete the accumulation of nitrite; and finally, the effluent of the reactor and domestic sewage enter an anaerobic ammonia oxidation biofilm reactor together to realize the removal of total nitrogen. The method connects sludge fermentation coupling short-cut denitrification and anaerobic ammonia oxidation in series, thereby reducing the sludge treatment cost, saving carbon sources, and simultaneously providing more appropriate survival conditions for anaerobic ammonia oxidizing bacteria, thereby realizing sludge reduction and total nitrogen removal.
Description
Technical Field
The invention relates to a device and a method for synchronously realizing sludge reduction and total nitrogen removal by sludge fermentation coupling short-cut denitrification series connection two-stage anaerobic ammonia oxidation, belongs to the technical field of biological sewage treatment, and relates to a test device and a test method for realizing harmless reduction of residual sludge and total nitrogen removal.
Background
With the development of industry and the improvement of living standard of residents, the number of nutrient substances such as nitrogen and phosphorus in the water body is increased, and the problem of eutrophication frequently occurs. The removal of phosphorus in the water body can be removed by various methods such as biological adsorption, chemical sedimentation and the like, and nitrogen elements can only reduce nitrogen oxides in a combined state into nitrogen through nitrogen circulation so as to be discharged from the water body. Therefore, it is important to explore a novel denitrification process.
Among them, the anammox process is favored by most scholars because of its high efficiency, economical efficiency and good energy saving effect. Compared with the traditional nitrification and denitrification, the short-cut nitrification coupled anaerobic ammonia oxidation can save 58.6 percent of aeration and 100 percent of carbon source, and the short-cut nitrification coupled anaerobic ammonia oxidation can save 44.9 percent of aeration and 73 percent of carbon source.
In the engineering, certain obstacles still exist in the realization of anammox, such as difficult enrichment of anammox bacteria, weaker competitiveness of anammox bacteria on nitrite than NOB, large amount of urban sewage treatment water, and the like. Compared with a short-cut nitrification process, the short-cut denitrification process avoids the situation that NOB competes for nitrite, and has the advantages of strong stability and difficult damage. However, the short-range denitrifying bacteria have strong selectivity to carbon sources and are difficult to enrich, and the enriched short-range denitrifying bacteria can utilize easily degradable organic matters and cannot utilize difficultly degradable organic matters. Researches show that the conversion from the organic matters which are difficult to degrade to the organic matters which are easy to degrade can be realized by the hydrolysis acidification technology.
Each municipal sewage treatment plant discharges a large amount of excess sludge every day, which is expensive to dispose of and dispose of, and if not disposed of, it will become another form of pollution. And at present, most of municipal sewage is low in C/N, so that a carbon source needs to be added in the traditional denitrification process, the residual sludge is a complex carbon source, and a hydrolysate of the residual sludge can be used as an organic carbon source to help realize the denitrification process, and the method not only realizes the reduction of the residual sludge, but also saves the carbon source.
The composition of active microorganisms in the excess sludge is different, and certain influence is caused on a reaction system, so that pretreatment can be carried out by a certain technical means, the activity of the excess sludge is reduced, and the influence on short-range denitrification is reduced. The existing sludge pretreatment methods comprise a physical method and a chemical method, wherein the physical method comprises ultrasonic treatment, thermal hydrolysis, mechanical crushing and the like, and the chemical method mainly comprises adding chemicals. Compared with a chemical method, the physical method is simpler, safer and easy to control.
If the technical control is based on the means, the sludge fermentation coupled short-cut denitrification is hopeful to be realized so as to realize the conversion of sludge reduction and the stable accumulation of nitrite.
The yield coefficient of denitrifying bacteria is 0.3g VSS/g NH4 +-N, while the productivity coefficient of the anammox bacteria is only 0.066gVSS/g NH4 +And N, so that the growth rate of the denitrifying bacteria is far higher than that of the anammox bacteria, and simultaneously, both the denitrifying bacteria and the anammox bacteria can utilize nitrite as a substrate to generate nitrogen, so that when enough organic matters and nitrate or nitrite exist in the system, the denitrifying bacteria become dominant bacteria gradually, and the number of the anammox bacteria is reduced gradually. Competition between the two species can be resolved by working separately.
The sludge fermentation coupling short-cut denitrification series anaerobic ammonia oxidation process comprises the following steps: on one hand, sludge fermentation coupling short-cut denitrification can be realized in one SBR reactor, and short-cut denitrification and sludge reduction can be simultaneously completed on the basis of no external carbon source. The sludge fermentation coupling short-cut denitrification process can be realized in the reaction process by adding activated sludge of hydrolytic acidification coupling short-cut denitrification into the SBR reactor. In the sludge fermentation process, easily degradable organic matters are generated to provide a carbon source for short-range denitrification, so that the accumulation of nitrite is realized. Meanwhile, the hydrolysate of the excess sludge is used as an organic carbon source to help realize the denitrification process, and the method not only realizes the reduction of the excess sludge, but also saves the carbon source.
On the other hand, anammox denitrification is achieved in one SBBR reactor. By adding the biofilm filler enriched with the anaerobic ammonia oxidizing bacteria into the SBBR, the attachment growth of the anaerobic ammonia oxidizing bacteria can be realized, and the biomass of the anaerobic ammonia oxidizing bacteria is kept. Nitrite in the discharged water of the SBR reactor and ammonia nitrogen in the domestic sewage are subjected to anaerobic ammonia oxidation reaction, and the residual nitrite can be subjected to denitrification by a small amount of denitrifying bacteria carried by the domestic sewage by utilizing organic matters in the nitrite, so that the total nitrogen can be removed.
The series process is simple in process, has the advantages of anaerobic ammonia oxidation, sludge fermentation, short-range denitrification and the like, and simultaneously realizes sludge reduction and total nitrogen removal.
Disclosure of Invention
The invention aims to solve the technical problem of providing a device and a method for a primary sludge fermentation coupling short-cut denitrification series connection secondary anaerobic ammonia oxidation process, which are used for realizing the reduction of excess sludge and saving carbon sources by providing a carbon source through sludge fermentation and generating and accumulating the accumulation of nitrite nitrogen, and then realizing the removal of total nitrogen through series anaerobic ammonia oxidation.
The purpose of the invention is solved by the following technical scheme: the device and the method for realizing sludge reduction and total nitrogen removal by primary sludge fermentation coupling short-cut denitrification and series connection of secondary anaerobic ammonia oxidation are characterized by comprising a municipal sewage raw water tank (1), a sludge mixed liquid storage tank (2), a nitrification liquid water tank (3), a sludge fermentation coupling short-cut denitrification reactor (4), an intermediate water tank (5), an anaerobic ammonia oxidation biomembrane reactor (6) and an effluent water tank (7).
The sludge mixed liquid storage tank (2) is provided with a stirring device III (2.1); a sludge inlet pump (4.1), a water inlet pump I (4.2), a drainage electric valve I (4.3), a stirring device I (4.4), a DO online detector I (4.5), a first sampling port (4.6) and a second sampling port (4.7) are arranged in the sludge fermentation coupling short-cut denitrification reactor (4); the anaerobic ammonia oxidation biofilm reactor (6) is internally provided with a water inlet pump II (6.1), an intermediate water tank water pump (6.2), an electric drain valve II (6.3), a stirring device II (6.4), a DO online detector II (6.5), a filler and a filler frame (6.6) and a sampling port (6.7); the water outlet tank (7) is provided with an overflow pipe (7.1) and a drain pipe (7.2).
Wherein the sludge mixed liquid storage tank (2) is connected with the sludge fermentation coupling short-cut denitrification reactor (4) through a sludge inlet pump (4.1); the nitrifying liquid water tank (3) is connected with the sludge fermentation coupling short-cut denitrification reactor (4) through a water inlet pump I (4.2); a drainage electric valve I (4.3) of the sludge fermentation coupling short-cut denitrification reactor (4) is connected with an intermediate water tank (5); the intermediate water tank (5) is connected with the anaerobic ammonia oxidation biofilm reactor (6) through an intermediate water tank water pump (6.2); the urban sewage raw water tank (1) is connected with the anaerobic ammonia oxidation biofilm reactor (6) through a water inlet pump II (6.1); an electric drain valve II (6.3) of the anaerobic ammonia oxidation biomembrane reactor (6) is connected with a water outlet tank (7).
The invention also provides a method for coupling the primary sludge fermentation with the short-cut denitrification and the series connection of the two-stage anaerobic ammonia oxidation, which comprises the following specific starting and regulating steps:
1) and (3) starting a system: adding the hydrolysis acidification coupling short-range denitrification sludge into a sludge fermentation coupling short-range denitrification reactor (4) to ensure that the sludge concentration in the reactor after inoculation reaches 2000-6000 mg/L (calculated by the effective volume of the reactor); adding the biofilm filler enriched with the anaerobic ammonia oxidizing bacteria into an anaerobic ammonia oxidizing biofilm reactor (6) to enable the biofilm filler of the anaerobic ammonia oxidizing bacteria to account for 20-80% of the effective volume of the anaerobic ammonia oxidizing biofilm reactor (6).
2) Determining the input amount of the excess sludge, the nitrified liquid, the raw water and the intermediate nitrite solution:
taking the residual sludge to ferment at 30 ℃, and determining the concentration of SCOD (cyclic fatty acid dehydrogenase), wherein when the concentration of SCOD does not increase and the SCOD value does not increase within 20 minutes, the concentration is the maximum potential of sludge fermentation at the concentration.
Determining the input amount of organic matters and nitrate in a sludge fermentation coupling short-cut denitrification reactor (4) according to calculation formulas (1) and (2):
V1+V2＝V·P1(2)
note: wherein SCOD is SCOD concentration under the maximum fermentation potential of the excess sludge;
V1、V2v is the organic matter input, the nitrate solution input and the effective volume of the reactor respectively
NO3 -Is the influent nitrate concentration;
C/N is a set value and is selected within the range of 3: 1-6: 1;
P160 percent is taken as a set value for the drainage ratio.
Determining the water inflow of raw water and an intermediate water tank in an anaerobic ammonia oxidation biofilm reactor (6) according to calculation formulas (3) and (4):
V3+V4＝V·P2(4)
note: in the formula NO2 -As NO in the intermediate water tank2 -Concentration, NH4 +-For raw water NH4 +Concentration;
V3、V4and V are respectively NO2 -Solution feed, NH4 +The solution input and the effective volume of the reactor;
P2the set value is 50% for the drainage ratio;
NO2 -/NH4 +the value is selected within the range of 1.4: 1-2: 1 for setting the ratio.
3) The runtime adjustment operation is as follows:
adding the excess sludge into a sludge mixed liquid storage tank (1), starting a stirrer (1.1) before the beginning of each period to uniformly mix the excess sludge, then starting a sludge inlet pump (4.1), and adding the excess sludge into the sludge mixed liquid storage tank at the beginning of each periodV1Pumping the residual sludge mixed liquor with the volume into a sludge fermentation coupling short-cut denitrification reactor (4) for sludge fermentation;
when the sludge fermentation coupling short-cut denitrification reactor (4) operates, anaerobic stirring is firstly carried out for 200-800 min in each period, and the anaerobic stirring is finished when the SCOD value reaches more than 95% of the maximum fermentation potential; then starting a water inlet pump I (4.2) to nitrify V in the liquid water tank (3)2Pumping the nitrified liquid into a sludge fermentation coupling short-cut denitrification reactor (4) in volume, so that the concentration of nitrate nitrogen in the sludge fermentation coupling short-cut denitrification reactor (4) is set concentration, and the set concentration meets the condition that C/N is 3: 1-6: 1; stirring under oxygen-poor condition until the conversion rate of nitrite is more than 80% or the concentration of nitrate and nitrogen is less than 3mg/L, stopping stirring, beginning precipitation and water drainage for 10 min, and entering the next period after idling.
After the sludge fermentation coupling short-cut denitrification reactor (4) finishes draining, starting an intermediate water tank water pump (6.2) to enable an intermediate water tank V3Pumping the volume of nitrified liquid into an anaerobic ammonia oxidation biofilm reactor (6), and simultaneously starting a water pump II (6.1) to pump V4Pumping the raw water of the urban sewage into an anaerobic ammonia oxidation biofilm reactor (6) in volume to enable the ratio of nitrite to ammonia nitrogen to meet a set value, wherein the set value is arbitrarily selected within the range of 1.4: 1-2: 1; stirring under oxygen deficiency till the total inorganic nitrogen concentration is lower than 5mg/L, stopping stirring, precipitating, draining for 10 min, and entering the next period after idling.
The device and the method for realizing sludge reduction and total nitrogen removal by sludge fermentation coupled with shortcut denitrification and series connection of two-stage anaerobic ammonia oxidation have the following advantages:
1) by adopting the sludge fermentation technology, the reduction of the residual activated sludge is realized, the residual sludge is recycled, the addition of an external carbon source is reduced, and the sludge treatment cost is saved.
2) The accumulation of stable nitrite is realized through condition control, a substrate source can be provided for a secondary anaerobic ammonia oxidation process, and a good reference thought is provided for the realization of a short-cut denitrification process and process control.
3) Sludge fermentation coupling short-cut denitrification is realized in the same reactor, the excess sludge is easily degraded and is converted into easily degradable organic matters, an easily degradable carbon source is provided for short-cut denitrifying bacteria, the accumulation of nitrite in the short-cut denitrification is realized under the condition without an external carbon source, and the energy is saved.
4) The process device is a two-stage series device, the first-stage reactor performs sludge fermentation and short-range denitrification, and the second-stage reactor performs anaerobic ammonia oxidation, so that the condition that denitrifying bacteria and anaerobic ammonia oxidation bacteria compete for substrates is avoided, high-quality reaction conditions can be provided for the anaerobic ammonia oxidation bacteria, and the anaerobic ammonia oxidation reaction is facilitated.
Drawings
FIG. 1 is a schematic structural diagram of a device for realizing sludge reduction and total nitrogen removal by sludge fermentation coupled with short-cut denitrification and series connection of two-stage anaerobic ammonia oxidation.
In the figure, 1 is a raw water tank of municipal sewage, 2 is a sludge mixed liquid storage tank, 3 is a nitrifying liquid water tank, 4 is a sludge fermentation coupling short-cut denitrification reactor, 5 is an intermediate water tank, 6 is an anaerobic ammonia oxidation biofilm reactor, and 7 is an effluent water tank; 2.1 is a stirring device III; 4.1 is a mud inlet pump, 4.2 is a water inlet pump I, 4.3 is a water drainage electric valve I, 4.4 is a stirring device I, 4.5 is a DO online detector I, 4.6 is a first sampling port, and 4.7 is a second sampling port; 6.1 is a water inlet pump II, 6.2 is an intermediate water tank water pump, 6.3 is an electric drain valve II, 6.4 is a stirring device II, 6.5 is a DO online detector II, 6.6 is a filler and a filler frame, and 6.7 is a sampling port; 7.1 is an overflow pipe of the water outlet tank, and 7.2 is a water outlet tank drain pipe.
Detailed Description
The invention is further described with reference to the following figures and examples: as shown in fig. 1, the device and the method for realizing conversion of granular refractory organic matters and accumulation of nitrite by single sludge fermentation coupled short-cut denitrification are characterized by comprising a municipal sewage raw water tank (1), a sludge mixed liquid storage tank (2), a nitrifying liquid water tank (3), a sludge fermentation coupled short-cut denitrification reactor (4), an intermediate water tank (5), an anaerobic ammonia oxidation biofilm reactor (6) and an effluent water tank (7).
The sludge mixed liquid storage tank (2) is provided with a stirring device III (2.1); a sludge inlet pump (4.1), a water inlet pump I (4.2), a drainage electric valve I (4.3), a stirring device I (4.4), a DO online detector I (4.5), a first sampling port (4.6) and a second sampling port (4.7) are arranged in the sludge fermentation coupling short-cut denitrification reactor (4); the anaerobic ammonia oxidation biofilm reactor (6) is internally provided with a water inlet pump II (6.1), an intermediate water tank water pump (6.2), an electric drain valve II (6.3), a stirring device II (6.4), a DO online detector II (6.5), a filler and a filler frame (6.6) and a sampling port (6.7); the water outlet tank (7) is provided with an overflow pipe (7.1) and a drain pipe (7.2).
Wherein the sludge mixed liquid storage tank (2) is connected with the sludge fermentation coupling short-cut denitrification reactor (4) through a sludge inlet pump (4.1); the nitrifying liquid water tank (3) is connected with the sludge fermentation coupling short-cut denitrification reactor (4) through a water inlet pump I (4.2); a drainage electric valve I (4.3) of the sludge fermentation coupling short-cut denitrification reactor (4) is connected with an intermediate water tank (5); the intermediate water tank (5) is connected with the anaerobic ammonia oxidation biofilm reactor (6) through an intermediate water tank water pump (6.2); the urban sewage raw water tank (1) is connected with the anaerobic ammonia oxidation biofilm reactor (6) through a water inlet pump II (6.1); an electric drain valve II (6.3) of the anaerobic ammonia oxidation biomembrane reactor (6) is connected with a water outlet tank (7).
In the test process, the specific experimental water is domestic sewage from family areas of Beijing university of industry, and the specific water quality is as follows: COD concentration is 178-298 mg/L, NH4 +The concentration of-N is 45-71 mg/L, NO2 -N concentration < 1mg/L, NO3 --N concentration 0.1-1.4 mg/L, PO4 3-The concentration of-P is 4.3-7.6 mg/L, and the pH value is 7.3-7.6. Sludge fermentation the excess sludge is taken from pilot plant secondary sedimentation tank sludge of Beijing university of industry, is inactivated by a physical method and then is added into a sludge storage tank (1). The nitrifying liquid is the effluent of a laboratory nitration reactor or nitrate wastewater, and NO is uniformly mixed3 -The concentration of-N is 10-50 mg/L. The test system is shown in figure 1, the reactor is made of organic glass, and the effective volumes of the sludge fermentation coupling short-cut denitrification reactor (4) and the anaerobic ammonia oxidation biofilm reactor (6) are both 10L.
The specific operation is as follows:
1) and (3) starting a system: adding the hydrolysis acidification coupling short-range denitrification sludge into a sludge fermentation coupling short-range denitrification reactor (4) to ensure that the sludge concentration in the reactor after inoculation reaches 2000-6000 mg/L (calculated by the effective volume of the reactor); adding the biofilm filler enriched with the anaerobic ammonia oxidizing bacteria into an anaerobic ammonia oxidizing biofilm reactor (6) to enable the biofilm filler of the anaerobic ammonia oxidizing bacteria to account for 20-80% of the effective volume of the anaerobic ammonia oxidizing biofilm reactor (6).
2) Determining the input amount of the excess sludge, the nitrified liquid, the raw water and the intermediate nitrite solution:
taking the residual sludge to ferment at 30 ℃, and determining the concentration of SCOD (cyclic fatty acid dehydrogenase), wherein when the concentration of SCOD does not increase and the SCOD value does not increase within 20 minutes, the concentration is the maximum potential of sludge fermentation at the concentration.
Determining the input amount of organic matters and nitrate in a sludge fermentation coupling short-cut denitrification reactor (4) according to calculation formulas (1) and (2):
V1+V2＝V·P1(2)
note: wherein SCOD is SCOD concentration under the maximum fermentation potential of the excess sludge;
V1、V2v is the organic matter input, the nitrate solution input and the effective volume of the reactor respectively
NO3 -Is the influent nitrate concentration;
C/N is a set value and is selected within the range of 3: 1-6: 1;
P160 percent is taken as a set value for the drainage ratio.
Determining the water inflow of raw water and an intermediate water tank in an anaerobic ammonia oxidation biofilm reactor (6) according to calculation formulas (3) and (4):
V3+V4＝V·P2(4)
note: in the formula NO2 -As NO in the intermediate water tank2 -Concentration, NH4 +-For raw water NH4 +Concentration;
V3、V4and V are respectively NO2 -Solution feed, NH4 +The solution input and the effective volume of the reactor;
P2the set value is 50% for the drainage ratio;
NO2 -/NH4 +the value is selected within the range of 1.4: 1-2: 1 for setting the ratio.
3) The runtime adjustment operation is as follows:
adding the excess sludge into a sludge mixed liquid storage tank (1), starting a stirrer (1.1) before the beginning of each period to uniformly mix the excess sludge, then starting a sludge inlet pump (4.1), and adding V at the beginning of each period1Pumping the residual sludge mixed liquor with the volume into a sludge fermentation coupling short-cut denitrification reactor (4) for sludge fermentation;
when the sludge fermentation coupling short-cut denitrification reactor (4) operates, anaerobic stirring is firstly carried out for 200-800 min in each period, and the anaerobic stirring is finished when the SCOD value reaches more than 95% of the maximum fermentation potential; then starting a water inlet pump I (4.2) to nitrify V in the liquid water tank (3)2Pumping the nitrified liquid into a sludge fermentation coupling short-cut denitrification reactor (4) in volume, so that the concentration of nitrate nitrogen in the sludge fermentation coupling short-cut denitrification reactor (4) is set concentration, and the set concentration meets the condition that C/N is 3: 1-6: 1; stirring under oxygen-poor condition until the conversion rate of nitrite is more than 80% or the concentration of nitrate and nitrogen is less than 3mg/L, stopping stirring, beginning precipitation and water drainage for 10 min, and entering the next period after idling.
After the sludge fermentation coupling short-cut denitrification reactor (4) finishes draining, starting an intermediate water tank water pump (6.2) to enable an intermediate water tank V3Pumping the volume of nitrified liquid into an anaerobic ammonia oxidation biofilm reactor (6), and simultaneously starting a water pump II (6.1) to pump V4The raw water of the urban sewage with the volume is pumped into an anaerobic ammonia oxidation biomembrane reactor (6) to ensure that the ratio of nitrite to ammonia nitrogen meets the set requirementSetting the value, wherein the set value is arbitrarily selected within the range of 1.4: 1-2: 1; stirring under oxygen deficiency till the total inorganic nitrogen concentration is lower than 5mg/L, stopping stirring, precipitating, draining for 10 min, and entering the next period after idling.
Experimental results show that the pretreated excess sludge can be converted into easily degradable organic matters in the sludge fermentation stage and used as a carbon source for short-range denitrification, and the sludge reduction effect can reach 50% -70%; the accumulation of nitrite can be realized in the denitrification stage, the accumulation rate reaches 60-80%, and the concentration of nitrate nitrogen in the effluent water can be ignored; in the anaerobic ammonia oxidation stage, the anaerobic ammonia oxidation bacteria can completely convert ammonia nitrogen into nitrogen, the residual nitrite can be reduced into nitrogen by denitrifying bacteria by utilizing organic matters in the domestic sewage, and the total nitrogen of effluent is less than 5 mg/L.
Claims (2)
1. The device for realizing sludge reduction and total nitrogen removal by sludge fermentation coupling shortcut denitrification series connection with two-stage anaerobic ammonia oxidation is characterized by comprising a municipal sewage raw water tank (1), a sludge mixed liquid storage tank (2), a nitrification liquid water tank (3), a sludge fermentation coupling shortcut denitrification reactor (4), an intermediate water tank (5), an anaerobic ammonia oxidation biomembrane reactor (6) and an effluent water tank (7);
the sludge mixed liquid storage tank (2) is provided with a stirring device III (2.1); a sludge inlet pump (4.1), a water inlet pump I (4.2), a drainage electric valve I (4.3), a stirring device I (4.4), a DO online detector I (4.5), a first sampling port (4.6) and a second sampling port (4.7) are arranged in the sludge fermentation coupling short-cut denitrification reactor (4); the anaerobic ammonia oxidation biofilm reactor (6) is internally provided with a water inlet pump II (6.1), an intermediate water tank water pump (6.2), an electric drain valve II (6.3), a stirring device II (6.4), a DO online detector II (6.5), a filler and a filler frame (6.6) and a sampling port (6.7); the water outlet tank (7) is provided with an overflow pipe (7.1) and a drain pipe (7.2);
wherein the sludge mixed liquid storage tank (2) is connected with the sludge fermentation coupling short-cut denitrification reactor (4) through a sludge inlet pump (4.1); the nitrifying liquid water tank (3) is connected with the sludge fermentation coupling short-cut denitrification reactor (4) through a water inlet pump I (4.2); a drainage electric valve I (4.3) of the sludge fermentation coupling short-cut denitrification reactor (4) is connected with an intermediate water tank (5); the intermediate water tank (5) is connected with the anaerobic ammonia oxidation biofilm reactor (6) through an intermediate water tank water pump (6.2); the urban sewage raw water tank (1) is connected with the anaerobic ammonia oxidation biofilm reactor (6) through a water inlet pump II (6.1); an electric drain valve II (6.3) of the anaerobic ammonia oxidation biomembrane reactor (6) is connected with a water outlet tank (7).
2. The method for realizing sludge reduction and total nitrogen removal by using the device as claimed in claim 1, which is characterized by comprising the following steps:
1) and (3) starting a system: adding the hydrolysis acidification coupling short-range denitrification sludge into a sludge fermentation coupling short-range denitrification reactor (4) to enable the sludge concentration in the reactor after inoculation to reach 2000-6000 mg/L; adding the biofilm filler enriched with the anaerobic ammonia oxidizing bacteria into an anaerobic ammonia oxidizing biofilm reactor (6) to enable the biofilm filler of the anaerobic ammonia oxidizing bacteria to account for 20-80% of the effective volume of the anaerobic ammonia oxidizing biofilm reactor (6);
2) determining the input amount of the excess sludge, the nitrified liquid, the raw water and the intermediate nitrite solution:
taking the residual sludge to ferment at 30 ℃, and determining the concentration of SCOD (cyclic fatty acid dehydrogenase), wherein when the concentration of SCOD does not increase and the SCOD value does not increase any more within 20 minutes, the concentration is the maximum potential of sludge fermentation at the concentration;
determining the input amount of organic matters and nitrate in a sludge fermentation coupling short-cut denitrification reactor (4) according to calculation formulas (1) and (2):
V1+V2＝V·P1(2)
note: wherein SCOD is SCOD concentration under the maximum fermentation potential of the excess sludge;
V1、V2v is the organic matter input, the nitrate solution input and the effective volume of the reactor respectively
NO3 -Is the influent nitrate concentration;
C/N is a set value and is selected within the range of 3: 1-6: 1;
P1taking 60% as a drainage ratio and setting a value;
determining the water inflow of raw water and an intermediate water tank in an anaerobic ammonia oxidation biofilm reactor (6) according to calculation formulas (3) and (4):
V3+V4＝V·P2(4)
note: in the formula NO2 -As NO in the intermediate water tank2 -Concentration, NH4 +-For raw water NH4 +Concentration;
V3、V4and V are respectively NO2 -Solution feed, NH4 +The solution input and the effective volume of the reactor;
P2the set value is 50% for the drainage ratio;
NO2 -/NH4 +in order to set the ratio, the value is selected within the range of 1.4: 1-2: 1;
3) the runtime adjustment operation is as follows:
adding the excess sludge into a sludge mixed liquid storage tank (1), starting a stirrer (1.1) before the beginning of each period to uniformly mix the excess sludge, then starting a sludge inlet pump (4.1), and adding V at the beginning of each period1Pumping the residual sludge mixed liquor with the volume into a sludge fermentation coupling short-cut denitrification reactor (4) for sludge fermentation;
when the sludge fermentation coupling short-cut denitrification reactor (4) operates, anaerobic stirring is firstly carried out for 200-800 min in each period, and the anaerobic stirring is finished when the SCOD value reaches more than 95% of the maximum fermentation potential; then starting a water inlet pump I (4.2) to nitrify V in the liquid water tank (3)2Pumping the nitrified liquid into a sludge fermentation coupling short-cut denitrification reactor (4) in volume, so that the concentration of nitrate nitrogen in the sludge fermentation coupling short-cut denitrification reactor (4) is set concentration, and the set concentration meets the condition that C/N is 3: 1-6: 1; stirring under oxygen deficiency until the conversion rate of nitrite reaches more than 80% or nitreThe nitrogen concentration is less than 3mg/L, then stirring is stopped, precipitation and drainage are started for 10 minutes, and the next period is carried out after the solution is idle;
after the sludge fermentation coupling short-cut denitrification reactor (4) finishes draining, starting an intermediate water tank water pump (6.2) to enable an intermediate water tank V3Pumping the volume of nitrified liquid into an anaerobic ammonia oxidation biofilm reactor (6), and simultaneously starting a water pump II (6.1) to pump V4Pumping the raw water of the urban sewage into an anaerobic ammonia oxidation biofilm reactor (6) in volume to enable the ratio of nitrite to ammonia nitrogen to meet a set value, wherein the set value is arbitrarily selected within the range of 1.4: 1-2: 1; stirring under oxygen deficiency till the total inorganic nitrogen concentration is lower than 5mg/L, stopping stirring, precipitating, draining for 10 min, and entering the next period after idling.
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