CN112479362A - Device and method for treating municipal sewage by combining sludge fermentation with short-cut denitrification anaerobic ammonia oxidation - Google Patents
Device and method for treating municipal sewage by combining sludge fermentation with short-cut denitrification anaerobic ammonia oxidation Download PDFInfo
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Abstract
The invention belongs to the technical field of biological sewage treatment, and relates to a device and a method for treating urban sewage by combining sludge fermentation with short-range denitrification anaerobic ammonia oxidation, wherein the urban sewage enters an integrated short-range denitrification anaerobic ammonia oxidation reactor from an urban sewage raw water tank through a third water inlet pump; in an integrated short-cut denitrification anaerobic ammonium oxidation reactor, reducing nitric acid nitrogen of municipal sewage into nitrite nitrogen by using a carbon source in sludge fermentation liquor; the nitrite nitrogen of the reduction product and the ammonia nitrogen in the inlet water are taken as substrates to carry out autotrophic denitrification so as to achieve the aim of deep denitrification; after the operation of the integrated short-cut denitrification anaerobic ammonia oxidation reactor is finished, precipitating and draining water, and enabling effluent to enter an effluent water tank through an electric drain valve; under the condition of not adding an organic carbon source, the method can quickly realize the deep denitrification and sludge reduction of the municipal sewage, has low operating cost and low sludge yield, is easy to operate and control, and provides theoretical basis and technical support for the municipal sewage treatment plant to treat the municipal sewage and the excess sludge.
Description
The technical field is as follows:
the invention belongs to the technical field of biological sewage treatment, and relates to a device and a method for treating urban sewage by combining sludge fermentation with short-cut denitrification and anaerobic ammonia oxidation, which are used for realizing deep denitrification and sludge reduction of the urban sewage.
Background art:
with the gradual increase of the sewage discharge standard, the upgrading and the reconstruction of the urban sewage treatment plant are imperative, wherein the bottleneck lies in improving the total nitrogen removal effect. In order to protect the environment, domestic sewage plants gradually start to be upgraded and reformed so as to ensure that the effluent quality standard reaches the first class A standard of pollutant discharge Standard of municipal Sewage treatment plant (GB 18918-2002). The removal of total nitrogen is particularly important in the upgrading and reconstruction of sewage plants, and the difficulty and the investment ratio are the greatest. 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. 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 excess sludge is used as a by-product of sewage treatment of the municipal sewage treatment plant, has complex components, contains harmful substances such as heavy metals, germs and the like, also contains a large amount of organic substances, nitrogen, phosphorus, potassium and other nutrient elements required by plants, and if no treatment is carried out, not only resource waste is caused, but also the environment is polluted. A large amount of excess sludge is discharged every day by a municipal sewage treatment plant, the treatment and disposal cost is high, meanwhile, if the treatment is improper, the treatment can cause pollution in another form, and the current municipal sewage is mostly low in C/N, so that a carbon source needs to be added in the traditional denitrification process, the excess sludge is a carbon source in a complex form, a hydrolysate of the excess 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 excess sludge, but also saves the carbon source.
The combined process of the short-cut denitrification and the anaerobic ammonia oxidation has great research potential in the aspect of deep nitrogen removal of sewage. In the traditional denitrification process, denitrifying bacteria reduce nitric acid nitrogen into nitrogen by using organic matters as electron donors, and the theoretical value of COD (chemical oxygen demand) required to be consumed when 1g of nitric acid nitrogen is reduced into nitrogen is 2.85 g. The combined technology of short-cut denitrification and anaerobic ammonia oxidation is an autotrophic biological denitrification process that firstly heterotrophic denitrifying bacteria are utilized to reduce nitric acid nitrogen into nitrite nitrogen, and then anaerobic ammonia oxidizing bacteria are utilized to oxidize ammonia nitrogen into nitrogen by taking nitrite nitrogen as an electron acceptor. Therefore, a novel municipal sewage treatment device and a novel municipal sewage treatment method are sought to be designed to realize deep denitrification and sludge reduction.
The invention content is as follows:
the invention aims to overcome the defects in the prior art, and designs and provides a device and a method for treating urban sewage by combining sludge fermentation with short-cut denitrification and anaerobic ammonia oxidation, which combine key technologies such as acclimation of excess sludge of a sewage treatment plant, short-cut denitrification and anaerobic ammonia oxidation combined process and the like to realize deep denitrification and sludge reduction of the urban sewage.
In order to achieve the purpose, the main structure of the device for treating the municipal sewage by combining sludge fermentation with short-cut denitrification anaerobic ammonia oxidation comprises a residual sludge fermentation tank, a fermentation liquor water tank, a municipal sewage raw water tank, an integrated short-cut denitrification anaerobic ammonia oxidation reactor, a return water tank and an effluent water tank; wherein the excess sludge fermentation tank is connected with a fermentation liquor water tank through a first water inlet pump; the fermentation liquid water tank is connected with the integrated short-cut denitrification anaerobic ammonia oxidation reactor through a second water inlet pump; the urban sewage raw water tank is connected with the integrated short-cut denitrification anaerobic ammonia oxidation reactor through a third water inlet pump; the integrated short-cut denitrification anaerobic ammonia oxidation reactor is connected with a reflux water tank through a drainage pump; the return water produced by the return water tank is connected with the integrated short-cut denitrification anaerobic ammonia oxidation reactor through a fourth water inlet pump; gas generated by reaction in the integrated short-cut denitrification anaerobic ammonia oxidation reactor is connected with the integrated short-cut denitrification anaerobic ammonia oxidation reactor through an air pump; the integrated short-cut denitrification anaerobic ammonia oxidation reactor is connected with a water outlet tank through an electric drain valve; the sludge inlet pump is arranged in the excess sludge fermentation tank, the stirring device is positioned on one side of the sludge inlet pump and is arranged in the excess sludge fermentation tank, and the right side in the excess sludge fermentation tank is provided with a first sampling port; an electric drain valve is arranged at the top end of the right side of the integrated short-cut denitrification anaerobic ammonia oxidation reactor, a drain pump is arranged below the electric drain valve, the bottom of the integrated short-cut denitrification anaerobic ammonia oxidation reactor is connected with an air pump, and a second sampling port, a third sampling port, a fourth sampling port and a fifth sampling port are sequentially arranged in the middle section of the right side of the integrated short-cut denitrification anaerobic ammonia oxidation reactor from top to bottom; the upper end of the right side of the water outlet tank is connected with an overflow pipe, and the lower end of the water outlet tank is connected with a drain pipe.
The treatment process of the municipal sewage in the device comprises the following steps: the urban sewage enters the integrated short-range denitrification anaerobic ammonia oxidation reactor from the urban sewage raw water tank through a third water inlet pump; in an integrated short-cut denitrification anaerobic ammonium oxidation reactor, reducing nitric acid nitrogen of municipal sewage into nitrite nitrogen by using a carbon source in sludge fermentation liquor; the nitrite nitrogen of the reduction product and the ammonia nitrogen in the inlet water are taken as substrates to carry out autotrophic denitrification so as to achieve the aim of deep denitrification; and after the operation of the integrated short-cut denitrification anaerobic ammonia oxidation reactor is finished, precipitating and draining water, and enabling the discharged water to enter a water outlet tank through an electric drain valve.
The invention adopts the sludge fermentation combined short-cut denitrification anaerobic ammonia oxidation treatment municipal sewage device to carry out municipal sewage treatment, which comprises the following specific steps:
1) starting the device:
adding the excess sludge of the sewage treatment plant into an excess sludge fermentation tank, so that the sludge concentration in the inoculated sludge fermentation tank reaches 2000-6000 mg/L; adding the biofilm filler enriched with the anaerobic ammonium oxidation bacteria into the integrated short-cut denitrification anaerobic ammonium oxidation reactor, so that the biofilm filler of the anaerobic ammonium oxidation bacteria accounts for 20-80% of the effective volume of the integrated short-cut denitrification anaerobic ammonium oxidation reactor;
determining the input amount of excess sludge, sludge fermentation liquor, municipal sewage and intermediate nitrite solution:
taking the residual sludge to ferment at 30 ℃, and determining the concentration of SCOD (soluble COD), 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 the integrated short-cut denitrification anaerobic ammonia oxidation reactor according to the calculation formulas (1) and (2):
V2+V3＝V·P1 (2)
wherein SCOD is SCOD concentration under the maximum fermentation potential of the excess sludge; v2、V3V is the sludge fermentation liquor, the raw water inflow of urban sewage and the effective volume of the reactor respectively; NO3 -The nitrate concentration of the municipal sewage; the value of C/N is 3: 1-6: 1; p1Taking 60% as the drainage ratio;
determining the water inflow of the raw water and the return water tank according to the calculation formulas (3) and (4):
V4+V5＝V·P2 (4)
in the formula NO2 -For NO in the feed water to the return water tank2 -Concentration, NH4 +For raw water NH4 +Concentration; v4、V5And V are respectively NO2 -Solution feed, NH4 +The solution input and the effective volume of the reactor; p2The value is 50% for the drainage ratio; NO2 -/NH4 +The value is arbitrarily selected within the range of 1.4: 1-2: 1;
2) the runtime adjustment operation is as follows:
adding municipal sewage into a municipal sewage raw water tank, adding excess sludge into an excess sludge fermentation tank, starting a sludge feeding pump, pumping the excess sludge into the excess sludge fermentation tank at the beginning of each period, starting a stirring device to uniformly mix the excess sludge, performing sludge alkaline anaerobic fermentation, and feeding sludge fermentation liquor into a fermentation liquor water tank through a first water feeding pump;
when the integrated short-cut denitrification anaerobic ammonia oxidation reactor operates, firstly carrying out anaerobic stirring for 200-800 min in each period of the residual sludge fermentation tank, and finishing the anaerobic stirring when the SCOD value reaches more than 95% of the maximum fermentation potential; then starting a first water inlet pump to pump the sludge fermentation liquor into the fermentation liquor water tank; starting a second water inlet pump to pump the sludge fermentation liquor into the integrated short-cut denitrification anaerobic ammonia oxidation reactor; starting a third water inlet pump to pump the urban sewage raw water in the urban sewage raw water tank into the integrated short-cut denitrification anaerobic ammonia oxidation reactor, so that the concentration of the nitric acid nitrogen in the integrated short-cut denitrification anaerobic ammonia oxidation reactor meets the requirement that the concentration ratio of the total content of carbon to the total content of nitrogen is within the range of 3: 1-6: 1; stirring under oxygen deficiency until the conversion rate of nitrite reaches more than 80% or the concentration of nitrate and nitrogen is less than 3 mg/L; the ratio of nitrite nitrogen to ammonia nitrogen is within the range of 1.4: 1-2: 1, stirring in an anoxic condition until the total inorganic nitrogen concentration is lower than 5mg/L, stopping stirring, beginning precipitation and drainage for 10-15 minutes, standing for 10-15 minutes, and entering the next reaction period;
when the integrated short-cut denitrification anaerobic ammonia oxidation reactor runs, sludge needs to be discharged, so that the concentration of suspended activated sludge in the integrated short-cut denitrification anaerobic ammonia oxidation reactor is maintained within the range of 1500-2500 mg/L.
Compared with the prior art, the method has the advantages that the excess sludge enters an excess sludge fermentation tank, organic matters which are difficult to biodegrade in the sludge are converted into organic matters which are easy to biodegrade through alkaline anaerobic fermentation, then the sludge fermentation liquor enters a fermentation liquor water tank, and the fermentation liquor is used as a supplementary carbon source to realize the conversion to nitrite; the sludge fermentation liquor and the municipal sewage enter the integrated short-cut denitrification anaerobic ammonia oxidation reactor together to remove the total nitrogen, and the integrated short-cut denitrification anaerobic ammonia oxidation reactor has the following advantages: the method is a combined system which organically combines the key technologies of the alkaline anaerobic fermentation of the excess sludge, the short-range denitrification anaerobic ammonia oxidation combined process and the like, reasonably optimizes the adding mode of the fermentation liquor and the process operation parameters, utilizes the organic internal carbon source in the excess sludge to the maximum extent and realizes low energy consumption and deep denitrification; and residual sludge fermentation liquor is used as a supplementary carbon source to provide a substrate for the anaerobic ammonium oxidation reaction by short-range denitrification, and the depth of sewage can be realized without adding an organic carbon source additionallyDenitrification; compared with the traditional mode, the operation cost is reduced; thirdly, the urban sewage is upgraded and reformed at present and is applied more A2The O + denitrification filter tank process needs to add a large amount of carbon source and A2The nitrification rate of the O aerobic zone is reduced along with the reduction of the water temperature in winter, so that the ammonia nitrogen in the effluent exceeds the standard and A2The aerobic nitrification aeration of the O biochemical tank has high energy consumption and the like, the contribution of anaerobic ammonia oxidation in the integrated short-cut denitrification anaerobic ammonia oxidation reactor to the removal of system nitrogen can reach 90 percent, the key for maintaining the main denitrification way of anaerobic ammonia oxidation of the reactor is the nitrogen removal of a single-stage reactor, and the diluted urban sewage contains low-concentration carbon, thereby avoiding the adverse effect of organic matters on autotrophic bacteria and being capable of showing excellent denitrification performance by directly applying the urban sewage treatment; the process has the advantages of simple structure, low operating cost, low sludge yield and easy operation regulation and control by adding the sludge fermentation liquor as a supplementary carbon source and optimizing the operation parameters such as water inflow distribution, water discharge ratio, water inflow mode and the like under the condition of not adding an organic carbon source, is an efficient and low-energy-consumption sludge fermentation liquor as a supplementary carbon source sewage deep denitrification process, has practical application value, and provides theoretical basis and technical support for treating urban sewage and residual sludge by an urban sewage treatment plant.
Description of the drawings:
FIG. 1 is a schematic structural diagram of a main body of a device for treating municipal sewage by combining sludge fermentation with short-cut denitrification and anaerobic ammonia oxidation, wherein 1 is an excess sludge fermentation tank; 2 is a fermentation liquor water tank; 3 is a city sewage raw water tank; 4, an integrated short-cut denitrification anaerobic ammonia oxidation reactor; 5 is a return water tank; 6 is a water outlet tank; 1.1 is a mud pump; 1.2 is a stirring device; 1.3 is a first sampling port; 2.1 is a first water inlet pump; 2.2 is a second water inlet pump and 3.1 is a third water inlet pump; 4.1 is a drainage pump; 4.2 is an air pump; 4.3 is an electric drain valve; 4.4 is a second sampling port; 4.5 is a third sampling port; 4.6 is a fourth sampling port; 4.7 is a fifth sampling port; 5.1 is a fourth water inlet pump; 6.1 is an overflow pipe; 6.2 is a drain pipe.
The specific implementation mode is as follows:
the invention is further described below with reference to the accompanying drawings and examples.
Example (b):
the structure of the device for treating municipal sewage by combining sludge fermentation with short-cut denitrification anaerobic ammonia oxidation is shown in fig. 1, and the device comprises a residual sludge fermentation tank 1, a fermentation liquor water tank 2, a municipal sewage raw water tank 3, an integrated short-cut denitrification anaerobic ammonia oxidation reactor 4, a return water tank 5 and an effluent water tank 6; wherein the excess sludge fermentation tank 1 is connected with a fermentation liquor water tank 2 through a first water inlet pump 2.1; the fermentation liquid water tank 2 is connected with the integrated short-cut denitrification anaerobic ammonia oxidation reactor 4 through a second water inlet pump 2.2; the urban sewage raw water tank 3 is connected with the integrated short-cut denitrification anaerobic ammonia oxidation reactor 4 through a third water inlet pump 3.1; the integrated short-cut denitrification anaerobic ammonia oxidation reactor 4 is connected with a return water tank 5 through a drainage pump 4.1; the return water produced by the return water tank 5 is connected with the integrated short-cut denitrification anaerobic ammonia oxidation reactor 4 through a fourth water inlet pump 5.1; gas generated by reaction in the reactor 4 is connected with the integrated short-cut denitrification anaerobic ammonia oxidation reactor 4 through an air pump 4.2; the integrated short-cut denitrification anaerobic ammonia oxidation reactor 4 is connected with a water outlet tank 6 through an electric drain valve 4.3; the sludge inlet pump 1.1 is arranged in the residual sludge fermentation tank 1, the stirring device 1.2 is positioned at one side of the sludge inlet pump 1.1 and is arranged in the residual sludge fermentation tank 1, and the right side in the residual sludge fermentation tank 1 is provided with a first sampling port 1.3; an electric drain valve 4.3 is arranged at the top end of the right side of the integrated short-cut denitrification anaerobic ammonium oxidation reactor 4, a drain pump 4.1 is arranged below the electric drain valve 4.3, an air pump 4.2 is connected to the bottom of the integrated short-cut denitrification anaerobic ammonium oxidation reactor 4, and a second sampling port 4.4, a third sampling port 4.5, a fourth sampling port 4.6 and a fifth sampling port 4.7 are sequentially arranged in the middle section of the right side of the integrated short-cut denitrification anaerobic ammonium oxidation reactor 4 from top to bottom; the upper end of the right side of the water outlet tank 6 is connected with an overflow pipe 6.1, and the lower end is connected with a drain pipe 6.2.
The treatment process of the municipal sewage in the device comprises the following steps: urban sewage enters an integrated short-cut denitrification anaerobic ammonia oxidation reactor 4 from an urban sewage raw water tank 3 through a third water inlet pump 3.1; in the integrated short-cut denitrification anaerobic ammonium oxidation reactor 4, reducing the nitric acid nitrogen of the municipal sewage into nitrite nitrogen by using a carbon source in the sludge fermentation liquor; the nitrite nitrogen of the reduction product and the ammonia nitrogen in the inlet water are taken as substrates to carry out autotrophic denitrification so as to achieve the aim of deep denitrification; after the operation of the integrated short-cut denitrification anaerobic ammonia oxidation reactor 4 is finished, precipitation and drainage are carried out, and effluent enters the effluent water tank 6 through the electric drain valve 4.3.
In the embodiment, the effective volumes of a raw municipal sewage tank 3, a fermentation liquor tank 3 and a return water tank 5 are 25L, an integrated short-cut denitrification anaerobic ammonia oxidation reactor 4 used in the test is made of organic glass, the effective volumes are 10L, and the reactors are all provided with stirrers; polyurethane foam suspended biological fillers are filled in the integrated short-cut denitrification anaerobic ammonia oxidation reactor 4, the volume filling ratio of the fillers is 45%, and a porous structure in the fillers creates an internal anoxic and external aerobic microenvironment to strengthen the denitrification effect in the integrated short-cut denitrification anaerobic ammonia oxidation reactor 4; the foam filler in the integrated short-cut denitrification anaerobic ammonia oxidation reactor 4 is used for enriching and retaining short-cut denitrifying bacteria, and the volume filling ratio of the filler is 20%; the test inoculation is to take the excess sludge of a certain sewage treatment plant, and the specific operation process of treating the urban sewage by using the device is as follows:
1) and (3) starting a system:
adding the excess sludge of the sewage treatment plant into the excess sludge fermentation tank 1 to ensure that the sludge concentration in the inoculated excess sludge fermentation tank 1 reaches 5000 mg/L;
determining the input amount of excess sludge, sludge fermentation liquor, municipal sewage and 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 the integrated short-cut denitrification anaerobic ammonia oxidation reactor 4 according to the calculation formulas (1) and (2):
V2+V3＝V·P1 (2)
wherein SCOD is SCOD concentration under the maximum fermentation potential of the excess sludge; v2、V3V is the sludge fermentation liquor, the raw water inflow of urban sewage and the effective volume of the reactor respectively; NO3 -The nitrate concentration of the municipal sewage; the value of C/N is 5: 1; p1Taking 60% as the drainage ratio;
determining the water inflow of the raw water and the return water tank according to the calculation formulas (3) and (4):
V4+V5＝V·P2 (4)
in the formula NO2 -For NO in the feed water to the return water tank2 -Concentration, NH4 +For raw water NH4 +Concentration; v4、V5And V are respectively NO2 -Solution feed, NH4 +The solution input and the effective volume of the reactor; p2Is a water discharge ratio, and has a value of 50%; NO2 -/NH4 +1.7: 1;
2) the runtime adjustment operation is as follows:
adding municipal sewage into a municipal sewage raw water tank 3, adding excess sludge into an excess sludge fermentation tank 1, starting a sludge inlet pump 1.1, and adding V at the beginning of each period1Pumping the volume of the excess sludge into a sludge fermentation tank, starting a stirring device 1.2 to uniformly mix the excess sludge, performing alkaline anaerobic fermentation on the sludge, and feeding the sludge fermentation liquor into a fermentation liquor water tank 2 through a first water inlet pump 2.1;
when the integrated short-cut denitrification anaerobic ammonia oxidation reactor 4 operates, the residual sludge fermentation tank 1 firstly carries out anaerobic stirring for 600 minutes 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 first water inlet pump 2.1 to pump the sludge fermentation liquor into the fermentation liquor water tank 2; start up theTwo water inlet pumps 2.2 are used for pumping V2Pumping the sludge fermentation liquor with the volume into an integrated short-cut denitrification anaerobic ammonia oxidation reactor 4; starting a third water inlet pump 3.1 to pump V in the urban sewage raw water tank 33In the city sewage raw water suction integral type short cut denitrification anaerobic ammonium oxidation reactor 4 of volume, make the concentration of nitric acid nitrogen in the integral type short cut denitrification anaerobic ammonium oxidation reactor 4 for setting for concentration, set for the total content of carbon and the total content concentration ratio of nitrogen and satisfy 5: 1; stirring under oxygen deficiency until the conversion rate of nitrite reaches more than 80% or the concentration of nitrate and nitrogen is less than 3 mg/L; setting the ratio of nitrite nitrogen to ammonia nitrogen at 1.7: stirring in an anoxic condition until the total inorganic nitrogen concentration is lower than 5mg/L, stopping stirring, beginning precipitation and drainage for 10 minutes, standing for 10 minutes, and entering the next reaction period;
when the integrated short-cut denitrification anaerobic ammonia oxidation reactor 4 operates, sludge needs to be discharged, so that the concentration of suspended activated sludge in the integrated short-cut denitrification anaerobic ammonia oxidation reactor 4 is maintained within the range of 2000 mg/L.
The experimental result of the embodiment shows that the excess sludge can be converted into easily degradable organic matters in the sludge fermentation stage and can be used as a supplementary 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 salt-containing wastewater, and the total nitrogen of effluent is less than 5 mg/L.
Claims (3)
1. The utility model provides a device of sludge fermentation combination shortcut denitrification anammox handles municipal sewage which characterized in that: the main structure of the device comprises a residual sludge fermentation tank, a fermentation liquor water tank, a municipal sewage raw water tank, an integrated short-cut denitrification anaerobic ammonia oxidation reactor, a return water tank and a water outlet tank; wherein the excess sludge fermentation tank is connected with a fermentation liquor water tank through a first water inlet pump; the fermentation liquid water tank is connected with the integrated short-cut denitrification anaerobic ammonia oxidation reactor through a second water inlet pump; the urban sewage raw water tank is connected with the integrated short-cut denitrification anaerobic ammonia oxidation reactor through a third water inlet pump; the integrated short-cut denitrification anaerobic ammonia oxidation reactor is connected with a reflux water tank through a drainage pump; the return water produced by the return water tank is connected with the integrated short-cut denitrification anaerobic ammonia oxidation reactor through a fourth water inlet pump; gas generated by reaction in the integrated short-cut denitrification anaerobic ammonia oxidation reactor is connected with the integrated short-cut denitrification anaerobic ammonia oxidation reactor through an air pump; the integrated short-cut denitrification anaerobic ammonia oxidation reactor is connected with a water outlet tank through an electric drain valve; the sludge inlet pump is arranged in the excess sludge fermentation tank, the stirring device is positioned on one side of the sludge inlet pump and is arranged in the excess sludge fermentation tank, and the right side in the excess sludge fermentation tank is provided with a first sampling port; an electric drain valve is arranged at the top end of the right side of the integrated short-cut denitrification anaerobic ammonia oxidation reactor, a drain pump is arranged below the electric drain valve, the bottom of the integrated short-cut denitrification anaerobic ammonia oxidation reactor is connected with an air pump, and a second sampling port, a third sampling port, a fourth sampling port and a fifth sampling port are sequentially arranged in the middle section of the right side of the integrated short-cut denitrification anaerobic ammonia oxidation reactor from top to bottom; the upper end of the right side of the water outlet tank is connected with an overflow pipe, and the lower end of the water outlet tank is connected with a drain pipe.
2. A method for treating municipal sewage using the apparatus of claim 1, wherein: the method comprises the following specific steps:
1) starting the device:
adding the excess sludge of the sewage treatment plant into an excess sludge fermentation tank, so that the sludge concentration in the inoculated sludge fermentation tank reaches 2000-6000 mg/L; adding the biofilm filler enriched with the anaerobic ammonium oxidation bacteria into the integrated short-cut denitrification anaerobic ammonium oxidation reactor, so that the biofilm filler of the anaerobic ammonium oxidation bacteria accounts for 20-80% of the effective volume of the integrated short-cut denitrification anaerobic ammonium oxidation reactor; determining the input amount of excess sludge, sludge fermentation liquor, municipal sewage and intermediate nitrite solution;
2) the runtime adjustment operation is as follows:
adding municipal sewage into a municipal sewage raw water tank, adding excess sludge into an excess sludge fermentation tank, starting a sludge feeding pump, pumping the excess sludge into the excess sludge fermentation tank at the beginning of each period, starting a stirring device to uniformly mix the excess sludge, performing sludge alkaline anaerobic fermentation, and feeding sludge fermentation liquor into a fermentation liquor water tank through a first water feeding pump;
when the integrated short-cut denitrification anaerobic ammonia oxidation reactor operates, firstly carrying out anaerobic stirring for 200-800 min in each period of the residual sludge fermentation tank, and finishing the anaerobic stirring when the SCOD value reaches more than 95% of the maximum fermentation potential; then starting a first water inlet pump to pump the sludge fermentation liquor into the fermentation liquor water tank; starting a second water inlet pump to pump the sludge fermentation liquor into the integrated short-cut denitrification anaerobic ammonia oxidation reactor; starting a third water inlet pump to pump the urban sewage raw water in the urban sewage raw water tank into the integrated short-cut denitrification anaerobic ammonia oxidation reactor, so that the concentration of the nitric acid nitrogen in the integrated short-cut denitrification anaerobic ammonia oxidation reactor meets the requirement that the concentration ratio of the total content of carbon to the total content of nitrogen is within the range of 3: 1-6: 1; stirring under oxygen deficiency until the conversion rate of nitrite reaches more than 80% or the concentration of nitrate and nitrogen is less than 3 mg/L; the ratio of nitrite nitrogen to ammonia nitrogen is within the range of 1.4: 1-2: 1, stirring in an anoxic condition until the total inorganic nitrogen concentration is lower than 5mg/L, stopping stirring, beginning precipitation and drainage for 10-15 minutes, standing for 10-15 minutes, and entering the next reaction period;
when the integrated short-cut denitrification anaerobic ammonia oxidation reactor runs, sludge needs to be discharged, so that the concentration of suspended activated sludge in the integrated short-cut denitrification anaerobic ammonia oxidation reactor is maintained within the range of 1500-2500 mg/L.
3. The method of treating municipal sewage according to claim 2, wherein: the specific process for determining the input amount of the excess sludge, the sludge fermentation liquor, the municipal sewage and the intermediate nitrite solution is as follows:
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 the integrated short-cut denitrification anaerobic ammonia oxidation reactor according to the calculation formulas (1) and (2):
V2+V3＝V·P1 (2)
wherein SCOD is SCOD concentration under the maximum fermentation potential of the excess sludge; v2、V3V is the sludge fermentation liquor, the raw water inflow of urban sewage and the effective volume of the reactor respectively; NO3 -The nitrate concentration of the municipal sewage; the value of C/N is 3: 1-6: 1; p1Taking 60% as the drainage ratio;
determining the water inflow of the raw water and the return water tank according to the calculation formulas (3) and (4):
V4+V5＝V·P2 (4)
in the formula NO2 -For NO in the feed water to the return water tank2 -Concentration, NH4 +For raw water NH4 +Concentration; v4、V5And V are respectively NO2 -Solution feed, NH4 +The solution input and the effective volume of the reactor; p2The value is 50% for the drainage ratio; NO2 -/NH4 +The value is selected within the range of 1.4: 1-2: 1.
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| CN113526668A (en) * | 2021-06-02 | 2021-10-22 | 青岛大学 | Device and method for simultaneously realizing urban sewage treatment and excess sludge reduction |
| CN114180786A (en) * | 2021-12-02 | 2022-03-15 | 北京工业大学 | Device and method for realizing short-cut denitrification and anaerobic ammonium oxidation bacteria in-situ enrichment by using sludge fermentation liquor as carbon source |
| CN115072872A (en) * | 2022-06-24 | 2022-09-20 | 北京工业大学 | Method for enhancing denitrification efficiency of municipal sewage by DEMA (Demethyl Ether-methyl acetic acid) process through fermentation carbon source |
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