CN113943050A - Denitrification device and treatment process for biogas slurry - Google Patents
Denitrification device and treatment process for biogas slurry Download PDFInfo
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- 238000007034 nitrosation reaction Methods 0.000 claims abstract description 65
- 230000009935 nitrosation Effects 0.000 claims abstract description 62
- 238000002156 mixing Methods 0.000 claims abstract description 39
- 239000002131 composite material Substances 0.000 claims abstract description 38
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 230000005484 gravity Effects 0.000 claims abstract description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 80
- 239000001301 oxygen Substances 0.000 claims description 80
- 229910052760 oxygen Inorganic materials 0.000 claims description 80
- 238000005273 aeration Methods 0.000 claims description 48
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 26
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- 238000001514 detection method Methods 0.000 claims description 16
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- 229910052757 nitrogen Inorganic materials 0.000 claims description 13
- 230000001546 nitrifying effect Effects 0.000 claims description 11
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- AHEWZZJEDQVLOP-UHFFFAOYSA-N monobromobimane Chemical compound BrCC1=C(C)C(=O)N2N1C(C)=C(C)C2=O AHEWZZJEDQVLOP-UHFFFAOYSA-N 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/307—Nitrification and denitrification treatment characterised by direct conversion of nitrite to molecular nitrogen, e.g. by using the Anammox process
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/303—Nitrification and denitrification treatment characterised by the nitrification
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/305—Nitrification and denitrification treatment characterised by the denitrification
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/163—Nitrates
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/166—Nitrites
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2101/30—Organic compounds
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- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2209/11—Turbidity
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/16—Total nitrogen (tkN-N)
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Abstract
The invention provides a denitrification device for biogas slurry, which comprises a preposed ammoniation tank, a primary denitrification tank, a nitrosation tank, a secondary denitrification tank, a mobile biological bed composite denitrification tank and a complete mixing nitrification tank which are sequentially communicated through a water outlet gravity self-flow pipeline. The denitrification treatment process reasonably utilizes the nitrification-denitrification, short-cut nitrification-denitrification and anaerobic ammonia-oxygen reaction mechanisms, and can efficiently treat CODcr and BOD in the organic waste biogas slurry5、NH3N, TN and TP, the removal rate is 95% -99%, wherein TN can be removed to below 50mg/L. The device has the characteristics of stable operation, simple operation, low cost, low energy consumption, convenient maintenance and the like, and has huge market application prospect in the field of environment-friendly sewage treatment.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a denitrification device and a treatment process for biogas slurry.
Background
In the organic waste disposal industry, the wet anaerobic fermentation technology has the advantages of mature technology, capability of recovering biogas and biogas residue fertilizer, low operation cost and the like, and is widely applied to the fields of kitchen waste, livestock and poultry manure, municipal sludge, agricultural waste treatment and the like. However, after wet anaerobic fermentation of organic wastes, a certain amount of biogas slurry (about 90-100% of the organic waste treatment amount) can be generated, the nature of the biogas slurry is different according to organic solid wastes, the water quality and the components are complex on the whole, the organic matter content is high, the pollution is strong, the pollutant concentration fluctuation is large, and meanwhile, the total nitrogen content is high and the carbon-nitrogen ratio is disordered, so the treatment difficulty is large.
According to the requirements of relevant national environmental protection regulations, the biogas slurry can be discharged or recycled after being treated to reach the standard, but the treatment difficulty of total nitrogen in the biogas slurry is large, and the typical biogas slurry water quality is shown in the following table:
at present, biochemical treatment is generally adopted in the industry aiming at biogas slurry with high B/C ratio, namely a one-stage or multi-stage A/O process with a denitrification function is adopted, but the CODcr/TN of the biogas slurry is low, so that the total nitrogen of effluent is difficult to reach the standard by adopting the process, and the physicochemical processes such as ion exchange or reverse osmosis membrane treatment are adopted, so that the investment of treatment facilities and the operation cost are greatly increased.
Disclosure of Invention
The invention aims to provide a denitrification device and a treatment process for biogas slurry, aiming at the defects in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a denitrification device for biogas slurry, which comprises a preposed ammoniation tank, a primary denitrification tank, a nitrosation tank, a secondary denitrification tank, a mobile biological bed composite denitrification tank and a fully mixed nitrification tank which are sequentially communicated through a water outlet gravity self-flow pipeline, wherein the nitrosation tank is also respectively communicated with the preposed ammoniation tank and the primary denitrification tank through a nitrosation liquid pressure return pipe; the complete mixing nitrification tank is also respectively communicated with the preposed ammoniation tank, the primary denitrification tank and the secondary denitrification tank through a nitrification hydraulic pressure return pipe.
Furthermore, a stirring device and dissolved oxygen online detection equipment are arranged in the preposed ammoniation tank, the primary denitrification tank and the secondary denitrification tank.
Furthermore, an air aeration device, a temperature control controller and a dissolved oxygen online detection device are arranged in the nitrosation tank.
Furthermore, the water inlet and outlet of the mobile biological bed composite denitrification tank are provided with suspended filler intercepting components, and a suspended filler bed, air aeration equipment and dissolved oxygen online detection equipment are arranged in the suspended filler intercepting components.
Furthermore, an air aeration device and a dissolved oxygen on-line detection device are arranged in the complete mixing nitrification tank.
The invention also provides a denitrification treatment process of the biogas slurry with low carbon-nitrogen ratio and high total nitrogen, which comprises the following steps:
step S1, anaerobic treatment
The biogas slurry is pretreated to a certain degree, solid impurities more than 10mm are removed, and then the biogas slurry is conveyed or automatically flows into a preposed ammoniation tank through a pump, and dissolved oxygen in the preposed ammoniation tank is controlled to be 0-0.05 mg/LThe stirring intensity is 5 to 10W/m3Carrying out nitration reaction for 0.5-1 d;
step S2, first-stage anoxic treatment
The effluent of the pre-ammonification tank in the step S1 automatically flows into a primary denitrification tank, and dissolved oxygen in the primary denitrification tank is controlled to be 0.2-0.4 mg/L, and the stirring intensity is controlled to be 5-15W/m3Fully mixing and contacting a large amount of organic matters and alkalinity contained in the effluent with nitrosation liquid refluxed in the nitrosation tank and nitration liquid refluxed in the completely mixed nitration tank at a pH value of 7-8.5, and synchronously performing denitrification and shortcut nitrification-denitrification for 0.5-1.5 d;
step S3, aerobic activated sludge treatment
The effluent of the primary denitrification tank in the step S2 automatically flows into a nitrosation tank, dissolved oxygen in the nitrosation tank is controlled to be 1.5-2.0 mg/L, the temperature is 25-35 ℃, and the pH value is 7-8.5, aerobic microorganism degradation reaction, nitrosation reaction and nitration reaction are carried out, and the treatment time is 2.0-4.0 d;
step S4, secondary anoxic treatment
Enabling effluent of the nitrosation tank in the step S3 to automatically flow into a secondary denitrification tank, controlling dissolved oxygen in the secondary denitrification tank to be 0.3-0.5 mg/L and controlling the pH value to be 7-8.5, and performing denitrification for 0.5-1.5 d;
step S5, aerobic biofilm treatment
The effluent of the secondary denitrification tank in the step S4 automatically flows into a mobile biological bed composite denitrification tank, the dissolved oxygen in the mobile biological bed composite denitrification tank is controlled to be 2.0-3.0 mg/L and the pH value is controlled to be 7-8.5, the residual total nitrogen in the effluent is subjected to nitrification and denitrification and short-cut nitrification and denitrification, and the treatment time is 1.0-2.0 d;
step S6, final aerobic treatment
And S5, enabling the effluent of the mobile biological bed composite denitrification tank to automatically flow into a complete mixing nitrification tank, controlling the dissolved oxygen content in the complete mixing nitrification tank to be 3.0-4.5 mg/L and the pH value to be 7-9, carrying out aerobic nitrification reaction, and finishing denitrification treatment with the treatment time of 1.0-2.0 d.
Further, in step S3, the nitrosation liquid reflux ratio in the nitrosation pool is 0.5: 10.0.
Further, in step S5, the particle size of the suspended filler in the composite denitrification tank of the moving biological bed is 10-25 mm.
Further, in step S6, the reflux ratio of the nitrifying liquid in the complete mixing nitrification tank is 1.0: 5.0.
The technical scheme provided by the invention has the beneficial effects that:
(1) the invention provides a denitrification device for biogas slurry with low carbon-nitrogen ratio and high total nitrogen, which comprises a preposed ammoniation tank, a primary denitrification tank, a nitrosation tank, a secondary denitrification tank, a mobile biological bed composite denitrification tank and a completely mixed nitrification tank which are sequentially communicated through a water outlet gravity flow pipeline.
(2) The denitrification treatment process of the biogas slurry with low carbon-nitrogen ratio and high total nitrogen provided by the invention combines a denitrification device, controls the conditions of biochemical reaction in each treatment section such as dissolved oxygen, pH value, temperature and the like, reasonably utilizes the nitrification-denitrification, short-cut nitrification-denitrification and anaerobic ammonia-oxygen reaction mechanisms, and can efficiently treat CODcr and BOD in the organic waste biogas slurry5、NH3N, TN and TP, the removal rate is 95% -99%, wherein TN can be removed to below 50 mg/L.
(3) The denitrification device provided by the invention has the characteristics of stable operation, simple operation, low cost, low energy consumption, convenience in maintenance and the like, and has a huge market application prospect in the field of environment-friendly sewage treatment.
Drawings
FIG. 1 is a schematic structural diagram of a denitrification apparatus for biogas slurry according to the present invention;
FIG. 2 is a flow chart of a denitrification treatment process of biogas slurry provided by the invention.
1. A preposed ammonification tank; 2. a first-stage denitrification tank; 3. a nitrosation tank; 31. a nitrosation liquid pressure return pipe; 4. a secondary denitrification tank; 5. a mobile biological bed composite denitrification tank; 6. a complete mixing nitrification tank; 61. a nitrifying liquid pressure return pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings and examples.
As shown in figure 1, the denitrification device for biogas slurry provided by the invention comprises a preposed ammoniation tank 1, a primary denitrification tank 2, a nitrosation tank 3, a secondary denitrification tank 4, a mobile biological bed composite denitrification tank 5 and a completely mixed nitrification tank 6 which are sequentially communicated through a water outlet gravity self-flow pipeline, wherein the nitrosation tank 3 is respectively communicated with the preposed ammoniation tank 1 and the primary denitrification tank 2 through a nitrosation hydraulic pressure return pipe 31, and the completely mixed nitrification tank 6 is respectively communicated with the preposed ammoniation tank 1, the primary denitrification tank 2 and the secondary denitrification tank 4 through a nitrification hydraulic pressure return pipe 61. On the basis of conventional nitrification and denitrification, short-cut nitrification and denitrification processes with lower energy consumption and anaerobic ammonia oxidation denitrification processes are combined, so that high-efficiency and low-cost denitrification is finally realized, and the method is particularly suitable for biogas slurry treatment with high pollutant concentration, high total nitrogen content and low carbon-nitrogen ratio.
The structure of the preposed ammoniation tank 1, the primary denitrification tank 2 and the secondary denitrification tank 4 is not limited, the preposed ammoniation tank, the primary denitrification tank and the secondary denitrification tank can be cuboid or cylindrical, the tank adopts a steel concrete structure or an equipment form, and can be built together with other tanks, the farthest diagonal positions are respectively provided with a water inlet and a water outlet, meanwhile, the side of the water inlet is provided with a nitrosation liquid and nitrification liquid backflow inlet, and the tanks are all provided with mechanical stirring devices and are matched with dissolved oxygen online detection equipment.
The nitrosation pond 3 is not limited in structure, can be in a cuboid or cylinder shape, can also be formed by connecting a single pond or two ponds in series, adopts a steel concrete structure or an equipment form, can be co-built with other ponds on the wall, is provided with a water inlet and a water outlet at the farthest positions of opposite angles respectively, is internally provided with an air aeration device, is matched with a temperature controller and dissolved oxygen online detection equipment, and controls the working load of the aeration device through dissolved oxygen content feedback.
The structure of the mobile biological bed composite denitrification tank 5 is not limited, the mobile biological bed composite denitrification tank can be in a cuboid or cylinder shape, a steel concrete structure or an equipment form is adopted, the mobile biological bed composite denitrification tank can be built together with other tanks on the same wall, the farthest positions of the opposite angles are respectively provided with a water inlet and a water outlet, the water inlet and the water outlet are respectively provided with a suspended filler intercepting device, a suspended filler bed and an air aeration device are arranged in the tank, and the tank is matched with a dissolved oxygen online detection device, and the working load of the aeration device is controlled through dissolved oxygen content feedback.
The structure of the complete mixing nitrification tank 6 is not limited, the complete mixing nitrification tank can be in a cuboid or cylinder shape, a steel concrete structure or an equipment form is adopted, the complete mixing nitrification tank can be built together with other tanks, the farthest positions of the opposite corners are respectively provided with a water inlet and a water outlet (when the rear end adopts a pressure water outlet process, the water outlet can be changed into a water suction port of a pressure water outlet system), air aeration equipment is arranged in the tank, and is matched with dissolved oxygen online detection equipment, and the working load of the aeration equipment is controlled through dissolved oxygen content feedback. The water outlet of the complete mixing nitrification tank 6 is actually provided with water and activated sludge microorganisms inside, the water outlet of the complete mixing nitrification tank 6 can be communicated with a mud-water separation device, and the sludge separated by the mud-water separation device is taken as microbial strains to flow back to the preposed ammoniation tank 1.
As shown in fig. 2, the invention also provides a denitrification treatment process for low carbon-nitrogen ratio high total nitrogen biogas slurry by using the device, which comprises the following steps:
the biogas slurry generated after the anaerobic fermentation of organic wastes is subjected to certain pretreatment, after solid impurities more than 10mm are removed, the biogas slurry is conveyed or automatically flows by a pump from a water inlet of a preposed ammoniation tank to enter the preposed ammoniation tank, the preposed ammoniation tank belongs to an anaerobic treatment process, the content of organic nitrogen in the biogas slurry is higher, the prior environment of ammoniation flora microorganisms cannot be realized in a conventional A/O tank, so that the nitrification reaction does not have enough ammonium nitrogen, the nitrification effect is influenced, and the total nitrogen removal efficiency of effluent is finally influenced. On the other hand, the ammonification reaction tank also has hydrolysis and acidification functions, and carries out ring opening and chain scission aiming at macromolecular refractory organic matters in the biogas slurryAnd the subsequent biochemical treatment effect of the organic matters is ensured. The pre-ammonification tank is generally controlled to have a dissolved oxygen concentration below 0.05mg/L and a stirring intensity of 5-10W/m3The sludge of the same kind of project or the sludge of a municipal sewage plant can be used for inoculation culture.
Effluent of the preposed ammoniation tank automatically flows into a first-stage denitrification tank through a water outlet, the first-stage denitrification tank belongs to an anoxic treatment process, a large amount of organic matters and alkalinity contained in the effluent of the preposed ammoniation tank are fully mixed and contacted with nitrosation liquid flowing back from the nitrosation tank and nitrification liquid flowing back from a completely mixed nitrification tank, denitrification and shortcut nitrification denitrification are synchronously performed, the concentration of dissolved oxygen in the first-stage denitrification tank is generally controlled to be 0.2-0.4 mg/L (controlled by blending backflow nitrosation liquid and nitrification liquid in different proportions), and the stirring intensity is 10-15W/m3And the pH value is 7-8.5, and similar project sludge or municipal sewage plant sludge can be adopted for inoculation culture.
Effluent of the first-stage denitrification tank automatically flows into a nitrosation tank through a water outlet, the nitrosation tank belongs to an aerobic activated sludge treatment process, aerobic microbial degradation and nitrosation and nitration processes of organic matters are mainly carried out, the reaction process is controlled to be in a nitrosation reaction stage as much as possible by controlling reaction conditions in the tank, the nitrosation tank generally controls the dissolved oxygen concentration to be 1.5-2.0 mg/L (controlled by aeration quantity of an aeration device), the pH value is 7-8.5, the temperature in the tank is 25-35 ℃ (controlled by a cooling heat exchange system and a steam heating system), and similar project sludge or municipal sewage plant sludge can be adopted for inoculation culture.
Effluent of the nitrosation tank automatically flows into a secondary denitrification tank through a water outlet, the secondary denitrification tank belongs to an anoxic treatment process, most of effluent treated by the nitrosation tank flows back to the front end, and the rest of effluent is further subjected to denitrification in the secondary denitrification tank to remove nitrite and nitrate in the effluent, so that the inhibition on subsequent reaction is reduced, reaction conditions are created for the subsequent reaction tank, the secondary denitrification tank generally controls the dissolved oxygen concentration to be 0.2-0.5 mg/L (controlled by the return nitration liquid amount of the completely-mixed nitrification tank), the pH value is 7-8.5, and similar project sludge or municipal sewage plant sludge can be adopted for inoculation culture.
The effluent of the secondary denitrification tank automatically flows into a mobile biological bed composite denitrification tank through a water outlet, the mobile biological bed composite denitrification tank belongs to an aerobic biological membrane treatment process, mainly deeply removes the residual total nitrogen in the effluent after front end treatment, suspended MBBR fillers are arranged in the tank, after each filler forms a biological membrane package, an aerobic-anoxic-anaerobic composite environment can be formed from outside to inside, the residual total nitrogen in the effluent treated by the secondary denitrification tank directly completes the nitrification-denitrification and short-cut nitrification-denitrification processes in the process of fully mixing and contacting with the biological membrane and sequentially passes through aerobic-anoxic zones, meanwhile, an anaerobic ammonia oxidation process can be further realized in an anaerobic zone inside the biological membrane, the key of the anaerobic ammonia oxidation process lies in anaerobic ammonia oxidizing bacteria, and the requirement on the growth environment is strict, the biological membrane wrapping ensures the stable growth environment of the anaerobic ammonia oxidation bacteria, the pollutants such as nitrate, nitrite and the like with inhibiting effect on the anaerobic ammonia oxidation bacteria are blocked, and meanwhile, a series of treatment at the front end also ensures the lower level of toxic and inhibiting pollution factors, so that the process section can simultaneously realize nitrification and denitrification, short-cut nitrification and denitrification and anaerobic ammonia oxidation processes, the denitrification efficiency and the denitrification effect are ensured, the dissolved oxygen concentration of the mobile biological bed composite denitrification tank is generally controlled to be 2.0-3.0 mg/L (controlled by the aeration quantity of the aeration device), the pH is 7-8.5 (controlled by the additional alkalinity), and the sludge of the same kind of project or the sludge of the municipal sewage plant can be used for inoculation culture.
The effluent of the mobile biological bed composite denitrification tank automatically flows into a complete mixing nitrification tank through a water outlet, the complete mixing nitrification tank belongs to an aerobic treatment process, can be adjusted to operate in an activated sludge process or biofilm process mode according to needs, and is mainly used for finally removing process effluent to ensure the final treatment effluent effect, the complete mixing nitrification tank is generally controlled to have dissolved oxygen concentration of 3.0-4.5 mg/L (controlled by aeration quantity of an aeration device) and pH of 7-9, and similar project sludge or municipal sewage plant sludge inoculation culture can be adopted.
The effect of the denitrification apparatus and treatment process of the present invention will be described and demonstrated by the following specific examples.
Example 1
Waste water from the Clarity areaProcessing items, the processing scale being 100m3/d。
The preposed ammoniation tank 1, the primary denitrification tank 2, the nitrosation tank 3, the secondary denitrification tank 4, the mobile biological bed composite denitrification tank 5 and the complete mixing nitrification tank 6 designed by the project are all of steel concrete structures and are built with walls, the effective volume ratio of each water tank is 1:1.7:5.1: 1.1:1.3, the tanks are mutually connected and are communicated through reserved water through holes on the tank walls with the plane size of 1.0m multiplied by 1.0m, and special filler intercepting and separating devices are arranged on communication holes between the secondary denitrification tank 4 and the mobile biological bed composite denitrification tank 5, between the mobile biological bed composite denitrification tank 5 and the complete mixing nitrification tank 6 and have in-situ and ex-situ cleaning functions. The pretreated biogas slurry enters the preposed ammoniation tank 1 from the lower left side, meanwhile, a nitrosation liquid reflux port with the diameter of 150mm and a nitrification liquid and sludge reflux port with the diameter of 100mm are arranged on the lower left side, a submersible stirrer (or a hydraulic stirring mode) is arranged in the tank, dissolved oxygen in the tank is detected in real time by a dissolved oxygen online detector arranged in the tank, and the concentration of the dissolved oxygen in the tank is controlled by adjusting the nitrosation liquid, the nitrification liquid and the sludge reflux amount with different sizes. The left lower part of the first-stage denitrification tank 2 is provided with 100 mm-diameter nitrosation liquid and 100 mm-diameter nitrifying liquid reflux ports, a submersible stirrer (which can also adopt a hydraulic stirring mode) is arranged in the tank, dissolved oxygen in the tank is detected in real time by a dissolved oxygen online detector arranged in the tank, and the concentration of the dissolved oxygen in the tank is controlled by adjusting the nitrosation liquid and the nitrifying liquid reflux amount with different sizes. Nitrosation pond 3 is two altogether and establishes ties, the water inlet is at left downside, the delivery port is at right downside, respectively be provided with 12 routes jet aeration head 1 in the pond, aeration head upper portion 200 mm's pipe diameter interface provides the air access by roots blower, lower part 250 mm's pipe diameter interface provides the water source access by the water pump, provide dissolved oxygen and hybrid agitation power for nitrosation pond 3, under some circumstances, jet aeration head also can adopt the diameter to be replaced for 215 mm's micropore aeration dish or diameter are 63mm ~ 110 mm's micropore pipe, be provided with dissolved oxygen and temperature on-line monitoring equipment in the nitrosation pond 3, the accessible is adjusted the interior dissolved oxygen level of roots blower operation condition control nitrosation pond, and simultaneously, the supporting cooling tower system control nitrosation pond temperature that is provided with, start the cooling when the temperature exceedes a definite value. The water inlet of the second-stage denitrification tank 4 is positioned at the upper left, a submersible stirrer is arranged in the second-stage denitrification tank, a nitrifying liquid reflux port with the diameter of 150mm is arranged at the upper left, dissolved oxygen online detection equipment is arranged in the second-stage denitrification tank, and the concentration of the dissolved oxygen in the second-stage denitrification tank is controlled by adjusting the reflux amount of the nitrifying liquid. Remove 5 water inlets in the compound denitrogenation pond of biological bed and be located upper left side, the delivery port is located left downside, it is 1 that suspension packed bed and 6 route efflux aeration head are provided in the pond, aeration head upper portion 150 mm's pipe diameter interface provides the air access by the roots blower, lower part 150 mm's pipe diameter interface provides the water source access by the water pump, for removing compound denitrogenation pond of biological bed 5 provides dissolved oxygen and hybrid stirring power, some cases, the efflux aeration head also can adopt the diameter to replace for 215 mm's micropore aeration dish or diameter is 63mm ~ 110 mm's micropore pipe, the supporting dissolved oxygen on-line measuring system in the pond, the accessible is adjusted the interior dissolved oxygen level of the compound denitrogenation pond of roots blower operation condition control removal biological bed. The complete mixing nitrification tank 6 is a final water outlet tank, 1 6 path jet aeration heads are arranged in the tank, the 150mm pipe diameter interface at the upper part of the aeration head is accessed by air provided by a Roots blower, the 150mm pipe diameter interface at the lower part is accessed by a water source provided by a water pump, dissolved oxygen and mixing stirring power are provided for the mobile biological bed composite denitrification tank 5, under some conditions, the jet aeration head can also be replaced by a microporous aeration disc with the diameter of 215mm or a microporous pipe with the diameter of 63 mm-110 mm, a dissolved oxygen online detection device is matched in the tank, the dissolved oxygen level in the complete mixing nitrification tank can be controlled by adjusting the operation condition of the Roots blower, the effluent is pumped to a subsequent mud-water separation system through an effluent water pump arranged on the left lower side of the tank, the external tubular ultrafiltration membrane system is adopted in the mud-water separation system, the system is unnecessary, and a sedimentation tank form can be adopted in some cases.
In the denitrification device of the embodiment, a water inlet pump, a submersible stirrer and a dissolved oxygen online detector are arranged in a front ammoniation tank 1; a submersible stirrer and a dissolved oxygen online detector are arranged in the primary denitrification tank 2; a jet flow aeration head, a roots blower, a jet flow circulating pump, a defoaming pump, a plate heat exchanger, a cooling tower, a nitrosation liquid reflux pump, a dissolved oxygen online detector and a temperature online detector are arranged in the sub-digestion tank 3; a submersible stirrer and a dissolved oxygen online detector are arranged in the secondary denitrification tank 4; a jet aeration head, a Roots blower, a jet circulating pump, a suspended filler, an inlet and outlet filler intercepting and separating device and a dissolved oxygen online detector are arranged in the mobile biological bed composite denitrification tank 5; the complete mixing nitrification tank 6 is internally provided with a jet aeration head, a Roots blower, a jet circulating pump, a suspended filler, a water outlet pump and a dissolved oxygen online detector.
The data of the main pollution factors in the wastewater without denitrification process in this example are shown in Table 1.
Table 1:
in this embodiment, after the sewage is treated, the sampling point is the mixed liquid at the water outlet of the complete mixing nitrification tank 6, and the measured values of the main pollution factors of the supernatant after standing are shown in table 2.
Table 2:
completely meets the requirements of the Water quality Standard for Sewage discharge into cities and towns (GB/T31962-2015), and the indexes are shown in Table 3.
Example 2
A Chuzhou kitchen waste biogas slurry treatment project with the treatment scale of 140m3/d。
The preposed ammoniation tank 1, the primary denitrification tank 2, the nitrosation tank 3, the secondary denitrification tank 4, the mobile biological bed composite denitrification tank 5 and the complete mixing nitrification tank 6 designed by the project are all of steel concrete structures and are built with walls, the effective volume ratio of the tanks is 1:1.8:2.9: 1.8:1.8, the tanks are mutually connected and are communicated through reserved water through holes on the tank walls with the plane size of 1.0m multiplied by 1.0m, and special filler intercepting and separating devices are arranged on the communication holes between the secondary denitrification tank 4 and the mobile biological bed composite denitrification tank 5, between the mobile biological bed composite denitrification tank 5 and the complete mixing nitrification tank 6 and have in-situ and ex-situ cleaning functions. The pretreated biogas slurry enters a preposed ammoniation tank 1 from the upper right side, meanwhile, a nitrosation liquid reflux port with the diameter of 150mm and a nitrification liquid and sludge reflux port with the diameter of 100mm are arranged at the lower left side, a submersible stirrer (or a hydraulic stirring mode) is arranged in the tank, dissolved oxygen in the tank is detected in real time by a dissolved oxygen online detector arranged in the tank, and the concentration of the dissolved oxygen in the tank is controlled by adjusting the nitrosation liquid, the nitrification liquid and the sludge reflux amount with different sizes. The upper right part of the first-level denitrification tank 2 is provided with 100 mm-diameter nitrosation liquid and 100 mm-diameter nitrifying liquid reflux ports, a submersible stirrer (which can also adopt a hydraulic stirring mode) is arranged in the tank, dissolved oxygen in the tank is detected in real time by a dissolved oxygen online detector arranged in the tank, and the concentration of the dissolved oxygen in the tank is controlled by adjusting the nitrosation liquid and the nitrifying liquid reflux amount with different sizes. 3 water inlets in nitrosation pond on the upper right side, the delivery port is at left downside, be provided with 2 jet aeration heads in 12 routes in the pond, aeration head upper portion 200 mm's pipe diameter interface provides the air access by roots blower, lower part 250 mm's pipe diameter interface provides the water source access by the water pump, provide dissolved oxygen and hybrid agitation power for nitrosation pond 3, under some circumstances, jet aeration head also can adopt the diameter to be replaced for 215 mm's micropore aeration dish or diameter is 63mm ~ 110 mm's micropore pipe, be provided with dissolved oxygen and temperature on-line monitoring system in the nitrosation pond 3, the accessible is adjusted the interior dissolved oxygen level of roots blower operation condition control nitrosation pond 3, and simultaneously, the supporting cooling tower system control nitrosation pond 3 temperature that is provided with, start the cooling when the temperature exceedes a definite value. The water inlet of the second-stage denitrification tank 4 is positioned at the lower right side, a submersible stirrer is arranged in the second-stage denitrification tank, a nitrifying liquid reflux port with the diameter of 150mm is arranged at the lower right side, a dissolved oxygen online detection system is arranged in the second-stage denitrification tank, and the concentration of dissolved oxygen in the second-stage denitrification tank is controlled by adjusting the reflux quantity of the nitrifying liquid. Remove 5 water inlets of biological bed composite denitrification pond and be located left downside, the delivery port is located the upper right side, it is 1 that suspension packed bed and 6 route efflux aeration head are provided in the pond, aeration head upper portion 150 mm's pipe diameter interface provides the air access by the roots blower, lower part 150 mm's pipe diameter interface provides the water source access by the water pump, for removing biological bed composite denitrification pond 5 and providing dissolved oxygen and hybrid agitation power, some cases, the efflux aeration head also can adopt the diameter to be replaced for 215 mm's micropore aeration dish or diameter is 63mm ~ 110 mm's micropore pipe, the supporting dissolved oxygen on-line measuring system in the pond, the accessible is adjusted the interior dissolved oxygen level of roots blower operation condition control removal biological bed composite denitrification pond 5. The complete mixing nitrification tank 6 is a final water outlet tank, 1 6 path jet aeration heads are arranged in the tank, the 150mm pipe diameter interface at the upper part of the aeration head is accessed by air provided by a Roots blower, the 150mm pipe diameter interface at the lower part is accessed by a water source provided by a water pump, dissolved oxygen and mixing stirring power are provided for the mobile biological bed composite denitrification tank 5, under some conditions, the jet aeration head can also be replaced by a microporous aeration disc with the diameter of 215mm or a microporous pipe with the diameter of 63 mm-110 mm, a dissolved oxygen online detection system is matched in the tank, the dissolved oxygen level in the complete mixing nitrification tank 5 can be controlled by adjusting the operation condition of the roots blower, the effluent is pumped to a subsequent mud-water separation system through an effluent water pump arranged on the left upper side of the tank, the external tubular ultrafiltration membrane system is adopted in the mud-water separation system, the system is unnecessary, and a sedimentation tank form can be adopted in some cases.
In the denitrification device of the embodiment, a water inlet pump, a submersible stirrer and a dissolved oxygen online detector are arranged in a front ammoniation tank 1; a submersible stirrer and a dissolved oxygen online detector are arranged in the primary denitrification tank 2; a jet flow aeration head, a roots blower, a jet flow circulating pump, a defoaming pump, a plate heat exchanger, a cooling tower, a nitrosation liquid reflux pump, a dissolved oxygen online detector and a temperature online detector are arranged in the sub-digestion tank 3; a submersible stirrer and a dissolved oxygen online detector are arranged in the secondary denitrification tank 4; a jet aeration head, a Roots blower, a jet circulating pump, a suspended filler, an inlet and outlet filler intercepting and separating device and a dissolved oxygen online detector are arranged in the mobile biological bed composite denitrification tank 5; the complete mixing nitrification tank 6 is internally provided with a jet aeration head, a Roots blower, a jet circulating pump, a suspended filler, a water outlet pump and a dissolved oxygen online detector.
The data of the main pollution factors in the wastewater without denitrification process in this example are shown in Table 4.
Table 4:
in this embodiment, after the sewage is treated, the sampling point is the mixed liquid at the water outlet of the complete mixing nitrification tank 6, and the measured values of the main pollution factors of the clear liquid after being filtered by the tubular ultrafiltration membrane are shown in table 5 below.
Table 5:
further, a nanofiltration and reverse osmosis advanced treatment process is adopted, so that the final effluent can be ensured to completely reach the process and product water standard in the urban sewage recycling industrial water quality (GB/T l9923-2005) standard, and as shown in Table 6, the recovered water can be used as process water and flushing water of a project, and is economical and environment-friendly.
Table 6:
the features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A denitrification device of biogas slurry is characterized in that: comprises a preposed ammoniation tank, a primary denitrification tank, a nitrosation tank, a secondary denitrification tank, a mobile biological bed composite denitrification tank and a complete mixing nitrification tank which are sequentially communicated through an effluent gravity self-flow pipeline,
the nitrosation tank is also respectively communicated with the preposed ammoniation tank and the primary denitrification tank through a nitrosation liquid pressure return pipe;
the complete mixing nitrification tank is also respectively communicated with the preposed ammoniation tank, the primary denitrification tank and the secondary denitrification tank through a nitrification hydraulic pressure return pipe.
2. The denitrification apparatus for biogas slurry as claimed in claim 1, wherein: and stirring devices and dissolved oxygen online detection equipment are arranged in the preposed ammoniation tank, the primary denitrification tank and the secondary denitrification tank.
3. The denitrification apparatus for biogas slurry as claimed in claim 1, wherein: an air aeration device, a temperature control controller and a dissolved oxygen online detection device are arranged in the nitrosation tank.
4. The denitrification apparatus for biogas slurry as claimed in claim 1, wherein: the water inlet and outlet of the mobile biological bed composite denitrification tank are provided with suspended filler intercepting components, and a suspended filler bed, air aeration equipment and dissolved oxygen online detection equipment are arranged in the mobile biological bed composite denitrification tank.
5. The denitrification apparatus for biogas slurry as claimed in claim 1, wherein: and an air aeration device and a dissolved oxygen online detection device are arranged in the complete mixing nitrification tank.
6. A denitrification treatment process of biogas slurry is characterized by comprising the following steps: this is achieved with the device according to any of claims 1-5, comprising the steps of:
s1 anaerobic treatment
The biogas slurry is pretreated to a certain degree, solid impurities more than 10mm are removed, and then the biogas slurry is conveyed or automatically flows into a preposed ammoniation tank through a pump, and dissolved oxygen in the preposed ammoniation tank is controlled to be 0-0.05 mg/L, and the stirring intensity is controlled to be 5-10W/m3Carrying out nitration reaction for 0.5-1 d;
s2, first-stage anoxic treatment
The effluent of the pre-ammonification tank in the step S1 automatically flows into a primary denitrification tank, and dissolved oxygen in the primary denitrification tank is controlled to be 0.2-0.4 mg/L, and the stirring intensity is controlled to be 5-15W/m3Fully mixing and contacting a large amount of organic matters and alkalinity contained in the effluent with nitrosation liquid refluxed in the nitrosation tank and nitration liquid refluxed in the completely mixed nitration tank at a pH value of 7-8.5, and synchronously performing denitrification and shortcut nitrification-denitrification for 0.5-1.5 d;
s3 aerobic activated sludge treatment
The effluent of the primary denitrification tank in the step S2 automatically flows into a nitrosation tank, dissolved oxygen in the nitrosation tank is controlled to be 1.5-2.0 mg/L, the temperature is 25-35 ℃, and the pH value is 7-8.5, aerobic microorganism degradation reaction, nitrosation reaction and nitration reaction are carried out, and the treatment time is 2.0-4.0 d;
s4, secondary anoxic treatment
Enabling effluent of the nitrosation tank in the step S3 to automatically flow into a secondary denitrification tank, controlling dissolved oxygen in the secondary denitrification tank to be 0.3-0.5 mg/L and controlling the pH value to be 7-8.5, and performing denitrification for 0.5-1.5 d;
s5 aerobic biofilm treatment
The effluent of the secondary denitrification tank in the step S4 automatically flows into a mobile biological bed composite denitrification tank, the dissolved oxygen in the mobile biological bed composite denitrification tank is controlled to be 2.0-3.0 mg/L and the pH value is controlled to be 7-8.5, the residual total nitrogen in the effluent is subjected to nitrification and denitrification and short-cut nitrification and denitrification, and the treatment time is 1.0-2.0 d;
s6 aerobic treatment at tail end
And S5, enabling the effluent of the mobile biological bed composite denitrification tank to automatically flow into a complete mixing nitrification tank, controlling the dissolved oxygen content in the complete mixing nitrification tank to be 3.0-4.5 mg/L and the pH value to be 7-9, carrying out aerobic nitrification reaction, and finishing denitrification treatment with the treatment time of 1.0-2.0 d.
7. The denitrification process according to claim 6, wherein: in step S3, the nitrosation liquid reflux ratio in the nitrosation pool is 0.5: 10.0.
8. The denitrification process according to claim 6, wherein: in step S5, the particle size of the suspended filler in the composite denitrification tank of the mobile biological bed is 10-25 mm.
9. The denitrification process according to claim 6, wherein: in step S6, the reflux ratio of the nitrifying liquid in the complete mixing nitrification tank is 1.0: 5.0.
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| CN105776740A (en) * | 2016-03-23 | 2016-07-20 | 天津派瑞环境工程技术有限公司 | Treatment method and equipment for up-to-standard discharging of vitamin fermentation pharmaceutical wastewater |
| CN110386731A (en) * | 2019-08-05 | 2019-10-29 | 青岛思普润水处理股份有限公司 | A kind of mainstream autotrophic denitrification system and method based on MBBR |
| CN112979075A (en) * | 2021-02-26 | 2021-06-18 | 天津凯英科技发展股份有限公司 | Zero-carbon-source-added biogas slurry denitrification method and application thereof |
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| CN105776740A (en) * | 2016-03-23 | 2016-07-20 | 天津派瑞环境工程技术有限公司 | Treatment method and equipment for up-to-standard discharging of vitamin fermentation pharmaceutical wastewater |
| CN110386731A (en) * | 2019-08-05 | 2019-10-29 | 青岛思普润水处理股份有限公司 | A kind of mainstream autotrophic denitrification system and method based on MBBR |
| CN112979075A (en) * | 2021-02-26 | 2021-06-18 | 天津凯英科技发展股份有限公司 | Zero-carbon-source-added biogas slurry denitrification method and application thereof |
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