CN112811612A - Single-component B-BAF filter tank device and sewage denitrification treatment method - Google Patents
Single-component B-BAF filter tank device and sewage denitrification treatment method Download PDFInfo
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- 239000010865 sewage Substances 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 102
- 239000000463 material Substances 0.000 claims abstract description 83
- 238000005273 aeration Methods 0.000 claims abstract description 70
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 58
- 241000193830 Bacillus <bacterium> Species 0.000 claims abstract description 29
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 29
- 238000011001 backwashing Methods 0.000 claims abstract description 26
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 13
- 229910052799 carbon Inorganic materials 0.000 claims description 13
- 235000015097 nutrients Nutrition 0.000 claims description 9
- 238000010992 reflux Methods 0.000 claims description 7
- 239000011435 rock Substances 0.000 claims description 7
- 239000010802 sludge Substances 0.000 claims description 7
- 239000006004 Quartz sand Substances 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 238000005276 aerator Methods 0.000 claims 3
- 239000002351 wastewater Substances 0.000 claims 3
- 238000007599 discharging Methods 0.000 claims 1
- 238000004065 wastewater treatment Methods 0.000 claims 1
- 238000005406 washing Methods 0.000 description 21
- 239000007789 gas Substances 0.000 description 10
- 239000003344 environmental pollutant Substances 0.000 description 5
- 231100000719 pollutant Toxicity 0.000 description 5
- 239000012528 membrane Substances 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 230000003203 everyday effect Effects 0.000 description 3
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 2
- 230000002354 daily effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000008103 glucose Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical group [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 description 1
- 239000002223 garnet Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
-
- 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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- C—CHEMISTRY; METALLURGY
- 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
- C02F2209/16—Total nitrogen (tkN-N)
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- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention provides a single-component B-BAF filter device and a sewage denitrification treatment method, and belongs to the technical field of sewage treatment. The single-component B-BAF filter device comprises a water inlet and backwashing air inlet pipe 1, a water distribution chamber 2, a supporting layer 3, a filter material layer 4, a water outlet chamber 5 and a water outlet pipe 6 which are sequentially connected; the return pipe 7 is connected with the water inlet and backwashing air inlet pipe 1 and the water outlet pipe 6; a bottom aeration pipe 8, wherein the bottom aeration pipe 8 is arranged in the supporting layer 3; the middle perforated aeration pipe 9 is arranged in the filter material layer 4, and the middle perforated aeration pipe 9 is arranged in the filter material layer 4; the filter material layer 4 contains bacillus. The single-component B-BAF filter device provided by the invention introduces bacillus, can form bacillus dominant flora, and performs anoxic and aerobic heterotrophic denitrification, so as to remove total nitrogen in water and ensure that the total nitrogen in the effluent is less than 1.5 mg/L.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a single-component B-BAF filter device and a sewage denitrification treatment method.
Background
In order to realize sustainable development of China's society, the requirements of China and society on environmental protection are higher and higher, and the requirements on discharge control of pollutants after sewage is treated in sewage treatment plants are stricter and stricter. At present, more than 95% of domestic sewage treatment plants execute the first-class A discharge standard of pollutant discharge Standard of urban sewage treatment plants (GB18918-2002), but with the improvement of the requirement of the society on environmental protection, even the constructed sewage treatment plants need to be upgraded and modified, so that the effluent reaches the higher pollutant discharge requirement.
The most difficult of all the emission indexes is the total nitrogen index, the effluent of developed areas at present executes the standard of four types of water on the ground surface (TN is less than or equal to 10mg/L), so the standard is called as the standard of four types of water, because the total nitrogen index can not reach the standard of four types of water (TN is less than or equal to 1.5mg/L), but the total nitrogen index can gradually improve the emission standard along with the improvement of the environmental protection requirement, particularly in environment sensitive areas such as natural protection areas and the like.
The conventional process technology aiming at domestic sewage treatment at present mainly comprises A2Various processes mainly including/O, oxidation ditch, SBR and BBR are most common, and the key point is to decompose and treat pollutants in water by using microorganisms in water. The tail water of the general urban sewage treated by the technology can generally reach the first class A standard of pollutant discharge Standard of municipal Sewage treatment plant (GB18918-2002), wherein the total nitrogen can reach below 15 mg/L. If the total nitrogen emission is further required to be improved to be less than 10mg/L, besides the BBR process, a denitrification process technology needs to be added on the basis of the conventional process, the deep denitrification process is generally at the tail end of the treatment process, and the COD of the final effluent needs to be accurately controlled besides the total nitrogen index due to the need of adding an extra carbon source, so that the problem of complex treatment process exists.
Disclosure of Invention
In view of the above, the present invention provides a single-component B-BAF filter apparatus and a sewage denitrification method. The single-component B-BAF filter device provided by the invention introduces the bacillus, can form a bacillus dominant flora, realizes anoxic and aerobic heterotrophic denitrification, and improves the denitrification effect.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a single-component B-BAF filter device, which comprises a water inlet and backwashing air inlet pipe 1, a water distribution chamber 2, a supporting layer 3, a filter material layer 4, a water outlet chamber 5 and a water outlet pipe 6 which are sequentially connected; and
the return pipe 7 is connected with the water inlet and backwashing air inlet pipe 1 and the water outlet pipe 6;
a bottom aeration pipe 8, wherein the bottom aeration pipe 8 is arranged in the supporting layer 3;
the middle perforated aeration pipe 9 is arranged in the filter material layer 4, and the middle perforated aeration pipe 9 is arranged in the filter material layer 4;
the filter material layer 4 contains bacillus.
Preferably, the middle perforated aeration pipe 9 divides the filter material layer 4 into an anoxic zone and an aeration zone, the anoxic zone is between the supporting layer 3 and the middle perforated aeration pipe 9, the aeration zone is between the middle perforated aeration pipe 9 and the water outlet chamber 5, and the volume ratio of the aeration zone to the anoxic zone is 1: 2-1: 1.
Preferably, the thickness of the aeration zone is 1-2 m, and the thickness of the anoxic zone is 1.5-2.5 m.
Preferably, the thickness of the filter material layer 4 is 2.5-4.5 m.
Preferably, the filter material of the filter material layer 4 is natural volcanic rock filter material.
Preferably, the filter material of the filter material layer 4 is a sintered volcanic rock filter material.
Preferably, the filter material of the filter material layer 4 is a ceramsite filter material and quartz sand.
Preferably, the grain size of the filter material in the filter material layer 4 is 3-8 mm.
The invention also provides a sewage denitrification treatment method, and the single-component B-BAF filter device adopting the technical scheme comprises the following steps:
after bacillus, bacillus nutrient solution and a carbon source are added into the single-component B-BAF filter device, sewage plant sludge is added into the single-component B-BAF filter device after aeration, and aeration is carried out;
and after the stuffy aeration is finished, putting sewage into the single-component B-BAF filter tank device from the water inlet and backwashing air inlet pipe (1) for sewage treatment.
Preferably, when the total nitrogen value of the sewage is less than 10mg/L, the reflux ratio of the sewage treatment is 0-50%, and when the total nitrogen value of the sewage is more than or equal to 10mg/L, the reflux ratio of the sewage treatment is 50-100%.
The invention provides a single-component B-BAF filter device, which comprises a water inlet and backwashing air inlet pipe 1, a water distribution chamber 2, a supporting layer 3, a filter material layer 4, a water outlet chamber 5 and a water outlet pipe 6 which are sequentially connected; the return pipe 7 is connected with the water inlet and backwashing air inlet pipe 1 and the water outlet pipe 6; a bottom aeration pipe 8, wherein the bottom aeration pipe 8 is arranged in the supporting layer 3; the middle perforated aeration pipe 9 is arranged in the filter material layer 4, and the middle perforated aeration pipe 9 is arranged in the filter material layer 4; the filter material layer 4 contains bacillus. The single-component B-BAF filter device provided by the invention introduces the bacillus, can form a bacillus dominant flora, performs anoxic and aerobic heterotrophic denitrification, further removes the total nitrogen in water, ensures that the total nitrogen in the effluent is less than 1.5mg/L, solves the problem that the total nitrogen is less than 3mg/L after denitrification is lack in the existing sewage treatment technology, and simultaneously realizes the control and treatment of COD standard discharge.
The invention also provides a sewage denitrification treatment method, and the single-component B-BAF filter device adopting the technical scheme comprises the following steps: after bacillus, bacillus nutrient solution and a carbon source are added into the single-component B-BAF filter device, sewage plant sludge is added into the single-component B-BAF filter device after aeration, and aeration is carried out; and after the stuffy aeration is finished, putting sewage into the single-component B-BAF filter tank device from the water inlet and backwashing air inlet pipe (1) for sewage treatment. The device of the invention is adopted to carry out denitrification treatment on sewage, and can achieve the following beneficial effects:
1) high-efficiency denitrification capability;
2) the system is simple to operate;
3) the occupied area is small;
4) the discharged water quality is good; after the tail water of the urban sewage plant, which reaches more than class A, is treated by the method, the total nitrogen of the effluent can reach four standards (less than 1.5mg/L) on the earth surface.
Drawings
Fig. 1 is a schematic structural diagram of a single-component B-BAF filter device provided by the invention, wherein 1 is a water inlet and backwashing air inlet pipe, 2 is a water distribution chamber, 3 is a supporting layer, 4 is a filter material layer, 5 is a water outlet chamber, 6 is a water outlet pipe, 7 is a return pipe, 8 is a bottom aeration pipe, and 9 is a middle perforated aeration pipe.
Detailed Description
The invention provides a single-component B-BAF filter device, which comprises a water inlet and backwashing air inlet pipe 1, a water distribution chamber 2, a supporting layer 3, a filter material layer 4, a water outlet chamber 5 and a water outlet pipe 6 which are sequentially connected; and
the return pipe 7 is connected with the water inlet and backwashing air inlet pipe 1 and the water outlet pipe 6;
a bottom aeration pipe 8, wherein the bottom aeration pipe 8 is arranged in the supporting layer 3;
the middle perforated aeration pipe 9 is arranged in the filter material layer 4, and the middle perforated aeration pipe 9 is arranged in the filter material layer 4;
the filter material layer 4 contains bacillus.
Fig. 1 is a schematic structural diagram of a single-component B-BAF filter device provided by the invention, wherein 1 is a water inlet and backwashing air inlet pipe, 2 is a water distribution chamber, 3 is a supporting layer, 4 is a filter material layer, 5 is a water outlet chamber, 6 is a water outlet pipe, 7 is a return pipe, 8 is a bottom aeration pipe, and 9 is a middle perforated aeration pipe.
In a specific embodiment of the invention, the water distribution chamber 2, the support layer 3, the filter material layer 4 and the water outlet chamber 5 are sequentially connected from bottom to top, that is, sewage flows in the direction of the water flow passing through the single-component B-BAF filter device.
In a specific embodiment of the invention, the middle perforated aeration pipe 9 divides the filter material layer 4 into an anoxic zone and an aeration zone, the anoxic zone is between the supporting layer 3 and the middle perforated aeration pipe 9, the main function of the anoxic zone is denitrification, the aeration zone is between the middle perforated aeration pipe 9 and the water outlet chamber 5, and the aeration zone mainly completes the removal of residual BOD and further denitrification treatment under the participation of aerobic denitrifying bacteria; the volume ratio of the aeration zone to the anoxic zone is preferably 1: 2-1: 1.
In one embodiment of the invention, the thickness of the aeration zone is preferably 1-2 m, and the thickness of the anoxic zone is preferably 1.5-2.5 m, or when the method is used for sewage denitrification treatment, the empty tower residence time of sewage in the aeration zone is preferably 1-2 hours, and the empty tower residence time in the anoxic zone is preferably 1.5-2.5 hours.
In an embodiment of the invention, the thickness of the filter material layer 4 is preferably 2.5-4.5 m, or the filter material layer is used for denitrification treatment of sewage, so that the empty tower residence time of the sewage in the filter material layer 4 is preferably 2.5-4.5 hours.
In a specific embodiment of the present invention, the filter material of the filter material layer 4 is preferably natural volcanic rock filter material or sintered volcanic rock filter material. The sources of the natural volcanic rock filter material and the sintered volcanic rock filter material are not particularly limited, and commercially available products well known to those skilled in the art can be adopted.
In one embodiment of the present invention, the filter material of the filter material layer 4 is preferably a ceramsite filter material and quartz sand.
In a specific embodiment of the invention, the filter material of the selected filter material layer 4 contains mineral trace nutrient elements necessary for bacillus, so that bacillus can form a microbial flora with predominant bacillus in a biological membrane system of the filter material to perform anoxic and aerobic heterotrophic denitrification, thereby removing total nitrogen in water and ensuring that the total nitrogen in the effluent is less than 1.5 mg/L.
In a specific embodiment of the present invention, the particle size of the filter material in the filter material layer 4 is preferably 3 to 8mm, and more preferably 3 to 5 mm. The grain size of the filter material can ensure the denitrification effect and avoid the problems of blockage and incapability of operating the filter.
In one embodiment of the present invention, the filtering speed of the sewage passing through the filtering material layer 4 is preferably 1-2 m/h.
In one embodiment of the present invention, the material of the supporting layer 3 is preferably cobblestone, garnet or magnetite.
The invention also provides a sewage denitrification treatment method, and the single-component B-BAF filter device adopting the technical scheme comprises the following steps:
after bacillus, bacillus nutrient solution and a carbon source are added into the single-component B-BAF filter device, sewage plant sludge is added into the single-component B-BAF filter device after aeration, and aeration is carried out;
and after the stuffy aeration is finished, putting sewage into the single-component B-BAF filter tank device from the water inlet and backwashing air inlet pipe 1 for sewage treatment.
In the invention, before the sewage denitrification treatment is carried out by using the single-component B-BAF filter device, the method preferably further comprises the step of cleaning the filter material, wherein the cleaning can remove impurities attached to the filter material. In the present invention, the washing preferably includes a first water washing, a gas water washing, and a second water washing, which are sequentially performed. In the present invention, the water or gas used for the cleaning is preferably introduced into the single-component B-BAF filter device from the water inlet and backwashing air inlet pipe 1.
In the present invention, the first water washing and the second water washing are preferably independently with sewage plant tail water or tap water.
In the invention, the time of the first water washing is preferably 12-24 h.
In the invention, the air washing time is preferably 10-15 min, and the strength is preferably 12-15L/(m)2·s)。
In the invention, the time of the gas washing is preferably 10-15 min, and the gas intensity is preferably 8-10L/(m)2S), the water strength is preferably 4-6L/(m)2·s)。
In the invention, the second water washing time is preferably 10-15 min, and the strength is preferably 12-15L/(m)2·s)。
In the invention, the steps of the first water washing, the gas water washing and the second water washing are preferably repeated 3-5 times.
According to the invention, after bacillus, a bacillus nutrient solution and a carbon source are added into the single-component B-BAF filter device, sewage plant sludge is added into the single-component B-BAF filter device after aeration, and aeration is carried out. In the invention, the stuffy aeration has the function of realizing the membrane hanging of the filter material and forming a stable biological membrane.
In the invention, the addition amount of the bacillus is preferably 0.5-1 kg per cubic meter of filter material, the addition amount of the bacillus nutrient solution is preferably 5-10 ml per cubic meter of filter material, and the addition amount of the carbon source is preferably used for maintaining the COD concentration of the filter pool to be 150-300 mg/L. In the invention, the carbon source preferably enters the single-component B-BAF filter device through the water inlet and backwashing air inlet pipe 1 by a metering pump, and the carbon source preferably is sodium acetate or glucose. In the invention, the carbon source is preferably added into the water inlet and backwashing gas inlet pipe 1 through a metering pump, and the mass of the carbon source is preferably 3-5 times of the total nitrogen content of the water inlet.
In the invention, the aeration is preferably continuous aeration for 24-48 h.
In the invention, the adding amount of the sludge of the sewage plant is preferably 1-2 kg/cubic meter of filter material.
In the present invention, the time period of the stuffy aeration is preferably 7 days.
After the stuffy aeration is finished, the single-component B-BAF filter device is preferably cultured in water at a small flow rate. In the present invention, the small-flow influent culture preferably comprises the steps of: the single-component B-BAF filter device feeds sewage to be treated from the water inlet and backwashing air inlet pipe 1, the initial flow is preferably 30% of the designed flow, 10% of the designed flow is increased every day, and finally full load water inlet is carried out, and water inlet and outlet are analyzed.
In the invention, the sewage is preferably sewage plant tail water, and the total nitrogen content of the sewage plant tail water is preferably less than 15 mg/L.
And after the stuffy aeration is finished, putting sewage into the single-component B-BAF filter tank device from the water inlet and backwashing air inlet pipe 1 for sewage treatment.
In the invention, when the total nitrogen value of the sewage is less than 10mg/L, the reflux ratio of the sewage treatment is preferably 0-50%, and when the total nitrogen value of the sewage is more than or equal to 10mg/L, the reflux ratio of the sewage treatment is preferably 50-100%.
In the present invention, it is preferable that the sewage treatment is carried out without aeration.
In the present invention, the process of sewage treatment is preferably performed with back washing every 24 hours.
In the present invention, the backwash water obtained by the backwash is preferably returned to the front end of the sewage treatment plant.
In the present invention, it is preferable to perform the gas washing, the air-water backwashing, and the water washing in this order.
In the present invention, the strength of the gas washing is preferably 10L/(m)2S), the time is preferably 2 min.
In the present invention, the gas strength of the gas-water backwash is preferably 8L/(m)2S), the water strength is preferably 6L/(m)2S), the time is preferably 10 min.
In the present invention, the washing intensity is preferably 12L/(m)2S), the time is preferably 10 min.
In order to further illustrate the present invention, the single-component B-BAF filter device and the sewage denitrification treatment method provided by the present invention will be described in detail with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
1) The implementation place is as follows: sewage treatment plant in some city of Zhejiang province
2) Overview of the processing plant: the daily treatment capacity is 1 ten thousand tons per day, the effluent reaches the first grade A, wherein the total nitrogen effluent is less than 10mg/L, and the annual temperature is 10 ℃ on average.
3) Example overview:
the apparatus used is shown in figure 1. The volume ratio of the aeration zone to the anoxic zone is 1:1, and the empty tower residence time of the sewage in the aeration zone and the anoxic zone is 1.5 hours respectively.
(2) Total nitrogen target
The total nitrogen treatment target of the embodiment is 1.5mg/L, so that a natural volcanic filter material with the thickness of 3-5 mm is selected as the filter material of the filter, the total nitrogen of tail water of a sewage plant is less than 10mg/L, the reflux ratio is 0, the reflux is not considered, the daily treatment capacity is 30-50 liters, and the volume of the filter material is 4.0L.
4) Carrying out the process
(1) Filter tank starting and debugging
After the filter material is filled, the filter material is cleaned by tail water of a sewage plant, namely the filter tank is filled with water firstly, stands for 24 hours after being filled with water fully, and is then air-washed for 12min, and the strength is 12L/(m2S), then washing with water for 12min, intensity gas 10L/(m)2S), water 4L/(m)2S) and then washed with water for 15min, strength 15L/(m)2S). Repeat 5 times.
(2) Filter material hanging membrane
A closed aeration stage:
because the volume of the filter material is 4.0L, 4g of filter material strain bacillus is added, the bacillus nutrient solution is firstly diluted by 250 times, 10mL of diluted bacillus nutrient solution is added, a carbon source (glucose) is added, the COD concentration of the added filter tank is 150-300 mg/L, after 24 hours of continuous aeration, 4g of sludge of a sewage plant is added, the carbon source is continuously added every day to maintain the COD concentration of the filter tank, and the aeration is maintained for one week.
A small-flow water inlet culture stage:
one week later, the filter tank starts to feed water, the initial flow is 30 percent of the designed flow, the 10 percent is increased every day, and finally the full load is fed, and the inlet water and the outlet water are analyzed.
(3) And after debugging is finished, normal operation is carried out, and the filter tank does not aerate during operation.
(4) Backwash was performed every 24 hours.
(5) And performing backwashing every 24 hours, and returning backwashing water to a sewage treatment plant. During backwashing, air washing is carried out firstly, and the strength and the duration are respectively 10L/(m)2S), 2 min; then air-water backwashing is carried out, and the air strength is 8L/(m)2S), water strength 6L/(m)2S) for 10 min; finally washing with water, the washing strength is 12L/(m)2S) for 10 min.
The results of the runs are shown in Table 1. As can be seen from Table 1, the device and the sewage denitrification treatment method of the invention can realize deep removal of nitrogen, and the total nitrogen after denitrification is less than 1.5 mg/L.
TABLE 1 example 1 Total Nitrogen concentration (mg/L) of influent and effluent
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (10)
1. The single-component B-BAF filter device is characterized by comprising a water inlet and backwashing air inlet pipe (1), a water distribution chamber (2), a supporting layer (3), a filter material layer (4), a water outlet chamber (5) and a water outlet pipe (6) which are sequentially connected; and
the return pipe (7), the said return pipe (7) connects the said water inflow and backwash air intake pipe (1) and discharging tube (6);
the bottom aeration pipe (8), the bottom aeration pipe (8) is arranged in the supporting layer (3);
the middle perforated aeration pipe (9), the middle perforated aeration pipe (9) is arranged in the filter material layer (4);
the filter material layer (4) contains bacillus.
2. The single-component B-BAF filter device according to claim 1, wherein the middle perforated aerator pipe (9) divides the filter material layer (4) into an anoxic zone and an aeration zone, the anoxic zone is between the support layer (3) and the middle perforated aerator pipe (9), the aeration zone is between the middle perforated aerator pipe (9) and the water outlet chamber (5), and the volume ratio of the aeration zone to the anoxic zone is 1: 2-1: 1.
3. The single-unit B-BAF filter device of claim 2, wherein the aeration zone is 1-2 m thick, and the anoxic zone is 1.5-2.5 m thick.
4. The single-unit B-BAF filter device according to claim 1 or 3, wherein the thickness of the filter material layer (4) is 2.5-4.5 m.
5. The mono-pack B-BAF filter unit according to claim 1, wherein the filter material of the filter material layer (4) is a natural volcanic filter material.
6. The single-pack B-BAF filter apparatus of claim 1, wherein the filter material of the filter material layer (4) is a sintered volcanic rock filter material.
7. The single-component B-BAF filter device according to claim 1, wherein the filter material of the filter material layer (4) is ceramsite filter material and quartz sand.
8. The single-component B-BAF filter device according to claim 1, wherein the grain size of the filter material in the filter material layer (4) is 3-8 mm.
9. A sewage denitrification treatment method, characterized in that the single-component B-BAF filter device of any one of claims 1 to 8 is used, and comprises the following steps:
after bacillus, bacillus nutrient solution and a carbon source are added into the single-component B-BAF filter device, sewage plant sludge is added into the single-component B-BAF filter device after aeration, and aeration is carried out;
and after the stuffy aeration is finished, putting sewage into the single-component B-BAF filter tank device from the water inlet and backwashing air inlet pipe (1) for sewage treatment.
10. The method for denitrification treatment of wastewater according to claim 9, wherein the reflux ratio of wastewater treatment is 0 to 50% when the total nitrogen value of the wastewater is less than 10mg/L, and 50 to 100% when the total nitrogen value of the wastewater is not less than 10 mg/L.
Priority Applications (1)
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