CN212222728U - Sewage treatment system of ultra-high filtration speed denitrification biological filter - Google Patents
Sewage treatment system of ultra-high filtration speed denitrification biological filter Download PDFInfo
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- CN212222728U CN212222728U CN202020248397.7U CN202020248397U CN212222728U CN 212222728 U CN212222728 U CN 212222728U CN 202020248397 U CN202020248397 U CN 202020248397U CN 212222728 U CN212222728 U CN 212222728U
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Abstract
The utility model discloses a sewage treatment system of a denitrification biological filter with an ultra-high filtration speed, wherein the denitrification biological filter system with the ultra-high filtration speed is formed by sequentially connecting an inner water inlet pore plate grid, the denitrification biological filter with the ultra-high filtration speed and a clean water tank in series; the clean water tank is connected with the ultra-high filtration speed denitrification biological filter through a back washing water system; the aperture of the internal water inlet pore plate grid is not more than 1 mm; the utility model solves the problem of filter tank blockage caused by water inflow of fibrous materials, adopts the core thought method of thin-layer high-efficiency active biological membrane with high filtration speed, short-layer high-efficiency filter material layer and high shear ratio, combines the method for preventing excessive suspended matters from blocking the high-efficiency filter material layer, ensures the high-efficiency stable operation of the denitrification biological filter with ultrahigh filtration speed by forced backwashing, and solves the problem that the high-efficiency filter material runs off due to backwashing; the utility model discloses carry the mark to sewage and have very big popularization and application and worth.
Description
Technical Field
The utility model belongs to the technical field of water pollution control, concretely relates to sewage treatment system in high filtration rate denitrogenation biological filter.
Background
With the increasingly prominent water pollution problem in China, the improvement of the discharge standard of urban sewage treatment is a great trend. From the requirement of improving the quality of the current water environment, the effluent treated by a plurality of municipal sewage treatment plants is often discharged into a municipal river to become a water body of the river. The effluent of the existing sewage treatment plant in China has the discharge standard which is mainly referred to primary B or primary A in GB18918-2002 discharge Standard of pollutants for municipal wastewater treatment plants. However, for the class B or class A standard, the quality of water is only equivalent to the poor class V water of surface water. The water quality is discharged into the water body environment without self-purification capacity, so that the water body is not repaired but polluted, and the phenomenon of 'treating more and more dirty' occurs. The water pollution is increasingly aggravated, and the sewage treatment plant is urgently required to carry out upgrading and reconstruction.
At present, practice is carried out continuously all over the country, the requirements on total nitrogen, total phosphorus and the like of effluent of sewage plants are higher, and the existing process is difficult to reach the full index standard actually; the prior treatment device and the prior treatment process mainly have the following problems: (1) the filtration rate of the traditional biological aerated filter ((the technical specification of the biological aerated filter CECS2652009)) is too low, and the designed filtration rate of the denitrification filter is too low to fully exert the due capacity of the denitrification filter; denitrifying bubbles are not easy to release, too much suspended matters are trapped due to low filtering speed, the pressure of the filter tank rises quickly, so that the activity of a biological membrane is not high, and the treatment efficiency is low; (2) traditionally, front-section fibrous substances of an upflow biological filter or PAC or PAM (polyaluminium chloride) remained in a pretreatment process are adhered to the surfaces of filter gaps of biological filter heads, biological membranes adhered to the surfaces block the filter gaps, forced backwashing of the filter heads is difficult to wash and remove, and then the filter heads are blocked, and finally the filter heads are paralyzed; (3) the biological filter can run off during backwashing and most of the filter material can be run off along with water flow; (4) the filter material layer of the traditional denitrification filter is higher and is generally 3.0-4.0 m, and the water loss is larger at high filter speed; (5) the backwashing strength, particularly the air washing strength, of the traditional biological aerated filter is insufficient, and the backwashing water quantity and the wastewater discharge quantity are obviously low, so that the tank pressure of the biological denitrifying filter is gradually increased after backwashing, which indicates that the backwashing of the filter is not thorough; (6) air bubbles generated by denitrification are wrapped on the surface of the filter material, so that the exchange rate of pollutants in the sewage in the biological membrane medium is seriously hindered, the resistance of the filter material is increased, and the treatment effect of the filter tank is greatly reduced. Therefore, a new technical solution needs to be developed to solve the above problems.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to solve the above-mentioned problem, provide a sewage treatment system in high filtration rate denitrogenation biological filter to break through the difficult problem that meets at present. The specific contents are as follows:
a sewage treatment system of a denitrification biological filter with an ultrahigh filtration speed is characterized in that the denitrification biological filter system with the ultrahigh filtration speed is formed by sequentially connecting an inner water inlet pore plate grid, the denitrification biological filter with the ultrahigh filtration speed and a clean water tank in series; the clean water tank is connected with the ultra-high filtration speed denitrification biological filter through a back washing water system; the aperture of the internal water inlet pore plate grid is not more than 1 mm; the ultra-high filtration speed denitrification biological filter is composed of a water distribution area, a bearing layer, a low-layer high-efficiency filter material reaction layer, a clear water area, a particle eliminating grid, a backwashing drainage channel and a water outlet channel from bottom to top in sequence, wherein a high-water-flow uniformly-distributed anti-clogging filter head and a filter plate are arranged in the water distribution area, and the bearing layer and the high-efficiency filter material reaction layer are arranged on the filter head; the thickness of the short-layer high-efficiency filter material layer is 1.5-2.5 m, and the diameter of the high-efficiency filter material layer is 4-6 mm; the ultra-high filtration speed denitrification biological filter also comprises a water level reducing system and a back washing gas system, wherein an organic carbon source dosing system is arranged at the front section water inlet of the ultra-high filtration speed denitrification biological filter
The ultra-high filtration speed denitrification biological filter is provided with an organic carbon source dosing system.
The grain-eliminating grid of the ultra-high filtration speed denitrification biological filter is made of PVC plates or stainless steel plates and is formed by arranging two groups of parallel staggered grids, the transverse distance between the grain-eliminating grid and a group of unidirectional PVC plates or stainless steel plates parallel to the water outlet channel is 3-8 mm, the front-back distance is 5-10 mm, and the grain-eliminating grid is arranged right above the slope of the filter.
The utility model solves the problem of filter tank blockage caused by water inflow of fibrous materials, adopts the core thought method of thin-layer high-efficiency active biological membrane with high filtration rate, short-layer high-efficiency filter material layer and high shear ratio, combines the method for preventing excessive suspended matters from blocking the high-efficiency filter material layer, utilizes forced backwashing to increase the medium exchange rate, ensures the high-efficiency stable operation of the ultra-high filtration rate denitrification biological filter tank, and solves the problem that the high-efficiency filter material runs off due to backwashing; by utilizing high-filtration-speed operation, denitrification bubbles are brought out quickly, and the processing load is increased. The utility model discloses can carry out the degree of depth to the sewage that contains high nitrate and inorganic phosphate and carry out the standard lifting, high filtration rate denitrogenation biological filter does to combine other function biological filters to carry out the combination technology and handles, carries the standard lifting to sewage and has very big popularization and application and worth.
Drawings
FIG. 1 is a schematic structural diagram of a sewage treatment system of a denitrification biological filter with an ultra-high filtration rate.
Wherein: feeding water 0; an internal water inlet pore plate grid 1; the biological filter comprises an ultrahigh-filtration-speed denitrification biological filter 2, a water distribution area 2-1, a support layer 2-4, a high-efficiency filter material reaction layer 2-5, a clear water area 2-6, a water outlet channel 2-7, a back-flushing fan 2-8, a back-flushing water system 2-9 and an organic carbon source dosing system 2-10; the system comprises a dense medium loading high-efficiency flocculation clarification tank 3, a dense medium adding system 3-1, a coagulant adding system 3-2, a flocculant adding system 3-3, a mixing unit 3-4 (a mixing and stirring system 3-4-1), a flocculation unit 3-5 (a guide cylinder 3-5-1 and a flocculation and stirring system 3-5-2), a clarification unit 3-6 (a mud bucket 3-6-1, a mud scraper 3-6-2, a sludge concentration zone 3-6-3, an inclined tube 3-6-4 and a clarification zone 3-6-5), a dense medium sludge reflux system 3-7, a residual sludge discharge system 3-8, a dense medium recovery system 3-9, a dense medium (magnetic seeds or sand seeds) 3-10 and stripped residual sludge 3-11; a clean water tank 4; and 5, yielding water after reaching the standard.
Detailed Description
The present invention will be further explained with reference to fig. 1:
a sewage treatment system of a denitrification biological filter with an ultrahigh filtration speed is characterized in that the denitrification biological filter with the ultrahigh filtration speed is formed by sequentially connecting an inner water inlet hole plate grid 1, a denitrification biological filter 2 with the ultrahigh filtration speed and a clean water tank 3 in series; the clean water tank 3 is connected with the ultra-high filtration speed denitrification biological filter 2 through a backwashing water system 2-11; the aperture of the internal water inlet pore plate grid 1 is not more than 1 mm; the ultra-high filtration speed denitrification biological filter 2 is composed of a water distribution area 2-1, a support layer 2-4, a low-layer high-efficiency filter material reaction layer 2-5, a clear water area 2-6, a particle eliminating grid 2-7, a backwashing drainage channel 2-8 and a water outlet channel 2-9 from bottom to top in sequence, wherein a high-water-flow uniformly-distributed anti-clogging filter head 2-2 and a filter plate 2-3 are arranged in the water distribution area 2-1, and the support layer 2-4 and the high-efficiency filter material reaction layer 2-5 are arranged on the filter plate 2-3; the thickness of the short-layer high-efficiency filter material layer 2-5 is 1.5-2.5 m, and the diameter of the high-efficiency filter material layer 2-5 is 4-6 mm; the ultra-high filtration speed denitrification biological filter 2 also comprises a water level lowering system 2-12 and a back flushing air system 2-10, and an organic carbon source dosing system 2-13 is arranged at the front section water inlet of the ultra-high filtration speed denitrification biological filter 2; the processing method comprises the following steps:
(1) pretreatment to remove fibrous and foreign matters: the sewage 0 containing nitrate firstly intercepts all fibrous materials and impurities through an inner water inlet pore plate grid 1 to prevent the fibrous materials from being adhered to gaps of an anti-blocking filter head 2-2 uniformly distributed in high-water flow, prevent a biological film and impurities from accumulating to block the filter head 2-2, and the treated effluent enters an ultra-high filtration speed denitrification biological filter 2;
(2) high filtration rate denitrification reaction: mixing the pretreated sewage containing nitrate with a carbon source added by an organic carbon source adding system 2-13, sequentially entering a water distribution area 2-1, a filter plate 2-3, an anti-blocking filter head 2-2 uniformly distributed over water, a support layer 2-4, a short layer high-efficiency filter material 2-5 reaction layer, a clear water area 2-6, a particle eliminating grid 2-7 and a water outlet channel 2-9, performing denitrification treatment, and discharging the sewage into a clear water tank 3 through the water outlet channel 2-9 (the outlet of a backwashing drainage channel 2-8 is closed); a large amount of obligate denitrification biofilms grow on the surfaces of high-efficiency filter materials 2-5 in the ultra-high filtration speed denitrification biofilter 2, the obligate denitrification biofilms utilize organic matters as denitrification carbon sources to carry out denitrification, the filtration speed of the ultra-high filtration speed denitrification biofilter 2 is 15-35 m/h and is far higher than the filtration speed of the national design standard (CECS 2652009), the denitrification biofilms are always in the thinner high-efficiency active biofilms by utilizing the cutting action of water flow, and meanwhile, the denitrification bubbles coated on the surfaces of the high-efficiency filter materials are quickly taken out of the biofilter layers by utilizing high-speed cocurrent water flow, so that the medium exchange surface area and the medium exchange rate of the biofilters and pollutants in water are increased, and the denitrification load of the high-efficiency biofilter layers is far superior to the filter treatment load of the traditional filtration speed; meanwhile, the conditions of flushing a short-layer high-efficiency filter material layer 2-5 (1.5-2.5 m) and a high filtering speed (15-35 m/h) are facilitated, so that part of intercepted suspended matters penetrate through a high-efficiency filter material layer 2-5 (effluent SS is 10-20 mg/L), the filter material layer 2-5 is prevented from being blocked by excessive suspended matters, and the denitrification load of the ultra-high filtering speed denitrification biological filter is 2-4 times that of a denitrification filter with the traditional filtering speed; fast scouring with high filtering speed acts on gaps of the anti-clogging filter heads 2-2 uniformly distributed with high water passing rate, and the anti-clogging filter heads 2-2 uniformly distributed with high water passing rate are prevented from being blocked due to biofilm growth of the filter heads;
(3) backwashing: the biological membrane in the filter 2 is aged and then back-washed by adopting a water-level-reduction and high-strength gas-water combined method, the back-washing period is 12-16 h, and the gas-washing strength is 26-30L/m2S, washing strength 8-10L/m2S; firstly, opening a valve of a water level lowering system 2-12, leading the water level in the filter tank 2 to reach the surface of a reaction layer of a short layer of high-efficiency filter material 2-5, and washing away the filter head in a reverse direction by backwashing, so as to wash away the biological membrane and other magazines on the surface of the filter head; then starting a backwashing gas system 2-10 to perform gas washing for 8-15 min (including independent gas washing time of 5-8 min), and loosening the high-efficiency filter material layer under the action of high-strength gas washing; after the independent air washing is finished, opening an air-water combined washing system (2-10, 2-11), wherein the air-water combined backwashing time is 5-8 min, water in a clean water tank 3 is used as a backwashing water source, and the high-efficiency filter material interlayer aged biological membrane is washed away through forced air-water combined backwashing; finally, carrying out single water rinsing, wherein the water rinsing is carried out for 3 to 5 times of circulation, so as to ensure that the filter can run at high load and high filtration speed consistently; during backwashing, the outlet of the water outlet channel 2-8 is closed, the backwashing drainage channel 2-9 is opened, the discharged backwashing water 5 is discharged, and the discharged water is subjected to energy dissipation and interception action of the particle dissipation grid 2-7 before being discharged, so that the high-efficiency filter material 2-5 is prevented from overflowing and losing along with air water in the backwashing process.
The ultra-high filtration speed denitrification biological filter 2 is provided with an organic carbon source dosing system 2-13.
The agents added by the organic carbon source adding system 2-13 are preferably methanol and sodium acetate.
The grain-eliminating grids 2-7 of the ultra-high filtration speed denitrification biological filter 2 are made of PVC plates or stainless steel plates and are formed by two groups of parallel staggered arrangement, the transverse distance between one group of unidirectional PVC plates or stainless steel plates parallel to the water outlet channel is 3-8 mm, the front-back distance is 5-10 mm, and the grain-eliminating grids 2-7 are arranged right above the slope of the filter.
Example 1:
the treatment flow of a sewage treatment plant in Jiangsu province is 100000m3And d, the prokaryotic core process is an oxidation ditch and secondary sedimentation tank process, and the pollutant indexes before the secondary treatment effluent enters the process are as follows: TN is 13mg/L, and the effluent quality index after the process treatment is as follows: TN is 3.5 mg/L.
Example 2:
the treatment flow of a certain municipal sewage treatment plant in Anhui province is 60000m3The original main process is 'AAO + secondary sedimentation tank' process, and the pollutant indexes before the secondary treatment effluent enters the process are as follows: TN is 18 mg/L; after the treatment of the process device, the effluent quality indexes are as follows: TN is 6 mg/L.
Example 3:
the treatment flow of the sewage treatment plant in certain chemical industry park of Nanjing of Jiangsu province is 40000m3The original main process is 'hydrolysis acidification + AAO + secondary sedimentation tank + ozone', and the pollutant indexes before the secondary treatment effluent enters the process are as follows: TN is 65 mg/L; after the treatment of the process device, the effluent quality indexes are as follows: TN is 10 mg/L.
The utility model solves the problem of filter tank blockage caused by water inflow of fibrous materials, adopts the core thought method of thin-layer high-efficiency active biological membrane with high filtration rate, short-layer high-efficiency filter material layer and high shear ratio, combines the method for preventing excessive suspended matters from blocking the high-efficiency filter material layer, utilizes forced backwashing to increase the medium exchange rate, ensures the high-efficiency stable operation of the ultra-high filtration rate denitrification biological filter tank, and solves the problem that the high-efficiency filter material runs off due to backwashing; by utilizing high-filtration-speed operation, denitrification bubbles are brought out quickly, and the processing load is increased. The utility model discloses can carry out the degree of depth to the sewage that contains high nitrate and inorganic phosphate and carry out the standard lifting, high filtration rate denitrogenation biological filter does to combine other function biological filters to carry out the combination technology and handles, carries the standard lifting to sewage and has very big popularization and application and worth.
The above-mentioned embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (3)
1. A sewage treatment system of a denitrification biological filter with an ultrahigh filtration speed is characterized in that the denitrification biological filter system with the ultrahigh filtration speed is formed by sequentially connecting an inner water inlet pore plate grid, the denitrification biological filter with the ultrahigh filtration speed and a clean water tank in series; the clean water tank is connected with the ultra-high filtration speed denitrification biological filter through a back washing water system; the aperture of the internal water inlet pore plate grid is not more than 1 mm; the ultra-high filtration speed denitrification biological filter is composed of a water distribution area, a bearing layer, a low-layer high-efficiency filter material reaction layer, a clear water area, a particle eliminating grid, a backwashing drainage channel and a water outlet channel from bottom to top in sequence, wherein a high-water-flow uniformly-distributed anti-clogging filter head and a filter plate are arranged in the water distribution area, and the bearing layer and the high-efficiency filter material reaction layer are arranged on the filter head; the thickness of the short-layer high-efficiency filter material layer is 1.5-2.5 m, and the diameter of the high-efficiency filter material layer is 4-6 mm; the ultra-high filtration speed denitrification biological filter also comprises a water level reducing system and a back washing gas system, and an organic carbon source dosing system is arranged at the front section water inlet of the ultra-high filtration speed denitrification biological filter.
2. The sewage treatment system of the ultra-high filtration rate denitrification biological filter according to claim 1, wherein: the ultra-high filtration speed denitrification biological filter is provided with an organic carbon source dosing system.
3. The sewage treatment system of the ultra-high filtration rate denitrification biological filter according to claim 1, wherein: the grain-eliminating grid of the ultra-high filtration speed denitrification biological filter is made of PVC plates or stainless steel plates and is formed by arranging two groups of parallel staggered grids, the transverse distance between the grain-eliminating grid and a group of unidirectional PVC plates or stainless steel plates parallel to the water outlet channel is 3-8 mm, the front-back distance is 5-10 mm, and the grain-eliminating grid is arranged right above the slope of the filter.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114804508A (en) * | 2022-03-21 | 2022-07-29 | 山西清泽源环保科技发展有限公司 | Autotrophic denitrification filter tank sewage treatment equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114804508A (en) * | 2022-03-21 | 2022-07-29 | 山西清泽源环保科技发展有限公司 | Autotrophic denitrification filter tank sewage treatment equipment |
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