CN111170590A - Ultra-high-filtration-speed IV-class upgrading modified nitrogen and phosphorus removal device and treatment process thereof - Google Patents
Ultra-high-filtration-speed IV-class upgrading modified nitrogen and phosphorus removal device and treatment process thereof Download PDFInfo
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- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- 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
Abstract
The invention discloses a nitrogen and phosphorus removal device transformed by IV-class water extraction standard with ultrahigh filtration speed and a treatment process thereof, wherein the device is formed by sequentially connecting an inner water inlet pore plate grid, a denitrification biological filter with ultrahigh filtration speed, a dense medium loading high-efficiency flocculation clarification tank with ultrahigh filtration speed and a clean water tank in series; by adopting the method, the problem that the filter head of the traditional aerobic nitrification biological filter is easy to block due to fibrous impurities is solved; the problems of blockage, low filtration speed and high treatment load and low treatment load of the upflow denitrification biological filter are solved, and the treatment effect of the dense medium loading high-efficiency flocculation clarification tank is obviously superior to that of the traditional combined treatment device and process; the invention solves the problem of the traditional process of high-efficiency denitrification and dephosphorization, can carry out deep scaling on the sewage containing high nitrate and inorganic phosphate, can lead the effluent to reach the IV-class water standard, and has great popularization and application values for scaling the sewage.
Description
Technical Field
The invention belongs to the technical field of water pollution treatment, and particularly relates to an IV-class upgrading modified nitrogen and phosphorus removal device with an ultrahigh filtration rate and a treatment process thereof.
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 effluent of a sewage treatment plant is urgently required to reach the IV-class standard of the surface class.
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 IV-class water process is difficult to reach the full index standard practically; the prior treatment device and the prior treatment process mainly have the following problems: (1) the filtering speed of the traditional biological aerated filter ((the technical specification of the biological aerated filter CECS2652009)) is too low, so that the activity of a biological membrane is not high, the treatment efficiency is low, and the designed filtering speed of the denitrification filter is too low, so that the due capacity of the denitrification filter cannot be fully exerted; 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; (ii) a (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 SS of the effluent of the traditional biological filter matched process is difficult to reach below 5 mg/L; (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) 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; (6) the traditional chemical dephosphorization coagulating sedimentation tank has too low surface load, easily causes the problem of filter head blockage of the filter tank, and occupies larger area. 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 IV-class water process is difficult to actually meet the IV-class water effluent index requirements. Therefore, a new technical solution needs to be developed to solve the above problems.
Disclosure of Invention
The invention aims to solve the problems and provides an IV-class upgrading modified nitrogen and phosphorus removal device with an ultrahigh filtration rate and a treatment process thereof so as to break through the problems encountered at present. The specific contents are as follows: a ultra-high filtration speed IV-class water extraction standard transformation nitrogen and phosphorus removal device is formed by sequentially connecting an inner water inlet pore plate grid, an ultra-high filtration speed nitrogen removal biological filter, an ultra-high filtration speed dense medium loading high-efficiency flocculation clarification tank and a clean water tank in series; the clean water tank is connected with the ultra-high filtration speed denitrification biological filter through a backwashing water system, and the ultra-high filtration speed denitrification biological filter is provided with an organic carbon source dosing system; the heavy medium loading high-efficiency flocculation clarification tank comprises a heavy medium feeding system, a coagulant feeding system, a flocculant feeding system, a mixing unit, a flocculation unit, a clarification unit, a heavy medium sludge backflow system, a residual sludge discharge system and a heavy medium recovery system; the mixing unit is provided with a mixing and stirring system; the flocculation unit is provided with a guide cylinder and a flocculation stirring system; the clarification unit is provided with a mud bucket, a mud scraper, a sludge concentration area, an inclined pipe and a clarification area.
The aperture of the internal water inlet pore plate grid is not more than 1 mm.
The ultra-high-filtration-speed IV-class water standard-modified nitrogen and phosphorus removal device sequentially comprises a water distribution area, a supporting layer, a high-efficiency filter material reaction layer, a clear water area and a water outlet channel from bottom to top, wherein a high-water-flow uniformly-distributed anti-blocking filter head and a filter plate are arranged in the water distribution area, and the supporting layer and the high-efficiency filter material reaction layer are arranged on the filter head.
The ultra-high filtration speed dense medium loading high-efficiency flocculation clarification tank is a magnetic coagulation sedimentation tank or a sand loading high-efficiency sedimentation tank.
The sludge return system is respectively connected with a sludge hopper at the lower part of the clarification unit and a guide cylinder of the flocculation unit.
The heavy medium adding system is a magnetic seed adding system or a sand seed adding system.
The agent correspondingly added by the dense medium recovery system is a magnetic seed or a sand seed.
The thickness of a high-efficiency filter material layer of the ultra-high-filtration-speed denitrification biological filter is 1.5-2.5 m, and the diameter of the high-efficiency filter material is 3-10 mm.
The agent added by the organic carbon source dosing system is preferably methanol or sodium acetate.
The treatment steps of the sewage treatment process for modifying the nitrogen and phosphorus removal device by the IV-class water standard with the ultrahigh filtration speed mainly comprise:
(1) removing fibrous impurities: the secondary biochemical effluent firstly intercepts all fibrous materials and impurities through an inner water inlet pore plate grid to prevent the fibrous materials from causing the blockage of a long handle filter head at the bottom of a subsequent ultra-high filtration speed denitrification biological filter, and the treated effluent enters the ultra-high filtration speed denitrification biological filter;
(2) deep denitrification: a large amount of special denitrification biological films grow on the surfaces of high-efficiency filter materials in the ultra-high filtration speed denitrification biological filter, the special denitrification biological films utilize organic matters as denitrification carbon sources to carry out deep denitrification, the filtration speed of the ultra-high filtration speed denitrification biological filter is 12-35 m/h and is higher than the domestic design standard (engineering specification CECS2652009) of the aeration biological filter, the denitrification biological films are always in the thinner high-efficiency active biological films by utilizing the cutting action of water flow, and the high-filtration speed quick scouring acts on the high-water uniform distribution anti-clogging filter head gaps to prevent the filter heads from being blocked by the growth biological films of the filter heads; ensuring that the denitrification load of the high-efficiency biological filter material layer is far superior to the filter treatment load of the conventional filter speed; simultaneously, denitrifying bubbles coated on the surface of the high-efficiency filter material are quickly brought out of the biological filter material layer by utilizing high-speed same-direction water flow; meanwhile, the method is beneficial to the conditions of a high-efficiency filter material layer (1.5-2.5 m) with lower height and high-filtering-speed scouring, so that the intercepted partial suspended matters penetrate through the high-efficiency filter material layer (the effluent SS is 10-20 mg/L), the denitrification load of the high-efficiency biological filter material layer is far superior to the filter treatment load of the conventional filtering speed, the filter material layer is prevented from being blocked by excessive suspended matters, the treatment load of the ultra-high-filtering-speed denitrification biological filter 2 is 2-4 times of that of the denitrification filter of the conventional filtering speed, the backwashing period is 12-16 h, the backwashing is carried out by adopting a water-lowering level and gas-water combined method, and the effluent treated by the ultra-high-filtering-speed denitrification biological filter 2 automatically flows into the ultra-high-filtering-speed dense medium loading high-efficiency;
(3) deep phosphorus removal and suspended matter removal: the effluent of the ultra-high filtration speed denitrification biological filter is firstly treated by an ultra-high filtration speed dense medium loading high-efficiency flocculation clarification tank to remove suspended matters (SS is less than 5mg/L) and TP (TP is less than 0.3 mg/L); the effluent of the ultra-high filtration speed denitrification biological filter is subjected to mixing reaction in a mixing unit, and is subjected to flocculation reaction with heavy medium sludge reflowing in a flocculation unit, so that sludge-water separation is realized in a clarification unit, the surface load is 15-40 m/h, which is 1.0-1.5 m/h higher than that of a common coagulating sedimentation tank, and the clarified effluent is treated as effluent reaching the standard after being disinfected conventionally; partially refluxing the precipitated heavy medium sludge through a heavy medium sludge refluxing system, wherein the sludge refluxing ratio is 1.5-6%; after the heavy medium and the sludge are stripped by the heavy medium sludge partially precipitated through the residual sludge discharge system and the heavy medium recovery system, the recovered heavy medium enters the mixing unit, and the stripped sludge is discharged as residual sludge.
The invention solves the problem that the filter head of the traditional aerobic nitrification biological filter is easy to block due to fibrous impurities; the problems of blockage and high treatment load and low load of the upflow denitrification biological filter are solved, and the treatment effect of the dense medium loading high-efficiency flocculation clarification tank is obviously superior to that of the traditional combined treatment device and process; the denitrification bubble is brought out quickly by utilizing high-filtration-speed operation, so that the processing load is increased; the invention solves the problem of the traditional process of high-efficiency denitrification and dephosphorization, can carry out deep scaling on the sewage containing high nitrate and inorganic phosphate, can lead the effluent to reach the IV-class water standard, has high treatment filtration rate or load, and has great popularization and application value for scaling the sewage.
Drawings
FIG. 1 is a schematic structural diagram of an IV-class upgrading modified denitrification and dephosphorization apparatus with an ultrahigh filtration rate.
Wherein: feeding water 0; an internal water inlet pore plate grid 1; the biological filter comprises a super-high filtration speed denitrification biological filter 2, a water distribution area 2-1, anti-clogging filter heads 2-2 uniformly distributed with high water passing rate, filter plates 2-3, 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 flush fan 2-8, a back flush 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 invention is further illustrated with reference to figure 1:
a ultra-high filtration speed IV-class water extraction scale modified denitrification and dephosphorization device is formed by sequentially connecting an inner water inlet pore plate grid 1, an ultra-high filtration speed denitrification biological filter 2, an ultra-high filtration speed dense medium loading high-efficiency flocculation clarification tank 3 and a clean water tank 4 in series; the clean water tank 4 is connected with the ultra-high filtration speed denitrification biological filter 2 through a backwashing water system 2-9, and the ultra-high filtration speed denitrification biological filter 2 is provided with an organic carbon source dosing system 2-10; the ultra-high filtration speed dense medium loading high-efficiency flocculation clarification tank 3 comprises a dense medium feeding system 3-1, a coagulant feeding system 3-2, a flocculant feeding system 3-3, a mixing unit 3-4, a flocculation unit 3-5, a clarification unit 3-6, a dense medium sludge reflux system 3-7, an excess sludge discharge system 3-8 and a dense medium recovery system 3-9; the mixing unit 3-4 is provided with a mixing and stirring system 3-4-1; the flocculation unit 3-5 is provided with a guide cylinder 3-5-1 and a flocculation stirring system 3-5-2; the clarification unit 3-6 is provided with a mud bucket 3-6-1, a mud scraper 3-6-2, a sludge concentration area 3-6-3, an inclined pipe 3-6-4 and a clarification area 3-6-5.
The aperture of the internal water inlet pore plate grid 1 is not more than 1 mm.
The ultra-high-filtration-speed IV-class water standard-improvement denitrification and dephosphorization device sequentially comprises a water distribution area 2-1, a supporting layer 2-4, a high-efficiency filter material reaction layer 2-5, a clear water area 2-6 and a water outlet channel 2-7 from bottom to top, 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, and the supporting layer 2-4 and the high-efficiency filter material reaction layer 2-5 are arranged on the water distribution area.
The ultra-high filtration speed dense medium loading high-efficiency flocculation and clarification tank 3 is a magnetic coagulation sedimentation tank or a sand loading high-efficiency sedimentation tank.
The sludge return system 3-7 is respectively connected with a mud bucket 3-6-1 at the lower part of the clarification unit 3-6 and a guide cylinder 3-5-1 of the flocculation unit 3-5.
The heavy medium adding system 3-1 is a magnetic seed adding system or a sand seed adding system.
The medicament correspondingly added by the dense medium recovery system 3-2 is magnetic seeds or sand seeds.
The thickness of a high-efficiency filter material layer of the ultra-high-filtration-speed denitrification biological filter is 1.5-2.5 m, and the diameter of the high-efficiency filter material is 3-10 mm.
The agents added by the organic carbon source dosing system 2-10 are preferably methanol and sodium acetate.
The treatment steps of the sewage treatment process for modifying the nitrogen and phosphorus removal device by the IV-class water standard with the ultrahigh filtration speed mainly comprise:
(1) removing fibrous impurities: the secondary biochemical effluent 0 firstly intercepts all fibrous materials and impurities through an inner water inlet pore plate grid 1 to prevent the fibrous materials from causing the blockage of a filter head 2-2 at the bottom of a subsequent ultra-high filtration rate denitrification biological filter 2, and the treated effluent enters the ultra-high filtration rate denitrification biological filter 2;
(2) deep denitrification: 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 deep denitrification, the filtration speed of the ultra-high filtration speed denitrification biofilter 2 is 12-35 m/h and is higher than the domestic design standard (CECS 2652009) in the engineering technical specification of aeration biofilters, the denitrification biofilms are always in thinner high-efficiency active biofilms by utilizing the cutting action of water flow, and the rapid scouring with high filtration speed acts on 2-2 gaps of the anti-clogging filter heads uniformly distributed with high water flow, so that the filter heads can be prevented from growing biofilms to block the filter heads 2-2; ensuring that the denitrification load of the high-efficiency biological filter material layer is far superior to the filter treatment load of the conventional filter speed; rapidly bringing the denitrification bubbles wrapped on the surface of the high-efficiency filter material out of the biological filter material layer 2-5 by utilizing high-speed same-direction water flow; meanwhile, the method is beneficial to a high-efficiency filter material layer 2-5 with lower height, so that the intercepted partial suspended matters penetrate through the high-efficiency filter material layer 2-5 (the effluent SS is 10-20 mg/L), the denitrification load of the high-efficiency biological filter material layer is ensured to be far superior to the filter treatment load of the conventional filter speed, the filter material layer 2-5 is prevented from being blocked by excessive suspended matters, the treatment load of the denitrification biological filter 2 with the ultrahigh filter speed is 2-4 times of that of the denitrification filter with the conventional filter speed, the backwashing period is 12-16 h, the backwashing is carried out by adopting a water-level-reduction and air-water combination method, and the effluent treated by the denitrification biological filter 2 with the ultrahigh filter speed automatically flows into a dense medium loading high-efficiency flocculation clarification tank 3 with the ultrahigh filter speed;
(3) deep phosphorus removal and suspended matter removal: the effluent of the biological filter 2 with the ultra-high filtration speed is firstly treated by a heavy medium loading high-efficiency flocculation clarification tank 3 with the ultra-high filtration speed to remove suspended matters (SS is less than 5mg/L) and TP (TP is less than 0.3 mg/L); the effluent of the ultra-high filtration speed denitrification biological filter 2 is subjected to a mixing reaction in a mixing unit 3-4, is subjected to a flocculation reaction with heavy medium sludge reflowing in a flocculation unit 3-5, is subjected to sludge-water separation in a clarification unit 3-6, has a surface load of 15-40 m/h, is 1.0-1.5 m/h higher than that of a common coagulation sedimentation tank, and is subjected to conventional disinfection to be used as effluent reaching the standard; the precipitated heavy medium sludge is partially refluxed through a heavy medium sludge reflux system 3-7, and the sludge reflux ratio is 1.5-6%; after the heavy medium and the sludge are stripped by the heavy medium sludge partially precipitated through the residual sludge discharge system 3-8 and the heavy medium recovery system 3-9, the recovered heavy medium 3-10 enters a mixing unit, and the stripped sludge 3-11 is discharged as residual sludge.
Example 1:
the treatment flow of a certain sewage treatment plant in Jiangsu province is 150000m3/d, the prokaryotic core process is an oxidation ditch and secondary sedimentation tank process, and the indexes of pollutants before secondary treatment effluent enters the process are as follows: TN 18mg/L, SS 80mg/L, TP 3.5; after the treatment by the process, the effluent quality indexes are as follows: TN 2.5mg/L, SS 2mg/L, and TP 0.1 mg/L.
Example 2:
the treatment flow of a certain municipal sewage treatment plant in Anhui province is 50000m3/d, the original main process is 'AAO + secondary sedimentation tank' process, and the indexes of pollutants before secondary treatment effluent enters the process are as follows: TN 18mg/L, SS 30mg/L, TP 2.5; after the treatment of the process device, the effluent quality indexes are as follows: TN 2.5mg/L, SS 3mg/L, and TP 0.1 mg/L.
Example 3:
the sewage treatment plant in certain chemical industry park of Nanjing of Jiangsu province has the treatment flow of 10000m3/d, the primary 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 13mg/L, SS is 30mg/L, TP is 2.7; after the treatment of the process device, the effluent quality indexes are as follows: TN is 2.6mg/L, SS is 3mg/L, TP is 0.05mg/L, and the effluent can reach IV water standard.
The invention solves the problem that the filter head of the traditional aerobic nitrification biological filter is easy to block due to fibrous impurities; the problems of blockage of the upflow denitrification biological filter and low treatment high load are solved, and the treatment effect of the dense medium loading high-efficiency flocculation clarification tank is obviously superior to that of the traditional combined treatment device and process; the denitrification bubble is brought out quickly by utilizing high-filtration-speed operation, so that the processing load is increased; the invention solves the problem of the traditional process of high-efficiency denitrification and dephosphorization, can carry out deep standard extraction on the sewage containing high nitrate and inorganic phosphate, can lead the effluent to reach the IV-class water standard, and has great popularization and application values for sewage standard extraction.
The above-mentioned embodiments are merely illustrative of the technical ideas 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 implement the present invention, and not to 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 within the protection scope of the present invention.
Claims (10)
1. The utility model provides a nitrogen and phosphorus removal device is reformed transform to IV class water standard of super high filtration speed which characterized in that: the device is formed by sequentially connecting an inner water inlet pore plate grid, an ultrahigh filtration speed denitrification biological filter, an ultrahigh filtration speed dense medium loading high-efficiency flocculation clarification tank 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 flushing water system, and the ultra-high filtration speed denitrification biological filter is provided with an organic carbon source dosing system; the heavy medium loading high-efficiency flocculation clarification tank comprises a heavy medium feeding system, a coagulant feeding system, a flocculant feeding system, a mixing unit, a flocculation unit, a clarification unit, a heavy medium sludge backflow system, a residual sludge discharge system and a heavy medium recovery system; the mixing unit is provided with a mixing and stirring system; the flocculation unit is provided with a guide cylinder and a flocculation stirring system; the clarification unit is provided with a mud bucket, a mud scraper, a sludge concentration area, an inclined pipe and a clarification area.
2. The ultra-high filtration rate type-IV water standard transformation nitrogen and phosphorus removal device of claim 1, which is characterized in that: the aperture of the internal water inlet pore plate grid is not more than 1 mm.
3. The ultra-high filtration rate type-IV water standard transformation nitrogen and phosphorus removal device of claim 1, which is characterized in that: the ultra-high-filtration-speed IV-class water standard-modified nitrogen and phosphorus removal device sequentially comprises a water distribution area, a supporting layer, a high-efficiency filter material reaction layer, a clear water area and a water outlet channel from bottom to top, wherein a high-water-flow uniformly-distributed anti-blocking filter head and a filter plate are arranged in the water distribution area, and the supporting layer and the high-efficiency filter material reaction layer are arranged on the filter head.
4. The ultra-high filtration rate type-IV water standard transformation nitrogen and phosphorus removal device of claim 1, which is characterized in that: the ultra-high filtration speed dense medium loading high-efficiency flocculation clarification tank is a magnetic coagulation sedimentation tank or a sand loading high-efficiency sedimentation tank.
5. The ultra-high filtration rate type-IV water standard transformation nitrogen and phosphorus removal device of claim 1, which is characterized in that: the sludge return system is respectively connected with a sludge hopper at the lower part of the clarification unit and a guide cylinder of the flocculation unit.
6. The ultra-high filtration rate type-IV water standard transformation nitrogen and phosphorus removal device of claim 1, which is characterized in that: the heavy medium adding system is a magnetic seed adding system or a sand seed adding system.
7. The ultra-high filtration rate type-IV water standard transformation nitrogen and phosphorus removal device of claim 1, which is characterized in that: the dense medium recovery system is a magnetic seed recovery system or a sand seed recovery system.
8. The ultra-high filtration rate type-IV water standard transformation nitrogen and phosphorus removal device of claim 1, which is characterized in that: the thickness of a high-efficiency filter material layer of the ultra-high-filtration-speed denitrification biological filter is 1.5-2.5 m, and the diameter of the high-efficiency filter material is 3-10 mm.
9. The ultra-high filtration rate type-IV water standard transformation nitrogen and phosphorus removal device of claim 1, which is characterized in that: the agent added by the organic carbon source dosing system is preferably methanol or sodium acetate.
10. A sewage treatment process for modifying a nitrogen and phosphorus removal device by adopting the ultra-high filtration rate IV-class water standard according to any one of claims 1 to 9, which mainly comprises the following treatment steps:
(1) removing fibrous impurities: the secondary biochemical effluent firstly intercepts all fibrous materials and impurities through an inner water inlet pore plate grid to prevent the fibrous materials from causing the blockage of a long handle filter head at the bottom of a subsequent ultra-high filtration speed denitrification biological filter, and the treated effluent enters the ultra-high filtration speed denitrification biological filter;
(2) deep denitrification: a large amount of obligate denitrification biofilms grow on the surface of a high-efficiency filter material in the ultra-high filtration speed denitrification biofilter, the obligate denitrification biofilms utilize organic matters as denitrification carbon sources to carry out deep denitrification, the filtration speed of the ultra-high filtration speed denitrification biofilter is 12-35 m/h, the filtration speed is higher than the domestic design standard (engineering specification CECS2652009 of the aeration biofilter), the denitrification biofilms are always in a thinner high-efficiency active biofilm by utilizing the cutting action of water flow, and simultaneously, the denitrification bubbles coated on the surface of the high-efficiency filter material are rapidly taken out of a biofilter layer by utilizing high-speed cocurrent water flow, so that the denitrification load of the high-efficiency biofilter layer is far superior to the filter treatment load of the conventional filtration speed; fast scouring with high filtering speed acts on gaps of the anti-clogging filter heads uniformly distributed in high-water-flow, so as to prevent the filter heads from being clogged by the growing biological membranes; meanwhile, the method is beneficial to the conditions of a high-efficiency filter material layer with lower height and high-filtering-speed scouring, so that the intercepted part of suspended matters penetrate through the high-efficiency filter material layer (the effluent SS is 10-20 mg/L), the filter material layer is prevented from being blocked by excessive suspended matters, the treatment load of the ultra-high-filtering-speed denitrification biological filter is 2-4 times that of a denitrification filter with the conventional filtering speed, the backwashing period is 12-16 h, a 'water-lowering level and air-water combined method' is adopted for backwashing, and the effluent treated by the ultra-high-filtering-speed denitrification biological filter automatically flows into an ultra-high-filtering-speed dense medium loading high-efficiency flocculation tank;
(3) deep phosphorus removal and suspended matter removal: the ultra-high filtration speed denitrification biological filter removes suspended matters (SS is less than 5mg/L) and TP (TP is less than 0.3mg/L) through an ultra-high filtration speed heavy medium loading high-efficiency flocculation clarification tank; the effluent of the ultra-high filtration speed denitrification biological filter is subjected to mixing reaction in a mixing unit, and is subjected to flocculation reaction with heavy medium sludge reflowing in a flocculation unit, so that sludge-water separation is realized in a clarification unit, the surface load is 15-40 m/h, which is 1.0-1.5 m/h higher than that of a common coagulating sedimentation tank, and the clarified effluent is treated as effluent reaching the standard after being disinfected conventionally; partially refluxing the precipitated heavy medium sludge through a heavy medium sludge refluxing system, wherein the sludge refluxing ratio is 1.5-6%; after the heavy medium and the sludge are stripped by the heavy medium sludge partially precipitated through the residual sludge discharge system and the heavy medium recovery system, the recovered heavy medium enters the mixing unit, and the stripped sludge is discharged as residual sludge.
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| CN112390464A (en) * | 2020-11-05 | 2021-02-23 | 深圳市金锋环境有限公司 | Combined process of magnetic coagulation clarification tank and BAF (biological aerated Filter) with water outlet index reaching surface water IV |
| CN112390463A (en) * | 2020-11-05 | 2021-02-23 | 深圳市金锋环境有限公司 | Combined process for effluent COD, BOD5 and NH3-N, TP indexes reaching surface water IV |
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