CN106673194A - Decarburization, denitrification and dephosphorization deep treatment system and method - Google Patents
Decarburization, denitrification and dephosphorization deep treatment system and method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000005261 decarburization Methods 0.000 title abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 63
- 238000004062 sedimentation Methods 0.000 claims abstract description 26
- 239000000463 material Substances 0.000 claims description 54
- 238000005273 aeration Methods 0.000 claims description 38
- 230000001546 nitrifying effect Effects 0.000 claims description 30
- 238000003763 carbonization Methods 0.000 claims description 28
- 239000007788 liquid Substances 0.000 claims description 25
- 229910052760 oxygen Inorganic materials 0.000 claims description 19
- 239000001301 oxygen Substances 0.000 claims description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 18
- 238000011001 backwashing Methods 0.000 claims description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 15
- 239000002351 wastewater Substances 0.000 claims description 15
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 14
- 229910052698 phosphorus Inorganic materials 0.000 claims description 14
- 239000011574 phosphorus Substances 0.000 claims description 14
- 238000010992 reflux Methods 0.000 claims description 13
- 229910002651 NO3 Inorganic materials 0.000 claims description 12
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 12
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 11
- 239000000945 filler Substances 0.000 claims description 11
- 238000005262 decarbonization Methods 0.000 claims description 9
- 238000011049 filling Methods 0.000 claims description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 238000012856 packing Methods 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 238000011010 flushing procedure Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 6
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 230000015556 catabolic process Effects 0.000 claims description 5
- 238000006731 degradation reaction Methods 0.000 claims description 5
- 241000894006 Bacteria Species 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 229920002521 macromolecule Polymers 0.000 claims description 3
- 230000001590 oxidative effect Effects 0.000 claims description 3
- 239000013589 supplement Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 6
- 239000011259 mixed solution Substances 0.000 abstract description 4
- 230000001360 synchronised effect Effects 0.000 abstract description 2
- 230000002452 interceptive effect Effects 0.000 abstract 1
- 238000000638 solvent extraction Methods 0.000 abstract 1
- 239000010865 sewage Substances 0.000 description 17
- 238000004065 wastewater treatment Methods 0.000 description 6
- 239000003344 environmental pollutant Substances 0.000 description 5
- 231100000719 pollutant Toxicity 0.000 description 5
- 239000012528 membrane Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005189 flocculation Methods 0.000 description 2
- 239000010841 municipal wastewater Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 238000003911 water pollution Methods 0.000 description 2
- 241000195628 Chlorophyta Species 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000009287 sand filtration Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009279 wet oxidation reaction Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/308—Biological phosphorus removal
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- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
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- 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 discloses a decarburization, denitrification and dephosphorization deep treatment system. The decarburization, denitrification and dephosphorization deep treatment system comprises an anaerobic biological filter, a denitrification biological filter, a carburization biological filter and a nitrification biological filter which are connected in sequence, wherein the anaerobic biological filter is provided with a water inlet pipe; the nitrification biological filter is provided with a water outlet pipe. The carburization biological filter is connected to the anaerobic biological filter through a first mixed solution reflowing pipe in a returning manner; the nitrification biological filter is connected to the anaerobic biological filter through a second mixed solution reflowing pipe in the returning manner; the nitrification biological filter is connected to the denitrification biological filter through a nitrification mixed solution reflowing pipe in the returning manner; the water inlet pipe of the anaerobic biological filter is connected to the denitrification biological filter through overstepping the water inlet pipe; the denitrification biological filter is provided with a primary sedimentation output water leading-in pipe connected with output water of a primary sedimentation tank. The system and the method disclosed by the invention are multi-combination, synchronous and interactive type decarburization, denitrification and dephosphorization deep treatment system and method, which have the advantages of high anti-impact load, high partitioning function, high treatment capability, short process flow, small occupied area and good treatment effect.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to a decarbonization, denitrification and dephosphorization advanced treatment system and method suitable for advanced wastewater treatment.
Background
With the acceleration of the urbanization process of China, the population number of cities is increased rapidly, the existing sewage treatment scale and the effluent quality can not meet the requirements of urban construction, the water pollution is serious day by day, the eutrophication of water bodies is caused by the excessive discharge of nitrogen and phosphorus, and the health and the safety of human beings are seriously influenced by the growing green algae in rivers and lakes.
According to the discharge Standard of pollutants for municipal wastewater treatment plants (GB18918-2002) (Table 1-2), when rivers and lakes with smaller dilution capability are introduced into effluent of a wastewater treatment plant for use as municipal landscape water and general reuse water, the first-grade A standard is required to be implemented.
For urban sewage treatment plants, the discharge standard reaches the first-level discharge standard in the discharge Standard of pollutants for urban sewage treatment plants (GB18918-2002), and the main difficulty is to ensure the standard discharge of nitrogen and phosphorus. As municipal sewage treatment plants generally have larger treatment scale and the cost of chemical nitrogen and phosphorus removal is higher, the chemical nitrogen and phosphorus removal is usually only used as an auxiliary means. Under the situation, the selection of the advanced treatment process which can stably reach the primary standard is a key problem for upgrading and modifying newly-built sewage treatment plants and old sewage treatment plants. The advanced treatment of the sewage can reduce the sewage discharge, reduce the water pollution, further develop the sewage, realize the sewage reclamation and the reclaimed water reuse, and has great strategic significance for ensuring the safe water supply of cities and the sustainable utilization of environmental resources.
At present, the common advanced treatment process for urban sewage treatment in China mainly comprises the following steps: a flocculation precipitation method, a sand filtration method, an activated carbon method, an ozone oxidation method, a membrane separation method, an ion exchange method, an electrolysis treatment, a wet oxidation method, an evaporation concentration method, an advanced oxidation method, and other physical and chemical methods, and a biological denitrification and dephosphorization method.
The physical and chemical advanced treatment method is expensive and complex to manage. The coagulation-clarification-filtration method has large water yield per unit area, strong adaptability and stable treatment effect, but can not ensure NH3-N effluent requirement. The micro-flocculation filtration method has simple treatment process and higher requirement on the quality of the inlet water,
the biofilter treatment process makes great breakthrough in the aspects of organic pollutant removal, nitrification and ammonia removal, denitrification and denitrification, aerobic-anoxic alternative phosphorus removal, pretreatment of micro-polluted source water and the like, the combined process technology is also mature in application, good treatment effect is obtained, researches on the inner structure, reaction mechanism and reaction kinetics of a biological membrane of the biological aerated filter are gradually carried out, the biological aerated filter has obvious effect on removing organic matters, suspended matters and ammonia nitrogen, and the biological aerated filter is a water treatment technology suitable for the national conditions of China.
Therefore, how to provide a combined treatment process for a biological filter tank in a targeted manner is a problem to be solved for advanced treatment of sewage.
Disclosure of Invention
Based on the problems in the prior art, the invention aims to provide a system and a method for advanced treatment of decarburization, denitrification and dephosphorization, which are suitable for advanced wastewater treatment, improve the quality of effluent water, enable the effluent water to meet the first-class A standard or the VI water body standard of pollutant discharge standard of urban sewage treatment plants, and solve the problems of heavy wastewater proportion, poor biochemical property and the like in the existing advanced treatment process.
The purpose of the invention is realized by the following technical scheme:
the embodiment of the invention provides a decarbonization, denitrification and dephosphorization advanced treatment system, which comprises:
an anaerobic biofilter, a denitrification biofilter, a carbonization biofilter and a nitrification biofilter which are connected in sequence; wherein,
the anaerobic biological filter is provided with a water inlet pipe;
the nitrifying biological filter is provided with a water outlet pipe;
the carbonized biological filter is connected back to the anaerobic biological filter through a first mixed liquid return pipe;
the nitrifying biological filter is connected to the anaerobic biological filter through a second mixed liquid return pipe;
the nitrifying biological filter is connected to the denitrifying biological filter through a nitrifying mixed liquid return pipe;
the water inlet pipe of the anaerobic biological filter is connected to the denitrification biological filter through a surpassing water inlet pipe;
the denitrification biological filter is provided with a primary sedimentation water inlet pipe connected with the primary sedimentation tank outlet water.
The embodiment of the invention also provides a decarburization and denitrification dephosphorization advanced treatment method, and the advanced treatment system comprises the following steps:
step 1, introducing the effluent of a secondary sedimentation tank into an anaerobic biological filter of the system, intercepting organic matters in the effluent of the secondary sedimentation tank, converting organic matters which are difficult to degrade and have macromolecules into organic matters which are easy to degrade and have micromolecules, improving the biochemical property of wastewater, and forming phosphorus accumulating bacteria, so that the effluent meets the aerobic phosphorus absorption requirement of a subsequent carbonization and nitrification biological filter;
step 2, enabling effluent of the anaerobic biofilter to automatically flow into a denitrification biofilter, introducing reflux nitrification liquid of the nitrification biofilter into the denitrification biofilter, wherein the reflux ratio of the nitrification liquid is 50-200%, micro-oxygen is filled in the denitrification biofilter in an aeration mode, DO is less than 0.5mg/L, so that a functional area of the denitrification biofilter is in an anoxic state, and nitrate substances in the reflux nitrification liquid are reduced into nitrogen; the denitrification biological filter supplements carbon sources by introducing the effluent of a secondary sedimentation tank and the effluent of a primary sedimentation tank;
step 3, the effluent of the denitrification biological filter enters a carbonization biological filter, is matched with the set homogeneous ceramsite filter material packing layer through an aeration device, and is subjected to effective biochemical degradation by changing the aeration quantity of the aeration device to adjust the dissolved oxygen of the carbonization biological filter and degrade organic matters in the influent water, so that the organic matters in the effluent are reduced;
and 4, enabling the effluent of the carbonized biofilter to enter a nitrifying biofilter, controlling the amount of aeration dissolved oxygen to be 2-4 mg/l under the action of an aeration device and a homogeneous ceramsite filter material packing layer, converting ammonia nitrogen and nitrate in the wastewater into nitrate and nitrite, removing organic matters and ammonia nitrogen in the wastewater, and discharging the treated water reaching the standard through a water outlet pipe of the nitrifying biofilter.
According to the technical scheme provided by the invention, the advanced treatment system provided by the embodiment of the invention can realize the decarbonization, denitrification and dephosphorization treatment by arranging the anaerobic biofilter, the denitrification biofilter, the carbonization biofilter and the nitrification biofilter which are organically connected, and has the advantages of high impact load resistance, strong partition function, strong treatment capability, short process flow, small occupied area and good treatment effect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic view of a system for advanced treatment of decarbonization, denitrification, and dephosphorization provided by an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the specific contents of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a system for advanced treatment of decarbonization, denitrification, and dephosphorization, comprising:
an anaerobic biological filter 1, a denitrification biological filter 2, a carbonization biological filter 3 and a nitrification biological filter 4 which are connected in sequence; wherein,
the anaerobic biological filter is provided with a water inlet pipe A;
the nitrifying biological filter is provided with a water outlet pipe B;
the carbonized biological filter 3 is connected back to the anaerobic biological filter 1 through a first mixed liquid return pipe 5;
the nitrifying biological filter 3 is connected to the anaerobic biological filter 1 through a second mixed liquid return pipe 6;
the nitrifying biological filter 3 is connected to the denitrifying biological filter 2 through a nitrifying mixed liquid return pipe 9;
the water inlet pipe A of the anaerobic biological filter 1 is connected to the denitrification biological filter 2 through a surpassing water inlet pipe 7;
the denitrification biological filter 2 is provided with a primary sedimentation water inlet pipe 8 connected with the primary sedimentation tank outlet water.
In the advanced treatment system, a filter material is arranged in the anaerobic biological filter 1, the average porosity inside and outside the filter material is 40 percent, and the CODcr volume load of the anaerobic biological filter 1 is 2-8 kgCODcr/(m)3·d)。
In the advanced treatment system, the filter material in the anaerobic biological filter tank is volcanic biological filter material.
In the advanced treatment system, a filter material is arranged in the denitrification biological filter, and the specific surface area of the filter material is 40000cm2(g) the filter material has an intraparticle porosity of
An aeration device is arranged below the filtering material in the filtering tank, and DO in the denitrification biological filtering tank is less than 0.5 mg/L.
Among the above-mentioned advanced treatment system, be equipped with the cobble that 0.3m is thick as the supporting layer in the carbonization biological filter, be equipped with homogeneity haydite filter material packing layer on the supporting layer, homogeneity haydite filter material packing layer is by the haydite filter material packing of particle diameter 3 ~ 5mm and 4 ~ 6mm according to 1: 1, and the specific surface area of the ceramsite filter material filler is 40000cm2(g) the porosity in the ceramsite filter filler is
An aeration device is arranged at the bottom end of the bearing layer;
the CODcr volume load of the carbonization biological filter is 1-4 kgCODcr/(m)3·d)。
In the advanced treatment system, an aeration device is arranged in the nitrifying biological filter, the aeration dissolved oxygen is controlled to be 2-4 mg/l,
the nitrifying biological filter is internally provided with pebbles with the thickness of 0.3m as a bearing layer, the bearing layer is provided with a homogeneous ceramsite filter material filling layer, and the homogeneous ceramsite filter material filling layer is formed by filling ceramsite filter materials with the particle sizes of 3-5mm and 4-6 mm according to the weight ratio of 1: 1, and the specific surface area of the ceramsite filter material filler is 40000cm2(g) the porosity in the ceramsite filter filler is
The backwashing period of the nitrifying biological filter is 24 hours, the air-water combined flushing is adopted, and the backwashing air strength is 12L/m2S backwash water intensity of 6L/m2.s。
In the advanced treatment system, the reflux ratio of the nitrifying liquid in the mixed liquid of the nitrifying biological filter to the denitrifying biological filter is 50-200%.
The depth processing system further comprises: and the air-water combined backwashing device is respectively connected with the denitrification biological filter, the carbonization biological filter and the nitrification biological filter and is used for periodically carrying out air-water combined backwashing on the denitrification biological filter, the carbonization biological filter and the nitrification biological filter.
The embodiment of the invention also provides a decarburization and denitrification dephosphorization advanced treatment method, which adopts the advanced treatment system and comprises the following steps:
step 1, introducing the effluent of a secondary sedimentation tank into an anaerobic biological filter of the system, intercepting organic matters in the effluent of the secondary sedimentation tank, converting organic matters which are difficult to degrade and have macromolecules into organic matters which are easy to degrade and have micromolecules, improving the biochemical property of wastewater, and forming phosphorus accumulating bacteria, so that the effluent meets the aerobic phosphorus absorption requirement of a subsequent carbonization and nitrification biological filter;
step 2, enabling effluent of the anaerobic biofilter to automatically flow into a denitrification biofilter, introducing reflux nitrification liquid of the nitrification biofilter into the denitrification biofilter, wherein the reflux ratio of the nitrification liquid is 50-200%, micro-oxygen is filled in the denitrification biofilter in an aeration mode, DO is less than 0.5mg/L, so that a functional area of the denitrification biofilter is in an anoxic state, and nitrate substances in the reflux nitrification liquid are reduced into nitrogen; the denitrification biological filter supplements carbon sources by introducing the effluent of a secondary sedimentation tank and the effluent of a primary sedimentation tank;
step 3, the effluent of the denitrification biological filter enters a carbonization biological filter, is matched with the set homogeneous ceramsite filter material packing layer through an aeration device, and is subjected to effective biochemical degradation by changing the aeration quantity of the aeration device to adjust the dissolved oxygen of the carbonization biological filter and degrade organic matters in the influent water, so that the organic matters in the effluent are reduced;
and 4, enabling the effluent of the carbonized biofilter to enter a nitrifying biofilter, controlling the amount of aeration dissolved oxygen to be 2-4 mg/l under the action of an aeration device and a homogeneous ceramsite filter material packing layer, oxidizing ammonia nitrogen and nitrate in the wastewater into nitrate and nitrite, removing organic matters and ammonia nitrogen in the wastewater, and discharging the treated water reaching the standard through a water outlet pipe of the nitrifying biofilter.
The depth processing method further comprises the following steps: the backwashing of the denitrification biological filter, the carbonization biological filter and the nitrification biological filter is carried out by adopting air-water combined flushing, the backwashing period is 24 hours, and the strength of backwashing air of the air-water combined flushing is 10-15L/m2S, the strength of the backwashing water is 6-8L/m2.s。
The specific process of the advanced treatment system for treating wastewater comprises the following steps:
step 1) introducing the effluent of the secondary sedimentation tank into an anaerobic biological filter, wherein the anaerobic biological filter is provided with a filter material, the average porosity of the inside and the outside of the filter material is about 40 percent, the thickness of a biological membrane on a filler with a large specific surface area is about 1-3 mm, the volume load of CODcr is generally 2-8 kgCODcr/(m3 d), the impact load resistance is strong, organic matters in the effluent of the secondary sedimentation tank are intercepted, organic matters which are difficult to degrade and large in molecules are converted into organic matters which are easy to degrade and small in molecules, the biochemical property of the wastewater is improved, and phosphorus accumulating bacteria are formed, so that powerful support is provided for aerobic phosphorus absorption of a subsequent carbonization and nitrification biological filter.
Step 2) the effluent of the anaerobic biofilter automatically flows to a denitrification biofilter, the mixed solution of the nitrification biofilter flows back to the denitrification biofilter, the aeration mode is adopted to fill micro oxygen, DO is less than 0.5mg/L, so that the functional area of the nitrification biofilter is in an anoxic state, the reflux ratio of the nitrification solution is 50-200%, and meanwhile, the specific surface area/40000 cm2/g and the intra-granular porosity of the filter material are the sameThe bottom end is provided with an aeration device which reduces nitrate substances in the returned nitrified liquid into nitrogenAnd (4) qi. In order to make up for the shortage of carbon source, part of the wastewater is led to the denitrification biological filter from the effluent of the secondary sedimentation tank and the effluent of the primary sedimentation tank, and the carbon source is supplemented. Where the remaining nitrates are reduced to nitrogen while consuming the waste water organics.
And 3) discharging water from the denitrification biological filter to a carbonization biological filter, wherein COD (chemical oxygen demand) in sewage is mainly reduced in the denitrification biological filter, 0.3m pebbles are filled in the aeration biological filter to serve as a supporting layer, and the pebbles with the particle sizes of 3-5mm and 4-6 mm are mixed for 1: 1, the specific surface area/40000 cm2/g of the filter material and the porosity in the particlesThe bottom end is provided with an aeration device, dissolved oxygen in the biological aerated filter is adjusted by changing aeration quantity, a large amount of organic matters in the effluent of the secondary sedimentation tank are degraded, effective biochemical degradation is carried out, the organic matters in the effluent are reduced, and oxygen required by the biological degradation is provided by an air blower.
And 4) enabling the effluent to enter a nitrification biological filter, arranging an aeration device and a filter material in the nitrification biological filter, wherein the filter material is the same as the filter material in the carbonization biological filter, controlling 2-4 mg/l of aeration dissolved oxygen, mainly nitrifying the ammonia nitrogen into nitrate and nitrite, mainly oxidizing the residual ammonia nitrogen in the wastewater into nitrite or nitrate, and further removing organic matters and ammonia nitrogen. Reducing ammonia nitrogen in the effluent, and discharging the effluent after reaching the standard.
Step 5) the denitrification, carbonization and nitrification biofilters can be partitioned, synchronized and interactively decarbonized, denitrified and dephosphorized, anaerobic, anoxic and aerobic states are integrally formed, and the integral denitrification, carbonization and nitrification systems are formed by nitrifying liquid backflow, mixed liquid backflow and surpass the direct denitrification system; the filler is arranged in each subarea, anaerobic, anoxic and aerobic states are formed among the filter material layers, and reinforced functional units are arranged among the three functional areas, but three states which can be mutually interacted exist, so that the three functional areas are supplemented and reinforced, and the removal of pollutants is facilitated; after the filter tank is operated for a period, because the head loss is increased, the filter tank needs to be backwashed to remove the intercepted suspended matters and renew the biological membrane so as to keep good removalRemoving rate, wherein backwashing is carried out by adopting air-water combined flushing, and the strength of backwashing air is 10-15L/m2S, strength of backwash water is 6-8L/m2S. The process has the characteristics of high impact load resistance, strong partition function, strong processing capacity, short process flow, small occupied area and good processing effect.
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
In the embodiment, the advanced treatment system (see figure 1) and the method are adopted to carry out advanced treatment on the municipal sewage, and the characteristics of the sewage quality are shown in a table 1.
(1) Firstly, after the sewage is subjected to secondary treatment, the effluent of the secondary sedimentation tank enters an anaerobic biological filter, a volcanic biological filter material is arranged in the anaerobic biological filter, and the biological filter material has the common specification: 3-5mm, the average porosity inside and outside is about 40%, and the CODcr volume load is generally 2-4 kgCODcr/(m3 d);
(2) the effluent of the anaerobic biofilter automatically flows to a denitrification biofilter, the mixed liquor of the nitrification biofilter flows back to the denitrification biofilter with the reflux ratio of 100-200%, the aeration mode is adopted to fill micro-oxygen, DO is less than 0.5mg/L, so that the functional area of the filter material is in an anoxic state, and meanwhile, the specific surface area/40000 cm2/g and the intra-granular porosity of the filter material are the sameThe bottom end is provided with an aeration device;
(3) discharging water from the denitrification biological filter to a carbonization biological filter aeration biological filter, and filling pebbles of 0.3m serving as a bearing layer, wherein the particle size of the pebbles is 3-5mm and 4-6 mm, and mixing the pebbles by 1: 1, the specific surface area/40000 cm2/g of the filter material and the porosity in the particlesThe bottom end is provided with an aeration device, and the CODcr volume load is generally1～4kgCODcr/(m3·d)；
(4) The effluent enters a nitrification biofilter, an aeration device and a filter material are arranged in the nitrification biofilter, the filter material is the same as the filter material in the carbonization biofilter, 2-4 mg/L of dissolved oxygen is aerated, the nitrification biofilter is aerated for biodegradation, the concentration of the dissolved oxygen is controlled to be 3-4 mg/L, the backwashing period of the nitrification biofilter is 24 hours, the nitrification biofilter is washed by air water jointly, and the strength of backwashing air is 12L/m2S, backwash water intensity 6L/m2.s；
In the method, the effluent quality of the nitrifying biofilter treated in the step 4 can reach the primary A standard of discharge Standard of pollutants for municipal wastewater treatment plant, namely BOD5≤10mg/l，CODcr≤50mg/l，SS≤10mg/l，NH3-N≤5mg/l，T-P≤0.5mg/l，T-N≤15mg/l。
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. The utility model provides a decarbonization nitrogen and phosphorus removal advanced treatment system which characterized in that includes:
an anaerobic biofilter, a denitrification biofilter, a carbonization biofilter and a nitrification biofilter which are connected in sequence; wherein,
the anaerobic biological filter is provided with a water inlet pipe;
the nitrifying biological filter is provided with a water outlet pipe;
the carbonized biological filter is connected back to the anaerobic biological filter through a first mixed liquid return pipe;
the nitrifying biological filter is connected to the anaerobic biological filter through a second mixed liquid return pipe;
the nitrifying biological filter is connected to the denitrifying biological filter through a nitrifying mixed liquid return pipe;
the water inlet pipe of the anaerobic biological filter is connected to the denitrification biological filter through a surpassing water inlet pipe;
the denitrification biological filter is provided with a primary sedimentation water inlet pipe connected with the primary sedimentation tank outlet water.
2. The system of claim 1, wherein the anaerobic biological filter is provided with a filter material, the average porosity of the filter material inside and outside is 40%, and the CODcr volume load of the anaerobic biological filter is 2-8 kgCODcr/(m)3·d)。
3. The system of claim 2, wherein the filter material in the anaerobic biological filter is volcanic biological filter material.
4. The system of claim 1 or 2, wherein a filter material is arranged in the denitrification biological filter, and the specific surface area of the filter material is 40000cm2(g) the filter material has an intraparticle porosity of
An aeration device is arranged below the filtering material in the filtering tank, and DO in the denitrification biological filtering tank is less than 0.5 mg/L.
5. The system of claim 1 or 2, wherein pebbles with a thickness of 0.3m are arranged in the carbonization biological filter and serve as a supporting layer, a homogeneous ceramsite filter material filling layer is arranged on the supporting layer, and the homogeneous ceramsite filter material filling layer is prepared by mixing ceramsite filter materials with particle sizes of 3-5mm and 4-6 mm according to the weight ratio of 1: 1 ofThe weight ratio of the ceramsite filter material filler to the filler is 40000cm2(g) the porosity in the ceramsite filter filler is
An aeration device is arranged at the bottom end of the bearing layer;
the CODcr volume load of the carbonization biological filter is 1-4 kgCODcr/(m)3·d)。
6. The system of claim 1 or 2, wherein an aeration device is arranged in the nitrification biological filter, aeration dissolved oxygen is controlled to be 2-4 mg/l,
the nitrifying biological filter is internally provided with pebbles with the thickness of 0.3m as a bearing layer, the bearing layer is provided with a homogeneous ceramsite filter material filling layer, and the homogeneous ceramsite filter material filling layer is formed by filling ceramsite filter materials with the particle sizes of 3-5mm and 4-6 mm according to the weight ratio of 1: 1, and the specific surface area of the ceramsite filter material filler is 40000cm2(g) the porosity in the ceramsite filter filler is
The backwashing period of the nitrifying biological filter is 24 hours, the air-water combined flushing is adopted, and the backwashing air strength is 12L/m2S backwash water intensity of 6L/m2.s。
7. The system of claim 1 or 2, wherein the reflux ratio of nitrifying liquid from the mixed liquid in the nitrifying biological filter to the denitrifying biological filter is 50-200%.
8. A decarbonization, denitrification and dephosphorization advanced treatment method is characterized in that the advanced treatment system of any one of claims 1 to 7 is adopted, and the method comprises the following steps:
step 1, introducing the effluent of a secondary sedimentation tank into an anaerobic biological filter of the system, intercepting organic matters in the effluent of the secondary sedimentation tank, converting organic matters which are difficult to degrade and have macromolecules into organic matters which are easy to degrade and have micromolecules, improving the biochemical property of wastewater, and forming phosphorus accumulating bacteria, so that the effluent meets the aerobic phosphorus absorption requirement of a subsequent carbonization and nitrification biological filter;
step 2, enabling effluent of the anaerobic biofilter to automatically flow into a denitrification biofilter, introducing reflux nitrification liquid of the nitrification biofilter into the denitrification biofilter, wherein the reflux ratio of the nitrification liquid is 50-200%, micro-oxygen is filled in the denitrification biofilter in an aeration mode, DO is less than 0.5mg/L, so that a functional area of the denitrification biofilter is in an anoxic state, and nitrate substances in the reflux nitrification liquid are reduced into nitrogen; the denitrification biological filter supplements carbon sources by introducing the effluent of a secondary sedimentation tank and the effluent of a primary sedimentation tank;
step 3, the effluent of the denitrification biological filter enters a carbonization biological filter, is matched with the set homogeneous ceramsite filter material packing layer through an aeration device, and is subjected to effective biochemical degradation by changing the aeration quantity of the aeration device to adjust the dissolved oxygen of the carbonization biological filter and degrade organic matters in the influent water, so that the organic matters in the effluent are reduced;
and 4, enabling the effluent of the carbonized biofilter to enter a nitrifying biofilter, controlling the amount of aeration dissolved oxygen to be 2-4 mg/l under the action of an aeration device and a homogeneous ceramsite filter material packing layer, oxidizing ammonia nitrogen and nitrate in the wastewater into nitrate and nitrite, removing organic matters and ammonia nitrogen in the wastewater, and discharging the treated water reaching the standard through a water outlet pipe of the nitrifying biofilter.
9. The advanced treatment method for decarbonization, denitrification and dephosphorization as claimed in claim 8, further comprising:
the backwashing of the denitrification biological filter, the carbonization biological filter and the nitrification biological filter is carried out by adopting air-water combined flushing, the backwashing period is 24 hours, and the strength of backwashing air of the air-water combined flushing is 10-15L/m2S, the strength of the backwashing water is 6-8L/m2.s。
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