CN110407410B - Wastewater treatment device and method based on biomembrane particle sludge reactor - Google Patents
Wastewater treatment device and method based on biomembrane particle sludge reactor Download PDFInfo
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Classifications
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
-
- 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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- 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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
-
- 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
Abstract
The invention discloses a wastewater treatment device and a method based on a biomembrane particle sludge reactor, wherein the device comprises the following components: the system comprises a grid pond, a grit chamber, an adjusting pond water pump, a first pipeline mixer, a second pipeline mixer, a coagulating sedimentation pond, a first intermediate pond and a sequencing batch biofilm granule sludge expanded bed reactor; the outlet of the grid pond is connected with the inlet of the grit chamber, the outlet of the grit chamber is connected with the inlet of the regulating pond, the outlet of the regulating pond is connected with a first pipeline mixer through a water pump of the regulating pond, the first pipeline mixer is mixed with coagulant and is connected with a second pipeline mixer, the second pipeline mixer is mixed with flocculant and is connected with the inlet of a coagulating sedimentation pond, the outlet of the coagulating sedimentation pond is connected with the inlet of a first intermediate pond, and the outlet of the first intermediate pond is connected with a sequencing batch biological membrane granule sludge expansion bed reactor. The invention forms a secondary biological treatment unit of wastewater, improves the efficiency of biological treatment of wastewater, has low operation cost and compact structure, and reduces the occupied area.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a wastewater treatment device and method based on a biomembrane particle sludge reactor.
Background
In order to avoid serious harm to human health and ecological environment caused by industrial wastewater pollution and improve the life and ecological environment of people, the industrial wastewater is treated and detected to reach the standard before being discharged. Currently, the main methods for industrial wastewater treatment include a physical method, a chemical method, a physical and chemical method, a biological method and the like, and the existing wastewater biological treatment method has the following general disadvantages: the process flow is complex, and larger occupied area and higher capital investment are needed; the microorganism concentration is low, and the sludge is easy to expand; poor adaptability to the change of water quality and water quantity; the oxygen transfer efficiency is low, and the power consumption is high; the operation is difficult to maintain and manage; the real-time on-line automatic control degree is low, and the energy consumption is high. How to better solve the problems existing in the traditional wastewater treatment process and improve the energy efficiency of the biological treatment process is the key point and trend of the wastewater treatment technology research.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention provides the wastewater treatment device and the method based on the biomembrane particle sludge reactor, which improve the efficiency of wastewater biological treatment and reduce the treatment cost.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention provides a wastewater treatment device based on a biomembrane particle sludge reactor, which comprises: the system comprises a grid pond, a grit chamber, an adjusting pond water pump, a first pipeline mixer, a second pipeline mixer, a coagulating sedimentation pond, a first intermediate pond and a sequencing batch biofilm granule sludge expanded bed reactor;
the grid pond export is connected with the grit chamber entry, grit chamber export and equalizing basin entry linkage, the equalizing basin export is connected with first pipeline blender through the equalizing basin water pump, first pipeline blender mixes the coagulant to be connected with the second pipeline blender, the second pipeline blender mixes the flocculant, and with coagulating sedimentation pond entry linkage, coagulating sedimentation pond export and first intermediate pool entry linkage, first intermediate pool export is connected with sequencing batch biofilm granule sludge expansion bed reactor.
As the preferable technical scheme, the anaerobic reactor is further provided with an anaerobic reactor inlet and a second middle water tank, the anaerobic reactor inlet is connected with the first middle water tank outlet, the anaerobic reactor outlet is connected with the second middle water tank inlet, and the second middle water tank outlet is connected with the sequencing batch biofilm granule sludge expanded bed reactor.
As a preferable technical scheme, the sequencing batch biofilm granule sludge expanded bed reactor is provided with: the biological carrier bed comprises a water inlet, a supporting plate, a biological carrier bed, a limiting plate, a water distribution system, an air distribution system, a water distributor, an aeration system, a first blower, a second blower, a first water inlet pump and a circulating water outlet;
The water inlet is connected with the water outlet of the second water inlet pump, the biological carrier bed is arranged on the supporting plate and is provided with biological carriers, the biological carriers are distributed irregularly, an expansion space is formed between the biological carrier bed and the limiting plate, the air distribution system is connected with the second air blower, the water distributor is arranged on the supporting plate, the aeration system is connected with the first air blower, the circulating water outlet is connected with the water inlet of the first water inlet pump, and the water distribution system is connected with the water outlet of the first water inlet pump.
As the preferable technical scheme, the sequencing batch biofilm granule sludge reactor is also provided with a circulating aeration tank and a water outlet tank, the water outlet tank is provided with a circulating reflux port, the circulating reflux port is connected with the circulating aeration tank, the aeration system is arranged in the circulating aeration tank, and the circulating water outlet is arranged on the circulating aeration tank.
As a preferred embodiment, the volume of the expansion space is set to 1/50-1/20 of the volume of the bio-carrier bed 9.
As the preferable technical scheme, the inner ring of the biological carrier is provided with granular sludge, the outer ring is provided with a biological film, and the inner ring is internally provided with a separation strip.
As a preferred technical solution, the biological carrier adopts hollow particle filler with density less than 1g/cm 3, specific surface area more than 500m 2/m3 and porosity between 60% and 85%.
As the preferable technical scheme, the supporting plate adopts a porous plate, water distributors are uniformly distributed on the through holes of the supporting plate, and wastewater is uniformly distributed along the vertical section of the water flow after passing through the water distributors and passes through the biomembrane particle sludge reaction zone.
As the preferable technical scheme, the limiting plate adopts a porous plate, wastewater enters the circulating reflux area from the biomembrane granule sludge reaction area through the through holes on the limiting plate, and the size of the through holes on the limiting plate is smaller than that of the biological carrier.
The invention also provides a wastewater treatment method based on the biomembrane particle sludge reactor, which comprises the following steps:
S1: pretreatment: removing impurities from the production wastewater through a grid pond and a grit chamber, and then entering an adjusting pond to perform balanced adjustment of water quality and water quantity;
S2: and (3) coagulating sedimentation treatment: adding a coagulant when the pretreated wastewater passes through a first pipeline mixer, adding a flocculant when the pretreated wastewater passes through a second pipeline mixer, mixing, entering a coagulating sedimentation tank for coagulation reaction, generating mud-water separation in the coagulating sedimentation tank after coagulation reaction, and extracting supernatant fluid to enter a first intermediate water tank;
s3: adding nutritive salt into the first intermediate water tank, regulating the pH value by using alkali liquor and acid solution, and enabling wastewater to enter a biomembrane particle sludge reactor for biochemical oxidation treatment:
S31: the wastewater in the first intermediate water tank enters the circulating aeration tank, a first water inlet pump is started at the same time, the wastewater in the circulating aeration tank is conveyed to a water distribution system through the first water inlet pump, and enters the biomembrane particle sludge reactor, and when the biomembrane particle sludge reactor is full of wastewater and the wastewater in the circulating aeration tank reaches a set water level, water inlet is stopped;
s32: after water inflow is completed, a first air blower is started, wastewater in a circulating aeration tank is aerated through an aeration system, the wastewater in the circulating aeration tank is conveyed to a water distribution and air distribution area of a biological membrane particle sludge reactor, then the wastewater enters a biological carrier bed for biochemical oxidation treatment, and then enters a circulating reflux area, and the wastewater in the circulating reflux area enters the circulating aeration tank through a circulating reflux port; in the wastewater treatment process, wastewater in the cyclic aeration tank sequentially passes through a water and air distribution area, a biological membrane particle sludge reaction area and a cyclic reflux area of the biological membrane particle sludge reactor to carry out cyclic treatment on the wastewater;
S33: in the circulation treatment of the wastewater, stopping supplying air to the circulation aeration tank for a period of time, and performing the circulation treatment of the wastewater in an anoxic state; after circulation treatment is carried out for a period of time, the operation of the first water inlet pump and the first air blower is stopped, a certain proportion of wastewater is discharged out of the reactor through the water outlet, and the step S31 is executed in a return mode;
S4: and back flushing the biological carrier through a second air blower and an air distribution system, discharging the back flushed waste water out of the reactor through a back flushing water outlet, conveying the waste water to an adjusting tank, and carrying out coagulating sedimentation treatment together with the pretreated waste water.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) The sequencing batch biofilm granule sludge expanded bed reactor can independently form a wastewater secondary biological treatment unit, and can also be combined with an anaerobic reactor to form the secondary biological treatment unit, so that the sequencing batch biofilm granule sludge expanded bed reactor is efficient and flexible, the efficiency of wastewater biological treatment is integrally improved, and the occupied area is reduced.
(2) The biological membrane granular sludge reactor has high sludge concentration, the biological carrier bed sludge concentration (TSS) reaches 20-45g/L, which is higher than the sludge concentration of the active sludge method and the biological membrane method commonly used at present, the sewage treatment is ensured to obtain good effect, the sludge yield is low, the residual sludge yield is less than 0.15kgTSS/kgCOD, and the residual sludge yield is more than 60% lower than that of the active sludge method.
(3) The inner ring of the biological carrier is provided with the granular sludge, the outer ring of the biological carrier is provided with the biological film, the formation of the granular sludge is a main reason that the reactor has high sludge concentration, and the high-concentration granular sludge and the biological film in the reactor ensure good wastewater treatment effect.
(4) The aeration system for biological treatment is arranged in the independent circulating aeration tank, so that the problem that the aeration system is easy to block commonly existing in the biological treatment system is solved, the aeration system is convenient to maintain, and meanwhile, the circulating aeration tank has the functions of diluting and balancing water quality, thereby being beneficial to improving the wastewater treatment efficiency.
(5) The biological membrane particle sludge reactor is simple, compact, efficient, flexible and high in adaptability, suspended matters in the wastewater are adsorbed and intercepted by microorganisms after the wastewater passes through the biological carrier bed and then decomposed and degraded, so that the suspended matters are low in concentration after the wastewater is treated by the biological membrane particle sludge reactor, the water outlet quality is stable, and a secondary sedimentation tank is not needed.
(6) The sequencing batch biofilm granule sludge expanded bed reactor is provided with the expansion space, so that the biological carriers in the biological carrier bed are in a micro-expansion state in the wastewater treatment process, the uniform distribution of wastewater in a biofilm granule sludge reaction zone is facilitated, the wastewater is uniformly treated, and the wastewater treatment efficiency is effectively improved.
Drawings
FIG. 1 is a schematic diagram showing the structure of a wastewater treatment apparatus based on a biofilm granule sludge reactor in this example 1;
FIG. 2 is an enlarged view of a portion of the bio-carrier bed at I in FIG. 1;
FIG. 3 is a schematic view of the structure of the biological carrier in example 1;
FIG. 4 is a schematic view showing the construction of a wastewater treatment apparatus based on a biofilm granule sludge reactor in this example 2;
Fig. 5 is a schematic structural view of the biofilm granule sludge reactor of the present example 3.
The device comprises a 1-biomembrane particle sludge reactor, a 2-circulation aeration tank, a 3-first water inlet pump, a 4-water distribution system, a 5-supporting plate, a 6-water distributor, a 7-biological carrier bed, an 8-expansion space, a 9-limiting plate, a 10-water outlet tank, a 11-second water inlet pump, a 12-first air blower, a 13-aeration system, a 14-second air blower, a 15-gas distribution system, a 16-water outlet, a 17-grid tank, a 18-grit chamber, a 19-regulating tank, a 20-first pipeline mixer, a 21-second pipeline mixer, a 22-coagulation sedimentation tank, a 23-first intermediate water tank, a 24-third water pump, a 25-anaerobic reactor, a 26-second intermediate water tank, 27-particle sludge, a 28-biomembrane and a 29-regulating tank water pump.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
As shown in fig. 1, the present embodiment provides a wastewater treatment apparatus based on a biofilm granule sludge reactor, comprising: the method comprises the steps of removing coarse impurities from wastewater through a grille pond 17, a grit chamber 18, a regulating pond 19, a regulating pond water pump 29, a first pipeline mixer 20, a second pipeline mixer 21, a coagulating sedimentation pond 22, a first intermediate water pond 23 and a biological membrane particle sludge reactor 1, removing heavy impurities through the grille pond 17, then entering the grit chamber 18, entering the regulating pond 19, carrying out balanced regulation of water quality and water quantity, adding a coagulant when passing through the first pipeline mixer 20, adding a flocculating agent when passing through the second pipeline mixer 21, carrying out coagulation reaction in the coagulating sedimentation pond, separating mud from water in the coagulating sedimentation pond after a period of coagulation reaction, enabling supernatant to enter the first intermediate water pond 23, supplementing nutrient salt, regulating the pH value with alkali liquor and an acid solution, then enabling the wastewater to enter a sequencing batch biological membrane particle sludge expanded bed reactor through a second water inlet pump 11, and simultaneously starting a first water inlet pump 3, and carrying out biochemical oxidation circulation treatment on the wastewater in the biological membrane particle sludge reactor 1.
In the embodiment, a water and gas distribution area A, a biological film particle sludge reaction area B and a circulating reflux area C are arranged in the biological film particle sludge reactor 1 along the wastewater treatment direction; the water distribution and gas distribution area A is provided with a water distribution system 4, a gas distribution system 15 and a water distributor 6 arranged on a supporting plate 5, and the gas distribution system 15 is connected with a second blower 14 through a pipeline; the biological membrane granular sludge reaction zone B comprises a supporting plate 5, a biological carrier bed 7 arranged on the supporting plate 5, a limiting plate 9 and an expansion space 8 formed between the biological carrier bed 7 and the limiting plate 9; the circulating reflux zone C is provided with a water outlet tank 10, the water outlet tank 10 is provided with a circulating reflux port, and the circulating reflux port is connected with the circulating aeration tank 2 through a pipeline;
In the embodiment, the supporting plate 5 adopts a porous plate, and the through holes of the supporting plate 5 are provided with water distributors 6, so that wastewater is uniformly distributed along the vertical section of water flow and passes through the biomembrane particle sludge reaction zone; the limiting plate 9 is a porous plate, waste water enters the circulating reflux zone from the biological membrane particle sludge reaction zone through the through holes in the limiting plate 9, and the size of the through holes in the limiting plate 9 is smaller than that of biological carriers in the biological membrane particle sludge reaction zone;
in the embodiment, the circulating aeration tank 2 is provided with an aeration system 13 and a circulating water outlet, the aeration system is connected with a first blower 12 through a pipeline, the circulating water outlet is connected with a water inlet of a first water inlet pump 3 through a pipeline, and a water outlet of the first water inlet pump 3 is connected with a water distribution system 4;
In the embodiment, a back flushing water outlet is also arranged on the biomembrane particle sludge reactor 1; the circulating aeration tank 2 is also provided with a water inlet and a water outlet 16;
In this embodiment, the minimum volume of the expansion space 8 is 0, and the maximum volume of the expansion space 8 is 1/10 of the volume of the bio-carrier bed 7; the volume of the expansion space 8 of the present embodiment is preferably set to 1/50-1/20 of the volume of the bio-carrier bed 7;
In this embodiment, the flow rate of the wastewater through the bio-carrier bed 7 is maintained such that the bio-carrier in the bio-carrier bed 7 is in a micro-expanded state, the bio-carrier expansion fills the entire space including the bio-carrier bed 7 and the expansion space 8, preferably at a flow rate of 1.5-15mm/s, and the bio-carrier employs a hollow particulate filler having a density of less than 1g/cm 3, a specific surface area of more than 500m 2/m3, and a porosity of between 60% and 85%.
As shown in fig. 2, the biological carrier is in a micro-expansion state in the wastewater treatment process and is irregularly distributed in the biological membrane granular sludge reaction zone B; as shown in fig. 3, the inner ring of the biological carrier is provided with granular sludge 27, the outer ring is provided with a biological film 28, the inner ring is provided with a separation strip, the reactor simultaneously forms granular sludge and the biological film, and the granular sludge and the biological film simultaneously have aerobic, facultative and anaerobic microbial communities; after the reactor sludge domestication is completed, granular sludge is generated in the biological carrier, and a biological film is formed on the surface of the carrier, wherein the formation of the granular sludge is a main reason that the reactor has high sludge concentration, and the high-concentration granular sludge and the biological film in the reactor ensure good wastewater treatment effect.
The specific wastewater treatment steps in this example are as follows:
s1: pretreatment: the production wastewater passes through a grid pond 17 to remove coarse impurities, then enters a sand setting pond 18 to remove heavy impurities, and then enters an adjusting pond 19 to perform balanced adjustment of water quality and water quantity;
S2: and (3) coagulating sedimentation treatment: the pretreated wastewater passes through a first pipeline mixer 20 and a second pipeline mixer 21, 400mg/L polyaluminium chloride (PAC) and 6mg/L Cationic Polyacrylamide (CPAM) are sequentially added, the PAC and the CPAM in the wastewater are uniformly mixed by stirring, the wastewater enters a coagulating sedimentation tank 22 for coagulation reaction, the wastewater after the reaction generates mud-water separation in the coagulating sedimentation tank 22, the supernatant fluid is extracted and enters a first intermediate water tank 23, and the sludge precipitated at the bottom of the coagulating sedimentation tank is dehydrated and dried and then transported outwards for further harmless, stabilizing and recycling treatment;
S3: the waste water is supplemented with nutrient salts and the like required by biological treatment in a first intermediate water tank 23, the pH value is regulated by alkali liquor and acid solution, and the waste water enters a biomembrane particle sludge reactor 1 for biochemical oxidation treatment:
1) Inflow of water
The wastewater in the first intermediate water tank 23 enters the cyclic aeration tank 2 from a water inlet through the second water inlet pump 11, the first water inlet pump 3 is started at the same time, the wastewater in the cyclic aeration tank 2 is conveyed to the water distribution system 4 through the first water inlet pump 3 through a cyclic water outlet, and enters the biological membrane particle sludge reactor 1, and when the biological membrane particle sludge reactor 1 is full of wastewater and the wastewater in the cyclic aeration tank 2 reaches a certain water level, the water inlet is stopped;
In the embodiment, the wastewater adopts papermaking coating wastewater, COD of the wastewater is 3250mg/L, chromaticity is 2700C.U., and SS is 280mg/L;
2) Treatment and recycling of waste water
After water inflow is completed, a first air blower 12 is started to aerate the wastewater in the circulating aeration tank 2 through an aeration system 13;
The wastewater in the circulating aeration tank 2 is conveyed to a water distribution system 4 of a water distribution and air distribution area A of the biomembrane particle sludge reactor 1 through a circulating water outlet and a first water inlet pump 3, enters the water distribution and air distribution area A, the wastewater in the water distribution and air distribution area A enters a biomembrane particle sludge reactor 1 through a water distributor 6 on a supporting plate 5, and enters a biomembrane carrier bed 7 of the biomembrane particle sludge reactor 1, and the wastewater is subjected to biochemical oxidation treatment in the biomembrane carrier bed 7 and then enters a circulating reflux area C through a limiting plate 9;
the wastewater in the circulating reflux zone C enters the circulating aeration tank 2 through a circulating reflux port arranged in the water outlet tank 10 and a pipeline, and the wastewater in the circulating aeration tank 2 sequentially passes through the water distribution and air distribution zone A, the biological membrane particle sludge reaction zone B and the circulating reflux zone C of the biological membrane particle sludge reactor 1 again through the first water inlet pump 3 to treat and circulate the wastewater;
The volume of the expansion space 8 of the biological membrane particle sludge reactor 1 is 1/20 of the volume of the biological carrier bed 7, the flow rate of the wastewater in the biological membrane particle sludge reactor 1 is 15mm/s, the wastewater treatment period is 8 hours, the aeration operation time is 5 hours, the anoxic operation time is 1 hour, and the dissolved oxygen concentration of the biological membrane particle sludge reaction zone B is 4-5mg/L during the aeration operation;
3) Drainage water
In the wastewater treatment process, the first air blower 12 is stopped to supply air to the cyclic aeration tank 2 for a period of time, so that wastewater is treated and circulated in an anoxic state, after the wastewater is treated for a period of time, the first water inlet pump 3 and the first air blower 12 are stopped to operate, 30% of the total amount of wastewater in the biomembrane granule sludge reactor 1 and the cyclic aeration tank 2 is discharged out of the reactor through the water outlet 16, COD of the treated wastewater is 115mg/L, chromaticity is 25C.U., and SS is 28mg/L.
After the wastewater is treated for a period of time, the biological carrier can be backwashed through the second air blower 14 and the air distribution system 15, the backwashed wastewater is discharged out of the reactor through a backwashed water outlet and is conveyed to the regulating tank 19, and coagulation sedimentation treatment is carried out together with the pretreated wastewater.
In this embodiment, by changing parameters such as PAC addition, CPAM addition, volume of expansion space of the biofilm granule sludge reactor, flow rate of wastewater in the biofilm granule sludge reactor, aeration operation time, and anoxic operation time, different wastewater treatment effects can be obtained, which are specifically described as follows:
The PAC addition amount is 200mg/L, the CPAM addition amount is 4mg/L, the volume of an expansion space of the biological membrane particle sludge reactor is 1/50 of the volume of a biological carrier bed, the flow rate of the wastewater in the biological carrier bed is 1.5mm/s, one treatment period of the wastewater is 8h, the aeration operation time is 4h, the anoxic operation time is 2h, the dissolved oxygen concentration of a biological membrane particle sludge reaction zone B in the aeration operation is 4-5mg/L, the COD of the treated wastewater is 205mg/L, the chromaticity is 78C.U., and the SS is 34mg/L;
The PAC addition amount is 300mg/L, the CPAM addition amount is 5mg/L, the volume of an expansion space of the biological membrane particle sludge reactor is 1/40 of the volume of a biological carrier bed, the flow rate of the wastewater in the biological carrier bed is 8mm/s, one treatment period of the wastewater is 8h, the aeration operation time is 5h, the anoxic operation time is 1h, the dissolved oxygen concentration of a biological membrane particle sludge reaction zone B in the aeration operation is 4-5mg/L, the COD of the treated wastewater is 124mg/L, the chromaticity is 43C.U., and the SS is 36mg/L;
The wastewater adopted in the embodiment is secondary fiber papermaking wastewater, COD of the wastewater is 4590+/-80 mg/L, chromaticity is 1070+/-50 C.U., and SS is 160+/-15 mg/L; the volume of the expansion space is set to be 1/40 of the volume of the biological carrier bed 7, the flow rate of the wastewater in the biological carrier bed is 7mm/s, one treatment period of the wastewater is 8 hours, the aeration operation time is 3 hours, the anoxic operation time is 3 hours, the dissolved oxygen concentration of the biological membrane particle sludge reaction zone B is 4-5mg/L, the COD of the treated wastewater is 220+/-40 mg/L, the chromaticity is 25+/-5 C.U., and the SS is 10+/-4 mg/L.
Example 2
The technical scheme of this embodiment 2 is the same as that of embodiment 1 except for the following technical features:
As shown in fig. 4, the present embodiment provides a wastewater treatment apparatus based on a biofilm granule sludge reactor, comprising: the method comprises the steps of removing coarse impurities from wastewater through a grid tank 17, a grit chamber 18, a regulating tank 19, a first pipeline mixer 20, a second pipeline mixer 21, a coagulating sedimentation tank 22, a first intermediate water tank 23, a third water pump 24, an anaerobic reactor 25, a second intermediate water tank 26 and a biological membrane particle sludge reactor 1, removing heavy impurities through the grid tank 17, then entering the grit chamber 18, then entering the regulating tank 19, carrying out balanced regulation of water quality and water quantity, adding a coagulant through the first pipeline mixer 20, adding a flocculant through the second pipeline mixer 21, carrying out coagulation reaction in the coagulating sedimentation tank, generating mud-water separation in the coagulating sedimentation tank after a period of coagulation reaction, feeding supernatant into the first intermediate water tank 23, supplementing nutrient salt, regulating the pH value through an alkali solution and an acid solution, then feeding into the anaerobic reactor 25 through the third water pump 24, carrying out anaerobic reaction, feeding into the second intermediate water tank 26, adding the nutrient salt again, regulating the pH value through the alkali solution and then feeding into the sequential biological membrane particle sludge expansion bed reactor through the second water inlet pump 11, and simultaneously starting the first water pump 3, carrying out biological membrane sludge chemical treatment in the biological membrane sludge circulation reactor 1.
In the embodiment, the sequencing batch biofilm granule sludge expanded bed reactor can independently form a wastewater secondary biological treatment unit, and can also be combined with an anaerobic reactor to form the secondary biological treatment unit, so that the method is efficient and flexible, the efficiency of wastewater biological treatment is integrally improved, and the occupied area is reduced.
Example 3
The technical scheme of this embodiment 3 is the same as that of embodiment 1 except for the following technical features:
As shown in fig. 5, the biofilm granule sludge reactor in embodiment 1 can also adopt an integrated structure, and the aeration system is independently arranged in the circulation reflux zone C, so that the purposes of convenient maintenance and reduced occupied area can be achieved.
The biomembrane particle sludge reactor of the embodiment is provided with a water distribution and gas distribution area, a biomembrane particle sludge reaction area and a circulating reflux area in sequence along the upward direction of wastewater treatment flow;
the biological membrane granular sludge reaction zone comprises a supporting plate 5, a biological carrier bed 7, a limiting plate 9 and an expansion space 8, wherein the biological carrier bed 7 is arranged on the supporting plate 5, and the space between the biological carrier bed 7 and the limiting plate 9 forms the expansion space; the water distribution and air distribution area is provided with a water distribution system 4, an air distribution system 15, a water distributor 6 and a second air blower 14, the air distribution system 15 is connected with the second air blower 14, and the water distributor 6 is arranged on the supporting plate 5; the circulating reflux zone is provided with an aeration system 13, a first air blower 12, a first water inlet pump 3 and a circulating water outlet, the circulating water outlet is connected with the water inlet of the first water inlet pump 3, the water distribution system 4 is connected with the water outlet of the first water inlet pump 3, and the aeration system 13 is connected with the first air blower 12.
The sequencing batch biofilm granule sludge expanded bed reactor is also provided with a water inlet, a water outlet 16 and a back flushing water outlet, wherein the water inlet is arranged in a circulating reflux area C, the water inlet is connected with a second water inlet pump 11, the water outlet 16 is arranged in a biofilm granule sludge reaction area B, and the back flushing water outlet is arranged in a water and air distribution area A.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (6)
1. A wastewater treatment device based on a biomembrane particle sludge reactor, comprising: the system comprises a grid pond, a grit chamber, an adjusting pond water pump, a first pipeline mixer, a second pipeline mixer, a coagulating sedimentation pond, a first intermediate pond and a sequencing batch biofilm granule sludge expanded bed reactor;
The outlet of the grid pond is connected with the inlet of the grit chamber, the outlet of the grit chamber is connected with the inlet of the regulating pond, the outlet of the regulating pond is connected with a first pipeline mixer through a water pump of the regulating pond, the first pipeline mixer is mixed with a coagulant and is connected with a second pipeline mixer, the second pipeline mixer is mixed with a flocculant and is connected with the inlet of a coagulating sedimentation pond, the outlet of the coagulating sedimentation pond is connected with the inlet of a first intermediate pond, and the outlet of the first intermediate pond is connected with a sequencing batch type biomembrane granule sludge expansion bed reactor;
the sequencing batch biofilm granule sludge expanded bed reactor is provided with: the biological carrier bed comprises a water inlet, a supporting plate, a biological carrier bed, a limiting plate, a water distribution system, an air distribution system, a water distributor, an aeration system, a first blower, a second blower, a first water inlet pump and a circulating water outlet;
The water inlet is connected with a water outlet of the second water inlet pump, the biological carrier bed is arranged on the supporting plate, the biological carrier is arranged in an irregular and dispersed mode, an expansion space is formed between the biological carrier bed and the limiting plate, the air distribution system is connected with the second air blower, the water distributor is arranged on the supporting plate, the aeration system is connected with the first air blower, the circulating water outlet is connected with the water inlet of the first water inlet pump, and the water distribution system is connected with the water outlet of the first water inlet pump;
the volume of the expansion space is set to be 1/50-1/20 of the volume of the biological carrier bed;
the inner ring of the biological carrier is provided with granular sludge, the outer ring of the biological carrier is provided with a biological membrane, and the inner ring is internally provided with a separation strip;
The biological carrier adopts hollow particle filler with density less than 1g/cm 3, specific surface area more than 500m 2/m3 and porosity between 60% and 85%.
2. The wastewater treatment device based on the biological membrane granular sludge reactor according to claim 1, further comprising an anaerobic reactor and a second intermediate water tank, wherein the anaerobic reactor inlet is connected with the first intermediate water tank outlet, the anaerobic reactor outlet is connected with the second intermediate water tank inlet, and the second intermediate water tank outlet is connected with the sequencing batch biological membrane granular sludge expanded bed reactor.
3. The wastewater treatment device based on the biomembrane granular sludge reactor as claimed in claim 1, wherein the sequencing batch biomembrane granular sludge reactor is further provided with a circulating aeration tank and a water outlet tank, the water outlet tank is provided with a circulating reflux port, the circulating reflux port is connected with the circulating aeration tank, the aeration system is arranged in the circulating aeration tank, and the circulating water outlet is arranged on the circulating aeration tank.
4. The wastewater treatment device based on the biomembrane particle sludge reactor according to claim 1, wherein the supporting plate is a porous plate, water distributors are uniformly distributed on the through holes of the supporting plate, and wastewater is uniformly distributed along the vertical section of the water flow after passing through the water distributors and passes through the biomembrane particle sludge reaction zone.
5. The wastewater treatment device based on the biological membrane granular sludge reactor according to claim 1, wherein the limiting plate is a porous plate, wastewater enters the circulating reflux zone from the biological membrane granular sludge reaction zone through the through holes in the limiting plate, and the size of the through holes in the limiting plate is smaller than that of the biological carrier.
6. A method for wastewater treatment based on a biofilm granule sludge reactor, characterized in that a wastewater treatment device based on a biofilm granule sludge reactor as claimed in any of claims 1-5 is provided, comprising the steps of:
S1: pretreatment: removing impurities from the production wastewater through a grid pond and a grit chamber, and then entering an adjusting pond to perform balanced adjustment of water quality and water quantity;
S2: and (3) coagulating sedimentation treatment: adding a coagulant when the pretreated wastewater passes through a first pipeline mixer, adding a flocculant when the pretreated wastewater passes through a second pipeline mixer, mixing, entering a coagulating sedimentation tank for coagulation reaction, generating mud-water separation in the coagulating sedimentation tank after coagulation reaction, and extracting supernatant fluid to enter a first intermediate water tank;
s3: adding nutritive salt into the first intermediate water tank, regulating the pH value by using alkali liquor and acid solution, and enabling wastewater to enter a biomembrane particle sludge reactor for biochemical oxidation treatment:
S31: the wastewater in the first intermediate water tank enters the circulating aeration tank, a first water inlet pump is started at the same time, the wastewater in the circulating aeration tank is conveyed to a water distribution system through the first water inlet pump, and enters the biomembrane particle sludge reactor, and when the biomembrane particle sludge reactor is full of wastewater and the wastewater in the circulating aeration tank reaches a set water level, water inlet is stopped;
s32: after water inflow is completed, a first air blower is started, wastewater in a circulating aeration tank is aerated through an aeration system, the wastewater in the circulating aeration tank is conveyed to a water distribution and air distribution area of a biological membrane particle sludge reactor, then the wastewater enters a biological carrier bed for biochemical oxidation treatment, and then enters a circulating reflux area, and the wastewater in the circulating reflux area enters the circulating aeration tank through a circulating reflux port; in the wastewater treatment process, wastewater in the cyclic aeration tank sequentially passes through a water and air distribution area, a biological membrane particle sludge reaction area and a cyclic reflux area of the biological membrane particle sludge reactor to carry out cyclic treatment on the wastewater;
S33: in the circulation treatment of the wastewater, stopping supplying air to the circulation aeration tank for a period of time, and performing the circulation treatment of the wastewater in an anoxic state; after circulation treatment is carried out for a period of time, the operation of the first water inlet pump and the first air blower is stopped, a certain proportion of wastewater is discharged out of the reactor through the water outlet, and the step S31 is executed in a return mode;
S4: and back flushing the biological carrier through a second air blower and an air distribution system, discharging the back flushed waste water out of the reactor through a back flushing water outlet, conveying the waste water to an adjusting tank, and carrying out coagulating sedimentation treatment together with the pretreated waste water.
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| PCT/CN2019/124745 WO2021017367A1 (en) | 2019-07-31 | 2019-12-12 | Wastewater treatment device based on biological film granular sludge reactor, and method therefor |
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