CN113716683B - Tubificidae-dynamic membrane integrated reactor and sewage treatment method thereof - Google Patents
Tubificidae-dynamic membrane integrated reactor and sewage treatment method thereof Download PDFInfo
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- CN113716683B CN113716683B CN202110962348.9A CN202110962348A CN113716683B CN 113716683 B CN113716683 B CN 113716683B CN 202110962348 A CN202110962348 A CN 202110962348A CN 113716683 B CN113716683 B CN 113716683B
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Abstract
The invention discloses a tubificidae-dynamic membrane integrated reactor and a sewage treatment method thereof, comprising a reactor main body, wherein the reactor main body comprises: a sludge hopper positioned at the bottom of the reactor body; a sludge hopper positioned above the sludge hopper; the water distributor and the aeration device are positioned at the bottom of the biological reaction zone; a biological carrier filled in the biological reaction zone; a dynamic membrane module positioned on the top surface of the biological reaction zone; a water outlet weir positioned above the dynamic membrane module; the biological carrier and the dynamic membrane component are respectively attached with a biological membrane and a self-generated dynamic membrane in the running process of the tubificidae-dynamic membrane integrated reactor, and tubificidae is respectively attached on the biological membrane and the self-generated dynamic membrane. According to the invention, on the basis of the existing biological contact oxidation pond, a dynamic membrane is introduced to further improve the water quality of effluent, and tubificidae ingestion sludge is introduced to relieve the pollution problem of the dynamic membrane, so that a tubificidae-biological membrane balance system is created, the sewage treatment efficiency is improved, the residual sludge is reduced, and the running cost is reduced.
Description
Technical Field
The invention belongs to the field of sewage treatment environmental protection engineering, and in particular relates to a method for treating sewage by combining tubificidae with a dynamic membrane and a biological contact oxidation pond.
Background
Membrane bioreactors are increasingly used in wastewater treatment due to their advantages of complete solids retention, flexibility of operation, and small footprint. However, the high operating costs and membrane fouling problems have prevented their widespread use. In this regard, dynamic membranes (Dynamic Membranes, DMs) are an effective alternative to conventional microfiltration and ultrafiltration (MF/UF) membranes, which skillfully use a contaminated layer as a means of solid-liquid separation. DMs are contaminated surfaces formed by suspended solids, colloids, or microbial cell particles deposited on underlying support materials (screens, filter cloths, etc.). Screens in the range of 10-500 μm have been reported to be suitable for DMs formation. The filtration mechanism of DMs differs from that of conventional MF/UF membranes in that after formation of the fouling layer, the filtration resistance is entirely caused by the cake layer.
However, the dynamic membrane is essentially a membrane pollution process, and the dynamic membrane cannot completely avoid the membrane pollution problem, and the filtration performance is reduced due to the excessive growth of a thick and dense pollution layer with reduced permeability. Thus, the dynamic membrane fouling problem has been a hotspot in membrane bioreactor research. Many researchers at home and abroad develop research and study aiming at the pollution problem of the dynamic membrane: the property of the sludge suspension is changed by adding coagulant; prolonging the membrane pollution forming time by changing the running condition of the reactor; chemical cleaning of membranes and the like have the disadvantage of high operating costs for practical large-scale applications. How to solve the membrane pollution problem with low cost and ensure the optimization of the dynamic membrane operation effect is a problem to be solved urgently.
Disclosure of Invention
The invention aims to introduce a dynamic membrane on the basis of the existing biological contact oxidation pond so as to further improve the water quality of effluent, introduce tubificidae ingestion sludge, relieve the pollution problem of the dynamic membrane, create a 'tubificidae-biological membrane' balance system, improve the sewage treatment efficiency, reduce residual sludge and reduce the operation cost.
A tubificidae-dynamic membrane integrated reactor comprising a reactor body, the reactor body comprising:
a sludge hopper located at the bottom of the reactor body;
the biological reaction zone is positioned above the sludge hopper and is separated from the sludge hopper by a porous sieve plate;
the water distributor and the aeration device are both positioned at the bottom of the biological reaction zone, and the water distributor is positioned above the aeration device;
a biological carrier filled in the biological reaction zone;
the dynamic membrane component is positioned on the top surface of the biological reaction zone;
the water outlet weir is positioned above the dynamic membrane component;
the biological carrier and the dynamic membrane component are respectively attached with a biological membrane and a self-generated dynamic membrane in the running process of the tubificidae-dynamic membrane integrated reactor, and the biological membrane and the self-generated dynamic membrane are respectively attached with tubificidae.
After the sewage is treated by the biological reaction area and the dynamic membrane, a stable water layer of about 15cm is formed above the dynamic membrane; the water of the stable water layer is discharged from the water outlet weir and the water outlet. The bottom of the reactor is provided with a porous sieve plate, a sludge hopper is arranged below the sieve plate, and the generated sludge is discharged through a sludge discharge port at the bottom. The sludge hopper and the aeration device are separated by a porous sieve plate.
Inoculating domesticated activated sludge and tubificidae on the surface of a biological carrier, forming a biological film on the surface of the biological carrier by the activated sludge, forming a self-generated dynamic film on the surface of a stainless steel wire mesh, wherein a part of tubificidae is attached to the biological carrier, and a part of tubificidae is attached to a dynamic film component. The dynamic membrane has a certain filtering effect on the activated sludge, and the tubificidae in the biological reaction zone can realize sludge reduction by feeding the activated sludge, so that the pollution and blockage problems of the dynamic membrane are relieved; part of tubificidae is attached to the dynamic membrane and preys the sludge on the dynamic membrane, and the two parts of tubificidae cooperate to enable the dynamic membrane to maintain a stable state. When the tubificidae, the biological film and the dynamic film reach an equilibrium state, a tubificidae-dynamic film equilibrium system is formed, so that the sewage outlet water quality can be improved, and the pollution of the dynamic film can be effectively relieved.
The invention combines the dynamic membrane with the biological contact oxidation pond to treat the wastewater so as to achieve the effect of improving the quality of the effluent; the biological contact oxidation tank and the sedimentation tank are combined to treat wastewater, and the earthworm cast and the sludge are precipitated to a sludge bucket under the action of gravity.
The following provides several alternatives, but not as additional limitations to the above-described overall scheme, and only further additions or preferences, each of which may be individually combined for the above-described overall scheme, or may be combined among multiple alternatives, without technical or logical contradictions.
Optionally, the biological reaction zone is inoculated with activated sludge and the tubificidae, wherein the limnodrilus in the tubificidae accounts for more than 90% of the total amount of the tubificidae.
The tubificidae and the dynamic membrane are combined to treat the wastewater, the sludge in the reactor is ingested by the tubificidae to reduce the concentration of the sludge, and the sludge on the dynamic membrane is ingested to achieve the effect of relieving the pollution of the dynamic membrane.
The dynamic membrane and the porous sieve plate are in a biological reaction zone, and the volume of the biological reaction zone accounts for 60-70% of the volume of the reactor.
Optionally, the biological carrier is porous Mao Zhuqiu filled with polyurethane foam; density of the polyurethane foam: 0.04-0.06g/cm 3 Hardness ILD25%:15.0kg/314cm 2 Tear strength:0.8kg/cm, resistance to strength: 1.34kg/cm 2 Rebound rate: 62%. In the biological reaction zone is provided a porous Mao Zhuqiu, in which polyurethane foam is placed so that tubificidae can attach, and tubificidae can prey on activated sludge and its adsorbed organic pollutant.
Optionally, the dynamic membrane component is arranged within the range of 14-16 cm below the liquid level of the tubificidae-dynamic membrane integrated reactor.
Further, the dynamic membrane component is arranged at a position 15cm below the liquid level of the tubificidae-dynamic membrane integrated reactor.
Optionally, the dynamic membrane component is a stainless steel wire mesh dynamic membrane component, and the mesh number of the stainless steel wires is in the range of 240-270 meshes.
Further, the stainless steel wire mesh number of the dynamic membrane component is 250 mesh.
On the dynamic membrane component, part of tubificidae is attached to the dynamic membrane to prey on the sludge on the dynamic membrane.
The water distributor is a dendritic water distributor which is communicated with a water inlet of the reactor main body; the aeration device is a blast aeration device, and the blast aeration device is externally connected with an air pump.
A porous sieve plate is arranged between the sludge hopper and the biological reaction zone, and can separate sludge from tubificidae, so that the tubificidae cannot settle to the sludge hopper. The aeration device and the dendritic water distribution pipe are fixed above the porous sieve plate.
Optionally, the porous sieve plate is positioned at a position 9-11 cm above the sludge hopper, the thickness of the porous sieve plate is 4-6 cm, and the aperture of the porous sieve plate is 0.2-0.4 mm. The porous sieve plate under the setting condition can separate sludge from tubificidae, so that tubificidae can not settle to a sludge bucket, earthworm cast can enter a buffer zone through the porous sieve plate, finally settle to the sludge bucket, and separation of tubificidae, earthworm cast and sludge can be realized.
Further, the porous sieve plate is positioned at the position 10cm above the sludge hopper, the thickness of the porous sieve plate is 5cm, and the aperture of the porous sieve plate is 0.3mm.
The invention also provides a method for sewage treatment by using the tubificidae-dynamic membrane integrated reactor, which comprises the following steps:
the biological reaction zone is connected with activated sludge and tubificidae, the activated sludge forms a biological film on the biological carrier, a self-generated dynamic film is formed on the dynamic film component, and one part of tubificidae is attached to the biological film of the biological carrier and one part of tubificidae is attached to the self-generated dynamic film of the dynamic film component;
the sewage to be treated is sent into the biological reaction zone through a water distributor, and aeration is carried out in the biological reaction zone through an aeration device;
the effluent after being treated by the biological reaction zone and the dynamic membrane component sequentially forms a stable water layer above the dynamic membrane component, and finally is discharged outside through an effluent weir;
the sludge falls into the sludge hopper through the porous sieve plate and is discharged outside through the sludge hopper;
controlling the concentration of dissolved oxygen, pH, temperature and density of tubificidae in the biological reaction zone to make the tubificidae-dynamic membrane system reach equilibrium state.
Optionally, the concentration of the dissolved oxygen is 1-1.5mg/L, pH and is 6.5-7.5, and the temperature is 24-26 ℃. Under the condition of the parameter, the 'tubificidae-dynamic membrane' system reaches equilibrium.
Further, the concentration of the dissolved oxygen is 1-1.5mg/L, pH and is 7, and the temperature is 25 ℃.
Optionally, the thickness of the biological membrane on the biological carrier is greater than 2mm.
Optionally, the density of the tubificidae is 1.5-3.0 g/L. Further, the density of the tubificidae is 2.5g/L.
Optionally, the aeration device adopts intermittent aeration, and when the transmembrane pressure difference of the dynamic membrane component reaches 35kPa, the aeration rate is increased to 0.2-0.3 m 3 And/h, the purpose of flushing the sludge on the dynamic membrane by air flow and water flow is achieved. At this time, the tubificidae can retract into the biological carrier due to the disturbance of air flow and water flow, and the tubificidae on the dynamic membrane can retract into the sludge layer of the dynamic membrane. The disturbance of air current and rivers can not make all mud on the dynamic membrane drop, and most tubificidae can retract in the mud layer, and mud on the surface drops and makes the mud layer on the dynamic membrane thin, and transmembrane pressure difference drops, alleviates the pollution problem of dynamic membrane. The transmembrane pressure difference is reduced toAnd recovering the conventional aeration rate after the pressure is below 35 kPa.
The invention uses the cheap stainless steel wire mesh material as the membrane component, utilizes the activated sludge to form the autogenous dynamic membrane on the surface of the mesh, and solves the problem of expensive membrane component; the membrane component is combined with biological contact oxidation, so that the quality of effluent water is further improved; the tubificidae is introduced, cultivated on the surface of the dynamic membrane formed in the reaction area, and the pollution problem of the dynamic membrane is solved by feeding sludge by the tubificidae. The method is simple, can improve the existing biological membrane sewage treatment process, has low investment cost and high operation efficiency, and has popularization and application prospects.
According to the invention, the tubificidae and the dynamic membrane are combined to realize synchronous pollutant degradation, sludge reduction and release of the pollution of the dynamic membrane, and then the tubificidae and the dynamic membrane are combined with biological contact oxidation to further improve the quality of the effluent.
Drawings
FIG. 1 is a schematic structural view of the tubificidae-dynamic membrane integrated reactor of the present invention.
Reference numerals shown in the drawings are as follows:
1-water inlet 2-biological reaction zone 3-dynamic membrane assembly
4-Stable water layer 5-sludge bucket 6-buffer zone
7-water outlet weir 8-water outlet 9-mud discharging port
10-biological Carrier 11-aeration device 12-air pump
13-water distributor 14-porous screen plate 15-tubificidae
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
As shown in fig. 1, a tubificidae-dynamic membrane integrated reactor comprises a reactor body, wherein the reactor body comprises: sludge hopper 5, porous sieve plate 14, biological reaction zone 2, water distributor 13, aeration device 11, biological carrier 10, dynamic membrane component 3 and water outlet weir 7.
The sludge hopper 5 is positioned at the bottom of the reactor main body, the biological reaction zone 2 is positioned above the sludge hopper, and the biological reaction zone 2 and the sludge hopper 5 are separated by a porous sieve plate 14; the water distributor 13 and the aeration device 11 are positioned at the bottom of the biological reaction zone 2 and are arranged on the porous sieve plate 14, the water distributor 13 is arranged above the aeration device 11, and the aeration heads and the water distribution ports are staggered; the biological carrier 10 is filled in the biological reaction zone 2; the dynamic membrane component 3 is positioned on the top surface of the biological reaction zone 2, and a biological reaction zone is formed between the dynamic membrane component and the porous sieve plate; after the sewage is treated by the biological reaction area and the dynamic membrane, a stable water layer 4 with the length of about 15cm is formed above the dynamic membrane; the water of the stable water layer is discharged by the water outlet weir 7 and the water outlet 8; the water outlet weir 7 is positioned above the dynamic membrane assembly 3, and the water outlet 8 is positioned at the bottom of the water outlet weir; the biological carrier 10 and the dynamic membrane component 3 are respectively attached with a biological membrane and a self-generated dynamic membrane in the running process of the tubificidae-dynamic membrane integrated reactor, and the biological membrane and the self-generated dynamic membrane are respectively attached with tubificidae 15.
Activated sludge and tubificidae are inoculated in the biological reaction zone, the tubificidae is mainly the limnodrilidae, and accounts for more than 90% of the total amount of the tubificidae, the tubificidae and the dynamic membrane are combined to treat wastewater, and the effects of reducing the sludge concentration by feeding the sludge in the reactor and relieving the pollution of the dynamic membrane by feeding the sludge on the dynamic membrane are achieved.
The biological reaction zone is between the dynamic membrane and the porous screen plate, and the biological carrier is filled in the zone, and in one embodiment, the volume of the biological reaction zone accounts for 60-70% of the volume of the reactor. The reactor volume herein refers to the total volume including the sludge hopper, the biological reaction zone, and the stabilized water layer.
The biological carrier is filled in the biological reaction zone, the filling amount of the biological carrier accounts for 70-80% of the volume capacity of the biological reaction zone, and the biological carrier can be distributed in a mode consistent with the biological carrier in the biological contact oxidation pond. As one embodiment of the biological carrier, the biological carrier is a porous Mao Zhuqiu filled with polyurethane foam, and the polyurethane foam is filled in the porous Mao Zhuqiu; density of the polyurethane foam: 0.04-0.06g/cm 3 Hardness ILD25%:15.0kg/314cm 2 Tear strength: 0.8kg/cm, resistance to strength: 1.34kg/cm 2 Rebound rate: 62%. The limnodrilus belongs to an attached tubificidae, and is favored to be attached to a carrier, the porous Mao Zhuqiu is suitable for limnodrilus activities, and sludge is fully attached to the porous phyllostachys pubescens balls, so that a living place and a food source are provided for the limnodrilus, in order to meet the optimal living condition of the limnodrilus and the dynamic balance of the limnodrilus and a biological membrane, the reactor has a certain denitrification function, the dissolved oxygen of a biological reaction area in the limnodrilus-dynamic membrane integrated reactor is controlled to be 1-1.5mg/L, the density of the limnodrilus is controlled to be 1.5-3 g/L, and the biological membrane thickness on the biological carrier is more than 2mm. The dynamic membrane component is arranged above the biological reaction zone, in one implementation mode, the dynamic membrane component is a stainless steel wire net dynamic membrane component, the mesh number of stainless steel wires is 250 meshes, and the dynamic membrane component is arranged in the range of 14-16 cm below the liquid level of the tubificidae-dynamic membrane integrated reactor, and is preferably arranged at 15cm below the liquid level. When the reactor works, the dynamic membrane reaches a stable stage from a forming stage, the treated water quality is comparable to that of the micro-filtration membrane, the dynamic membrane enters a blocking stage along with the time, and the tubificidae can slow down the formation of membrane pollution by feeding the sludge on the surface of the dynamic membrane.
A layer of porous screen plate 14 is arranged between the sludge hopper 5 and the biological reaction zone 2, which can separate sludge from tubificidae so that the tubificidae cannot settle to the sludge hopper. In one embodiment, the porous screen plate 14 is located at a position 10cm above the sludge hopper 5, the thickness of the porous screen plate is 5cm, the aperture of the screen plate is 0.3mm, sludge in the biological reaction zone 2 and earthworm cast discharged by tubificidae are settled to the sludge hopper 6 through the porous screen plate, and tubificidae is prevented from entering the sludge hopper 6, so that separation of tubificidae and sludge is effectively achieved.
An aeration device 11 and a water distributor 13 are arranged above the porous sieve plate, the aeration device is externally connected with an air pump 12, the water distributor 13 is connected with a water inlet 1 at the bottom of the reactor, in one implementation mode, the water distributor 13 is a dendritic water distributor, and the dendritic water distributor is communicated with the water inlet of the reactor main body; the aeration device selects a disc aerator, is externally connected with an air pump 12, and intermittently aerates, when the transmembrane pressure difference of a dynamic membrane in a membrane separation zone reaches 35kPa, the aeration amount in the reactor is increased, and the tubificidae can be retracted into a biological carrier by air flow disturbance at the moment, so that the purpose of flushing sludge on the dynamic membrane by air flow is achieved, thereby realizing the balance between the activity of the tubificidae and the formation of the dynamic membrane, and forming a 'tubificidae-dynamic membrane' balance system.
The bottom of the sludge bucket 5 is provided with a section of buffer zone 6, a sludge discharge opening 9 is positioned at the bottom of the buffer zone 6, and sludge entering the sludge bucket is discharged out of the reactor through the bottom sludge discharge opening 9.
The reactor body may employ an open rectangular parallelepiped vessel, in one embodiment, the rectangular parallelepiped vessel is 2.0m long, 1.0m wide, and 1.5m high. The height of the stable water layer 4 is 15cm, the upper part of the stable water layer is 20cm super high, and the effective water depth of the reactor is 70cm; the height of the sludge hopper 5 is 25cm, the height of the buffer zone 6 is 15cm, and the gradient is 0.1.
The reactor operates as SBR and includes water inlet, aeration, precipitation and water outlet. Sewage is pumped in from the bottom of the reactor through a water inlet pump, sequentially flows through a biological reaction zone of the reactor main body and a stable water layer, supernatant flows through an effluent weir to discharge water, and sludge and earthworm feces are settled to a sludge hopper under the action of gravity and discharged through a sludge discharge pipe.
Specifically, the method for sewage treatment by using the tubificidae-dynamic membrane integrated reactor comprises the following steps:
the biological reaction zone is connected with activated sludge and tubificidae in an internal mode, a biological film is formed on the biological carrier, a self-growing dynamic film is formed on the dynamic film component, one part of tubificidae is attached to the biological film of the biological carrier, and the other part of tubificidae is attached to the self-growing dynamic film of the dynamic film component;
the sewage to be treated is sent into the biological reaction zone through a water distributor, and aeration is carried out in the biological reaction zone through an aeration device;
the effluent after being treated by the biological reaction zone and the dynamic membrane component sequentially forms a stable water layer above the dynamic membrane component, and finally is discharged outside through an effluent weir;
the sludge falls into the sludge hopper through the porous sieve plate and is discharged outside through the sludge hopper;
controlling the concentration of dissolved oxygen, pH, temperature and density of tubificidae in the biological reaction zone to make the tubificidae-dynamic membrane system reach equilibrium state.
In one embodiment, the concentration of dissolved oxygen is controlled to be 1-1.5mg/L, pH to be 6.5-7.5, the temperature is controlled to be 24-26 ℃, and the density of tubificidae is controlled to be 1.5-3 g/L. Under the condition of the parameter, the 'tubificidae-dynamic membrane' system reaches equilibrium.
In one embodiment, the aeration device adopts intermittent aeration, and when the transmembrane pressure difference of the dynamic membrane component reaches 35kPa, the aeration rate is increased to 0.2-0.3 m 3 And/h, the purpose of flushing the sludge on the dynamic membrane by the air flow is achieved. At this time, the tubificidae on the biological carrier is retracted into the biological carrier due to the disturbance of the air flow, and the tubificidae on the dynamic membrane is retracted into the sludge layer of the dynamic membrane.
Example 1
The limnodrilus is added into the limnodrilus-dynamic membrane integrated reactor according to the ratio of 2.5g/L, so that the limnodrilus is attached to the porous moso bamboo balls and the dynamic membrane component. The reactor was run as SBR: sewage is pumped in from the bottom of the reactor through a water inlet pump, sequentially flows through a biological reaction zone 2 and a stable water layer 3 of the reactor main body, flows through a water outlet weir to discharge water, and sludge and earthworm cast are settled to a sludge bucket under the action of gravity and discharged through a sludge discharge port 9, wherein the period is 6 hours, the water is fed for 1 hour, the aeration is carried out for 2.5 hours, the static precipitation (ingestion) is carried out for 1.5 hours, and the water is discharged for 1 hour.
The reactor is used for treating domestic sewage, and the COD concentration of the inlet water is 300-400mg/L and the ammonia nitrogen concentration is 40mg/L. In the treatment process, the concentration of dissolved oxygen is controlled to be 1-1.5mg/L, pH to be 7, the temperature is 25 ℃, the density of tubificidae is controlled to be 2.5g/L, and when the transmembrane pressure difference of the dynamic membrane component reaches 35kPa, the aeration rate is increased to be 0.2-0.3 m 3 /h, gas and water flowAll sludge on the dynamic membrane can be removed, most of the tubificidae can be retracted into the sludge layer, the sludge on the surface is removed, so that the sludge layer on the dynamic membrane is thinned, the transmembrane pressure difference is reduced, and the conventional aeration is recovered when the transmembrane pressure difference is reduced to be lower than 35 kPa.
The reactor can lead the COD of the effluent to be less than 50mg/L, the SS to be less than 10mg/L and the ammonia nitrogen concentration to be less than 5mg/L, thereby reaching the first grade A standard of pollutant emission standard of urban sewage treatment plants.
The conventional dynamic membrane pollution can form reversible pollution within 10min, irreversible pollution can be formed within 1-2 weeks, and in the embodiment, the dynamic membrane in the reactor can be maintained in the reversible pollution stage for a long time due to the intermittent aeration operation mode of the tubificidae-dynamic membrane integrated reactor and the predation effect of tubificidae on sludge, so that the tubificidae-dynamic membrane integrated reactor can realize sustainable operation.
Comparative example 1
When the transmembrane pressure difference reaches 35kPa, the aeration quantity is less than 0.2m 3 And/h, the sludge layer on the dynamic membrane component is slightly influenced by the water flow and the air flow, and the surface sludge is not easy to fall off, so that the transmembrane pressure difference is not reduced; aeration is greater than 0.3m 3 And/h, most of sludge in the sludge layer is washed out, so that the dynamic film formed originally is destroyed, and most of tubificidaes in the sludge layer cannot be attached to the sludge layer. Both of the above conditions can negatively affect the quality of the effluent.
When the transmembrane pressure difference reaches more than 37kPa, the aeration rate is required to be increased when the permeability of the dynamic membrane is recovered, and at the moment, the tubificidae attached to the sludge layer of the dynamic membrane can be separated from the sludge layer to enter the water body, so that the effect of the tubificidae attached to the dynamic membrane can be reduced. And excessive transmembrane pressure differences can produce irreversible fouling of the dynamic membrane, negatively impacting subsequent reactor maintenance.
Comparative example 2
By comparing sludge reduction effects of 0, 0.8g/L, 1.6g/L, 2.5g/L, 3.3g/L and 4.1g/L of tubificidae, the sludge reduction effects can be better when the sludge reduction effects are 1.6g/L, 2.5g/L and 3.3g/L, and the sludge reduction effect is the best when the sludge reduction effects are 2.5g/L. Specifically, when the density of the tubificidae is less than 2.5g/L and greater than 2.5g/L, the average sludge reduction is about 200mg/L, when the density of the tubificidae is 2.5g/L, the average sludge reduction is about 240mg/L, so that the faster the sludge layer on the dynamic membrane is formed, the easier the pollution of the dynamic membrane is formed, and therefore, when the density of the tubificidae is 2.5g/L, the effect of relieving the pollution of the dynamic membrane is best, and preferably 1.5g/L to 3g/L.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (8)
1. A tubificidae-dynamic membrane integrated reactor comprising a reactor body, the reactor body comprising:
a sludge hopper located at the bottom of the reactor body;
the biological reaction zone is positioned above the sludge hopper and is separated from the sludge hopper by a porous sieve plate;
the water distributor and the aeration device are both positioned at the bottom of the biological reaction zone, and the water distributor is positioned above the aeration device;
a biological carrier filled in the biological reaction zone;
the dynamic membrane component is a stainless steel wire mesh dynamic membrane component, and the mesh number of the stainless steel wires is in the range of 240-270 meshes; the dynamic membrane component is positioned on the top surface of the biological reaction zone and is within the range of 14-16 cm below the liquid level of the tubificidae-dynamic membrane integrated reactor;
the water outlet weir is positioned above the dynamic membrane component;
the biological carrier and the dynamic membrane component are respectively attached with a biological membrane and a self-generated dynamic membrane in the running process of the tubificidae-dynamic membrane integrated reactor, and tubificidae is respectively attached on the biological membrane and the self-generated dynamic membrane.
2. The tubificidae-dynamic membrane integrated reactor of claim 1, wherein the biological reaction zone receives activated sludge and the tubificidae, wherein the limnodrilus comprises more than 90% of the total amount of tubificidae.
3. The tubificidae-dynamic membrane integrated reactor according to claim 1, wherein the biological reaction zone volume is 60-70% of the total reactor volume.
4. The tubificidae-dynamic membrane integrated reactor according to claim 1, wherein the biological carrier is a porous Mao Zhuqiu filled polyurethane foam; density of the polyurethane foam: 0.04-0.06g/cm 3 Hardness ILD25%:15.0kg/314cm 2 Tear strength: 0.8kg/cm, resistance to strength: 1.34kg/cm 2 Rebound rate: 62%.
5. The tubificidae-dynamic membrane integrated reactor according to claim 1, wherein the porous sieve plate is positioned at a position 9-11 cm above the sludge hopper, the thickness of the porous sieve plate is 4-6 cm, and the pore diameter of the porous sieve plate is 0.2-0.4 mm.
6. A method for sewage treatment using the tubificidae-dynamic membrane integrated reactor as claimed in any one of claims 1 to 5, comprising:
the biological reaction zone is connected with activated sludge and tubificidae, the activated sludge forms a biological film on a biological carrier, a self-generated dynamic film is formed on a dynamic film component, and one part of tubificidae is attached to the biological film of the biological carrier and one part of tubificidae is attached to the self-generated dynamic film of the dynamic film component;
the sewage to be treated is sent into the biological reaction zone through a water distributor, and aeration is carried out in the biological reaction zone through an aeration device;
the effluent after being treated by the biological reaction zone and the dynamic membrane component sequentially forms a stable water layer above the dynamic membrane component, and finally is discharged outside through an effluent weir;
the sludge falls into the sludge hopper through the porous sieve plate and is discharged outside through the sludge hopper;
controlling the concentration, pH, temperature and density of the dissolved oxygen in the biological reaction zone to make the tubificidae-dynamic membrane system reach an equilibrium state; the concentration of the dissolved oxygen is 1-1.5mg/L, pH and is 6.5-7.5, and the temperature is 24-26 ℃; the density of the tubificidae is 1.5-3 g/L.
7. The method of claim 6, wherein the thickness of the biofilm on the biological carrier is greater than 2mm.
8. The method according to claim 6, wherein the aeration device adopts intermittent aeration, and the aeration rate is increased to 0.2-0.3 m when the transmembrane pressure difference of the dynamic membrane assembly reaches 35kPa 3 /h。
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| CN101580332B (en) * | 2009-06-25 | 2011-05-25 | 浙江工商大学 | Tubificidae-microorganism symbiotic system muddy water degradation batch reactor and application thereof |
| CN101671103B (en) * | 2009-09-24 | 2011-06-01 | 浙江工商大学 | Contact type tubificidae sludge decrement reactor and application thereof |
| CN201634497U (en) * | 2009-11-13 | 2010-11-17 | 诸暨市菲达宏宇环境发展有限公司 | Water earthworm ecological reactor and sewage treatment system thereof |
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