CN113185029A - Half-process coagulation membrane filtration integrated sewage treatment system and process - Google Patents
Half-process coagulation membrane filtration integrated sewage treatment system and process Download PDFInfo
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- CN113185029A CN113185029A CN202110511185.2A CN202110511185A CN113185029A CN 113185029 A CN113185029 A CN 113185029A CN 202110511185 A CN202110511185 A CN 202110511185A CN 113185029 A CN113185029 A CN 113185029A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
- B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
- B01F2101/305—Treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
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Abstract
The invention discloses a half-way coagulation membrane filtration integrated sewage treatment system and a process, which comprises the following steps: the system comprises a wastewater collecting tank, a rotational flow sand settling machine, a static mixer, a membrane filtering device and a water storage tank which are connected in sequence; a coarse grid is arranged at a water inlet of the wastewater collection tank, and a submersible sewage pump is arranged in the tank; a dosing port is arranged on the static mixer; a plurality of rows of membrane filtering components are arranged at the middle position above the inside of the membrane filtering device; the bottom of the membrane filtering component is integrally provided with an aeration system for providing upward wind power; the lower part of the membrane filtering device is funnel-shaped, and the opening at the bottom of the membrane filtering device is provided with a sludge pump. The invention can only destabilize and agglomerate the particles in the wastewater entering the membrane filtering device to generate small flocs by regulating and controlling the medicament added into the static mixer, the particle size of the flocs is larger than that of the membrane holes, and the flocs do not need to flocculate or settle, thereby not only reducing the medicament dosage, but also shortening the medicament reaction time, shortening the sewage treatment flow and effectively saving the occupied area of the system.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a half-way coagulation membrane filtration integrated sewage treatment system and process.
Background
The shield method is a fully mechanical construction method in the construction of the subsurface excavation method, which is a mechanical construction method for pushing a shield machine in the ground, preventing collapse into a tunnel by using a shield shell and duct pieces to support surrounding rocks around, excavating a soil body in front of an excavation surface by using a cutting device, transporting out of the tunnel by using an unearthing machine, pressing and jacking at the rear part by using a jack, and assembling precast concrete duct pieces to form a tunnel structure. The comprehensive water consumption required by the shield tunnel for driving 1 meter is up to 40 tons, and the same amount of construction wastewater is discharged, the concentration SS of the construction wastewater is up to 4000mg/L, the turbidity is up to 480NTU, and the SS required in the first-level A standard is lower than 10mg/L, so that the water pollution is reduced, the sewage reuse rate is improved, and the inevitable trend of environmental protection and industrial development is realized.
The high-SS and high-turbidity construction wastewater needs to achieve a precipitation effect by adding a coagulant and a flocculant, the precipitation time of 2 hours or more is needed when the construction wastewater enters a precipitation tank, and then the supernatant flows out. The traditional process achieves the clarification of the surface of a clean water tank by precipitating inorganic pollutants. The method comprises the steps of primarily removing partial inorganic pollutants and oils through a primary sedimentation tank and an oil separation tank, then enabling the inorganic pollutants and the oils to enter an adjusting tank, enabling tank water of the adjusting tank to flow into a coagulation tank, adding a coagulant, enabling the coagulation tank to pass through a flocculation tank, adding a flocculant, and then enabling the coagulation tank to enter a sedimentation tank to achieve the effect of coagulating sedimentation. The traditional coagulating sedimentation process needs longer time, and has the problems of unstable effluent quality, large dosage, large occupied area and the like.
Therefore, the development of an energy-saving, environment-friendly and efficient construction sewage treatment process is urgently needed.
Disclosure of Invention
In view of the above, the invention provides a half-way coagulation membrane filtration integrated sewage treatment system and a half-way coagulation membrane filtration integrated sewage treatment process, and the specific technical scheme is as follows:
the utility model provides a half journey thoughtlessly congeals membrane filtration integration sewage treatment system, includes: the sewage treatment system comprises a wastewater collection tank, a rotational flow sand settling machine, a half-course coagulation membrane filtration integrated sewage treatment device and a water storage tank, wherein the half-course coagulation membrane filtration integrated sewage treatment device comprises a static mixer and a membrane filtration device; a coarse grid is arranged at a water inlet of the wastewater collecting tank, and a submersible sewage pump is arranged in the tank; the water outlet of the submersible sewage pump is upwards connected with a first water outlet pipeline; a water outlet above the first water outlet pipeline is connected with a water inlet of the rotational flow sand settling machine, and a water outlet of the rotational flow sand settling machine is connected with a water inlet of the static mixer; the water outlet of the static mixer is connected with the membrane filtering device, and a medicine feeding port is formed in the static mixer; a plurality of rows of membrane filtering components are arranged at the middle position above the inside of the membrane filtering device, purified water outlets of the membrane filtering components in the rows are all connected with a water inlet of a second water outlet pipeline positioned outside the membrane filtering device, a water outlet of the second water outlet pipeline is connected with the water storage tank, and a suction pump and a backwashing pump are arranged on the second water outlet pipeline; the bottom of the membrane filtering component is integrally provided with an aeration system for providing upward wind power, and the aeration system is connected with an air pump arranged outside the membrane filtering device; the lower part of the membrane filtering device is funnel-shaped, and a sludge discharge pump is arranged at the opening at the bottom of the membrane filtering device.
By adopting the technical scheme, the invention has the following advantages: saving the occupied area: the invention can save 50% of the floor area by combining six units of the primary sedimentation tank, the oil separation tank, the regulating tank, the coagulation tank, the flocculation tank and the sedimentation tank in the traditional process into a unit of a half-way coagulation membrane filtration integrated sewage treatment device consisting of a static mixer and a membrane filtration device. Secondly, the process is greatly shortened: the invention combines coagulation and membrane filtration, does not need a sedimentation tank and saves at least 2 hours. And thirdly, reducing the dosage of the medicament: the invention adopts half-way coagulation, reduces the use of a coagulant, does not need a flocculating agent, and predicts that the dosage of the medicament is reduced by 60 percent.
Moreover, the invention can save the reaction time of the medicament by adopting the half-way coagulation and membrane filtration treatment technology, and the medicament can enter the membrane filtration device only by reacting into small flocs, thereby correspondingly shortening the flow.
The aeration system in the membrane filtering device blows air upwards, so that an aerobic environment is provided for the interior of the membrane filtering device, and organic matter degradation is facilitated; secondly, the active strains in the membrane filtration device are not easy to attach to the membrane of the membrane filtration component, so that the active strains can degrade organic pollutants more fully; thirdly, some sludge adsorbed on the surface of the membrane can be blown off, so that the membrane has a better filtering effect; fourthly, the dispersion of the precipitated aggregates can be prevented to cause the turbidity of the membrane pool.
The membrane filtration device integrates coagulation, membrane filtration, biochemical treatment, solid-liquid separation and sludge discharge, and further realizes high integration of the device.
Preferably, the submersible sewage pumps are suspended and hung in the wastewater collection pool and controlled by floating ball liquid level devices, and the number of the submersible sewage pumps is generally 1-2.
Preferably, the wastewater in the cyclone sand settling machine naturally overflows and flows into the static mixer, so that the wastewater can be more fully reacted in the static mixer.
Preferably, the dosing port is positioned above the static mixer and close to one side of the water inlet of the static mixer, a check valve is arranged on the dosing port, and the dosing port is externally connected with a dosing pump; and a drain port is arranged on one side of the lower part of the static mixer, which is close to the water outlet of the static mixer.
Preferably, a row of inclined partition plates are arranged in the inner space of the static mixer along the water flowing direction, the corresponding ends of the two adjacent inclined partition plates are respectively connected with the inner top surface and the inner bottom surface of the static mixer, and the other ends of the inclined partition plates are free ends. The inclined partition plate can prolong the reaction time of the medicament and the waste water, so that the medicament and the waste water can react more fully in the static mixer.
Preferably, one side of the inside of the membrane filtering device, which is close to the water inlet of the membrane filtering device, is provided with a guide inclined plate, the top end of the guide inclined plate is fixed with the inner top surface of the membrane filtering device, and the bottom end of the guide inclined plate extends downwards in an inclined mode. The guide inclined plate can guide the aggregates in the wastewater to move downwards, and the aggregates are helped to settle.
Preferably, the lower part of the guide inclined plate is gradually inclined towards one side close to the water inlet of the membrane filtering device so as to better obstruct the aggregates.
Preferably, the lowermost end of the inclined guide plate should be lower than the lowermost end of the membrane filtration module.
Preferably, the membrane in the membrane filtration component is an ultrafiltration membrane, and the turbidity of the membrane effluent is less than or equal to 0.2NTU, which is better than that of the effluent in a sedimentation tank by less than or equal to 10 NTU. The invention adopts the ultrafiltration membrane, strengthens the solid-liquid separation efficiency and ensures that the effluent quality reaches the standard.
A half-way coagulation membrane filtration integrated sewage treatment process comprises the following steps:
s1: collecting construction wastewater, filtering the construction wastewater by a coarse grating, and introducing the construction wastewater into a wastewater collection tank;
s2: lifting the wastewater in the wastewater collection tank to a rotational flow sand setting machine for sand removal;
s3: the water after sand removal in the cyclone sand settling machine naturally overflows and flows out, and enters a static mixer to react with a coagulant added in proportion;
s4: the water which is reacted in the static mixer to reach the preliminary coagulation degree enters a membrane filtering device, is precisely filtered by a membrane filtering component and then flows into a water storage tank through a suction pump;
s5: water in the water storage tank is extracted to a required position through a booster pump;
s6: the aggregate accumulated at the bottom of the membrane filtration device is discharged by a sludge discharge pump.
In the half-process coagulation membrane filtration integrated sewage treatment process, the agent added into the static mixer needs to be regulated and controlled, so that particles in the wastewater entering the membrane filtration device only need to be destabilized and agglomerated to generate small flocs, the particle size of the flocs is larger than that of membrane pores, flocculation or sedimentation is not needed, the agent dosage is reduced, the agent reaction time is shortened, and the sewage treatment flow is shortened.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic view of the overall structure of a half-way coagulation membrane filtration integrated sewage treatment system of the present invention.
FIG. 2 is a schematic view of the structure of the static mixer of the present invention.
FIG. 3 is a flow chart of the half-way coagulation membrane filtration integrated sewage treatment process of the invention.
FIG. 4 is a flow chart of a conventional wastewater treatment process.
In the figure: 1-a wastewater collection tank, 2-a cyclone sand settling machine, 3-a static mixer, 4-a membrane filtering device, 5-a water storage tank, 6-a coarse grid, 7-a submersible sewage pump, 8-a membrane filtering component, 9-a suction pump and a backwashing pump, 10-an aeration system, 11-an air pump, 12-a sludge pump, 13-a dosing port, 14-an evacuation port, 15-an inclined partition plate and 16-a guide inclined plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments 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 of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b):
as shown in fig. 1 to 3, the present invention provides a half-way coagulation membrane filtration integrated sewage treatment system, including: waste water collecting tank 1, cyclone sand settling machine 2, half way coagulation membrane filtration integration sewage treatment device and tank 5, wherein, half way coagulation membrane filtration integration sewage treatment device includes static mixer 3, membrane filter equipment 4 again.
A coarse grating 6 is arranged at a water inlet of the wastewater collecting tank 1, and the coarse grating 6 is used for intercepting solid wastes of larger particles and needs to be cleaned by workers at regular intervals; install 1 ~ 2 stealthily dirty pumps 7 in the pond of waste water collecting pit 1, stealthily dirty pump 7 is unsettled to be hung in waste water collecting pit 1 to through the control of floater level gauge.
A water outlet of the submersible sewage pump 7 is upwards connected with a first water outlet pipeline so as to lift the wastewater subjected to preliminary precipitation in the wastewater collection tank 1; and a water outlet above the first water outlet pipeline is connected with a water inlet of the cyclone sand settling machine 2, and a water outlet of the cyclone sand settling machine 2 is connected with a water inlet of the static mixer 3.
It should be noted that the swirling flow sand settling machine 2 used in the present invention is a swirling flow sand settling machine commonly used in the prior art, such as the swirling flow sand settling machine disclosed in the utility model with the option of the publication number CN 208641889U, and therefore, the specific structure of the swirling flow sand settling machine is not specifically described herein.
The water outlet of the static mixer 3 is connected with the membrane filtering device 4, the static mixer 3 is provided with a dosing port 13, the dosing port 13 is positioned above the static mixer 3 and close to one side of the water inlet of the static mixer, the dosing port 13 is provided with a check valve, and the dosing port 13 is externally connected with a dosing pump; and a drain port 14 is also arranged at one side of the lower part of the static mixer 3 close to the water outlet thereof.
The wastewater after desanding in the cyclone sand settling machine 2 can naturally overflow and flow into the membrane filtering device 4, the dosing pump is started while the wastewater passes through the static mixer, and coagulant is dosed in proportion to enable the wastewater to be subjected to primary coagulation.
Further, a row of inclined partition plates 15 are arranged in the inner space of the static mixer 3 along the water flowing direction, corresponding ends of two adjacent inclined partition plates 15 are respectively connected with the inner top surface and the inner bottom surface of the static mixer 3, and the other ends of the inclined partition plates 15 are free ends. The inclined partition plate 15 effectively prolongs the path length of the wastewater passing through the static mixer 3, and further prolongs the reaction time of the medicament, so that the medicament can react more fully.
One side of the inside of the membrane filtering device 4 close to the water inlet thereof is provided with a guide inclined plate 16 for intercepting the aggregates, the top end of the guide inclined plate 16 is fixed with the inner top surface of the membrane filtering device 4, and the bottom end extends downwards in an inclined way.
Further, the lower portion of the guide slope plate 16 is gradually inclined toward the side close to the water inlet of the membrane filtering device 4. And, the lowermost end of the guide slope plate 16 should be lower than the lowermost end of the membrane filtration module 8.
A plurality of rows of membrane filtering components 8 for precisely filtering the wastewater are arranged at the middle positions above the inside of the membrane filtering device 4, the membranes in the membrane filtering components 8 are ultrafiltration membranes for intercepting small particles, and the turbidity of membrane effluent is less than or equal to 0.2 NTU; the purified water outlets of the rows of membrane filtering components 8 are connected with the water inlets of second water outlet pipelines positioned outside the membrane filtering devices 4, the water outlets of the second water outlet pipelines are connected with the water storage tank 5, and meanwhile, the second water outlet pipelines are provided with a suction pump and a backwashing pump 9.
The bottom of the membrane filtering component 8 is integrally provided with an aeration system 10 for providing upward wind power, and the aeration system 10 is connected with an air pump 11 arranged outside the membrane filtering device 4.
The lower part of the membrane filtering device 4 is in a funnel shape which is convenient for the aggregates to fall into, and the opening at the bottom of the membrane filtering device is provided with a sludge discharge pump 12, wherein the sludge discharge pump 12 is preferably a screw pump and is used for transporting the aggregates accumulated for a long time.
The waste discharged by the cyclone sand settling machine 2 and the sludge pump 12 can be sent into the waste water collecting tank 1 to be treated together.
The water SS sucked into the water storage tank 5 by the suction pump is low and stable, the water quality reaching the standard can be used for spraying, washing the ground, flushing a transport vehicle and the like on a working site, and generally, the clear water is extracted to a required position by a booster pump.
In this embodiment, the invention further provides a half-way coagulation membrane filtration integrated sewage treatment process, which includes the following steps:
s1: collecting construction wastewater, filtering the construction wastewater by a coarse grating 6, and introducing the construction wastewater into a wastewater collecting tank 1;
s2: lifting the wastewater in the wastewater collection tank 1 to a cyclone sand setting machine for desanding;
s3: the water after desanding in the cyclone sand settling machine 2 overflows naturally and flows out, and enters a static mixer 3 to react with a coagulant added in proportion;
s4: the water which is reacted in the static mixer 3 to reach the preliminary coagulation degree enters the membrane filtering device 4, is precisely filtered by the membrane filtering component 8 and then flows into the water storage tank 5 through the suction pump;
s5: water in the water storage tank 5 is extracted to a required position through a booster pump;
s6: the aggregates accumulated at the bottom of the membrane filtration unit 4 are discharged by a sludge discharge pump 12.
In the above process steps, the agent added into the static mixer 3 needs to be regulated and controlled, so that the particles in the wastewater entering the membrane filtration device 4 only undergo destabilization and agglomeration to generate small flocs, and flocculation or sedimentation is not needed, and the particle size of the flocs formed in the way can reach 0.2-600 μm and is 0.1 μm larger than the pore size of the membrane, and the membrane pores are not blocked.
Meanwhile, the working personnel can flexibly adjust the process treatment capacity by adjusting the membrane area and the number of the membrane filtering assemblies 8.
The half-way coagulation membrane filtration integrated sewage treatment system provided by the invention integrates separation units such as coagulation, sedimentation, biochemical treatment and filtration by using an ultrafiltration membrane, realizes union treatment, has high integration degree, and is suitable for being installed and used in occasions with limited construction area space such as subway tunnels.
As shown in fig. 4, the conventional coagulation-sedimentation process achieves surface clarification of a clean water tank by sedimentation of inorganic pollutants, and comprises six units, namely a primary sedimentation tank, an oil separation tank, an adjusting tank, a coagulation tank, a flocculation tank and a sedimentation tank, and has the defects of large dosage, long flow, 2 hours of sedimentation and the like; and after entering the membrane filtration device 4, the floc is intercepted by membrane holes in the membrane filtration component 8 and settled at the bottom of the membrane filtration device 4, and is automatically discharged by a sludge discharge pump 12. The membrane filtering device 4 can also use a backwashing pump to perform automatic backwashing periodically, and the effect of automatic treatment is achieved.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides a half journey thoughtlessly congeals membrane filtration integration sewage treatment system which characterized in that includes: the sewage treatment system comprises a wastewater collection tank, a rotational flow sand settling machine, a half-course coagulation membrane filtration integrated sewage treatment device and a water storage tank, wherein the half-course coagulation membrane filtration integrated sewage treatment device comprises a static mixer and a membrane filtration device; a coarse grid is arranged at a water inlet of the wastewater collecting tank, and a submersible sewage pump is arranged in the tank; the water outlet of the submersible sewage pump is upwards connected with a first water outlet pipeline; a water outlet above the first water outlet pipeline is connected with a water inlet of the rotational flow sand settling machine, and a water outlet of the rotational flow sand settling machine is connected with a water inlet of the static mixer; the water outlet of the static mixer is connected with the membrane filtering device, and a medicine feeding port is formed in the static mixer; a plurality of rows of membrane filtering components are arranged at the middle position above the inside of the membrane filtering device, purified water outlets of the membrane filtering components in the rows are all connected with a water inlet of a second water outlet pipeline positioned outside the membrane filtering device, a water outlet of the second water outlet pipeline is connected with the water storage tank, and a suction pump and a backwashing pump are arranged on the second water outlet pipeline; the bottom of the membrane filtering component is integrally provided with an aeration system for providing upward wind power, and the aeration system is connected with an air pump arranged outside the membrane filtering device; the lower part of the membrane filtering device is funnel-shaped, and a sludge discharge pump is arranged at the opening at the bottom of the membrane filtering device.
2. The half-range coagulation membrane filtration integrated sewage treatment system according to claim 1, wherein the submersible sewage pump is suspended and hung in the wastewater collection tank and is controlled by a floating ball liquid level controller.
3. The half-range coagulation membrane filtration integrated sewage treatment system according to claim 1, wherein the dosing port is positioned above the static mixer and close to one side of the water inlet of the static mixer, a check valve is arranged on the dosing port, and a dosing pump is connected outside the dosing port; and a drain port is arranged on one side of the lower part of the static mixer, which is close to the water outlet of the static mixer.
4. The half-range coagulation membrane filtration integrated sewage treatment system according to claim 1 or 3, wherein a row of inclined partition plates are arranged in the internal space of the static mixer along the water flowing direction, the corresponding ends of two adjacent inclined partition plates are respectively connected with the inner top surface and the inner bottom surface of the static mixer, and the other ends of the inclined partition plates are free ends.
5. The half-range mixed coagulation membrane filtration integrated sewage treatment system according to claim 1, wherein a side of the inside of the membrane filtration device close to the water inlet thereof is provided with a guide inclined plate, the top end of the guide inclined plate is fixed with the inner top surface of the membrane filtration device, and the bottom end of the guide inclined plate extends obliquely downwards.
6. The half-range mixed coagulation membrane filtration integrated sewage treatment system according to claim 5, wherein the lower portion of the guide inclined plate is gradually inclined to a side close to the water inlet of the membrane filtration device.
7. The half-range mixed coagulation membrane filtration integrated sewage treatment system according to claim 5 or 6, wherein the lowermost end of the inclined guide plate is lower than the lowermost end of the membrane filtration module.
8. The half-way coagulation membrane filtration integrated sewage treatment system of claim 1, wherein a membrane in the membrane filtration module is an ultrafiltration membrane, and the turbidity of membrane effluent is less than or equal to 0.2 NTU.
9. The half-way coagulation membrane filtration integrated sewage treatment process is characterized by comprising the following steps of:
s1: collecting construction wastewater, filtering the construction wastewater by a coarse grating, and introducing the construction wastewater into a wastewater collection tank;
s2: lifting the wastewater in the wastewater collection tank to a rotational flow sand setting machine for sand removal;
s3: the water after sand removal in the cyclone sand settling machine naturally overflows and flows out, and enters a static mixer to react with a coagulant added in proportion;
s4: the water which is reacted in the static mixer to reach the preliminary coagulation degree enters a membrane filtering device, is precisely filtered by a membrane filtering component and then flows into a water storage tank through a suction pump;
s5: water in the water storage tank is extracted to a required position through a booster pump;
s6: the aggregate accumulated at the bottom of the membrane filtration device is discharged by a sludge discharge pump.
10. The integrated sewage treatment process of claim 9, wherein the chemical added into the static mixer is regulated and controlled to ensure that the particles in the wastewater entering the membrane filtration device are only destabilized and aggregated to form small flocs without flocculation or sedimentation.
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