CN111547898A - Back flush wastewater backflow flocculation filter equipment - Google Patents
Back flush wastewater backflow flocculation filter equipment Download PDFInfo
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- CN111547898A CN111547898A CN202010549170.0A CN202010549170A CN111547898A CN 111547898 A CN111547898 A CN 111547898A CN 202010549170 A CN202010549170 A CN 202010549170A CN 111547898 A CN111547898 A CN 111547898A
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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
- C02F1/52—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
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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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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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
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/42—Liquid level
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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
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
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Abstract
The invention provides a backwashing wastewater backflow flocculation filtration device which comprises a water inlet pipe, a tubular static mixer, a mixing flocculation tank, a filter tank, a backwashing wastewater backflow system, a water outlet pipe and a control device, wherein raw water sequentially passes through the water inlet pipe, the tubular static mixer, the mixing flocculation tank and the filter tank and then is output from the water outlet pipe; the invention solves the problem of low-temperature and low-turbidity water treatment, utilizes partial back-flushing wastewater to flow back, enables micro suspended matters in raw water to be fully flocculated to form fine flocculating constituents, and directly filters and removes the fine flocculating constituents through the filter tank, thereby achieving the purpose of purifying water quality, greatly improving the water treatment effect, providing safe, stable and high-quality drinking water and greatly reducing the investment cost.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a backwashing wastewater backflow flocculation filtering device.
Background
Water with a temperature below 10 ℃ and a turbidity below 30NTU is generally referred to as low temperature and low turbidity water. The water quality of water sources in most areas in the north of China is the same in winter, the water temperature in the winter in the south is generally 3-7 ℃, the turbidity is generally changed between 2-50NTU, and the conditions of low temperature and low turbidity are also met. The low-temperature low-turbidity water has low temperature, high viscosity, few particles and small particle size, and the low-temperature low-turbidity water is the main reason for influencing sedimentation. The turbidity is low, namely the content of large granular substances such as clay and the like is low, and the impurity concentration is low, so that the probability of particle contact and collision is low, and the particle collision and sedimentation are not facilitated; at low temperature, the diffusion movement of small particles is weakened, the viscosity coefficient of water is increased, the molecular thermal movement is slow, the probability of mutual collision is low, the colloid stability is enhanced, destabilization is difficult, and the water quality is difficult to purify. In addition, the hydrolysis of the medicament is influenced by low water temperature, the hydrolysis speed of aluminum and iron salts of the inorganic salt coagulant is very slow, the water viscosity is high, the water flow shearing force is increased, and the particle collision is not facilitated, so that the coagulation effect is poor, the floc is small and loose, and the formed floc impurity particles are difficult to remove by precipitation. Even if the dosage is increased, the water quality standard of drinking water can not be achieved by using the conventional feed water purification process, other problems can be caused, and the operation cost is increased, so that the treatment of low-temperature low-turbidity water is a difficult problem of the current feed water treatment system.
In the prior art, various measures are also taken for treating low-temperature and low-turbidity water, including a micro-flocculation direct filtration method, a carrier flocculation technology, a membrane method and an air floatation method.
The micro-flocculation direct filtration method is a clarification process in which after a coagulant is added into raw water, the raw water is stirred and mixed, the flocculation time is short, fine flocs are formed after rapid flocculation, and then the fine flocs enter a filtration process, and impurities are trapped by utilizing the adhesion and adsorption effects of a filter material. However, the removal effect of the process is not stable in engineering application.
The carrier flocculation technology refers to a physical and chemical process for improving the settleability of suspended particles through circulation of insoluble medium particles and adsorption of a polymeric flocculant. The method is characterized in that high-density insoluble medium particles (fine sand) are added in a coagulation stage, the generation of flocs is accelerated by utilizing the gravity settling of a medium and the adsorption action of a carrier, and dense flocs are quickly generated.
The membrane treatment method is intended to separate particles such as ions or molecules in water by utilizing the special permeability of a medium such as a membrane and applying external power, but has high investment and running cost.
The dissolved air flotation method is characterized in that a pressure container is utilized to suddenly decompress and release a large amount of micro-fine bubbles in water, flocs formed after a dosing coagulation reaction are adsorbed on the surfaces of the bubbles, and the bubbles with the flocs float to the water surface due to the fact that the density of the bubbles is smaller than that of the water, so that scum is formed and is scraped by a scum scraper, and the purpose of removing turbidity is achieved.
Patent document CN110902885A discloses a water treatment system, relates to water treatment's technical field, has solved present filter equipment and has need the unable problem that adapts to the use in the region of not supplying power of power consumption, and its technical scheme main points are: comprises a water inlet tower, a primary filter, a precision filter and a water collecting tank which are sequentially connected through a pipeline and gradually descend in height; a water collecting hopper for receiving mountain spring water is arranged above the water inlet tower; the primary filter comprises a tank body and a honeycomb inclined plate arranged in the tank body, a water inlet and a water outlet are formed in the side wall of the primary filter, the water outlet is positioned above the water inlet, and the honeycomb inclined plate is positioned between the water outlet and the water inlet; the precision filter comprises a cylinder body and a quartz sand filtering medium arranged in the cylinder body, water entering the precision filter firstly passes through the quartz sand filtering medium and then flows out of the precision filter to enter a water collecting pool, but the problem of low-temperature and low-turbidity water treatment cannot be efficiently solved by the design.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a backwashing wastewater backflow flocculation filtering device.
The invention provides a backwashing wastewater backflow flocculation filtration device which comprises a water inlet pipe, a tubular static mixer, a mixing flocculation tank, a filter tank, a backwashing wastewater backflow system, a water outlet pipe, a backwashing device and a control device, wherein the water inlet pipe is connected with the tubular static mixer;
raw water passes through the water inlet pipe, the tubular static mixer, the mixing flocculation tank and the filter tank in sequence and then is output from the water outlet pipe;
the filter tank is internally provided with a drainage channel and a filtering area, the filtering area is internally provided with a filter material, the backwashing device can remove filter matters in the filter material through water drainage and/or air discharge to form wastewater, the wastewater enters the drainage channel, and the wastewater in the drainage channel enters a backwashing wastewater backflow system and is finally conveyed to the mixed flocculation tank;
a first turbidity meter is arranged on the water inlet pipe, and a second turbidity meter is arranged on the water outlet pipe;
the first turbidity meter, the second turbidity meter, the backwashing wastewater backflow system and the backwashing device are respectively in signal connection with the control device.
Preferably, a pore plate is arranged at the inlet end of the tubular static mixer, a plurality of helical blades are arranged inside the tubular static mixer, and a plurality of dosing holes are arranged on the tubular static mixer;
the helical blade adopts the structure of 80 twists, and every two adjacent helical blade rotation direction are opposite and are 90 contained angles and arrange.
Preferably, the mixed flocculation tank comprises a coagulation lattice and a flocculation area;
a mixing stirrer is arranged in the coagulation lattice, the flocculation area comprises a first-stage flocculation lattice and a second-stage flocculation lattice, and a first flocculation stirrer and a second flocculation stirrer are respectively arranged in the first-stage flocculation lattice and the second-stage flocculation lattice;
the coagulation check, one-level flocculation check, second grade flocculation check arrange in proper order and coagulate and be provided with the first water hole of crossing between check and the one-level flocculation check, it crosses the water hole to be provided with the second between one-level flocculation check and the second grade flocculation check.
Preferably, the number of the concrete lattices is one or more;
the number of the primary flocculation lattices is one or more;
the number of the secondary flocculation lattices is one or more.
Preferably, the mixing stirrer adopts an axial flow stirrer;
the first flocculation stirrer and the second flocculation stirrer adopt impeller stirrers;
the depth of the coagulation lattice, the primary flocculation lattice and the secondary flocculation lattice is not more than 4 m;
the first water passing hole and the second water passing hole are arranged at different heights.
Preferably, the backwashing wastewater backflow system comprises a backwashing wastewater adjusting tank, a backwashing water backflow pump, a backwashing water residual pump and a backflow pipe;
the backwashing water reflux pump pumps the wastewater in the backwashing wastewater regulating tank into the coagulation lattice through the reflux pipe, and the tail end of the reflux pipe extends to the lower part of the mixing stirrer;
a wastewater stirrer is arranged in the backwashing wastewater regulating tank, and the backwashing water residual pump is connected with a plant area drainage pipe network through a pipeline;
the waste water backflow amount of the coagulation lattice is 2% -4%.
Preferably, an MLSS detector, a first ultrasonic liquid level meter and an alarm are arranged in the backwashing wastewater adjusting tank;
the MLSS detector, the first ultrasonic liquid level meter and the alarm are respectively in signal connection with the control device;
and an overflow port is arranged at the upper part of the backwashing wastewater regulating tank.
Preferably, the filter chamber is provided with an inlet channel, a plurality of water distribution channels, a filtering area, a water collecting system and a water production channel;
a third water passing hole is formed between the water inlet channel and the secondary flocculation grid, a valve is arranged between the water inlet channel and the water distribution channel, a V-shaped groove is formed between the water distribution channel and the filtering area, and sweeping and washing hole cloth is arranged on the V-shaped groove;
water sequentially passes through the third water passing hole, the water inlet channel, the valve and the water distribution channel and enters the filtering area through the V-shaped groove;
the filter area is internally provided with a filter bed, the filter material is arranged on the filter bed, the water collecting system is internally provided with a water producing channel, and water passing through the filter material is collected to the water collecting system and then enters the water producing channel.
Preferably, a second ultrasonic liquid level meter and a water loss instrument are arranged in the filter tank;
and the control device is in signal connection with the second ultrasonic liquid level meter and the water loss instrument respectively.
Preferably, the turbidity value of the raw water is obtained by a first turbidity meter, and the coagulant and the denitrifier with corresponding amounts are added into the tubular static mixer according to the obtained turbidity value and the volume of the added raw water, mixed with the raw water and then enter a coagulation grid;
the filter backwashing wastewater is output from the backwashing wastewater backflow system, the coagulant aid PAM and the filter backwashing wastewater are added into the coagulation lattice and are stirred by the mixing stirrer, suspended matters in the raw water are destabilized, collided and coagulated to form alum flocs under the combined action of the coagulant aid PAM and the suspended matters in the filter backwashing wastewater, and then the alum flocs enter the filter to be contacted, filtered and adsorbed so as to remove the suspended matters in the water.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention solves the problem of low-temperature and low-turbidity water treatment by adopting the tubular static mixer, the mixing flocculation tank, the filter tank and the backwashing wastewater backflow system, realizes high-efficiency and energy-saving backflow of part of backwashing wastewater, enables micro suspended matters in raw water to be fully flocculated to form fine floccules, and directly filters and removes the fine floccules through the filter tank to achieve the purpose of purifying water quality.
2. According to the invention, backwashing is carried out by water inlet of the backwashing water pipe and/or air inlet of the backwashing air pipe, waste gas is discharged to air, and backwashing wastewater enters the backwashing water regulating tank for reuse, so that the problem of recycling of filter materials is solved, the consumption of raw water is saved, the operation efficiency of the device is improved, and the device is strong in practicability.
3. According to the invention, the orifice plate is arranged at the inlet end of the tubular static mixer, the plurality of helical blades and the arrangement structure of the helical blades are arranged in the tubular static mixer, so that the uniform mixing of the medicament in the raw water and the raw water is greatly improved, the structural design is ingenious, and the practicability is strong.
4. The backwashing wastewater is sent to the coagulation grid by the backwashing water reflux pump, the concentration of raw water suspended solids is increased by conveying the backwashing wastewater through the arranged reflux pipe, the probability of particle contact and collision is increased, more importantly, the medicament fully plays a bridging role to form a flocculating constituent, and the flocculating constituent is removed by filtration, so that the waste amount of the backwashing wastewater is reduced, the raw water is utilized to a greater extent, the raw water consumption of tap water per unit of output is reduced, the waste of water resources is reduced, the operation is simple, and the operation state is stable.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic side cross-sectional view of a hybrid flocculation basin;
FIG. 3 is a schematic side sectional view of a backwash wastewater conditioning tank;
fig. 4 is a schematic top view of the present invention.
The figures show that:
filter material 6 back flushing water reflux pump 12 of tube type static mixer 1
Back washing water residual pump 13 of back washing water regulating tank 7 of coagulation grid 2
Backflow pipe 14 of first-stage flocculation grid 3 mixing stirrer 8
Secondary flocculation grid 4 first flocculation stirrer 9 reflux valve 15
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
The invention provides a backwashing wastewater backflow flocculation filtration device, which comprises a water inlet pipe, a tubular static mixer 1, a mixed flocculation tank, a filter tank, a backwashing wastewater backflow system, a water outlet pipe, a backwashing device and a control device, wherein raw water sequentially passes through the water inlet pipe, the tubular static mixer 1, the mixed flocculation tank and the filter tank and then purified water is output from the water outlet pipe; a drainage channel and a filtering area 5 are arranged in the filter pool, a filter material 6 is arranged in the filtering area 5, the backwashing device can remove filter matters in the filter material 6 through water discharge and/or air discharge to form wastewater, the wastewater enters the drainage channel, and the wastewater in the drainage channel enters a backwashing wastewater backflow system and is finally conveyed to the mixed flocculation pool; the water inlet pipe is provided with a first turbidity meter, the water outlet pipe is provided with a second turbidity meter, the first turbidity meter, the second turbidity meter, the backwashing wastewater backflow system and the backwashing device are respectively in signal connection with the control device, wherein the signal connection can be realized in a cable-passing mode or a wireless mode, and the specific application is reasonably selected according to the actual situation. The turbidity information of the quality of water that first turbidity appearance, second turbidity appearance detected is carried for controlling means, and controlling means gives back flush waste water reflux system according to the information output control command that receives, simultaneously according to the business turn over water turbidity adjustment dosage that first turbidity appearance, second turbidity appearance detected, and thoughtlessly congeal to be provided with sample valve 16 on the check 2, can regularly detect the flocculation effect of mixing the flocculation basin.
Specifically, an orifice plate is arranged at the inlet end of the tubular static mixer 1, and a plurality of orifices are arranged on the orifice plate, in a preferred embodiment, the diameter of each orifice is 20 mm, and the orifice plate is used for blocking large-particle impurities in raw water, a plurality of helical blades are arranged inside the tubular static mixer 1, the helical blades are of a 180-degree twisted structure, and every two adjacent helical blades are opposite in rotation direction and arranged at an included angle of 90 degrees.
Further, as shown in fig. 1, a plurality of dosing holes are arranged on the tubular static mixer 1, in a preferred example, the number of the dosing holes is 3, one dosing hole is used for dosing a coagulant, the coagulant is PAC, namely polyaluminium chloride, the dosing amount of PAC is 5-15mg/L, 1 dosing hole is used for adding sodium hypochlorite to remove ammonia nitrogen, and 1 hole is reserved for standby. The tubular static mixer 1 is connected with the concrete grid 2 through a pipeline.
Specifically, as shown in fig. 1-4, the mixed flocculation tank comprises a coagulation grid 2 and a flocculation area; a mixing stirrer 8 is arranged in the coagulation lattice 2, the flocculation area comprises a first-stage flocculation lattice 3 and a second-stage flocculation lattice 4, and a first flocculation stirrer 9 and a second flocculation stirrer 10 are respectively arranged in the first-stage flocculation lattice 3 and the second-stage flocculation lattice 4; it arranges in proper order and thoughtlessly congeals and is provided with the first water hole of crossing between check 2 and the one-level flocculation check 3 to congeal check 2, one-level flocculation check 3, second grade flocculation check 4, it crosses the water hole to be provided with the second between one-level flocculation check 3 and the second grade flocculation check 4, wherein, in a preferred example, the first water hole of crossing, the second is crossed the water hole and is set up at the height of difference, avoids the water conservancy short stream.
Specifically, as shown in fig. 1, the number of the concrete grids 2 is one or more; the number of the primary flocculation lattices 3 is one or more; the number of the secondary flocculation lattices 4 is one or more.
Specifically, as shown in fig. 1 to 4, in a preferred embodiment, the mixing stirrer 8 is a top-mounted high-efficiency axial flow stirrer, the coagulation time is 1 to 1.5min, and the first flocculation stirrer 9 and the second flocculation stirrer 10 are vertical-shaft type constant-diameter impeller stirrers, wherein the stirring impellers of the vertical-shaft type constant-diameter impeller stirrers are arranged at the water depth 1/2 of the primary flocculation lattice 3 and the secondary flocculation lattice 4; the linear velocity of the central point of the radius of the impeller of the first flocculation stirrer 9 is 0.3m/s, and the coagulation time is 1-2 min; the linear velocity of the central point of the radius of the impeller of the second flocculation stirrer 10 is 0.2m/s, and the coagulation time is 1-2 min; the depth of the coagulation grid 2, the first-stage flocculation grid 3 and the second-stage flocculation grid 4 is not more than 4 m;
specifically, as shown in fig. 1 to 4, the backwash wastewater return system includes a backwash wastewater adjustment tank 7, a backwash water return pump 12, a backwash water residual pump 13, and a return pipe 14; the backwashing water reflux pump 12 pumps the wastewater in the backwashing wastewater regulating tank 7 into the concrete lattice 2 through a reflux pipe 14, the tail end of the reflux pipe 14 extends to the lower part of the mixing stirrer 8, and a reflux valve 15 is arranged on the reflux pipe 14; the back washing water residual pump 13 is connected with a plant area drainage pipe network through a pipeline; the waste water backflow amount of the coagulation grid 2 is 2% -4%. In a preferred embodiment, the backwashing wastewater regulating tank 7 is used for preventing sedimentation in the tank, a wastewater stirrer is arranged in the backwashing wastewater regulating tank 7, and the wastewater stirrer is closed when the liquid level is lower than the protective liquid level of the wastewater stirrer. 3 backwashing water reflux pumps 12 are arranged in the pond, 1 device is used for 2, 2 backwashing water reflux pumps 12 are arranged to the coagulation grid 2 through a reflux pipeline and a valve, 1 backwashing water residual pump 13 is used for delivering residual wastewater to a plant drainage pipe network, and the refluxing wastewater and the discharged wastewater share one standby pump. Refluxing the backwashing wastewater constantly, and stopping the pump when the liquid level is low; and (4) returning the pump 12 by the residual backwashing water, starting the pump at a middle liquid level, stopping the pump at a middle liquid level, alarming when the liquid level of the backwashing wastewater tank is high, and overflowing when the liquid level is exceeded.
Specifically, the backwashing wastewater regulating tank 7 is provided with an MLSS (mixed liquid suspended solids) detector, a first ultrasonic liquid level meter and an alarm, wherein the MLSS (mixed liquid suspended solids) refers to the concentration of suspended solids of mixed liquid, specifically to the amount of suspended solids of mixed liquid obtained by mixing sewage and activated sludge in an aeration tank, and the unit is mg/L, which is an index for measuring the amount of activated sludge in the aeration tank, and the MLSS (mixed liquid suspended solids) is often used as an index for roughly measuring the microbial biomass of the activated sludge due to simple and convenient measurement; the MLSS detector, the first ultrasonic liquid level meter and the alarm are respectively in signal connection with the control device; and an overflow port is arranged at the upper part of the backwashing wastewater regulating tank 7.
Specifically, as shown in fig. 1 to 4, an inlet channel, a plurality of distribution channels, a filtering area 5, a water collecting system and a water producing channel are arranged in the filter chamber; a third water passing hole is formed between the water inlet channel and the secondary flocculation grid 4, a valve is arranged between the water inlet channel and the water distribution channel, the valve preferably adopts a pneumatic gate valve, a V-shaped groove is formed between the water distribution channel and the filtering area 5, and hole sweeping and washing cloth is arranged on the V-shaped groove; water sequentially passes through the third water passing hole, the water inlet channel, the valve and the water distribution channel and enters the filtering area 5 through the V-shaped groove; a filter bed is arranged in the filter area 5, a filter material 6 is arranged on the filter bed, a water production channel is arranged in the water collecting system, and water passing through the filter material 6 is collected to the water collecting system and then enters the water production channel.
Specifically, a second ultrasonic liquid level meter and a water loss instrument are arranged in the filter tank; and the control device is in signal connection with the second ultrasonic liquid level meter and the water loss instrument respectively. Specifically, a turbidity value of raw water is obtained by a first turbidity meter, and a corresponding amount of coagulant and denitrifier are added into a tubular static mixer 1 according to the obtained turbidity value and the volume of the added raw water, mixed with the raw water and then fed into a coagulation grid 2; the filter backwashing wastewater is output from the backwashing wastewater backflow system, a coagulant aid PAM and the filter backwashing wastewater are added into the coagulation grid 2 and are stirred by the mixing stirrer 8, wherein the PAM is short for polyacrylamide, and the polyacrylamide and derivatives thereof can be used as effective flocculating agents; on one hand, when PAM is used for flocculation, the PAM is related to the zeta potential of the surface of flocculated species, viscosity, turbidity and pH value of suspension, and when the zeta potential of the particle surface is the reason of particle aggregation resistance, PAM with opposite surface charges is added to reduce the zeta potential and coagulate the particles; on the other hand, the chains of PAM molecules are immobilized on the surface of different particles, and polymer bridges are formed between the particles, so that the particles form aggregates and settle. Under the combined action of a coagulant aid PAM and suspended matters in the backwashing wastewater of the filter, suspended matters in raw water are destabilized, collided and coagulated to form alum flocs, and then the alum flocs enter the filter to be contacted, filtered and adsorbed so as to remove the suspended matters in the water.
Further, a coagulant aid PAM is added into the coagulation grid 2, and in a preferred embodiment, the adding amount of the PAM is controlled to be 0.3mg/L, so that the flocculation effect is ensured, and the subsequent V-shaped groove is prevented from being blocked.
Furthermore, in a preferred embodiment, the filtering zones 5 in the single-seat filter are divided into 2 groups, wherein the thickness of a concrete filter plate is 0.1m, the thickness of a bearing layer is 0.1m, the height of a filtering material layer is 1.2m, and the filter adopts a double-layer filtering material 6: the upper layer 50cm of anthracite with the grain size range of 1.5-2.0 mm; the grain size of the lower layer 70cm of homogeneous quartz sand ranges from 0.95 mm to 1.35mm, the uneven coefficient is less than or equal to 1.2, the filtration speed is 5.5 m/h to 6.5m/h, the forced filtration speed is less than 8m/h, and a partition is arranged between the filter pool and the back flush wastewater pool. The water and gas distribution system of the filter tank adopts a long-handle filter head and a filter plate for gas distribution.
The working principle of the invention is as follows:
the low-temperature and low-turbidity water enters a tubular static mixer 1 through a water inlet pipe, a dosing hole is reserved on the tubular static mixer 1, a coagulant and a denitrifier are added into the tubular static mixer 1 through the dosing hole, raw water is fully contacted and mixed with the reagents through the disturbance of a plurality of helical blades arranged in the tubular static mixer 1 at a certain rotating speed, the raw water enters a mixing flocculation tank, coagulant aid PAM and filter backwash wastewater are added into a coagulation grid 2, the wastewater in a backwash wastewater adjusting tank 7 is pumped into the coagulation grid 2 through a backflow pipe 14 through the stirring of a mixing stirrer 8 and a backwash water backflow pump 12, the suspended matters in the raw water are destabilized, collided and coagulated under the combined action of the coagulant aid and the higher-concentration suspended matters in the backwash wastewater, and the suspended matters in the raw water are stirred by the mixing stirrer 8, a first flocculation stirrer 9 and a second flocculation stirrer 10 to form fine alum flocs, then, the water enters the water inlet channel in the filter through the third water passing hole, and respectively enters the water distribution channel through the plurality of arranged pneumatic gate valves, and then enters the filtering area 5 through the V-shaped groove, so that the water is contacted, filtered and adsorbed in the filter, and suspended matters in the water are removed. The ultrasonic level meter and the water loss meter in the filtering area 5 detect the running state in the filter tank in real time, when the resistance of the filter material 6 exceeds a set value, the control device controls the filter tank to start back flushing, backwashing is carried out by water inlet of a backwashing water pipe and air inlet of a backwashing air pipe, waste gas is discharged to air, backwashing wastewater enters a backwashing water regulating tank 7, backwashing wastewater is sent to a coagulation grid 2 by a backwashing water reflux pump 12, residual wastewater is discharged to a plant drainage pipe network by a backwashing water residual pump 13, carry backwash waste water through the back flow 14 that sets up to increase the concentration of raw water suspended solid, increase the probability of granule contact, collision, more importantly makes the effect that the medicament fully played the bridging, goes into the flocculating constituent, is got rid of through filtering, and who filters through filtering area 5 finally enters into the product canal behind the water collecting system through the outlet pipe, and the water in the product canal is to the clean water basin through producing the water main.
When the single-tank head loss of the filtering area 5 is too large or the turbidity exceeds a preset value, the control device controls to automatically start a backwashing program. The backwashing sequence is air washing, air water washing or water washing, the backwashing time is estimated to be 12min, the backwashing drainage pneumatic gate valve is closed after backwashing, when the water surface rises to the water depth 1m above the filter material 6, the water pneumatic butterfly valve is produced, and the filter tank resumes the filtering operation again.
The invention combines the carrier technology with the flocculation and filtration adsorption technology, adjusts the reflux quantity of the wastewater, the dosage of the coagulant, the dosage of the flocculant, the GT value of the flocculation, the filter material of the filter, the backwashing strength and the backwashing time, improves the flocculation effect of the low-temperature and low-turbidity water, and can ensure that the low-temperature and low-turbidity water can meet the requirement of treating the effluent of the raw water under the condition of not using a sedimentation tank and the dosage of the flocculant is lower than that of a sedimentation method.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. A backwashing wastewater backflow flocculation filtration device is characterized by comprising a water inlet pipe, a tubular static mixer (1), a mixing flocculation tank, a filter tank, a backwashing wastewater backflow system, a water outlet pipe, a backwashing device and a control device;
raw water passes through the water inlet pipe, the tubular static mixer (1), the mixing flocculation tank and the filter tank in sequence and then is output from the water outlet pipe;
a drainage channel and a filtering area (5) are arranged in the filter tank, a filter material (6) is arranged in the filtering area (5), the backwashing device can remove filter matters in the filter material (6) through water discharge and/or air discharge to form wastewater, the wastewater enters the drainage channel, and the wastewater in the drainage channel enters a backwashing wastewater backflow system and is finally conveyed into the mixed flocculation tank;
a first turbidity meter is arranged on the water inlet pipe, and a second turbidity meter is arranged on the water outlet pipe;
the first turbidity meter, the second turbidity meter, the backwashing wastewater backflow system and the backwashing device are respectively in signal connection with the control device.
2. The backwashing wastewater reflux flocculation filtration device of claim 1, wherein an orifice plate is arranged at an inlet end of the tubular static mixer (1), a plurality of helical blades are arranged inside the tubular static mixer (1), and a plurality of dosing holes are arranged on the tubular static mixer (1);
the helical blades are of a 180-degree twisted structure, and every two adjacent helical blades are opposite in rotating direction and arranged at an included angle of 90 degrees.
3. The backwashing wastewater reflux flocculation filtration device of claim 1, wherein the mixing flocculation tank comprises a coagulation lattice (2) and a flocculation zone;
a mixing stirrer (8) is arranged in the coagulation lattice (2), the flocculation area comprises a first-stage flocculation lattice (3) and a second-stage flocculation lattice (4), wherein a first flocculation stirrer (9) and a second flocculation stirrer (10) are respectively arranged in the first-stage flocculation lattice (3) and the second-stage flocculation lattice (4);
the coagulation lattice (2), the one-level flocculation lattice (3) and the second-level flocculation lattice (4) are sequentially arranged, a first water passing hole is formed between the coagulation lattice (2) and the one-level flocculation lattice (3), and a second water passing hole is formed between the one-level flocculation lattice (3) and the second-level flocculation lattice (4).
4. The backwashing wastewater reflux flocculation filtration device of claim 3, wherein the number of the coagulation lattices (2) is one or more;
the number of the primary flocculation lattices (3) is one or more;
the number of the secondary flocculation lattices (4) is one or more.
5. The backwash wastewater reflux flocculation filtration device according to claim 3, wherein the mixing agitator (8) employs an axial flow type agitator;
the first flocculation stirrer (9) and the second flocculation stirrer (10) both adopt impeller stirrers;
the pool depths of the coagulation lattice (2), the primary flocculation lattice (3) and the secondary flocculation lattice (4) are not more than 4 m;
the first water passing hole and the second water passing hole are arranged at different heights.
6. The backwash wastewater reflux flocculation filter apparatus as defined in claim 3, wherein said backwash wastewater reflux system comprises a backwash wastewater conditioning tank (7), a backwash water reflux pump (12), a backwash water residual pump (13) and a reflux pipe (14);
the backwashing water reflux pump (12) pumps the wastewater in the backwashing wastewater adjusting tank (7) into the coagulation lattice (2) through the reflux pipe (14), and the tail end of the reflux pipe (14) extends to the lower part of the mixing stirrer (8);
a wastewater stirrer is arranged in the backwashing wastewater regulating tank (7), and the backwashing water residual pump (13) is connected with a plant area drainage pipe network through a pipeline;
the waste water backflow amount of the coagulation grid (2) is 2% -4%.
7. The backwashing wastewater reflux flocculation and filtration device of claim 6, wherein an MLSS detector, a first ultrasonic liquid level meter and an alarm are arranged in the backwashing wastewater adjusting tank (7);
the MLSS detector, the first ultrasonic liquid level meter and the alarm are respectively in signal connection with the control device;
and an overflow port is arranged at the upper part of the backwashing wastewater regulating tank (7).
8. The backwashing wastewater reflux flocculation filter of claim 3 wherein an inlet channel, a plurality of distribution channels, a water collection system, and a product channel are provided in the filter;
a third water passing hole is formed between the water inlet channel and the secondary flocculation grid (4), a valve is arranged between the water inlet channel and the water distribution channel, a V-shaped groove is formed between the water distribution channel and the filtering area (5), and sweeping and washing hole cloth is arranged on the V-shaped groove;
water sequentially passes through the third water passing hole, the water inlet channel, the valve and the water distribution channel and enters the filtering area (5) through the V-shaped groove;
a filter bed is arranged in the filter area (5), the filter material (6) is arranged on the filter bed, a water production channel is arranged in the water collection system, and water passing through the filter material (6) is collected to the water collection system and then enters the water production channel.
9. The backwash wastewater reflux flocculation filtration device of claim 8, wherein a second ultrasonic level meter and a water loss meter are arranged in the filter;
and the control device is in signal connection with the second ultrasonic liquid level meter and the water loss instrument respectively.
10. The backwash wastewater reflux flocculation filtration device according to claim 6, wherein a turbidity value of raw water is obtained by a first turbidity meter, and a corresponding amount of coagulant and denitrifier are added into the tubular static mixer (1) according to the obtained turbidity value and the volume of the added raw water, mixed with the raw water, and then fed into the coagulation grid (2);
the filter backwashing wastewater is output from the backwashing wastewater backflow system, coagulant aid PAM and the filter backwashing wastewater are added into the coagulation lattice (2) and are stirred by the mixing stirrer (8), suspended matters in raw water are destabilized, collided and coagulated to form alum flocs under the combined action of the coagulant aid PAM and the suspended matters in the filter backwashing wastewater, and then the alum flocs enter the filter to be contacted, filtered and adsorbed so as to remove the suspended matters in the water.
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