CN108996740A - A kind of just rain processing system and method - Google Patents

Abstract

The present invention relates to a kind of just rain processing system and method, system includes deslagging device, rotational flow sand sinking device and reaction settler, and deslagging device, rotational flow sand sinking device are sequentially connected to reaction settler；First rain, which enters deslagging device, to carry out except Slag treatment, and it is passed through into rotational flow sand sinking device and carries out sediment by rotational flow processing, it is passed through again into reaction settler, and composite flocculation agent is added in reaction settler and forms mixed liquor, mud-water separation is carried out after being uniformly mixed to mixed liquor, sludge and clear water are obtained, and by clear water outlet, sludge outward transport is handled.The present invention can preferably remove ss suspended solid, total phosphorus TP just in the rain, COD COD and nitrogen pool TN just in the rain can be effectively reduced, and can satisfy the service requirement of intermittent duty, and starting is fast, and anti impulsion load is high.First rain processing system of the invention, takes up little area, and cost is relatively low, detersive efficiency is high, and plant maintenance is simple, long service life, without air blower and aerator etc., energy saving.

Description

A first rain treatment system and method

technical field

The invention relates to the technical field of sewage treatment, in particular to a primary rain treatment system and method.

Background technique

At present, no effective and systematic control measures have been taken for urban surface runoff pollution caused by rainwater at the initial stage of diversion system. Urban rainwater runoff is one of the main reasons for the deterioration of the receiving water environment. Urban rainwater runoff carries many types and large quantities of pollutants, which seriously affects the water quality of the receiving water body. The first flushing pollution of storm runoff is the focus of water environment management. The study found that the first 6-8mm of rainfall carried more than 60% of pollutants, and the first 10mm of rainfall carried 80% of pollutants. The initial rainwater pollution was serious, but the concentration of pollutants was high, and the concentration of pollutants in natural rainfall and different underlying surfaces varied greatly in different time periods. The research results on the correlation between pollutants show that COD, TN, TP and SS have a good correlation, and the correlation coefficient between COD and SS is above 0.9.

Due to the limitation of project investment and the actual situation that there is no charging standard for initial rain treatment, and my country's sewage treatment facilities are still relatively lacking. At present, it is still committed to urban sewage treatment. Sand tanks are discharged after treatment, which removes less pollutants, and only a few places start to treat the combined sewage in the rainy season. The treatment process is also very different due to the different treatment purposes and effluent standards. In a broad sense, the treatment includes phosphorus removal, nitrogen removal, SS, organic matter removal, etc. However, due to the time limit of the intercepted sewage in the rainy season, there are not many days in a year. If it is built according to the urban sewage treatment process, there will be problems such as low utilization rate of facilities and complicated operation and management. Therefore, generally speaking, the treatment of intercepted sewage in the rainy season is mainly based on physical and chemical methods.

Contents of the invention

The technical problem to be solved by the present invention is to provide a system and method for early rain treatment in view of the above-mentioned deficiencies in the prior art.

The technical scheme of the present invention to solve the above-mentioned technical problems is as follows: a first rain treatment system, comprising a slag removal device, a swirl grit settling device and a reaction sedimentation device, the slag removal device, a swirl flow grit settling device and a reaction sedimentation device are sequentially connected;

After the initial rain enters the slag removal device, the slag removal device performs slag removal treatment on the initial rain, and passes the slag removal treated primary rain into the cyclone sand settling device through the pipeline. The cyclone grit settling device performs cyclone grit settling treatment on the primary rain, and the primary rain treated by the cyclone grit settling is passed into the reaction sedimentation device through the pipeline, and the composite flocculant is added into the reaction sedimentation device A mixed liquid is formed, the mixed liquid is stirred and mixed evenly, and then the mud and water are separated to obtain sludge and clean water, and the clean water is discharged outside, and the sludge is transported outside for treatment.

The beneficial effects of the present invention are: the initial rain treatment system of the present invention can better remove the suspended matter SS and total phosphorus TP in the initial rain, can effectively reduce the chemical oxygen demand COD and the total nitrogen content TN in the initial rain, and can Meet the operation requirements of intermittent operation, fast start-up, high impact load resistance. The primary rain treatment system of the present invention has the advantages of small land occupation, low cost, high decontamination efficiency, simple equipment maintenance, long service life, no blower and aeration device, etc., saving energy consumption.

On the basis of above-mentioned technical scheme, the present invention can also be improved as follows:

Further: the slag removal device includes a water distribution channel, a first grid pool, a water pump forebay, an outlet pool and a second grid pool, and the water distribution channel, the first grid pool, a water pump forebay, an outlet pool and the second The grid pools are arranged adjacently in sequence, and the distribution channel, the first grid pool, the water pump forebay, the outlet pool and the second grid pool are connected in sequence;

The coarse grid decontamination machine is set outside the first grid pool, and the decontamination grid of the coarse grid decontamination machine extends from the upper port of the first grid pool to the second grid pool. In a grid pool, a lift pump is provided at the bottom of the water pump forebay, and the water outlet of the lift pump communicates with the water outlet pool through a pipeline, and a fine grid decontamination machine is provided in the second grid pool, and One end of the frame provided with the fine grid decontamination machine protrudes upwards from the second grid pool, and the second grid pool communicates with the cyclone sand settling device.

The beneficial effect of the above-mentioned further scheme is: through the first grid pool, the coarser suspended matter in the initial rain can be preliminarily removed, and the debris with a larger diameter can be intercepted, so as to ensure the normal operation of the follow-up treatment facilities, and the initial slag removal treatment The primary rain enters the forebay of the water pump, is transferred to the outlet pool by the lift pump, and overflows into the second grid pool, through which the larger floating objects in the primary rain can be removed twice, Such as filamentous and ribbon-shaped floating objects, to protect the normal operation of subsequent processing equipment.

Further: the side wall of the distribution channel close to the first grid pool is provided with a first water outlet that communicates with the first grid pool, and the first grid pool is close to the water pump forebay The side wall on one side is provided with a second water outlet communicating with the water pump forebay, and the side wall of the outlet pool close to the second grid pool is provided with a water outlet communicating with the second grid pool. The overflow port of the second grid pool is provided with a third water outlet connected to the cyclone grit settling device on the side wall of the second grid pool away from the water outlet pool, the first water outlet, the second outlet The water port, the overflow port and the third water outlet are all provided with valves for opening or closing the corresponding water flow channels.

The beneficial effect of the above further solution is: by setting the valve at the position of the corresponding water flow channel, the corresponding water flow channel can be opened or closed conveniently, the water level in different devices can be adjusted conveniently, and the various components in the system can also be easily repaired, improving Maintenance efficiency.

Further: the swirl grit settling device includes a hollow cylindrical swirl grit chamber, the top wall of the swirl grit chamber is hung with a central cylinder that penetrates up and down, and the lower end of the central cylinder is in the shape of an inverted cone. One side wall of the cyclone grit chamber is provided with a water inlet along the tangential direction, and the first rain after the slag removal process enters the cyclone grit chamber from the water inlet and then passes through the cyclone. A swirling flow is formed along the wall of the grit chamber, and the gravel in the initial rain settles into the sand bucket at the bottom of the swirl grit chamber, and the primary rain enters through the pipe from the fourth outlet at the top of the swirl grit chamber In the reaction sedimentation device, at least one sand lifting pump is provided at the bottom of the central cylinder for transferring the gravel in the sand hopper to the outside of the swirling flow grit chamber through the diversion cylinder passing through the central cylinder.

The beneficial effect of the above further scheme is: by passing the slag removal treatment by the slag removal device into the tangential direction of the vortex grit chamber, the initial rain falls in the tangential direction of the vortex grit chamber. A downward swirling flow is formed in the swirling flow grit chamber and descends to the lower end of the central cylinder, and an upward swirling flow is formed around the central cylinder. The water velocity at the junction of the downward swirling flow and the upward swirling flow is is zero, the gravel in this area will settle into the sand bucket at the bottom of the cyclone grit chamber due to gravity, and be transferred to the outside of the cyclone grit chamber through the lift pump to complete the grit treatment of the initial rain.

Further: the cyclone grit settling device also includes an annular flow guide, which is arranged at the bottom of the cyclone grit chamber, and the outer edge of the flow guide is in contact with the cyclone sink. The inner walls of the sand tank are connected, and the outer edge of the flow guide is higher than the inner edge, and the sand lifting pump is located in the central hole of the flow guide.

The beneficial effect of the above further solution is that the grit in the initial rain can be facilitated to settle down to the bottom of the swirl grit chamber through the guide member and then smoothly enter the central hole of the guide member, thereby facilitating the lift pump to settle The gravel is transferred to the outside of the cyclone settling tank, so that the gravel in the first rain can be completely separated from the rainwater.

Further: the reaction sedimentation device includes a reaction tank and a sedimentation tank, the side wall of the reaction tank near the sedimentation tank is provided with a first water hole communicating with the sedimentation tank;

The top of the reaction tank is provided with a stirrer for stirring the mixed solution, a support is provided in the upper port of the sedimentation tank, a mud scraper is suspended on the support, and the lower end of the mud scraper is Set at the bottom of the sedimentation tank, the upper part of the sedimentation tank is provided with an inclined pipe for separating the muddy water from the incoming mixed solution, and a sump is arranged above the inclined pipe, and the clear water separated from the muddy water is discharged from the sump Outward row, the bottom of the sedimentation tank is provided with a mud bucket, and the lower end of the mud scraper is located above the mud bucket, and scrapes the sludge separated from mud and water into the mud bucket.

The beneficial effect of the above further scheme is: the first rain forms a mixed solution after chemical reaction with the added composite flocculant in the reaction tank and enters the sedimentation tank, and the mixed solution is separated from mud and water by the inclined tube to obtain Sludge and clean water, the sludge settles to the bottom of the sedimentation tank and is scraped into the mud hopper by the scraper, and the clean water is discharged from the sump to realize efficient removal of initial rain pollution treatment.

Further: the number of the reaction pools is multiple, and the multiple reaction pools are connected in sequence, the reaction pools of the first stage are connected with the cyclone grit settling device through pipelines, and the reaction pools of the last stage are connected through pipelines. The pipeline communicates with the sedimentation tank.

The beneficial effect of the above further solution is that the initial rain and the composite flocculant can react more fully through multiple reaction pools, which facilitates more efficient removal of dirt in the initial rain and achieves a higher decontamination effect.

Further: the bottom surface of the sedimentation tank is set in a downward depression, and the edge of the bottom surface of the sedimentation tank is higher than the middle position of the bottom surface, and the mud bucket is located at the center position of the bottom surface.

The beneficial effect of the above further solution is that: through this structure, the sludge formed by the settlement of the mixed liquid can smoothly enter the lower end of the mud scraper and smoothly enter the mud bucket.

Further: the sedimentation tank is provided with a deflector for guiding the incoming mixed solution to the lower end of the mud scraper, and the deflector is arranged on a side of the sedimentation tank close to the reaction tank.

The beneficial effect of the above further solution is: the mixed liquid entering the sedimentation tank can be guided to the lower end of the mud scraper through the deflector, so that the mixed liquid settles the sludge formed at the lower end of the mud scraper , and is scraped into the mud hopper.

The present invention also provides a method for treating initial rain, which adopts the described first rain treatment system, and the method comprises the following steps:

Step 1: using the slag removal device to remove slag from the first rain;

Step 2: Pass the primary rain treated by slag removal into the cyclone grit settling device, and carry out the cyclone grit settling treatment;

Step 3: Pass the primary rain treated by cyclone dust into the reaction sedimentation tank, and add a composite flocculant to form the mixed solution, and stir the mixed solution evenly before separating the mud and water to obtain sludge and clean water, and drain the clean water outside, and transport the sludge out for treatment.

The initial rain treatment method of the present invention can better remove the suspended matter SS and total phosphorus TP in the initial rain, can effectively reduce the chemical oxygen demand COD and the total nitrogen content TN in the initial rain, and can meet the operation requirements of intermittent operation, Fast start-up and high shock load resistance. The primary rain treatment system of the present invention has the advantages of small land occupation, low cost, high decontamination efficiency, simple equipment maintenance, long service life, no blower and aeration device, etc., saving energy consumption.

Description of drawings

Fig. 1 is a schematic structural view of a slag removal device of the present invention;

Fig. 2 is a schematic structural view of the swirl sand settling device of the present invention;

Fig. 3 is a schematic structural diagram of the reaction precipitation device of the present invention.

In the accompanying drawings, the list of parts represented by each label is as follows:

11. Water distribution channel, 12. The first grid tank, 13. The pump front tank, 14. Outlet tank, 15. The second grid tank, 16. Valve, 21. Swirling flow grit chamber, 22. Center tube, 23 , sand lifting pump, 24, flow guide, 31, reaction tank, 32, sedimentation tank;

121. Coarse grid decontamination machine, 131. Lifting pump, 151. Fine grid decontamination machine, 311. Mixer, 321. Support member, 322. Mud scraper, 323. Mud bucket, 324. Inclined pipe, 325. Sump, 326, deflector.

Detailed ways

The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

A primary rain treatment system includes a slag removal device, a cyclone sand settling device and a reaction sedimentation device, and the slag removal device, the cyclone sand sedimentation device and the reaction sedimentation device are connected in sequence.

After the initial rain enters the slag removal device, the slag removal device performs slag removal treatment on the initial rain, and passes the slag removal treated primary rain into the cyclone sand settling device through the pipeline. The cyclone grit settling device performs cyclone grit settling treatment on the primary rain, and the primary rain treated by the cyclone grit settling is passed into the reaction sedimentation device through the pipeline, and the composite flocculant is added into the reaction sedimentation device The mixed solution is formed, the mixed solution is stirred and mixed evenly, and then the mud and water are separated to obtain sludge and clean water, and the clear water is discharged outside, and the sludge is transported outside for treatment.

The primary rain treatment system of the present invention can better remove the suspended matter SS and total phosphorus TP in the primary rain, can effectively reduce the chemical oxygen demand COD and the total nitrogen TN in the primary rain, and can meet the operation requirements of intermittent operation, Fast start-up and high shock load resistance. The primary rain treatment system of the present invention has the advantages of small land occupation, low cost, high decontamination efficiency, simple equipment maintenance, long service life, no blower and aeration device, etc., saving energy consumption.

As shown in Figure 1, in one embodiment of the present invention, the slag removal device includes a water distribution channel 11, a first grid pool 12, a water pump forebay 13, an outlet pool 14 and a second grid pool 15, the distribution channel The water channel 11, the first grid pool 12, the water pump front pool 13, the water outlet pool 14 and the second grid pool 15 are arranged adjacently in sequence, and the water distribution channel 11, the first grid pool 12, the water pump front pool 13, and the water outlet pool 14 communicates with the second grid pool 15 in sequence.

The coarse grid decontamination machine 121 is arranged outside the first grid pool 12, and the decontamination grid of the coarse grid decontamination machine 121 extends into the upper port of the first grid pool 12. In the first grid pool 12, a lift pump 131 is provided at the bottom of the water pump front pool 13, and the water outlet end of the lift pump 131 communicates with the water outlet pool 14 through a pipeline, and the second grid pool 15 is provided with a fine grid decontamination machine 151, and one end of the frame on the fine grid decontamination machine 151 protrudes upwards from the second grid pool 15, and the second grid pool 15 is connected to the The cyclone sand settling device is connected.

In the above embodiment, the coarser (diameter greater than 20mm) suspended matter in the initial rain can be preliminarily removed through the first grid pool 12, and debris with a larger diameter can be intercepted to ensure that the follow-up treatment facilities can operate normally, and after preliminary The initial rain of slag removal treatment enters the water pump forebay 13, is transferred to the discharge pool 14 by the lift pump 131, and overflows into the second grid pool 15, and passes through the second grid pool 15 Larger floating objects in the initial rain can be removed twice, such as filamentous and ribbon-shaped floating objects, to protect the normal operation of subsequent processing equipment.

In practice, the coarse grille decontamination machine can be selected from rotary multi-rake grille decontamination machine, wire rope traction type grille decontamination machine, high chain type grille decontamination machine and hanging mobile grab type grille decontamination machine. machine. The present invention preferably uses a wire rope traction type grid decontamination machine. All the moving parts of the wire rope traction grille decontamination machine are above the water surface, which is convenient for maintenance and repair; it adopts the design of large-capacity, heavy-duty grab-type rake; the grille body can be installed vertically without affecting the decontamination effect, and the grille can be directly excavated Bottom sand settling, good cleaning effect. The grid gap is 15-20mm, the installation inclination angle is 65-75°, and the flow rate through the grid is 0.8-1m/s.

The type of the fine grid decontamination machine can be selected from toothed rake rotary grid decontamination machine, stepped grid decontamination machine, drum type grid decontamination machine, Fajiesi F series grid decontamination machine and Internal flow orifice grill decontamination machine. The present invention preferably uses an internal inflow orifice-type grille decontamination machine, which has a compact structure, a small footprint, a large initial rainfall, can adapt to the fluctuation of the influent level, and has a small water head loss; it has high efficiency in intercepting filter residues, fibers and other substances. The aperture is 4-5mm, the water loss through the grid is ≤450mm, and the water depth in front of the grid is 2000mm.

Optionally, the side wall of the distribution channel 11 close to the first grid pool 12 is provided with a first water outlet communicating with the first grid pool 12, and the first grid pool 12 A second water outlet connected to the water pump front pool 13 is provided on the side wall close to the water pump front pool 13, and a second water outlet is provided on the side wall of the water outlet pool 14 near the second grid pool 15 side. There is an overflow port communicating with the second grid pool 15, and the side wall of the second grid pool 15 away from the side wall of the outlet pool 14 is provided with a first channel communicating with the cyclone sand settling device. Three water outlets, the first water outlet, the second water outlet, the overflow and the third water outlet are all provided with a valve 16 for opening or closing the corresponding water flow channel. In the above-mentioned embodiment, by setting the valve 16 at the position of the corresponding water flow channel, it is convenient to open or close the corresponding water flow channel, to facilitate the adjustment of the water level in different devices, and to facilitate the maintenance of various components in the system, improving the maintenance efficiency. efficiency.

As shown in Figure 2, in one embodiment of the present invention, the cyclone grit chamber includes a hollow cylindrical cyclone grit chamber 21, and the top wall of the cyclone grit chamber 21 is suspended with an upper and lower penetrating wall. The central cylinder 22, the lower end of the central cylinder 22 is in the shape of an inverted cone, the side wall of the cyclone grit chamber 21 is provided with a water inlet along the tangential direction, and the first rain treated by slag removal is collected from the After the water inlet enters the swirl grit chamber 21, a swirl flow is formed along the wall of the swirl grit chamber 21, and the grit in the initial rain settles to the sand at the bottom of the swirl grit chamber 21. In the bucket, the first rain enters the reaction sedimentation device from the fourth water outlet at the top of the cyclone grit chamber 21 through a pipeline, and at least one is provided at the bottom of the central cylinder 22 for disposing of the gravel in the sand bucket. The sand is transferred to the sand lifting pump 23 outside the swirling flow grit chamber 21 through the guide cylinder passing through the central cylinder 22 .

Since the lower end of the central cylinder 22 is set in an inverted cone shape, when the downward swirling flow reaches the lower end of the central cylinder 22, a spiral upward swirling flow will be formed on the outer periphery of the central cylinder 22. The flow velocity at the junction of the swirling flow and the upward swirling flow is zero, and the gravel in the initial rain will settle into the mud bucket at the bottom of the swirling flow grit chamber 21 due to the influence of gravity.

In the above-mentioned embodiment, the grit in the initial rain is settled by passing the slag removal treatment by the slagging device along the tangential direction of the swirl grit chamber 21 into the swirl grit chamber 21. to the sand bucket at the bottom of the swirl grit chamber 21, and transferred to the outside of the swirl grit chamber 21 via the lift pump 23, to complete the grit treatment of the initial rain, and remove the relatively large particle size ( ≥ 0.1mm) large inorganic sand, to protect the follow-up pipeline and water treatment equipment, and reduce the sand in the sludge.

Optionally, in an embodiment of the present invention, the cyclone grit chamber further includes an annular flow guide 24, and the flow guide 24 is arranged at the bottom of the cyclone grit chamber 21 , the outer edge of the deflector 24 is connected to the inner wall of the swirling grit chamber 21, and the outer edge of the deflector 24 is higher than the inner edge, and the sand lifting pump 23 is located in the deflector 24 in the center hole. In the above embodiment, the flow guide 24 can facilitate the grit in the initial rain to settle to the bottom of the swirl grit chamber 21 and then smoothly enter the central hole of the flow guide 24, thereby facilitating the lifting of the pump 23. The settled grit is transferred to the outside of the cyclone settling tank 21, so that the grit in the first rain can be completely separated from the rainwater.

As shown in Figure 3, in one embodiment of the present invention, the reaction sedimentation device includes a reaction tank 31 and a sedimentation tank 32, the side wall of the reaction tank 31 near the side of the sedimentation tank 32 is provided with a The first water hole that communicates with the sedimentation tank 32.

The top of the reaction tank 31 is provided with a stirrer 311 for stirring the mixed solution, and the upper port of the sedimentation tank 32 is provided with a support member 321, and a mud scraper 322 is suspended on the support member 321. The lower end of the mud scraper 322 is arranged at the bottom of the settling tank 32, and the upper part of the settling tank 32 is provided with an inclined pipe 324 for separating the muddy water from the incoming mixed solution, and a sump is arranged above the inclined pipe 324. 325, the clear water separated from muddy water is discharged from the sump 325, the bottom of the sedimentation tank 32 is provided with a mud bucket 323, and the lower end of the mud scraper 322 is located above the mud bucket 323, and will pass through Sludge separated from mud and water is scraped into the mud hopper 323 .

In practice, in order to make the clear water in the upper layer drain out from the sump 325 more smoothly, it is necessary to set a second water hole at the same height as the sump 325 on the support 321, so that the upper clear water can be easily drained The relatively smooth flow in the sump 325 is convenient to discharge the upper layer of clear water in time.

In the above-mentioned embodiment, the initial rain forms a mixed liquid after chemical reaction with the added composite flocculant in the reaction tank 31, and the mixed liquid enters the sedimentation tank 32 through the first water hole, and flows from bottom to bottom. Fill the sedimentation tank 32 above, and separate the mixed solution from mud and water by the inclined pipe 324 to obtain sludge and clear water. The sludge settles to the bottom of the sedimentation tank 32 and passes through the mud scraper 322 is scraped into the mud hopper 323, and the clear water is discharged from the sump 325, which realizes the efficient decontamination treatment of the first rain.

Optionally, in one embodiment of the present invention, the number of the reaction pools 31 is multiple, and the multiple reaction pools 31 are connected in sequence, and the reaction pools 31 of the first stage are connected to the cyclone through pipelines. The flow sand settling device is connected, and the reaction tank 31 of the last stage is connected with the sedimentation tank 32 through a pipeline. In the above-mentioned embodiment, multiple reaction tanks can make the initial rain and the composite flocculant react more fully, which facilitates more efficient removal of dirt in the initial rain and achieves a higher decontamination effect.

Optionally, in one embodiment of the present invention, the bottom surface of the sedimentation tank 32 is recessed downward, and the edge of the bottom surface of the sedimentation tank 32 is higher than the middle position of the bottom surface, and the mud bucket 323 is located on the bottom surface at the center position. Through this structure, the sludge formed by the settlement of the mixed liquid can smoothly enter the lower end of the mud scraper 322 and enter the mud bucket 323 smoothly.

Optionally, in one embodiment of the present invention, the settling tank 32 is provided with a deflector 326 for guiding the incoming mixed solution to the lower end of the mud scraper 322, and the deflector 326 is set on the side of the sedimentation tank 32 close to the reaction tank 31 . In the above-mentioned embodiment, the mixed liquid entering the sedimentation tank 32 can be guided to the lower end of the mud scraper 322 through the deflector 326, so that the mixed liquid settles at the lower end of the mud scraper 326. The sludge is scraped into the mud bucket 323.

The present invention also provides a method for treating initial rain, which adopts the described first rain treatment system, and the method comprises the following steps:

Step 1: using the slag removal device to remove slag from the first rain;

Step 2: Pass the primary rain treated by slag removal into the cyclone grit settling device, and carry out the cyclone grit settling treatment;

Step 3: Pass the primary rain treated by cyclone dust into the reaction sedimentation tank, and add a composite flocculant to form the mixed solution, and stir the mixed solution evenly before separating the mud and water to obtain sludge and clean water, and drain the clean water outside, and transport the sludge out for treatment.

The initial rain treatment method of the present invention can better remove the suspended matter SS and total phosphorus TP in the initial rain, can effectively reduce the chemical oxygen demand COD and the total nitrogen content TN in the initial rain, and can meet the operation requirements of intermittent operation, Fast start-up and high shock load resistance. The primary rain treatment system of the present invention has the advantages of small land occupation, low cost, high decontamination efficiency, simple equipment maintenance, long service life, no blower and aeration device, etc., saving energy consumption.

Optionally, in an embodiment of the present invention, the step 1 specifically includes:

Step 11: Use the coarse grid decontamination machine 121 to perform initial decontamination treatment on the first rain;

Step 12: The primary rain after preliminary slag removal treatment enters the water pump forebay 13, is transferred by the lift pump 131 to the outlet pool 14, and overflows from the outlet pool 14 to the second grid pool 15 Inside;

Step 13: Use the fine grid decontamination machine 151 to perform secondary decontamination treatment on the first rain.

Through the first grid pool 12, the coarser suspended matter in the initial rain can be preliminarily removed, and the debris with a larger diameter can be intercepted to ensure the normal operation of the follow-up treatment facilities, and the initial rain after preliminary slag removal treatment enters the front of the water pump In the pool 13, it is transferred to the outlet pool 14 by the lifting pump 131, and overflows into the second grid pool 15, through which the larger floating objects in the primary rain can be removed for the second time, Such as filamentous and ribbon-shaped floating objects, to protect the normal operation of subsequent processing equipment.

Optionally, in one embodiment of the present invention, the step 2 includes:

Step 21: The initial rain entering the swirl grit chamber 21 forms a swirl flow along the pool wall, forms a downward swirl flow and descends to the lower end of the central cylinder 22, and then forms an upward swirl flow around the central cylinder 22. The swirling flow, the grit located at the junction of the downward swirling flow and the upward swirling flow settles into the sand bucket at the bottom of the swirling flow grit chamber 21;

Step 22: flushing and fluidizing the gravel in the sand bucket at the bottom of the cyclone grit chamber 21;

Step 23: Using the lift pump 23 to transfer the gravel in the sand bucket at the bottom of the swirl grit chamber 21 to the outside of the swirl grit chamber 21 through the pipeline passing through the central cylinder 22 .

By passing through the slagging treatment of the slag removal device in the tangential direction along the swirl grit chamber 21 into the swirl grit chamber 21, the initial rain will be in the swirl grit chamber 21 forms a downward swirl flow and descends to the lower end of the central cylinder 22, and forms an upward swirl flow around the central cylinder 22, due to the water velocity at the junction of the downward swirl flow and the upward swirl flow If it is zero, the gravel in this area will settle into the sand bucket at the bottom of the swirl grit chamber 21 due to gravity, and will be transferred to the outside of the swirl grit chamber 21 via the lift pump 23 to complete the initial rain removal. Grit treatment.

Here, one side wall of the swirling flow grit chamber 21 is provided with a water inlet along the tangential direction at the upper part of the tank body, and the distance from the top of the tank body is about 1/3 of the height of the tank body. method, the inlet flow rate is 1.2-1.5m/s; the fourth water outlet is set on the top of the circular pool, and the water inlet and outlet angles can be 45°, 90°, 180°, 270°, 360° according to the site conditions Adjustment. Gravity flow piping connects the incoming water and overflows the outgoing water through channels. The diversion cylinder is arranged inside the pool body, and the diversion cylinder divides the pool body into two parts inside and outside, the outside is the water inlet area, the inside is the water outlet area, and the water inlet area and the water outlet area are connected at the bottom.

Since the gravel settled to the bottom of the cyclone grit chamber 21 is compacted, its fluidity is poor. In order to smoothly suck sand and lift sand, avoid sand and gravel from clogging in the pump and pipeline. Before sand lifting, wash with flushing water to fully fluidize the gravel and improve its fluidity. The backwash flow rate is generally 5L/s of water, the water pressure is 0.4MPa, and the flushing time is 10min.

In addition, the sand lifting pump 23 is controlled by an electric control box, and an appropriate sand lifting frequency is set according to the amount of sand. The proposed grit can enter into the sand-water separator with cyclone, so as to realize the further separation of sand and water.

Compared with the traditional cyclone grit chamber, the hydrocyclone grit chamber adopts a non-powered design—the agitation system is canceled, and all rely on the promotion of the hydraulic force to generate eddy currents. Therefore, there are no stirring blades, no gear connections, no geared motors, and no moving parts in the pool, which simplifies the equipment to the greatest extent. In addition, the unique design of the flow guide can guide the water flow to form a longer flow, increase the hydraulic retention time, enhance the settlement effect, and improve the sand settling effect. In addition, the water surface of the hydrocyclone desanding device is small, and generally adopts a completely closed structure to minimize the emission of odors, without the need for complex odor collection and treatment devices, saving a lot of costs.

Furthermore, traditional aerated grit chambers require continuous aeration of sewage to wash away the gravel and separate the gravel from organic matter. The amount of aeration is related to the amount of sewage, and the air-water ratio is about 0.1-0.2. For large sewage plants, fans are required, and the average annual power consumption is very huge. The hydrocyclone relies on the cyclone technology to separate the sediment and water, without aerating all the incoming water, saving a lot of energy consumption.

Optionally, in an embodiment of the present invention, the step 3 specifically includes:

Step 31: adding a composite flocculant into the reaction tank 31 to form a mixed solution, stirring and mixing evenly, and passing the mixed solution into the sedimentation tank 32;

Step 32: The mixed solution enters the sedimentation tank 32 and forms a bottom-up liquid flow, and separates the mud and water through the inclined pipe 324 to obtain sludge and clear water, and the sludge settles to the bottom of the sedimentation tank 32 And it is scraped into the mud bucket 323 by the mud scraper 322, and the clear water is discharged out of the sump 325.

The initial rain forms a mixed solution with the added composite flocculant in the reaction tank 31, and enters the sedimentation tank 32, and the mixed solution is separated from mud and water by the inclined pipe 324 to obtain sludge and clear water. The mud settles to the bottom of the settling tank 32 and is scraped into the mud bucket 323 by the mud scraper 322, and the clear water is drained out of the sump 325, realizing the efficient decontamination treatment of the first rain.

Optionally, in one embodiment of the present invention, there are multiple reaction pools 31, and the step 31 specifically includes:

Step 31: Add polyaluminum chloride PAC and magnetic powder to the first-stage reaction pool 31, stir and mix evenly, and pass it into the second-stage reaction pool 31;

Step 32: Passing backflow sludge into the second-stage reaction tank 31 and stirring to form a mixed solution containing flocs, and passing it into the third-stage reaction tank;

Step 33: Add polyacrylamide PAM into the third-level reaction tank 31, stir and mix evenly to form a mixed solution containing alum flowers, and pass it into the sedimentation tank 32.

Through multiple reaction pools 31, the initial rain and the composite flocculant can react more fully, which facilitates more efficient removal of dirt in the initial rain and achieves a higher decontamination effect. It should be pointed out that the mixed solution passed into the sedimentation tank 32 is a mixed solution containing alum flowers.

In an embodiment of the present invention, the reaction residence time in the first-stage reaction pool 31 is 1-3min, and the velocity gradient G is 400-1000/s; in the second-stage reaction pool 31, the reaction residence time is 2-5min, and the velocity gradient G is 100-300/s. The residence time in the third-stage reaction tank 31 is 4-10 min, and the velocity gradient G is 20-60/s.

The surface load design of the upper layer of the sedimentation tank can be as high as 20-40m3/m2h, the aperture of the inclined tube 324 (or the net distance of the inclined plate) should be 80mm~100mm; the length of the inclined pipe 324 (plate) should be 1.0m~1.2m; the inclined pipe 324 ( Plate) horizontal inclination should be 60°; the water depth in the clear water area above the inclined pipe 324 (plate) area should not be less than 1.0m.

Compared with the traditional high-efficiency sedimentation tank, which forms flocs with a lighter specific gravity (the density is 1.0-1.1, and the surface load of the sedimentation tank is about 6-10m ³ /㎡h); in the present invention, PAC and magnetic powder and PAM, by adding magnetic powder as a flocculation carrier, the density of the magnetic powder is about 6, and the surface load design of the upper layer of the sedimentation tank can be as high as 20-40m ³ /㎡h. Therefore, the reaction-precipitation process of the present invention has great advantages in floor area and construction cost.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (10)

1. a kind of just rain processing system, it is characterised in that: including deslagging device, rotational flow sand sinking device and reaction settler, institute State deslagging device, rotational flow sand sinking device is sequentially connected to reaction settler；

After first rain enters the deslagging device, the deslagging device carries out except Slag treatment first rain, and will be by removing by pipeline The first rain of Slag treatment is passed through by pipeline into the rotational flow sand sinking device, and it is heavy that the rotational flow sand sinking device carries out eddy flow to first rain Sand processing, and will be passed through by pipeline into the reaction settler by the first rain of sediment by rotational flow processing, and described anti- It answers and composite flocculation agent formation mixed liquor is added in settler, carry out mud-water separation after being uniformly mixed to the mixed liquor, Sludge and clear water are obtained, and by clear water outlet, sludge outward transport is handled.

2. just rain processing system according to claim 1, which is characterized in that the deslagging device include distributing channel (11), First grid pond (12), water pump forebay (13), discharge bay (14) and the second grid pond (15), the distributing channel (11), the first lattice Grid pond (12), water pump forebay (13), discharge bay (14) and the second grid pond (15) are successively disposed adjacent, the distributing channel (11), First grid pond (12), water pump forebay (13), discharge bay (14) are sequentially connected to the second grid pond (15)；

The coarse rack spotter (121) setting first grid pond (12) outside, and the coarse rack spotter (121) Decontamination grid stretches in first grid pond (12) from the upper port of first grid pond (12), the water pump forebay (13) bottom is equipped with elevator pump (131), and the water outlet of the elevator pump (131) is connected by pipeline and the discharge bay (14) It is logical, fine fack spotter (151) are equipped in second grid pond (15), and the fine fack spotter (151) is equipped with machine Second grid pond (15) is stretched out in one end of frame upwards, and second grid pond (15) is connected to the rotational flow sand sinking device.

3. just rain processing system according to claim 2, which is characterized in that the distributing channel (11) is close to first lattice The side wall of grid pond (12) side is equipped with the first water outlet being connected to first grid pond (12), first grid pond (12) side wall close to water pump forebay (13) side is equipped with the second water outlet being connected to the water pump forebay (13), institute It states the side wall of discharge bay (14) close to described second grid pond (15) side and is equipped with and be connected to second grid pond (15) Overflow port, the side wall on second grid pond (15) far from the discharge bay (14) side is equipped with and the sediment by rotational flow fills The third water outlet of connection is set, first water outlet, the second water outlet, overflow port and third water outlet, which go out, to be equipped with for beating The valve (16) of corresponding water stream channel is closed on or off.

4. just rain processing system according to claim 1, which is characterized in that the rotational flow sand sinking device includes hollow circuit cylinder The roof suspension of the rotational flow grit chamber (21) of shape, the rotational flow grit chamber (21) is provided with central tube (22) up and down, institute The lower end for stating central tube (22) is in inverted cone shape, is equipped with and intakes along tangential direction on the side side wall of the rotational flow grit chamber (21) Mouthful, and by the first rain except Slag treatment from the water inlet into after the rotational flow grit chamber (21) in the rotational flow grit chamber (21) eddy flow is formed along pool wall in, and just gravel in the rain is settled down in the sand hopper of the rotational flow grit chamber (21) bottom, just Rain enters the reaction settler, the central tube by pipeline from the 4th water outlet at the top of the rotational flow grit chamber (21) (22) bottom is additionally provided at least one for turning the gravel in the sand hopper by passing through the guide shell of the central tube (22) It moves to the sand that mentions of rotational flow grit chamber (21) outside and pumps (23).

5. just rain processing system according to claim 4, which is characterized in that the rotational flow sand sinking device further includes annular in shape Conducting element (24), the bottom that the conducting element (24) is arranged in the rotational flow grit chamber (21), the conducting element (24) Outer edge is connect with the rotational flow grit chamber (21) inner wall, and the outer edge of the conducting element (24) is higher than inward flange, and described Husky pump (23) is mentioned to be located in the centre bore of the conducting element (24).

6. just rain processing system according to claim 1, it is characterised in that: the reaction settler includes reaction tank (31) it is equipped with and the sedimentation basin with sedimentation basin (32), side wall of the reaction tank (31) close to the sedimentation basin (32) side (32) the first water hole being connected to；

The top of the reaction tank (31) is equipped with the blender (311) being stirred to the mixed liquor, the sedimentation basin (32) Upper port in be equipped with supporting element (321), suspension is provided with mud scraper (322), the mud scraper on the supporting element (321) (322) lower end setting is equipped on the bottom of the sedimentation basin (32), the top of the sedimentation basin (32) for mixing to entrance The inclined tube (324) that liquid carries out mud-water separation is closed, catch basin (325) are provided with above the inclined tube (324), by mud-water separation Clear water is from the catch basin (325) outlet, and the bottom of the sedimentation basin (32) is equipped with bucket (323), and the mud scraper (322) Lower end be located at the top of the bucket (323), and will be in the sludge scraping Jing Guo mud-water separation to the bucket (323).

7. just rain processing system according to claim 6, which is characterized in that the quantity of the reaction tank (31) be it is multiple, And multiple reaction tanks (31) are sequentially connected to, reaction tank described in the first order (31) is connected by pipeline and the rotational flow sand sinking device Logical, reaction tank described in afterbody (31) is connected to by pipeline with the sedimentation basin (32).

8. just rain processing system according to claim 6, which is characterized in that the bottom surface of the sedimentation basin (32) is to lower recess Setting, and the edge of the sedimentation basin (32) bottom surface is higher than bottom surface middle position, the bucket (323) is located at the bottom surface Center position.

9. just rain processing system according to claim 6, which is characterized in that be equipped in the sedimentation basin (32) for will be into The mixed liquor entered is guided to the deflector (326) of the mud scraper (322) lower end, and the deflector (326) is arranged in institute State the side in sedimentation basin (32) close to the reaction tank (31).

10. a kind of just rain processing method, which is characterized in that it uses the described in any item just rain processing systems of claim 1-9, Its method includes the following steps:

Step 1: first rain being carried out except Slag treatment using the deslagging device；

Step 2: will be passed through by the first rain except Slag treatment into the rotational flow sand sinking device, and carry out sediment by rotational flow processing；

Step 3: will be passed through by the first rain of eddy flow dirt sand processing into progress reaction settling basin, and composite flocculation agent is added and is formed The mixed liquor, and mud-water separation is carried out after being uniformly mixed to the mixed liquor, sludge and clear water are obtained, and will be outside clear water Row, sludge outward transport processing.