CN204865133U - Sewage treatment sand filter system - Google Patents

Abstract

The utility model discloses a sand filter tank system for sewage treatment, which comprises a water inlet channel, an outlet channel, a sand filter tank, a water inlet main pipe connected to the water inlet channel, a backwash drainage pipe and several continuous flow sand filters installed in the sand filter tank. device; each continuous sand filter device includes a water inlet pipe and a sewage pipe, and the water inlet pipes of all continuous sand filter devices are connected to the main water inlet pipe, and the sewage pipes of all continuous sand filter devices are connected to the backwash drainage pipe; the outlet channel and the sand filter The upper part of the pool is connected. The continuous flow sand filter device includes a water inlet pipe, a water inlet main pipe connected to the water inlet pipe, a water distributor, a central pipe, an air lift pump, a sand washer, a clean water outlet pipe, a sewage pipe, a bottom cone bucket, and a sand guide bucket. The utility model has the advantages of good filtering effect, low maintenance cost, high working efficiency, long service life, easy installation, convenient maintenance, low cost, can continuously treat a large amount of sewage, and can better realize the purification treatment of sewage.

Description

A sand filter system for sewage treatment

technical field

The utility model relates to the technical field of sewage treatment.

Background technique

Sewage treatment is widely used in various fields such as construction, agriculture, transportation, energy, petrochemical, environmental protection, urban landscape, medical treatment, catering, etc., and it is also increasingly entering the daily life of ordinary people. Sewage treatment can be divided into three types according to its function: physical method, biological method and chemical method. Physical method: It mainly uses physical action to separate insoluble substances in sewage, and does not change the chemical properties during the treatment process. Commonly used are gravity separation, centrifugal separation, reverse osmosis, air flotation and so on. Physical treatment of structures is relatively simple and economical, and it is used in villages and towns where the water body has a large capacity, strong self-purification ability, and low requirements for sewage treatment. Biological method: Utilize the metabolic function of microorganisms to decompose and oxidize dissolved or colloidal organic matter in sewage into stable inorganic substances, so as to purify sewage. Commonly used are activated sludge method and biofilm method. The degree of biological treatment is higher than that of physical treatment. Chemical method: It is a method of using chemical reaction to treat or recover dissolved substances or colloidal substances in sewage, and it is mostly used in industrial wastewater. Commonly used are coagulation method, neutralization method, redox method, ion exchange method and so on. The chemical treatment method has good treatment effect and high cost, and is mostly used as the effluent after biochemical treatment for further treatment to improve the quality of the effluent.

Nitrogen and phosphorus pollution are very harmful to natural water bodies. It has become an increasingly urgent task to "upgrade and transform" the effluent of existing municipal sewage treatment plants. Due to the lack of nitrification and denitrification process in some sewage treatment facilities or unstable and reliable operation, the ammonia nitrogen or total nitrogen in the final biochemical effluent is still maintained at a high level.

The continuous flow sand filter device with nitrification and denitrification functions is the best solution for "standard improvement" to further remove ammonia nitrogen or total nitrogen; and relying on flocculation reaction and its own physical and chemical separation function, continuous flow sand filter device can also treat wastewater Phosphorus is removed to very low levels. The effectiveness of these denitrification and phosphorus removal makes the continuous flow sand filter device widely used in the "standard improvement" of municipal wastewater. At the same time, during the whole denitrification and phosphorus removal process, the powerful self-cleaning and filtering effect of the continuous quicksand filter device itself can make the suspended solids and turbidity of the effluent obtain a very low level.

A main defect of the existing quicksand filtering device is high cost, the main reason being that most of the components are integral structures, which need to be replaced as a whole after damage, resulting in high maintenance costs. For example: the sand washing machine is mainly composed of inner helical tube and outer helical tube. In long-term use, the inner helical tube and outer helical tube are easy to wear, resulting in poor treatment effect, and the whole inner helical tube and outer helical tube need to be replaced during maintenance. Spiral pipe, resulting in high maintenance costs. In addition, the sand washing effect of the spiral channel of the existing sand washing device is poor, causing the suspended solids to be removed to return to the system repeatedly with the flowing sand, affecting the water discharge effect.

Utility model content

The technical problem to be solved by the utility model is to provide a sewage treatment sand filter system with convenient maintenance and low cost, which can better realize the purification treatment of sewage.

The technical scheme of the utility model is: a sand filter system for sewage treatment, including an inlet channel, an outlet channel, a sand filter tank, a water inlet main pipe connected to the water inlet channel, a backwash drainage pipe and several sand filter tanks Continuous flow sand filter device; each continuous flow sand filter device includes water inlet pipe and sewage pipe, the water inlet pipes of all continuous flow sand filter devices are connected to the main water inlet pipe, and the sewage pipes of all continuous flow sand filter devices are connected to the backwash drainage pipe; the outlet channel It is connected with the upper part of the sand filter.

The continuous flow sand filter device includes a water inlet pipe, a water inlet main pipe connected to the water inlet pipe, a water distributor, a central pipe, an air lift pump, a sand washer, a clean water outlet pipe, a sewage pipe, a bottom cone bucket, and a sand guide bucket; The lower end of the water main pipe is connected with the water distributor, and the water outlet of the water distributor is upward. There is a central pipe inside the main water inlet pipe. The lower end of the central pipe is connected with an air lift pump, and the upper end is connected with a sand washer. The sand washer includes a water collection shell. , water collection container, center plate, inner casing and outer casing are arranged in the water collecting casing, and the outer wall of the inner casing and the inner wall of the outer casing are provided with spirally distributed protrusions, the outer wall of the inner casing and the outer casing The center plate is connected between them, and there is a water outlet joint on the center plate. The opening at the end of the water inlet main pipe is set in the water collection container on the top of the sand washer. The upper end of the water collection container is connected with the clean water outlet pipe, and the lower end is connected with the sewage pipe. The water outlet of the clean water outlet pipe is connected to the upper part of the sand filter; the air lift pump is set in the bottom cone bucket, the bottom cone bucket is set in the bottom of the sand filter tank, and a sand guide bucket is set between the bottom cone bucket and the water distributor; Four supporting devices are arranged between the lower end of the sand guide bucket and the inner wall of the bottom cone bucket.

16 evenly distributed continuous flowing sand filtering devices are installed in the sand filter, four rows in total, four in each row.

The sand filter system for sewage treatment also includes a backwash wastewater discharge main pipe connected to the backwash drain pipe.

The top of the sand filter is provided with a pre-embedded steel plate 1, and I-beams and walkway plates are installed.

The bottom cone is a concrete structure poured with steel molds, including four layers from bottom to top: the first layer at the bottom, the second layer at the bottom, the third layer at the bottom, and the fourth layer at the bottom; Embedded steel plate 2.

There are 16 bottom cone buckets evenly distributed on the bottom of the sand filter, four rows in total, four in each row; between the bottom cone bucket and the bottom cone bucket is a diamond-shaped cone frustum made of bricks. The included angle of the bottom surface is 50 degrees.

The sand filter system for sewage treatment also includes a filter material located in the sand filter.

The utility model has the advantages of good filtering effect, low maintenance cost, high working efficiency, long service life, easy installation, convenient maintenance, low cost, can continuously treat a large amount of sewage, and can better realize the purification treatment of sewage. The sand washer makes a spiral channel between the inner casing and the outer casing by setting protrusions, which is convenient for inspection and maintenance of the sand washer without affecting the operation of the sand washer. When the protrusions are worn out, only the protrusions need to be replaced , there is no need to replace the entire sand washer, and it is not necessary to frequently replace the inner casing and the outer casing. It is beneficial to save the maintenance cost and improve the utilization rate of the device. When the filter medium passes through the spiral channel, the turbulent state of the medium is intensified, so that the active sand is separated from the intercepted suspended matter, and the effect of removing suspended matter is achieved. In addition, the inner casing and the connected air lift pump system can be lifted for inspection separately, which is convenient for inspection of the sand washer, center pipe and sand lifting device.

Description of drawings

Figure 1 is a schematic diagram of the front view of the sand filter system for sewage treatment of the present invention.

Fig. 2 is a right view structure diagram of the sewage treatment sand filter system of the present invention.

Fig. 3 is a top view structure diagram of the sewage treatment sand filter system of the present invention.

Figure 4 is an enlarged schematic view of the sand washer.

FIG. 5 is a schematic top view of FIG. 4 .

Among them: 1. Sand filter, 2. Water inlet channel, 3. Water inlet main pipe, 3-1. Water inlet pipe, 3-2. Water inlet main pipe, 4. Water distributor, 5. Bottom cone bucket, 6. Support device , 7. Air lift pump, 8. Center pipe, 9. Sand washer, 9-1. Water collection shell, 9-2. Inner casing, 9-3. Outer casing, 9-4, raised, 9- 5. Water collection container, 9-6. Center plate, 9-7. Water outlet joint, 10. Outlet channel, 11. Backwash drain pipe, 11-1. Sewage pipe, 12. Sand guide bucket, 13. I-beam , 14. Aisle plate, 15. Backwash waste water discharge main pipe, 16. The first layer at the bottom, 17. The second layer at the bottom, 18. The third layer at the bottom, 19. The fourth layer at the bottom, 20. Embedded steel plate 1, 21 . Embedded steel plate 2, 22. Continuous flow sand filter device, 23. Adjusting plate.

Detailed ways

As shown in Figures 1 to 5, a sand filter system for sewage treatment includes an inlet channel 2, an outlet channel 10, a sand filter tank 1, an inlet main pipe 3 connecting the inlet channel, a backwash drain pipe 11, and a backwash The backwash waste water discharge main pipe 15 of drainage pipe and sixteen continuous flow sand filtering devices 22 (four rows in total, four in every row) installed in the sand filter tank. The water inlet pipes 3-1 of all continuous sand filter devices are connected to the main water inlet pipe, and the sewage pipes 11-1 of all continuous sand filter devices are connected to backwash drain pipes; the outlet channel is connected with the upper part of the sand filter tank. The top of the sand filter tank is provided with several pre-embedded steel plates 120 in advance, and several I-beams 13 are installed, and a walkway plate 14 is installed on the I-beams.

The continuous flow sand filter device includes a water inlet pipe 3-1, a water inlet main pipe 3-2 connected to the water inlet pipe, a water distributor 4, a central pipe 8, an air lift pump 7, a sand washer 9, a clean water outlet pipe, and a sewage pipe 11- 1. Bottom cone bucket 5, sand guiding bucket 12. Sixteen bottom cone buckets are evenly distributed on the bottom of the sand filter, and there are four rows in total, four in each row. Each bottom cone is a concrete structure, poured with steel molds, and consists of four layers from bottom to top: the first bottom layer 16, the bottom second layer 17, the bottom third layer 18, and the bottom fourth layer 19; the bottom cone The bottom end is provided with pre-embedded steel plate 221. Between the bottom cone bucket and the bottom cone bucket, and between the bottom cone bucket and the sand filter pool wall are all diamond-shaped cone truncated bottoms made of bricks, and the angle between the side and bottom of the truncated cone is 50 degrees.

The bottom cone bucket is poured with steel molds, and the concrete pouring is divided into four pours, one layer each time. After the pouring of the bottom cone bucket is completed, bricks are used between the bottom cone bucket and the bottom cone bucket, and between the bottom cone bucket and the corner (wall corner) of the sand filter to form a diamond-shaped cone frustum with an angle of 50 degrees, and then the surface is plastered with mortar. The bottom cone bucket is fixed with pre-embedded steel plate 2.

The lower end of the water inlet main pipe 3-2 of the continuous flow sand filter device is connected with the water distributor 4, the water outlet of the water distributor 4 is upward, the water inlet main pipe 3 is provided with a central pipe 8, and the lower end of the central pipe 8 is connected with an air lift pump 7 , The upper end is connected with a sand washer 9, the sand washer 9 includes a water collection shell 9-1, the water collection shell 9-1 is provided with an inner casing 9-2 and an outer casing 9-3, and the inner casing 9-2 The outer wall and the inner wall of the outer casing 9-3 are provided with spirally distributed protrusions 9-4, and the outer wall of the inner casing 9-2 and the outer casing 9-3 are connected by a central plate 9-6, and the central plate 9- 6 is provided with a water outlet seam 9-7, and the opening at the end of the water inlet main pipe 3-2 is arranged in the water collection container 9-5 at the top of the sand washer 9, and the upper end of the water collection container 9-5 is connected with the clean water outlet pipe, The lower end is connected with the sewage pipe 11-1, the air lift pump 7 is set in the bottom cone bucket 5, the bottom cone bucket 5 is set at the bottom of the pool, and the sand guide bucket 12 is arranged between the bottom cone bucket 5 and the water distributor 4. ; There are four supporting devices 6 between the lower end of the sand guide bucket and the inner wall of the bottom cone bucket.

The central pipe and its lower end are connected with the air lift pump and the inner casing of the sand washer, which can be easily lifted without dismantling other components. The sand washer consists of an inner sleeve, an outer sleeve and protrusions. The protrusions are arranged in a spiral shape. When the filter sand descends through the labyrinth of the protrusion, the filter sand is forced to do vortex motion, and at the same time encounters the rising filtrate flow, the filter sand Impurities in the sand will be washed away and flow out with the rising washing water. The water collecting shell is fixed on the adjusting plate 23, and the adjusting plate is connected with the locking knob. Eight water distribution branch pipes are arranged on the water distributor, and the eight water distribution branch pipes are all distributed on the water inlet main pipe.

When in use, filter sand material (such as: quartz sand) is loaded into the pool to form a filter material layer. The sewage enters the inside of the filter device from the water inlet channel through the water inlet main pipe, water inlet pipe and water inlet main pipe, and is evenly sprayed upwards through the water distributor, and the water flows upwards against the filter material layer, so that the pollutant content in the water is reduced; at the same time, in the quartz sand The content of pollutants increases, and the content of pollutants in the lower filter material layer is higher than that of the upper filter material. The filtered water is discharged from the clean water outlet pipe to the upper part of the sand filter by gravity flow, and flows out through the outlet channel. The quartz sand at the bottom of the filter device is lifted by the air lift pump to the sand washer at the top of the filter device. The dirty particles are separated from the active sand by turbulent flow, and the impurities are discharged. The cleaned quartz sand falls back to the upper layer of the sand bed. The circulation of the quartz sand takes place in the central tube. The waste water after sand washing is discharged to the backwash drainage pipe through the sewage pipe, and then flows out through the backwash waste water discharge main pipe.

Since the quartz sand filter material is in a top-down motion state in the filter device, it agitates the raw water, so the agitation and flocculation can be completed in the filter device. The filter material in the filter device is clean and timely, and can withstand a high concentration of influent pollutants. When the mixture leaves the outlet of the air lift pump, the velocity drops and the quartz sand will fall into the sand washer. The impurities in the quartz sand will enter the backwash drainage pipe with the sand washing water from the sewage pipe, and then be discharged through the backwash waste water discharge main pipe. The amount of filter sand sucked into the air lift pump is controlled by controlling the air flow. Greater airflow will lift more filter sand and vice versa.

The above are only preferred embodiments of the present utility model, and the scope of protection of the present utility model is not limited thereto. All modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model are included in this utility model. within the scope of protection of utility models.

Claims (8)

1. a sewage disposal sand filter system, comprises inlet channel, outlet canal and sand filter, it is characterized in that, also comprise connect the water inlet manifold of inlet channel, backwash drainpipe and several be arranged on continuous quicksand filter in sand filter; Each continuous quicksand filter includes water inlet pipe, sewage pipe, and the water inlet pipe of all continuous quicksand filters all connects water inlet manifold, and the sewage pipe of all continuous quicksand filters all connects backwash drainpipe; Outlet canal is connected with sand filter top.

2. sewage disposal sand filter system according to claim 1, it is characterized in that, described continuous quicksand filter comprises water inlet pipe, the water inlet supervisor connecting water inlet pipe, water-locator, central tube, air lift, sand-washing device, water purification outlet pipe, sewage pipe, bottom cone bucket, leads sand hopper, the lower end of water inlet supervisor is connected with water-locator, the delivery port of water-locator upwards, central tube is provided with in water inlet supervisor, central tube lower end is connected with air lift, upper end is connected with sand-washing device, sand-washing device comprises the shell that catchments, collecting container, central plate, catchment in shell and be provided with inner sleeve and outer tube, the outer wall of inner sleeve and the inwall of outer tube are equipped with the projection of Spiral distribution, be connected by central plate between the outer wall of inner sleeve and outer tube, central plate offers water outlet seam, the opening of water inlet supervisor end is arranged in the collecting container at sand-washing device top, collecting container upper end is connected with water purification outlet pipe, lower end is connected with sewage pipe, the delivery port of water purification outlet pipe is communicated to the top of sand filter, air lift is arranged in the cone bucket of bottom, and bottom cone bucket is arranged in bottom sand filter, is provided with and leads sand hopper between bottom cone bucket and water-locator, lead between sand hopper lower end and bottom cone bucket inwall and be provided with four bracing or strutting arrangements.

3. sewage disposal sand filter system according to claim 1, is characterized in that, is provided with 16 equally distributed continuous quicksand filters in described sand filter, and totally four rows, often arrange four.

4. sewage disposal sand filter system according to claim 1, is characterized in that, described sewage disposal sand filter system also comprises the backwash waste discharge manifold connecting backwash drainpipe.

5. sewage disposal sand filter system according to claim 1, is characterized in that, described sand filter top is provided with pre-embedded steel slab one, and is provided with I-steel, walkway board.

6. sewage disposal sand filter system according to claim 2, is characterized in that, described bottom cone bucket is the xoncrete structure adopting punching block cast, comprises four layers from bottom to top altogether: bottom first layer, the bottom second layer, bottom third layer, bottom the 4th layer; Cone bucket bottom, bottom is provided with pre-embedded steel slab two.

7. sewage disposal sand filter system according to claim 5, is characterized in that, be evenly equipped with 16 bottom cone buckets bottom described sand filter altogether, totally four rows, often arrange four; Bottom cone bucket and bottom bore struggle against between be with brick become frustum, the angle of described frustum side and bottom surface is 50 degree.

8. sewage disposal sand filter system according to claim 1, is characterized in that, also comprise the filtrate being arranged in sand filter.