CN111675355A - System for be used for aeration tank not clear up can desilting silt sand - Google Patents

Abstract

The invention discloses a system for removing silt and sand without emptying an aeration tank, which is arranged on the aeration tank and comprises connecting hoses which are arranged on the aeration tank at intervals, wherein a plurality of sand suction units are arranged on each connecting hose at intervals, one end of each connecting hose extends out of the aeration tank and is connected with an external pipe in parallel, and the other end of the external pipe is connected with a vertical flow sand removing device. The invention controls the mud level to not affect the swing of the aeration head under the condition of ensuring that the bottom geomembrane anti-seepage structure is not damaged, simultaneously ensures the tank capacity and the water depth along with the reduction of the mud and sand amount, and enhances the treatment capacity of the system and the mass transfer efficiency of oxygen.

Description

System for be used for aeration tank not clear up can desilting silt sand

Technical Field

The invention relates to the field of wastewater treatment, in particular to a system for removing silt and sand without emptying an aeration tank.

Background

The Baileke process is one multistage active sludge sewage treating system with nitrogen and phosphorus eliminating function. The biochemical stage mainly comprises an anaerobic tank, an A/O tank, a secondary sedimentation tank and a stabilization tank. A suspension chain aeration device is adopted for aeration of the A/O pool, a movable aeration chain floats on the surface of the pool, and a plurality of floating microporous aeration heads are hung on the chain. The hanging chain ends are fixed on two sides of the aeration tank, the hanging chain can move in a snake shape in water, and the natural swing of the hanging chain can play an effective mixing role. Aeration head has the certain distance apart from the bottom of the pool, because of reasons such as the sand content of intaking is high, the sand-containing waste water backward flow of filtering pond back flush and equipment trouble can cause the continuous siltation of bottom of the pool silt sand, and the mud level is more and more high to block up aeration head, influence aeration efficiency, the air-blower superpressure operation brings very big potential safety production hazard.

The sewage treatment plant adopting the Braek process usually adopts the geomembrane as an impervious layer, the service life of the high-quality geomembrane is divided into two conditions, and the service life of the geomembrane can be shortened under the condition that the geomembrane is exposed and exposed to ultraviolet rays all the year round; if the earth is buried deeply for a long time and the earth is not exposed, the service life of the geomembrane can reach 10 years to 15 years or even longer. The geomembrane at the bottom of the aeration tank of the sewage plant with longer service life has an aging phenomenon. The traditional dredging mode needs a sewage plant to stop production, and the emptying aeration tank can not meet the current environment-friendly production requirement. If a pump is placed at the bottom of the pool for pumping, the anti-seepage structure is damaged, and immeasurable loss is brought. The invention discloses a silt removing method aiming at silt in an aeration tank without stopping water according to the characteristics of a Baileke process, which can be widely applied to new and old sewage treatment plants adopting the Baileke process and similar to aeration tank structures.

The traditional aeration tank dredging mode is water cut off, and silt is removed after the aeration tank is emptied, however, the method can not meet the current national and local environment-friendly production requirements, can influence the production benefit, and can damage the aged geomembrane anti-seepage structure to generate serious adverse effects; along with the increase of bottom of pool silt deposit, mud level is higher and higher, and the mud level can influence the swing of aeration head that floats after reaching the take the altitude, makes the aeration head swing reduce gradually, and the outside of aeration head is gathered to the silt, and the pressure of fan constantly risees, can bring huge negative effects for aeration system.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, provides a system for removing silt and sand in an aeration tank without emptying, and solves the problem of silt and sand deposition in the aeration tank in a sewage treatment plant adopting a Pleke process with long running time.

In order to achieve the aim, the invention designs a system for removing silt and sand without emptying an aeration tank, the system is arranged on an aeration tank and comprises connecting hoses which are arranged on the aeration tank at intervals, a plurality of sand suction units are arranged on each connecting hose at intervals, the sand suction unit comprises a hollow floating plate floating on the water surface of the aeration tank, an adjustable channel bracket is arranged on the hollow floating plate, a three-way pipe is arranged on the adjustable channel support, both ends of the three-way pipe of the middle sand suction unit are communicated with the connecting hose, one end of the three-way pipe of the sand suction unit at the end part is communicated with the connecting hose, the bottom end of the three-way pipe is communicated with an upper suction hose which vertically and downwards passes through the middle hole of the hollow floating plate, the bottom end of the upper suction hose is connected with a uniform hole sand suction pipe with two closed ends, and sand suction holes are formed in the bottom of the uniform hole sand suction pipe at intervals; one end of each connecting hose extends out of the aeration tank and is connected with an external pipe in parallel, and the other end of the external pipe is connected with a vertical flow sand removal device.

Further, the vertical flow sand removal device comprises a sand removal tank, a sand hopper is arranged at the bottom of the sand removal tank, a flow guide barrel is vertically arranged on the inner wall of the top of the sand removal tank, the flow guide barrel extends into the middle of the sand removal tank, the sand removal tank is connected with an external pipe, one end of the external pipe extends into the flow guide barrel, an annular water outlet groove is formed in the inner wall of the upper portion of the sand removal tank, a return pipe is connected to the bottom of the annular water outlet groove, the return pipe extends out of the sand removal tank through the wall of the sand removal tank, and an inclined sand removal machine is communicated with the inclined wall of the sand hopper.

And furthermore, a reflecting plate is arranged in the sand cleaning tank below the diversion barrel.

Still further, the sand hopper bottom is connected with the blow-down pipe.

Still further, the bottom of the sand cleaning tank is provided with a support frame.

Still further, a screw pump (an integral control connecting hose) is arranged on the external pipe.

Still further, the bottom end of the three-way pipe is provided with a control valve.

And furthermore, the distance between the hole-equalizing sand suction pipe and the bottom of the pool is 10-15 cm (the impermeable layer of the geomembrane is prevented from being damaged).

Still further, the connecting end of connecting hose and external pipe is provided with hose control valve.

The invention has the beneficial effects that:

1) the system for removing silt and sand without emptying the aeration tank comprises a connecting pipeline, a valve, a sand suction unit, a screw pump and vertical flow sand removing equipment; the hose used by the branch pipeline is constructed according to a Braille process blue water belt, the structure is stable, and the sand suction unit and the original underwater aeration head of the aeration tank are arranged in a staggered manner; the underwater aerator can be carried out according to the original design depth, so that the aeration efficiency is improved, the energy is saved, and the consumption is reduced;

2) the uniform hole sand suction pipe is a hard plastic pipe with two ends sealed and the bottom provided with a hole uniformly, one vertical side of a top hard pipe tee is connected with an underwater hose downwards, the two horizontal sides of the top hard pipe tee are connected with an above-water hose, and the underwater height of a sand suction cylinder is ensured by controlling the length of the underwater hose (keeping a certain safety distance from the bottom of a pool, and a geotechnical impermeable membrane cannot be damaged); the sand suction units are controlled by the floating plate not to sink, a plurality of sand suction units are connected to operate in series according to branch pipelines attached to the blue water zone of aeration, different branch pipelines are connected in parallel on one side of the aeration tank, a main pipe on the top is shared, the operation of each unit is controlled by a valve, and sand can be removed according to the condition of sand and mud by a single branch pipeline or different branch pipelines operate in parallel simultaneously.

4) The screw pump is positioned at the position of the main pipe after being connected in parallel, and the mud-water mixture in the sand suction unit is pumped to the vertical flow sand removal equipment through the hose.

5) The mud-sand mixture enters from an upper water inlet pipe, the flow is adjusted through a frequency converter or a valve, sand is deposited in a sand hopper according to the principle of different specific gravities, then the sand is separated out through a sand-water separator, the liquid level of the activated sludge continuously rises and flows into a water collecting tank, and then the activated sludge is converged into an aeration tank system through a return pipe, so that the sludge concentration of the system is ensured not to be reduced;

6) the invention stabilizes the operation condition, improves the operation stability and safety of the system, and ensures that the effluent stably reaches the standard;

7) the invention controls the tank capacity of the aeration tank not to be reduced any more, and improves the processing capacity of the system;

8) the invention stabilizes the air supply of the system, stabilizes the operation pressure of the fan, reduces the failure rate of the fan and prolongs the service life.

9) The method controls the risk that the system cannot run or even collapses due to excessive bottom silt of the Baileke biochemical system, and avoids the occurrence of extremely severe accidents.

In conclusion, the invention controls the mud level to not affect the swing and oxygen increasing of the aeration head under the condition of ensuring that the impermeable structure of the bottom geomembrane is not damaged, simultaneously ensures the tank capacity and the water depth along with the reduction of the mud and sand amount, and enhances the treatment capacity of the system and the mass transfer efficiency of oxygen. In addition, the aeration tank normally operates in the whole dredging process, and the production operation of a sewage plant is completely unaffected.

Drawings

FIG. 1 is a schematic diagram of the structure of a system for removing silt without emptying an aeration tank;

FIG. 2 is an enlarged view of A in FIG. 1;

FIG. 3 is an enlarged view of B in FIG. 2;

FIG. 4 is a detail view of the vertical flow sand removal device;

in the figure, a connecting hose 1, a hose control valve 1.1, a sand suction unit 2, a hollow floating plate 2.1, an adjustable channel support 2.2, a three-way pipe 2.3, a control valve 2.31, an upper suction hose 2.4, a uniform hole sand suction pipe 2.5, a sand suction hole 2.51, an external pipe 3, a screw pump 3.1, a vertical flow sand cleaning device 4, a sand cleaning tank 4.1, a support frame 4.11, a sand hopper 4.2, a diversion barrel 4.3, an annular water outlet tank 4.4, a return pipe 4.5, a sand removing machine 4.6, a reflecting plate 4.7, an emptying pipe 4.8 and an aeration tank 5.

Detailed Description

The invention is described in further detail below with reference to the figures and specific embodiments for the understanding of those skilled in the art.

As shown in figures 1-4, the system for dredging silt and sand without emptying an aeration tank is arranged on an aeration tank 5 and comprises connecting hoses 1 which are arranged on the aeration tank at intervals, each connecting hose 1 is provided with a plurality of sand suction units 2 at intervals, each sand suction unit 2 comprises a hollow floating plate 2.1 floating on the water surface of the aeration tank, an adjustable channel support 2.2 is arranged on the hollow floating plate 2.1, a three-way pipe 2.3 is arranged on the adjustable channel support 2.2, two ends of the three-way pipe 2.3 of the middle sand suction unit 2 are communicated with the connecting hoses 1, one end of the three-way pipe 2.3 of the sand suction unit 2 at the end part is communicated with the connecting hoses 1, a bottom end control valve 2.31 of the three-way pipe 2.3 is communicated with an upper suction hose 2.4, the upper suction hose 2.4 vertically penetrates through a middle hole of the hollow floating plate 2.1 downwards and extends into the bottom of the aeration tank, the lower end of the upper suction hose 2.4 is connected with a sand suction pipe 2.5 with uniform holes with two, 2.5 cm of the uniform-hole sand suction pipe from the bottom of the pool;

sand suction holes 2.51 are arranged at the bottom of the uniform hole sand suction pipe 2.5 at intervals; one end of each connecting hose 1 extends out of the aeration tank and is connected with the external pipe 3 in parallel, and a hose control valve 1.1 is arranged at the connecting end of the connecting hose 1 and the external pipe 3; the external pipe 3 is provided with a screw pump 3.1 which is integrally controlled and connected with the hose 1; the other end of the external pipe 3 is connected with a vertical flow sand removal device 4; the vertical flow sand cleaning device 4 comprises a sand cleaning tank 4.1, and a support frame 4.11 is arranged at the bottom of the sand cleaning tank 4.1; a sand hopper 4.2 is arranged at the bottom of the sand cleaning tank 4.1, and a vent pipe 4.8 is connected to the bottom of the sand hopper 4.2; a diversion barrel 4.3 is vertically arranged on the inner wall of the top of the sand cleaning tank 4.1, the diversion barrel 4.3 extends into the middle of the sand cleaning tank 4.1, the sand cleaning tank 4.1 is connected with an external pipe 3, one end of the external pipe 3 extends into the diversion barrel 4.3, and a reflecting plate 4.7 is arranged in the sand cleaning tank 4.1 below the diversion barrel 4.3; an annular water outlet groove 4.4 is arranged on the inner wall of the upper part of the sand cleaning tank 4.1, the bottom of the annular water outlet groove 4.4 is connected with a return pipe 4.5, the return pipe 4.5 extends out of the sand cleaning tank 4.1 from the tank wall of the sand cleaning tank 4.1, and the inclined wall of the sand hopper 4.2 is communicated with an inclined sand remover 4.6.

The working process of the system for removing silt and sand without emptying the aeration tank comprises the following steps:

(1) experiments prove that the lengths of the hoses in the different sand suction units 2 are different, and the pipeline equipment is installed as shown in the figure, so that the distance between the uniform hole sand suction pipes 2.5 and the bottom of the pool is 10cm, and the impermeable layer of the geomembrane is prevented from being damaged.

(2) And opening a valve of the sand suction unit and a valve of the branch pipe, filling water into the main pipe in the first operation, and starting the screw pump 3.1 to extract sand.

(3) When the sand suction unit is replaced, the valve of the target sand suction unit is opened, the previous sand suction valve is closed, the screw pump continuously operates, or different sand suction units of the same branch pipe are connected in series for suction according to the sand suction amount.

(4) When the branch pipe is replaced, the target branch pipe valve is opened, the previous branch pipe valve is closed, the screw pump extracts the mud-sand mixture, and the two branch pipe valves can be simultaneously opened for extraction at the later stage of sand suction.

(5) The flow of the silt mixture is adjusted to ensure that when the silt mixture enters the vertical flow silt removal device, the silt particles are settled, the specific gravity of the activated sludge is small, and the liquid level rises to flow into the water collecting tank and then enters the aeration system through the return pipe.

(6) After pumping for a certain time, closing the screw pump 3.1; separating sand grains in the sand hopper from the sand hopper.

Other parts not described in detail are prior art. Although the present invention has been described in detail with reference to the above embodiments, it is only a part of the embodiments of the present invention, not all of the embodiments, and other embodiments can be obtained without inventive step according to the embodiments, and the embodiments are within the scope of the present invention.

Claims (9)

1. The utility model provides a system for be used for aeration tank not clear up can desilting silt sand, the system sets up on aeration tank, its characterized in that: the sand suction device comprises connecting hoses (1) arranged on an aeration tank at intervals, a plurality of sand suction units (2) are arranged on each connecting hose (1) at intervals, each sand suction unit (2) comprises a hollow floating plate (2.1) floating on the water surface of the aeration tank, an adjustable channel support (2.2) is arranged on each hollow floating plate (2.1), a three-way pipe (2.3) is arranged on each adjustable channel support (2.2), two ends of each three-way pipe (2.3) of each middle sand suction unit (2) are communicated with the connecting hoses (1), one end of each three-way pipe (2.3) of each sand suction unit (2) at the end part is communicated with the connecting hose (1), the bottom end of each three-way pipe (2.3) is communicated with an upper suction hose (2.4), each upper suction hose (2.4) vertically penetrates through a middle hole of each hollow floating plate (2.1) downwards and extends into the bottom of the aeration tank, and the bottom of each upper suction hose (2.4) is connected with a sand suction pipe (2.5) with a sand suction hole, the bottom of the uniform hole sand suction pipe (2.5) is provided with sand suction holes (2.51) at intervals; one end of each connecting hose (1) extends out of the aeration tank and is connected with an external pipe (3) in parallel, and the other end of the external pipe (3) is connected with a vertical flow sand removal device (4).

2. The system for dredging silt and sand without emptying an aeration tank according to claim 1, wherein: the vertical flow sand cleaning device (4) comprises a sand cleaning tank (4.1), a sand hopper (4.2) is arranged at the bottom of the sand cleaning tank (4.1), a diversion barrel (4.3) is vertically arranged on the inner wall of the top of the sand cleaning tank (4.1), the diversion barrel (4.3) extends into the middle of the sand cleaning tank (4.1), the sand cleaning tank (4.1) is connected with an external pipe (3), one end of the external pipe (3) extends into the diversion barrel (4.3), an annular water outlet groove (4.4) is arranged on the inner wall of the upper part of the sand cleaning tank (4.1), a return pipe (4.5) is connected to the bottom of the annular water outlet groove (4.4), the return pipe (4.5) extends out of the sand cleaning tank (4.1) from the tank wall of the sand cleaning tank (4.1), and an inclined wall of the sand cleaning tank (4.2) is communicated with an inclined sand removing machine (4.6).

3. The system for dredging silt and sand without emptying an aeration tank according to claim 2, wherein: a reflecting plate (4.7) is arranged in the sand cleaning tank (4.1) below the diversion barrel (4.3).

4. The system for dredging silt and sand without emptying an aeration tank according to claim 2, wherein: the bottom of the sand hopper (4.2) is connected with a vent pipe (4.8).

5. The system for dredging silt and sand without emptying an aeration tank according to claim 2, wherein: the bottom of the sand cleaning tank (4.1) is provided with a support frame (4.11).

6. The system for dredging silt and sand without emptying an aeration tank according to claim 1, wherein: and a screw pump (3.1) is arranged on the external pipe (3).

7. The system for dredging silt and sand without emptying an aeration tank according to claim 1, wherein: the bottom end of the three-way pipe (2.3) is provided with a control valve (2.31).

8. The system for dredging silt and sand without emptying an aeration tank according to claim 1, wherein: the distance between the uniform hole sand suction pipe (2.5) and the bottom of the pool is 10-15 cm.

9. The system for dredging silt and sand without emptying an aeration tank according to claim 1, wherein: and a hose control valve (1.1) is arranged at the connecting end of the connecting hose (1) and the external pipe (3).

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