CN211170015U

CN211170015U - Double-layer horizontal flow sedimentation tank

Info

Publication number: CN211170015U
Application number: CN201921859213.4U
Authority: CN
Inventors: 周易
Original assignee: Shanghai Water Industry Design Engineering Co ltd
Current assignee: Shanghai Water Industry Design Engineering Co ltd
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2020-08-04
Anticipated expiration: 2029-10-31

Abstract

The utility model discloses a double-deck advection sedimentation tank, including the mixed district of intaking that sets gradually, flocculation district, water distribution area, sedimentation zone, its characterized in that sedimentation zone adopts the bilayer to arrange, divide into upper sedimentation zone and lower floor's sedimentation zone, and double-deck sedimentation zone is terminal to be kept apart, makes the unable mutual influence of rivers between the double-deck sedimentation zone, connects the perforated pipe respectively in the terminal top of upper sedimentation zone and lower floor's sedimentation zone, forms out the water zone, and the rear in water zone is established out the well, and the whole perforated pipes of each layer sedimentation tank of outlet well intercommunication guarantee that the outlet well water level is higher than the at least 20cm of highest perforated pipe crest. The utility model discloses a totally enclosed of each layer sedimentation tank avoids each layer sedimentation tank rivers mutual interference, has improved the treatment effect and the operating stability of double-deck advection sedimentation tank. The effluent pressure difference can be consistent by utilizing each layer to independently submerge the effluent, the flow of each layer of sedimentation tank is ensured to be the same, and the unfavorable condition that the flow of each layer of sedimentation tank is not uniform caused by short flow is avoided.

Description

Double-layer horizontal flow sedimentation tank

Technical Field

The utility model relates to a double-deck advection sedimentation tank. The pool type is mainly applied to a water treatment sedimentation process, and the sedimentation efficiency is improved and the occupied area is saved by arranging the upper and lower parallel double-layer sedimentation areas.

Background

Horizontal sedimentation tanks are one of the commonly used tank types in water treatment plants. The horizontal sedimentation tank has simple structure, convenient operation and management, strong adaptability to water quality and water quantity change and high effluent water quality guarantee rate, is one of the accepted sedimentation tank types with the best stability, is particularly suitable for large-scale centralized water supply plants in cities, and is particularly suitable for the first and second-line cities with dense population. However, the horizontal sedimentation tank has disadvantages such as a large floor space. Under the general condition, the floor area of the horizontal sedimentation tank is several times of that of the inclined tube sedimentation tank, and the indexes of the construction land of the densely-populated second-line city and first-line city are quite tight, so that the popularization and the use of the horizontal sedimentation tank in the cities are greatly limited.

Aiming at the problem that the floor area of the horizontal sedimentation tank is large, a double-layer horizontal sedimentation tank is used in some projects. The double-layer horizontal sedimentation tank can improve the sedimentation efficiency and reduce the occupied area, but the actual operation effect after the sedimentation tank is built is poor. The water inlet and outlet mode and the sludge discharge mode of the double-layer horizontal sedimentation tank are greatly different from those of a common single-layer horizontal sedimentation tank, and the detail design is easy to cause problems, so that the sedimentation effect is influenced during operation, and finally the effluent quality of the sedimentation tank is unstable. The design is essentially caused by the fact that the double-layer sedimentation tank is designed by adopting the inertia thinking of the single-layer sedimentation tank, so that how to discover and solve the design defects becomes the key for overcoming the operation stability of the double-layer sedimentation tank.

The traditional double-layer horizontal flow sedimentation tank is mainly divided into a series connection type and a parallel connection type. The series connection is that raw water enters through one side of a lower-layer sedimentation tank, the water flow direction is reversed from the other side of the lower-layer sedimentation tank, the raw water enters into an upper-layer sedimentation tank, and finally the raw water flows out through the upper-layer sedimentation tank. The parallel connection is that the raw water is evenly distributed to the upper and lower layers of sedimentation tanks, and the water flows to the tail end and then is discharged through a water surface water outlet groove or a water outlet pipe. No matter the sedimentation tank is connected in series or in parallel, the traditional double-layer horizontal flow sedimentation tank can not avoid the mode of water surface outlet, thereby causing the mutual disturbance of each layer of sedimentation tank and influencing the sedimentation effect of flocs.

In order to solve the problem, a double-layer horizontal sedimentation tank needs to be researched, and the design defects of the current double-layer horizontal sedimentation tank are overcome by thoroughly changing the sedimentation mode and the water inlet and outlet mode of the horizontal sedimentation tank, so that the treatment effect and the operation stability of the double-layer horizontal sedimentation tank are fundamentally improved.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a double-deck advection sedimentation tank through the optimization to sedimentation tank sedimentation mode and business turn over water mode, has improved double-deck advection sedimentation tank's treatment effect and operating stability.

In order to realize the purpose, the technical scheme of the utility model is that: the utility model provides a double-deck advection sedimentation tank, including the mixed district that intakes that sets gradually, the flocculation district, join in marriage the water zone, the sedimentation zone, its characterized in that sedimentation zone adopts the bilayer to arrange, divide into upper sedimentation zone and lower floor sedimentation zone, connect the perforated pipe respectively in the terminal top in upper sedimentation zone and lower floor sedimentation zone, form out the water zone, the rear in water zone is established out the water well, the whole perforated pipe in each layer sedimentation tank of outlet well intercommunication, guarantee that the outlet well water level is higher than the top of the tube of the highest perforated pipe by at least 20cm, the terminal complete isolation in double-deck sedimentation zone makes the unable mutual influence of rivers between the double-deck sedimentation zone, thereby the whole sedimentation effect of sedimentation zone floc has been improved.

Furthermore, the depth of water in each layer of sedimentation tank is 2.5-3.5 m, each layer of sedimentation tank comprises a plurality of single-lattice sedimentation tanks, the width of each single-lattice sedimentation tank is 8-12 m, and the length of each single-lattice sedimentation tank is 40-60 m.

Furthermore, the perforated pipe is a steel pipe or a stainless steel pipe with DN 300-DN 500, the diameter of the perforated pipe is 20 mm-30 mm, the perforated pipe is perforated on two sides, the distance between the perforated pipe and the perforated pipe is 10 cm-30 cm, the angle of the perforated pipe and the horizontal direction are α degrees in the inclined direction, and the angle of the perforated pipe is α degrees-45 degrees.

Furthermore, a water outlet weir is arranged in the water outlet well, a water outlet channel is connected behind the water outlet weir, a stirrer is arranged in front of the water outlet channel, and the treatment effect of the subsequent treatment structure is improved through a micro-flocculation process.

Furthermore, a grid flocculation tank is adopted in the flocculation area, and a perforated wall is adopted in the water distribution area, so that the uniformity of water distribution is realized.

The utility model discloses a double-deck advection sedimentation tank can realize that each layer advection sedimentation tank is in the settling zone and the complete isolation of play pool, avoids the influence of each other during each regional operation, has promoted whole play water effect. The completely independent water outlet system can realize completely independent operation of each layer of sedimentation tank, and has the main effects that water is discharged from each layer of sedimentation tank through the perforated pipes, and the water outlet weir is arranged behind the water outlet pipe, so that the water outlet pressure of the perforated pipes of each layer of sedimentation tank is the same, the water inlet and outlet quantity of each layer of sedimentation tank is the same, and the phenomenon of uneven water distribution caused by short flow in the parallel double-layer horizontal flow sedimentation tank with uniform water outlet on the water surface is avoided. Compared with the common horizontal sedimentation tank, the parallel double-layer horizontal sedimentation tank can save half of the floor area, optimizes the flow state at the water outlet tank or the water outlet pipe and improves the quality of the outlet water.

Drawings

Fig. 1 is a plan view of the upper layer of a double-layer horizontal flow sedimentation tank.

Fig. 2 is a plan view of the lower layer of a double-layer horizontal flow sedimentation tank.

Fig. 3 is a cross-sectional view of a double-layer horizontal flow sedimentation tank a-a.

Fig. 4 is a sectional view of a double-layer horizontal flow sedimentation tank B-B.

Fig. 5 is a cross-sectional view of a double-layer horizontal flow sedimentation tank C-C.

Detailed Description

The invention is further described with reference to the following figures and examples.

The embodiment of the utility model relates to a double-deck advection sedimentation tank, it mainly includes into water mixing area, flocculation area, distribution of water district, settling zone, play pool etc.. Wherein, the water inlet adopts pipeline water inlet, the added coagulant is evenly mixed with the raw water through a pipeline mixer, and a mechanical mixing process of a stirring paddle can also be adopted. The flocculation area adopts a grid flocculation process, and can also adopt other hydraulic flocculation processes such as a folded plate flocculation process and the like. The water distribution area adopts a perforated tracery wall and can also adopt a natural water distribution mode without facilities. The sedimentation zone adopts a multilayer sedimentation zone with a completely closed tail end, so that the water flow in each layer of sedimentation zone can be ensured to completely and independently run, and mutual influence is avoided. The water outlet area adopts a submerged perforated pipe to discharge water, and a water outlet well is arranged at a water outlet and is finally communicated with a subsequent treatment structure.

As shown in the figure, the utility model discloses double-deck advection sedimentation tank mainly realizes each layer sedimentation region's complete independence by each layer sedimentation tank independent water outlet system, has avoided the interact of each layer sedimentation tank when moving.

The water inlet mixing area 1 mainly comprises a water inlet pipe and a mixing device and has the main function of mixing the inlet water and the coagulant. Wherein the inlet tube sets up pipe fittings such as maintenance valve usually, and the pipe diameter is confirmed according to the water yield, is DN800~ DN1200 usually, and it is about 2.5~10 ten thousand meters to correspond to the highest daily water yield³And d. The mixing device can adopt a pipeline mixer as shown in the figure, and can also be additionally provided with a mixing pool and a mechanical mixing device.

The flocculation area 2 mainly aims to realize that flocs are changed from small to large through hydraulic or mechanical flocculation so as to improve the sedimentation performance of the flocs. If the figure adopts a grid flocculation tank, other hydraulic flocculation processes such as folded plate flocculation and the like can also be adopted.

The mode that the water distribution area 3 adopts is mainly confirmed according to flocculation technology effluent homogeneity. If the pattern flocculation process adopts grid flocculation, the water outlet is not uniform, and the water distribution uniformity is realized by adopting a perforated tracery wall. If the water discharged by the flocculation process is uniform, water distribution facilities are not suitable, and water is naturally distributed to each layer of sedimentation area.

The sedimentation zone 4 is arranged in a double-layer mode, and the water depth of a single-layer sedimentation tank is 2.5-3.5 m. The width of the single-lattice sedimentation tank is generally 8-12 m, and the length of the single-lattice sedimentation tank is 40-60 m. The tail ends of the double-layer settling zones are completely isolated, so that water flows between the double-layer settling zones cannot influence each other, and the overall settling effect of flocs in the settling zones is improved.

The perforated pipe 5 is a steel pipe or a stainless steel pipe with DN 300-DN 500, the diameter of the perforated pipe is 20 mm-30 mm, the perforated pipe is perforated on both sides, the spacing between the perforated pipes is usually 10 cm-30 cm, the angle of the perforated pipe and the horizontal direction are α degrees in the inclined direction, and the angle of the perforated pipe α is 0-45 degrees.

And the water outlet well 6 is communicated with all the perforated pipes 5 of each layer of sedimentation tank, and the water level of the water outlet well is ensured to be at least 20cm higher than the top of the highest perforated pipe. The designed flow velocity in the water outlet well 6 is less than 0.5 m/s. The water outlet system adopts the submerged perforated pipes to discharge water, so that the pressure difference of the perforated pipes at each layer is the same, and the water quantity of the sedimentation tanks at each layer is ensured to be the same.

And the water outlet channel 7 is connected with the water outlet well 6 and conveys the effluent of the sedimentation tank to a next-stage treatment structure. A stirrer can be arranged before the water outlet channel as shown in the figure, and the treatment effect of the subsequent treatment structure is improved through the micro-flocculation process.

It is distinguished from the prior art in that:

1. compare traditional double-deck advection sedimentation tank, the utility model discloses the pond type has utilized perforated pipe to go out water and has realized the independent play water of each settling zone, and it is big to have avoided the unified surface of water play water of traditional double-deck advection sedimentation tank to cause out water area, and each layer sedimentation tank rivers are mixed phenomenons such as together.

2. Compare in traditional double-deck advection sedimentation tank, the utility model discloses the pool type has used out the mill weir, submerges each layer perforated pipe, and it is the same to have guaranteed that each layer highly different outlet pipe goes out the water pressure differential, can realize that each layer sedimentation tank goes out the water flow the same, has avoided traditional advection sedimentation tank because the inhomogeneous unfavorable phenomenon of each layer water yield that the circumstances such as short-term current caused.

3. Compare in the characteristics that traditional double-deck advection sedimentation tank goes out the weir levelness and requires highly, the utility model discloses the requirement that outlet pipe installation roughness was flooded to the pond type is not high, the inhomogeneous phenomenon of single play weir that the effluent weir levelness inconsistent caused can not appear.

4. Compare in traditional double-deck advection sedimentation tank, the utility model discloses the pool type has less area, better play water quality of water.

Claims

1. The utility model provides a double-deck advection sedimentation tank, including the mixed district that intakes that sets gradually, the flocculation district, join in marriage the water zone, the sedimentation zone, its characterized in that sedimentation zone adopts the bilayer to arrange, divide into upper sedimentation zone and lower floor's sedimentation zone, the terminal isolation of double-deck sedimentation zone makes the unable mutual influence of rivers between the double-deck sedimentation zone, connect the perforated pipe respectively in the terminal top of upper sedimentation zone and lower floor's sedimentation zone, form out the water zone, the rear in play water zone is established out the water well, the whole perforated pipes in each layer sedimentation tank of outlet well intercommunication, guarantee that the outlet well water level is higher than the highest perforated pipe crest at least 20 cm.

2. The double-layer horizontal flow sedimentation tank of claim 1, wherein the water depth of each layer of sedimentation tank is 2.5-3.5 m, each layer of sedimentation tank comprises a plurality of single-lattice sedimentation tanks, the width of each single-lattice sedimentation tank is 8-12 m, and the length of each single-lattice sedimentation tank is 40-60 m.

3. The double-layer horizontal flow sedimentation tank as claimed in claim 1, wherein the outlet well is internally provided with an outlet weir, the rear part of the outlet weir is connected with an outlet channel, a stirrer is arranged in front of the outlet channel, and the treatment effect of a subsequent treatment structure is improved through a micro-flocculation process.

4. The double-layer horizontal flow sedimentation tank of claim 1, wherein the flocculation zone adopts a grid flocculation tank, and the water distribution zone adopts perforated walls to realize the uniformity of water distribution.