CN215667591U

CN215667591U - Prevent oxygen filling out basin

Info

Publication number: CN215667591U
Application number: CN202120449516.XU
Authority: CN
Inventors: 杜炯; 顾潇; 李文强
Original assignee: Shanghai Municipal Engineering Design Insitute Group Co Ltd
Current assignee: Shanghai Municipal Engineering Design Insitute Group Co Ltd
Priority date: 2021-03-02
Filing date: 2021-03-02
Publication date: 2022-01-28
Anticipated expiration: 2031-03-02

Abstract

The utility model belongs to the technical field of environmental engineering, and particularly relates to an anti-aeration effluent trough which comprises an effluent trough fixed with the wall of a sedimentation tank. The utility model has the advantages of preventing the sewage from falling and oxygenating, being capable of adjusting along with the change of flow, simple structure and convenient installation and disassembly.

Description

Prevent oxygen filling out basin

Technical Field

The utility model relates to the field of water treatment equipment, in particular to an anti-aeration water outlet tank.

Background

In the sewage biochemical treatment process, dissolved oxygen in sewage can damage anaerobic and anoxic environments, and activated sludge preferentially utilizes molecular oxygen to react in the presence of the dissolved oxygen, so that denitrification reaction of denitrifying bacteria and phosphorus release of phosphorus accumulating bacteria can be hindered, and denitrification and phosphorus removal effects are poor. Therefore, before denitrification and anaerobic phosphorus release are carried out on the sewage, a large amount of dissolved oxygen is prevented from existing in the sewage or entering the sewage as much as possible.

In engineering, in order to uniformly distribute water or prevent the downstream liquid level from jacking, the free outflow of a falling weir is usually controlled. In order to ensure enough rich water head to deal with extreme conditions, the free falling height is set to be large, which causes multiple high-fall falls in the whole process. The violent dissolved oxygen rise can occur in the process of water drop, and the mechanism is as follows: the water column drives the surrounding air to form rotational flow in the falling process, the rotational flow accelerates the circulation and exchange of the air in the channel and the surrounding air, and the air and the water are fully mixed and oxygenated in an accelerating manner by the wave formed at the moment of falling sewage. And when the water quantity changes greatly, the disturbance of drop is more severe, and the oxygenation degree of drop is aggravated.

The phenomenon of drop oxygenation of sewage treatment plants in China is common, the concentration of dissolved oxygen is obviously increased (can be increased by 2-6 mg/L) after drop, the 'invalid consumption' of an internal carbon source in sewage is obvious due to oxygen-carrying sewage, and the denitrification and dephosphorization effects are not ideal. In order to solve the problems caused by drop oxygenation, the prior art means comprises:

1. the raw sewage and the return sludge enter an anaerobic zone and an anoxic zone of the biological reaction tank, and a submerged inflow mode is adopted. The submerged inflow cannot ensure the uniformity of water distribution when water needs to be distributed, and the water distribution effect is difficult to ensure.

2. And an external carbon source is supplemented in the anaerobic and anoxic tanks, so that the denitrification or dephosphorization effect is ensured, and the problem of waste of the internal carbon source caused by a large amount of dissolved oxygen in the anaerobic and anoxic zone is solved (the literature indicates that one fourth of the carbon source is inefficiently consumed due to drop oxygenation). This results in very large consumption of the chemicals and high operating costs.

At present, with the introduction of policies such as national great protection of Yangtze river, great protection of yellow river and the like, the effluent execution standard of a sewage treatment plant is stricter, the advanced treatment process flow of the sewage treatment plant usually has a denitrification requirement, namely, the advanced denitrification treatment processes such as a denitrification biological filter, an active sand filter, a deep bed filter and the like are adopted behind a secondary sedimentation tank, the influence of dissolved oxygen on subsequent denitrification is obvious, and the dissolved oxygen generated by the effluent of the secondary sedimentation tank needs to be controlled urgently. The secondary sedimentation tank generally falls through the water outlet weir to discharge water, the dissolved oxygen is greatly increased in the water falling process, and the dissolved oxygen in the water outlet channel can be as high as about 4mg/L, so the dissolved oxygen generated in the water discharging process of the sedimentation tank needs to be controlled. The domestic research on the anti-aeration water outlet tank is rarely reported.

The utility model discloses a noise-reducing, oxygen-filling-preventing and algae-preventing cover plate in Chinese patent document (application publication No. CN108648744A, published 2018, 10 and 12), and discloses a noise-reducing, oxygen-filling-preventing and algae-preventing cover plate. The sound insulation plate is used as a cover plate shell, a damping layer is pasted between the absorbing material positioned in the sound insulation plate and the sound insulation plate, the damping layer is completely attached to the inner surface of the sound insulation plate to form a free damping layer, and noise and dissolved oxygen generated by water falling of the sedimentation tank are reduced. The patent focuses on reducing noise generated by water drop, and the oxygenation problem caused by water drop cannot be completely solved only by arranging the cover plate.

The Chinese patent document "a structure for preventing sewage from falling and oxygenating" (application publication No. CN209396977U, published as 2019, 09 and 17), discloses a structure for preventing sewage from falling and oxygenating, wherein a plurality of water outlet holes are formed in the bottom of a water outlet weir, a guide tube is connected below each water outlet hole, and sewage, supernatant and return sludge entering a biological selection tank are all guided below the liquid level to prevent the falling and oxygenating. The patent is suitable for the anti-drop oxygenation of the sludge effluent and is not suitable for a sewage effluent tank.

Therefore, aiming at the application range of the existing anti-aeration water outlet tank, the equipment for developing the anti-aeration water outlet tank for the effluent of the sedimentation tank in a targeted manner is a practical work, and can prevent the dissolved oxygen of the sewage from increasing in the water drop process after the sewage turns over the weir crest, thereby obviously improving the nitrogen and phosphorus removal efficiency, reducing the adding amount of external carbon source agents and greatly reducing the operation cost.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an anti-oxygenation effluent trough which is arranged at the downstream of an effluent weir, effluent flows out of the effluent trough along an inner channel through an inner side guide plate, the effect of avoiding oxygenation under the condition of free outflow is not influenced, the anti-oxygenation effluent trough can be automatically adjusted along with flow change, the structure is simple, the assembly and disassembly are convenient, and the anti-oxygenation effluent trough can be widely applied to the water treatment industry.

In order to achieve the purpose, the technical scheme of the utility model is as follows:

the utility model provides an anti-oxygen-filling goes out basin, includes the play basin of fixing with the sedimentation tank wall, and the mill weir is installed to the drop side in its characterized in that play basin, goes out the basin inboard and establishes the guide plate, the guide plate is located go out the drop side of mill weir, is connected through adjustable bolt connector between guide plate and the play basin, forms the play water passageway with play basin inner space intercommunication between guide plate and play basin lateral wall.

Further, the guide plate includes vertical guide plate, adopt adjustable bolt connector to link to each other between vertical guide plate and the play basin, vertical guide plate upper end flushes or slightly hangs down with play weir top, and the lower extreme downwardly extending is below the liquid level, vertical guide plate lower extreme links to each other with side direction guide plate upper end, adopts adjustable bolt connector to vertically link to each other between side direction guide plate lower extreme and the play basin. The distance between the vertical guide plate and the distance between the lateral guide plate and the water outlet groove can be adjusted through the adjustable bolt connectors along with the change of the flow.

The water outlet weir is connected with the water outlet groove through a bolt, and the water outlet weir is provided with an adjustable strip bolt hole for adjusting the height of the water outlet weir.

The sedimentation tank is provided with an effluent weir, the effluent trough is arranged at the downstream of the effluent weir of the sedimentation tank, and the tail end of the effluent trough is connected with an effluent channel of the sedimentation tank.

The water outlet groove is arranged at the water falling side of the water outlet weir, and the water flow forms a water passing weir when crossing over, so as to control the water level in front of the weir or achieve the purpose of water distribution.

The water outlet weir is any one of a concrete fixed weir, a stainless steel weir plate, an adjustable weir gate and a water through hole.

After the effluent in the sedimentation tank crosses the effluent weir, the effluent falls into the effluent trough along the effluent channel between the guide plate and the side wall of the effluent trough, so that the concentration of dissolved oxygen is prevented from rising in the water falling process. Compared with the prior art, the utility model has the following advantages:

1. the sewage is prevented from convection with air in the free falling process, water column and liquid level are prevented from being violently collided to generate water and air mixing, the oxygen filling prevention effect is good, the nitrogen and phosphorus removal reaction efficiency can be improved, and the medicament cost of adding an external carbon source is reduced.

2. The sewage treatment device can be automatically adjusted along with the sewage quantity, and has a large variation range of applicable water quantity and a wide application range;

3. simple structure is light and handy, reasonable in design, and the installation of being convenient for and dismantlement all can use on newly-built and transformation project.

Drawings

FIG. 1 is a schematic cross-sectional view of the present invention;

FIG. 2 is a perspective view of the present invention;

FIG. 3 is a schematic view of an effluent weir plate;

the figure includes: the water outlet weir comprises a water outlet weir 1, a transverse adjustable bolt connector 2, bolts 3, a water outlet groove 4, a vertical guide plate 5, a lateral guide plate 6, a vertical adjustable bolt connector 7 and a strip-shaped bolt hole 8.

Detailed Description

The present invention will now be further described by way of the following detailed description of a preferred embodiment thereof, taken in conjunction with the accompanying drawings.

As shown in figures 1, 2 and 3, the effluent weir 1 is arranged at the water falling side of the effluent trough 4 and forms a water passing weir when the water flow turns over so as to control the water level in front of the weir or achieve the purpose of water distribution. It is characterized in that the anti-oxygen-filling device comprises:

as shown in fig. 1 and 2, the effluent weir 1 is vertically connected with the effluent trough 4 through bolts 3; and the vertical guide plate 5 is positioned on the water falling side of the water outlet weir 1, one end of the vertical guide plate 5 is flush with or slightly lower than the top of the water outlet weir, and the vertical guide plate 5 is transversely connected with the water outlet groove 4 by adopting a transverse adjustable bolt connector 2 and is used for carrying sewage. The vertical guide plate 5 extends downwards to the position below the liquid level, and the lower end of the vertical guide plate is connected with the lateral guide plate 6.

As shown in fig. 1 and 2, the upper part of the lateral guide plate 6 is connected with the vertical guide plate 5, and the lower part is vertically connected with the water outlet tank 4 by adopting a vertical adjustable bolt connector 7; the tail end of the water outlet groove 4 is connected with a water outlet channel of the sedimentation tank.

The water outlet groove is fixed with the wall of the sedimentation tank, and a water outlet weir is arranged on the inner side of the water outlet groove. The effluent weir is provided with an adjustable strip bolt hole 8 for adjusting the height of the effluent weir

The adjustable bolt connector between the vertical guide plate and the water outlet groove can be automatically adjusted along with the change of flow.

Vertical guide plate 5 adopts horizontal adjustable bolted connection 2 to link to each other with play basin 4, vertical guide plate 5 downwardly extending is below the liquid level, and the lower extreme links to each other with side direction guide plate 6, and 6 upper portions of side direction guide plate link to each other with vertical guide plate 5, and the lower part adopts vertical adjustable bolted connection 7 to vertically link to each other with play basin 4.

The water outlet weir can be any one of a concrete fixed weir, a stainless steel weir plate, an adjustable weir gate and a water through hole.

When the water yield changes, because under the effect of adjustable bolted connection ware, keep laminating and can change thereupon with the rivers surface all the time, can not cause the drainage not smooth, avoid falling freely and produce the top support, can not take place the uneven problem of water distribution.

By arranging the anti-aeration device, the utility model can prevent the dissolved oxygen in the water drop process from increasing after the sewage turns over the weir crest, thereby obviously improving the nitrogen and phosphorus removal efficiency, reducing the dosage of external carbon source agents and greatly reducing the operation cost.

While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the utility model. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the utility model should be determined from the following claims.

Claims

1. The utility model provides an anti-oxygen-filling goes out basin, includes the play basin of fixing with the sedimentation tank wall, and the mill weir is installed to the drop side in its characterized in that play basin, goes out the basin inboard and establishes the guide plate, the guide plate is located go out the drop side of mill weir, is connected through adjustable bolt connector between guide plate and the play basin, forms the play water passageway with play basin inner space intercommunication between guide plate and play basin lateral wall.

2. The anti-aeration water outlet tank as claimed in claim 1, wherein: the guide plate includes vertical guide plate, adopt adjustable bolt connector to link to each other between vertical guide plate and the play basin, vertical guide plate upper end flushes or slightly hangs down with play weir top, and the lower extreme downwardly extending is below the liquid level, vertical guide plate lower extreme links to each other with side direction guide plate upper end, adopts adjustable bolt connector to vertically link to each other between side direction guide plate lower extreme and the play basin.

3. The anti-aeration water outlet tank as claimed in claim 1, wherein: the water outlet weir is connected with the water outlet groove through a bolt, and the water outlet weir is provided with an adjustable strip bolt hole for adjusting the height of the water outlet weir.

4. The anti-aeration water outlet tank as claimed in claim 1, wherein: the tail end of the water outlet groove is connected with a water outlet channel of the sedimentation tank.

5. The anti-aeration water outlet tank as claimed in claim 1, wherein: the water outlet weir is any one of a concrete fixed weir, a stainless steel weir plate, an adjustable weir gate and a water through hole.