CN201343462Y - Unpowered siphoning type decanter - Google Patents

Abstract

The utility model relates to an unpowered siphon type decanter, which relates to a device for decanting supernatant liquid in a reaction tank in a sewage treatment plant; The supernatant in the reaction tank; the utility model unpowered siphon decanter is mainly composed of an exhaust valve (1), an exhaust pipe (2), an upper siphon pipe (3), a telescopic hose (4), a limit support ( 5), lower siphon pipe (6), buoy (7), siphon flow generating switch (8), air-holding switch (9), minimum liquid level switch (10), drain main pipe (11), maximum decanting water level (12), Composed of the lowest decanting water level (13) and the starting water level of the closed air switch (14); decanting mainly depends on gravity and siphon principle; the bottom of the lower siphon tube is designed with a U-shaped tube lower than the water outlet; the water in the U-shaped tube will never The utility model has no power consumption, low initial investment, low operating cost and strong applicability.

Description

Powerless Siphon Decanter

technical field

The utility model provides a drainage device for sewage treatment, which is mainly suitable for the drainage device in the process flow of the CASS, ICEAS, DAT-IAT method and the like of the SBR process. It belongs to the technical field of sewage treatment.

Background technique

The main pollutants of urban sewage are organic matter, so biochemical methods are mostly used at home and abroad. In the biochemical method, there are two major categories of activated sludge method and biological filter. The vast majority. There are many forms of activated sludge process, and the most widely used are three types: traditional activated sludge process, oxidation ditch, and SBR process, among which oxidation ditch and SBR process have become the preferred processes for small and medium-sized sewage treatment plants in China.

Decanter is the most commonly used key equipment in sewage treatment processes such as CASS method, SBR method and CEAS method. In the wastewater and urban sewage treatment of beer, food, beverage, pharmaceutical and other industries, the process based on CASS method has been widely used.

At present, the commonly used decanters in sewage treatment plants include screw rotary decanters, siphon decanters, and buoy decanters. The existing siphon decanter has poor control of the siphon measures, and the sealing of the underwater part is not very tight, resulting in the inability to form a siphon. At the same time, due to design reasons, it is impossible to ensure uniform decanting, and there is no effective way to control the amount of decanting.

Utility model content

The purpose of this utility model non-powered siphon decanter is to fundamentally solve the above problems. Through the exhaust valve and the liquid level control switch, the water level and flow rate of the decanted water can be strictly controlled, so that the equipment can be kept running at a constant speed during decanting, and will not Affects the activated sludge at the bottom of the reaction tank.

Technical solutions and beneficial effects

1. The utility model overcomes the fact that the decanting weir cannot follow the water level for continuous drainage when the conventional siphon decanter decants water. The utility model ensures that the water suction port of the decanter is always close to the water surface through the special structure of the upper siphon tube. At the same time as the liquid is discharged, it can change with the change of the water level of the reaction tank, and has the function of continuous drainage.

2. The design of this utility model fully considers the quantitative drainage. The upper siphon tube and air-holding switch, the siphon flow generation switch and the exhaust valve make the siphon tube drop along the water level at a uniform speed to achieve the purpose of quantitative drainage.

3. The control method of the utility model adopts the liquid level switch and the exhaust valve to control the upper and lower siphons. Thereby controlling the work of the decanter. It is easy to operate and stable in operation.

4. Corrosion-resistant rubber is used to form a flexible hose between the upper and lower siphons of the utility model, which has good corrosion resistance and sealing performance, and ensures the siphon effect.

Description of drawings

Figure 1 Structural schematic diagram of unpowered siphon decanter, 1. Exhaust valve 2. Exhaust pipe 3. Upper siphon 4. Telescopic hose 5. Limit support 6. Lower siphon 7. Float 8. Siphon flow generation switch 9 .Air-closed switch 10. Minimum liquid level switch 11. Drainage supervisor 12. Highest decanting water level 13. Minimum decanting water level 14. Start-up water level of air-holding switch

Detailed ways

According to a preferred embodiment of the structure of a non-powered siphon decanter in Fig. 1, the utility model consists of an exhaust valve (1), an exhaust pipe (2), an upper siphon pipe (3), a telescopic hose (4), a limiter Level support (5), lower siphon pipe (6), buoy (7), siphon flow generating switch (8), air-holding switch (9), minimum liquid level switch (10), drain main pipe (11), maximum decanting water level ( 12), the lowest decanting water level (13), and the start-up water level of the air-holding switch (14). One end of the exhaust pipe (2) is connected to the exhaust valve (1), the other end of the exhaust pipe (2) is connected to the upper siphon pipe (3), and the upper siphon pipe (3) is connected to the telescopic hose (4). The hose (4) has a limited support (5) on the side, and the other end of the telescopic hose (4) is connected to the buoy (7). The pipes (2) are connected, and the lower end of the drainage main pipe (11) is connected with the lower siphon pipe (6); the non-powered siphon decanter of the utility model relies on gravity and siphon principle to decant water. A section of U-shaped pipe lower than the water outlet is designed at the bottom of the lower siphon (6). When decanting water for the first time, first fill this section of U-shaped tube with water. In subsequent decanting water, because this section of U-shaped tube is lower than the water outlet, the water in the U-shaped tube will never be discharged. When the water comes from the biochemical pool, close the exhaust valve (1). When the water in the biochemical pool rises, the water in the U-shaped pipe acts as a seal, so that the air forms an air seal in the main drainage pipe (11) to prevent water from being discharged from the drain pipe. , until the raw water to be treated reaches the maximum water level. When it is necessary to decant water, the exhaust valve (1) is opened, and the gas trapped in the drain main pipe (11) is discharged from the exhaust valve (1) through the exhaust pipe (2), and the supernatant is discharged from the drain port under the action of gravity. discharge. When the water level was close to the main pipe, the gas-holding switch (9) would send a signal, the exhaust valve (1) would be closed, and the outlet water flow would form a siphon state and continue to decant water. When the water level reaches the minimum water level, the minimum liquid level switch (10) gives a signal, the exhaust valve (1) is opened again, the air intake of the exhaust pipe (2) destroys the siphon state, and the decanting stops, waiting for the next cycle.

Claims (3)

1. An unpowered siphon decanter is characterized in that it consists of an exhaust valve (1), an exhaust pipe (2), an upper siphon pipe (3), a flexible hose (4), a limit support (5), Lower siphon pipe (6), buoy (7), siphon flow generating switch (8), air-closing switch (9), minimum liquid level switch (10), drain main pipe (11), maximum decanting water level (12), minimum decanting water The water level (13) and the start water level (14) of the air-holding switch are composed; one end of the exhaust pipe (2) is connected with the exhaust valve (1), the other end of the exhaust pipe (2) is connected with the upper siphon pipe (3), and the upper siphon pipe (3) Connected with the telescopic hose (4), the side of the telescopic hose (4) has a limited support (5), the other end of the telescopic hose (4) is connected with the buoy (7), and the buoy (7) is located at the lower siphon (6) The upper part, the upper end of the drain main pipe (11) is connected with the exhaust pipe (2), the lower end of the drain main pipe (11) is connected with the lower siphon pipe (6), and the bottom of the lower siphon pipe (6) is designed with a section below the water outlet U-tube; 2. An unpowered siphon decanter as described in claim 1, characterized in that the upper siphon (3) and the lower siphon (6) are used to control the lifting of the decanter; 3. An unpowered siphon decanter as described in claim 2, characterized in that the siphon produced by the upper siphon (3) and the lower siphon (6) is mainly generated by the siphon flow switch (8), and the closed air switch (9 ), the minimum liquid level switch (10) and the exhaust valve (1) control.

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