Design and Selection of Pressurized Sewage Discharge Equipment in Basement?

For the design of sewage lifting and discharging equipment with toilet in basement, the flow, lift and volume are calculated according to Code for Design of Water Supply and Drainage in Buildings (GB500 15). Article 4.7.8 shall consider the effective volume of the equipment. That is, the effective volume of the water collecting tank (water collecting tank) is not less than the maximum displacement of a water pump for 5 minutes.

Types and comparison of sewage discharge facilities in basement toilets;

A, sump (water tank)

Technical background: Functionalization and commercialization of basements make it necessary to set toilets as ancillary facilities.

Design concept: 1, the volume meets a certain water regulation function, which is 3-5 times that of the drainage pipeline (200-500L).

2. The depth of the sump meets the space requirements for convenient dirt collection (5%) and unconventional dirt with light density such as sanitary napkins.

3, super high, meet the (2-3 minutes design discharge space) accident maintenance time.

Implementation type: 1. The effective volume of the toilet sump is not less than the maximum flow of the drainage pump for 5 minutes.

2. The effective height shall not be less than 1 m..

3, sump superelevation is not less than 0.5 meters.

Design defect: "Check valve is not suitable for conveying liquid containing solid particles and high viscosity"-the applicable condition of check valve.

Technical defects: The pump has limited flow capacity, and it is easy to block when the nature, quality and scale of actual sewage do not meet the design requirements.

Applicable place: poor economic conditions and no commercial office facilities around the cesspit. Good ventilation effect.

Practical experience: the volume of the traditional cesspit is 2-6 times larger than the minimum volume required by the design. 10-30min discharge.

Technical points: By setting a large-volume cesspit, water regulation, accident maintenance and accident drainage can be ensured.

Technical regret: the cleaning method is unacceptable, the sanitary conditions are extremely poor, and it is easy to get stuck.

Second, the filter backwashing type:

Technical background: "The sewage in the sump is easy to block and damage the pump, and the traditional sump cleaning process is unacceptable."

Design concept: the sewage lifting pump has no blockage, no cleaning and no back discharge.

Implementation type: 1. A filter screen is added in front of the water pump, and when the sewage is discharged under pressure, it passes through the filter screen in the opposite direction to play a backwashing role; Filtration-backwashing

2. When the inlet check valve is blocked, a nozzle (with a filter screen) is arranged in front of the check valve to connect with the water tank. When there is backflow, it will be discharged back to the water tank according to the pressure.

Design defects: 1, water inlet and water outlet (filtration-backwashing) * * * use the same section of pipeline, and there is backflow problem. (especially the toilet sewage collection and discharge system)

2. "Check valves are not suitable for conveying liquids containing solid particles and high viscosity"-the applicable conditions of check valves.

Practical experience: 1. Check valves should not transport hard and unconventional sundries such as mobile phones, key chains, coins, long fibers, construction waste and water bottles.

2. Backwater drainage. The filter screen on the backwater drain pipe, like the pipe diameter, is easily blocked by pollutants such as sanitary napkins, causing backwater to go up, which is counterproductive.

Applicable conditions: it should be used in units with perfect property management, controllable personnel and high personnel quality-that is, it is suitable for employees in internal units.

It should not be used in crowded public places (supermarkets, gymnasiums, vegetable markets, entertainment places, restaurants, cinemas, halls and exhibition halls, etc.). )

Technical key: solving the overflow capacity of water pump.

Technical regret: the check valve has product design defects. The equipment has waterproof problems and does not have emergency drainage capacity.

Three, Hengrui HRWS sewage pressure discharge equipment:

Technical background: The technology of cesspit is relatively backward (environmental protection, intelligence and automation), there is backwashing problem in filtration, and the check valve has product design defects and does not have the ability of "emergency drainage".

Design concept: no backflow, no blockage (sewage lifting pump, check valve), no cleaning (intercepting water collecting tank), energy saving, safety, stability, hygiene and easy maintenance.

Implementation type: 1. The water outlet pipe of the pump is set separately, and it is not connected with the water inlet pipe (the inlet and outlet pipes do not share the same pipe), so there is no water pouring.

2, non-blocking design, equipped with filter isolation device. The sewage lifted by the pump through the check valve and gate valve and finally discharged to the designated place is treated to achieve the actual overflow capacity.

3. There is a self-flushing pipe in the intercepting water collecting tank, so there is no fine dirt deposition and no need to clean it.

4. Energy-saving, which can meet the discharge under the condition of meeting the flow and lift, while the traditional cesspit needs to meet the large-channel pump cavity of sewage (it is difficult to choose a small-caliber low-power pump).

5. The safe and stable (1) water tank meets the effective volume requirement of sewage pit in zhongwei Health Center in Code for Design of Building Water Supply and Drainage. Solve the problems of uneven water quantity and excessive instantaneous water quantity.

(2) It has the ability of continuous operation of the pump group at the same time. It has emergency drainage capacity under special circumstances.

⑶ Three risks of check valve: "Check valve with reliable quality should be set at the outlet of water pump"-water supply and drainage design of building.

① Pre-filtering isolation device

(2) It has the ability to automatically start two pumps at the same time in case of damage.

(3) The valve plate of check valve adopts detachable design, with excellent comprehensive quality. According to the service life, it should be replaced regularly-see the instruction manual.

(4) No reflux.

5] Strict implementation: regular mandatory replacement of check valves, regular routine maintenance of water pumps and other equipment parts maintenance publicity.

6. Sanitary. (1) There is a self-flushing pipeline in the water collecting tank, and there is no dirt deposition, so cleaning is not required.

⑵ Filter the dirt in the isolation device: mobile phones, key chains, coins, knives, construction waste, water bottles, etc. The slag discharge port has automatic slag discharge design, which is more convenient and sanitary than the traditional cleaning type. Compared with the filter backwashing equipment, the overall maintenance of the equipment is extremely small, which is much higher than the maintenance level of the filter backwashing equipment.

7. Convenient maintenance: (1) The water collecting tank is equipped with a self-flushing pipe, and the inside of the water collecting tank is free from cleaning. (2) The check valve will not cause trouble. (3) The effective volume is appropriate.

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Technical key: The problem of water pump, especially "check valve blocking", is solved by setting the filter isolation device.