submersible jet aerator

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QSB submersible jet aerator is a wastewater device that aerates the aeration tank, and is a type of aeration device in the wastewater activated sludge biological treatment system. The mud and water mixture is pumped into the nozzle of the jet aerator by a water pump and sprayed out at high speed. In the jet aerator, the oxygen transfer process is achieved by mixing compressed air (or air directly sucked in) with the mud and water mixture around the nozzle of the jet aerator and vigorously stirring it in the roaring tube. The bubbles are crushed into a mist, and then in the diffusion tube, the velocity head becomes the pressure head, and the fine bubbles are further compressed, and oxygen is quickly transferred to the mixed liquid, Thus, the oxygen transfer process is strengthened, and the oxygen transfer efficiency can be increased to over 30-35%.

The QSB submersible jet aerator is used in the aeration tank and sand settling tank of sewage treatment plants to oxygenate and mix the mixed liquid of sewage sludge, as well as to biochemical treat sewage or increase oxygen in aquaculture ponds. The intake volume is 10-100 cubic meters per hour, with an oxygenation capacity of 0.35-8.20 kilograms of oxygen per hour, and a motor power of 0.75-22 kW.

Features

1. Self repositioning, easy installation, and can be freely arranged without interrupting process operation

2. Compact design structure, utilizing self priming function without the need for external air source;

3. Host diving operations reduce floor space and reduce noise;

4. It can be directly used in oxidation ponds, saving infrastructure costs;

5. An independently movable aeration device that also has a stirring function during aeration;

6. The chassis can be specially designed according to user requirements.

7. Underwater motors using submersible motor sealing technology;

8. The impeller is directly connected to the motor, with a simple structure, high efficiency, and long service life;

9. A mesh water inlet can be added to avoid unnecessary damage caused by foreign objects entering the body;

10. The intake volume can be adjusted through the intake valve;

11. Except for the motor, other component materials include stainless steel, carbon steel, and cast iron for selection.

Working principle

The QSB submersible jet aerator uses the water generated by the submersible pump to form high-speed water flow through the nozzle, forming negative pressure air around the nozzle. After mixing with the water flow in the mixing chamber, a water air mixed flow is generated in the horn shaped diffusion tube, which is sprayed out at high speed. The water flow with many bubbles is vortex stirred in a large area and depth of water to complete aeration. And its shaft power does not change with the depth of submergence, and the intake volume can be adjusted. Because of this, submersible jet aerators can be applied in pools with significant changes in water level. Due to the strong water jet, effective water circulation occurs, causing the air to be sheared into a large number of tiny bubbles. It has increased its surface area, and due to the slow rise of bubbles, a large amount of oxygen in the air is dissolved in water, making this power efficiency superior to other types of aerators.

Application

The QSB submersible jet aerator is used in various sewage treatment projects for aeration tanks, aeration sand settling tanks, pre aeration tanks, aerobic nitrification tanks, aeration and oxygenation mixing, and aquaculture pond oxygenation in biochemical treatment processes.

How to choose a submersible jet aerator

It is recommended to consider five aspects, including liquid conveying capacity, head, liquid properties, pipeline layout, and operating conditions.

1. Flow rate is one of the important performance data for selecting jet aerators, which directly affects the production capacity and conveying capacity of the entire device. If the design process can calculate the normal, small, and large flow rates of the centrifugal aerator. When selecting a centrifugal aerator, the ideal flow rate should be taken as the basis, taking into account the normal flow rate. When there is no ideal flow rate, 1.1 times the normal flow rate is usually taken as the ideal flow rate.

2. Head is another important performance data for selecting jet aerators, and it is generally selected by amplifying the head by 5-10% margin.

3. Liquid properties, including the name of the liquid medium, physical properties, chemical properties, and other properties, include temperature c, density d, viscosity u, solid particle diameter in the medium, and gas content. This involves the head of the system, effective cavitation margin calculation, and the appropriate pump type: chemical properties, mainly referring to the chemical corrosiveness and toxicity of the liquid medium, are an important basis for selecting pump materials and selecting the type of shaft seal.

4. The pipeline layout conditions refer to the height of the liquid delivery, the distance from the liquid delivery direction, the data such as the lower liquid level on the suction side and the higher liquid level on the discharge side, as well as the pipeline specifications and their lengths, materials, pipe fittings specifications, quantities, etc., in order to calculate the system head and verify the cavitation margin.

5. There are many contents of operating conditions, such as liquid operation T, saturated steam force P, suction side pressure PS, discharge side container pressure PZ, altitude, whether the ambient temperature operation is intermittent or continuous, and whether the pump position is fixed or movable

Installation

1. Under geographical conditions, the water pump should be as close as possible to the water source to reduce the length of the suction pipe. The foundation at the installation site of the water pump should be firm, and a dedicated foundation should be built for fixed pump stations.

2. The inlet pipeline should be sealed reliably and must have dedicated support, and cannot be hung on the water pump. The inlet pipe equipped with a bottom valve should be installed as vertically as possible with the axis of the bottom valve and the horizontal plane, and the angle between the axis and the horizontal plane should not be less than 45 °. When the water source is a channel, the bottom valve should be at least 0.50 meters above the bottom of the water, and a mesh should be added to prevent debris from entering the pump.

3. The base of the machine and pump should be horizontal and firmly connected to the foundation. When the machine and pump belts are driven, the tight edge of the belt should be placed downwards, resulting in high transmission efficiency. The rotation of the water pump impeller should be consistent with the direction indicated by the arrow; When using coupling transmission, the machine and pump must be on the same axis.

4. The installation position of the water pump should meet the requirement of allowing vacuum suction height, and the foundation must be horizontal and stable to ensure that the rotation direction of the power machinery is consistent with the rotation direction of the water pump.

If there are multiple units in the same computer room, there should be a distance of over 800mm between the units and between the units and the walls.

6. The water pump suction pipe must be well sealed and minimize bends and gate valves. When filling water, air should be discharged completely. During operation, there should be no accumulation of air in the pipe. It is required that the suction pipe is slightly inclined upward and connected to the water pump inlet, and the inlet should have a certain submergence depth.

Notes

1. If there is any minor malfunction in the water pump, remember not to let it work. If the packing of the water pump shaft is worn out and needs to be added in a timely manner, if the water pump continues to be used, it will leak air. The direct impact of this is that the energy consumption of the motor increases, which in turn can damage the impeller.

If the water pump experiences strong vibration during use, it is necessary to stop and check the cause, otherwise it may also cause damage to the water pump.

When the bottom valve of the water pump leaks, some people will fill it with dry soil into the inlet pipe of the water pump and flush it with water to the bottom valve, which is not advisable. Because when dry soil is placed in the inlet pipe and the water pump starts working, it will enter the pump, causing damage to the pump impeller and bearings, which shortens the service life of the water pump. When the bottom valve leaks, it must be repaired. If it is severe, it needs to be replaced with a new one.

4. After using the water pump, it is necessary to pay attention to maintenance. For example, when the water pump is used up, the water in the pump should be drained clean, the water pipe should be removed, and then rinsed with clean water.

5. The adhesive tape on the water pump should also be removed, then rinsed with water and dried in a sunny area. Do not place the adhesive tape in a dark and damp place. The tape of the water pump must not be stained with oil, let alone apply some sticky substances on the tape. Carefully inspect the impeller for cracks and looseness when fixing it to the bearing. If there are cracks or looseness, repair them in a timely manner. If there is soil on the water pump impeller, clean it up. Unable to start, first check the power supply condition: whether the connector connection is secure; Check if the switch contacts are tight; Whether the fuse is blown; Is the three-phase power supply lacking equality. If there is an open circuit, poor contact, blown fuse, or missing phase, the cause should be identified and promptly repaired. Secondly, check if it is a mechanical fault of the water pump itself. Common reasons include: too tight packing or blockage between the impeller and the pump body caused by debris; Rust on the pump shaft, bearings, and leakage reducing ring; Severe bending of the pump shaft, etc. Elimination method: Loosen the filling material and dredge the drainage channel; Disassemble the pump body to remove debris and rust; Remove the pump shaft for calibration or replace it with a new one.