Technical Agreement for Submersible Centrifugal Aeration Machine in Activated Sludge Tank

Technical Agreement for Submersible Centrifugal Aeration Machine in Activated Sludge TankMain scope of application:

1. Deep water aeration;

2. SBR biochemical tank aeration and agitation;

3. Nitrification or denitrification biochemical aeration and mixing;

4. Sludge aeration and mixing;

5. High organic wastewater treatment process.

Characteristics of QXB centrifugal aerator:

1. Compact structure and small area;

2. Open structure, unobstructed;

3. High transmission efficiency, mixed soft uniform;

4. Small gas pressure loss and low energy consumption;

5. Adjust the intake volume according to the process requirements;

6. The motor protection function is complete, the sealing is reliable, and it is easy to achieve automatic control;

7. Installation, maintenance, and upkeep are simple and convenient.

Product Structure:

Jiangsu Du'an Environmental Protection QXB Centrifugal Submersible Aeration Machine is one of the environmental protection equipment, widely used in many occasions, especially in sewage treatment plants and some slaughter wastewater treatment plants.

The structural composition of a submersible aerator:

1. Main reduction mechanism: composed of a main variable frequency speed regulating motor, an incremental encoder, and a main reducer. The motor starts and is reduced by the main reducer, increasing the torque. By adjusting the speed of the variable frequency speed control motor with an incremental encoder, various accurate speed outputs can be achieved to meet the process requirements of the aerator. The reducer gears are made of low-carbon high-strength alloy materials and processed through processes such as carburizing, quenching, and grinding. Significantly improve the load-bearing capacity of the gearbox.
2. Lifting mechanism: composed of lifting reducer, value encoder, trapezoidal screw, KK alloy nut, bearing seat, bearing sleeve, connection method, and several bearings. By using a value encoder lifting mechanism, more accurate lifting stroke and speed can be achieved.
3. Output mechanism: The output mechanism consists of an internal spline shaft (fixedly connected to the output gear of the main reducer), an external spline shaft (fixedly connected to the output gear of the main reducer), an external spline shaft, a coupling, a transmission shaft, etc. The internal and external spline shafts are treated with high-strength medium carbon alloy quenching and tempering. The axial direction between the internal and external spline shafts is a sliding connection, and the external spline shaft can achieve up and down lifting while transmitting torque.

After assembly, each submersible centrifugal aerator undergoes performance testing to ensure that the overall performance of the unit meets relevant standards, with an operating time of not less than 8000 hours and a design service life of not less than 15 years.

Necessary preparations before use:

(1) It is necessary to carefully read the instruction manual to avoid damaging the machine due to improper use. Carefully check whether the selection of the submersible aerator is correct and whether the actual usage conditions are consistent with the specified usage conditions.

(2) Clean the water tank or waterway to prevent debris from entering the aeration port.

(3) An electrician should use a 0-500V megohmmeter to check that the insulation resistance of the three core wire of the motor main cable to ground is not less than 5 megohms. It is strictly prohibited to use a megohmmeter to check the control cable to avoid damaging the electrical components inside the aerator. Instead, a multimeter should be used to check the control cable.

(4) The voltage must be checked within the range of ± 5% of the rated voltage indicated on the nameplate. If the power supply is far away from the use of the submersible aerator, considering line loss, the cross-sectional area of the cable should be increased, the number of joints should be minimized, and the joints should be sealed to prevent water leakage; In addition, considering the convenience of maintenance and repair, it is recommended to set up a terminal box next to the machine.

(5) The power cables, grounding wires, and control cables on the submersible aerator should be connected to the wiring heads of the control cabinet (box) one by one.

(6) The submersible aerator is equipped with a dedicated control cabinet. Before use, carefully read its instructions and check whether the equipment wiring is correct, whether the starting device is flexible, whether the contact is good, whether the metal shell of the starting equipment is reliably grounded, check whether all wiring is loose, and tighten it again.

(7) The grounding wire of the submersible aerator is a two-color wire (yellow/green). To ensure safety, it must be securely connected and 50mm longer than other wires.

Precautions for the operation of submersible aerators:

The submersible centrifugal aerator is equivalent to the heart of the sewage treatment system, and its normal operation directly affects the stability of the sewage treatment system. To ensure the normal operation of the submersible centrifugal aerator, the following four aspects should be emphasized:

1. Ensure good ventilation in the machine room of the submersible centrifugal aerator. Submersible centrifugal aerator is a major energy consumer in sewage treatment systems, and it generates heat during operation. If its temperature cannot be diffused in a timely manner, especially in summer, it can cause the temperature of the submersible centrifugal aerator to rise too high. This not only affects the lifespan of the electric motor, but in severe cases, it can also cause the submersible centrifugal aerator to shut down due to insufficient power. If necessary, air conditioning can be used to cool down and solve the problem of temperature rise in the submersible aerator fan.

2. During daily management, it is necessary to regularly check the inlet and outlet air pressure of the blower. If the inlet air pressure is too low, the inlet filter should be cleaned or replaced in a timely manner. If the outlet air pressure is too high, the outlet pipeline should be checked. The cause may be blockage of the aerator microporous membrane or water accumulation in the air pipeline. Cleaning the microporous membrane or draining the water in a timely manner can solve the problem.

3. The exhaust temperature of the blower should be controlled, especially in summer. Excessive exhaust temperature can not only cause an increase in fan temperature, but also affect oxygen filling. It can generally be prevented by exposing and preventing direct sunlight.

4. Pay attention to lubrication and maintenance, strictly follow the operating and maintenance procedures required by the submersible centrifugal aerator manufacturer, regularly inspect and replace lubricating oil in a timely manner.

Technical Agreement for Submersible Centrifugal Aeration Machine in Activated Sludge TankSelection method:

1. Flow rate is one of the important performance data for selecting a centrifugal aerator, which directly affects the production and transportation capacity of the entire device. If the design process can calculate the normal, small, and three flow rates of the centrifugal aerator. When choosing a centrifugal aerator, the flow rate should be taken as the basis, while considering the normal flow rate. When there is no flow rate, it is usually 1.1 times the normal flow rate can be taken as the flow rate.

2. Head is another important performance data for selecting a centrifugal aerator, and generally needs to be selected by enlarging the margin by 5% to 10% before selecting the head.

3. The properties of liquids include the name of the liquid medium, physical properties, chemical properties, and other properties. Physical properties include temperature c, density d, viscosity u, diameter of solid particles in the medium, and gas content. This involves the head of the system, calculation of effective cavitation allowance, and appropriate pump type. Chemical properties mainly refer to the chemical corrosiveness and toxicity of the liquid medium, which are important criteria for selecting pump materials and choosing the type of shaft seal.

4. The pipeline layout conditions refer to the liquid delivery height, distance, direction, suction side liquid level, discharge side liquid level, and other data, as well as pipeline specifications and their lengths, materials, pipe fittings specifications, quantities, etc., in order to calculate the comb head and verify the cavitation allowance.

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

Installation method:

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

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

3. The base of the machine and pump should be level, and the connection with the foundation should be firm. When the machine and pump are driven by belts, the tight edge of the belt should be at the bottom, which increases the transmission efficiency. The direction of 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 coaxial.

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

If there are multiple units in the same computer room, there should be a distance of at least 800mm between each unit and between each unit and the wall.

6. The suction pipe of the water pump must be well sealed, and bends and gate valves should be minimized as much as possible. When filling and diverting water, the air should be completely discharged. During operation, there should be no accumulation of air in the pipe. The suction pipe should be slightly inclined upwards and connected to the inlet of the water pump, and the inlet should have a certain submergence depth.

Reasons for the decrease in efficiency of centrifugal aerators:

1. Due to the erosion of water flow, the inner wall of the pump channel and the water surface of the impeller become rough and uneven, and the friction coefficient of the flow channel inside the pump increases. In addition, the flow velocity of water inside the pump is very high, resulting in an increase in head loss. Hydraulic efficiency decreases.

2. Due to the addition of medication or water quality before the pump, severe scaling or corrosion may occur inside the pump casing. Severe accumulation of scale inside the pump casing can increase the wall thickness by about 2ram, and the formation of scale nodules on the inner wall of the water pump can reduce the volume of the pump body, decrease the pumping volume, and make the flow channel rough, resulting in increased head loss. Both passenger flow efficiency and hydraulic efficiency have decreased.

3. Due to casting defects, cavitation, abrasion, corrosion, and chemical erosion caused by the water pump processing technology, voids or cracks are formed in the pump flow channel, and energy loss is caused by vortices generated during water flow. Hydraulic efficiency decreases.

4. Cavitation on on the surface of the impeller. Due to the negative pressure generated during the operation of the blade's water surface, when the pressure Pk is reached, air pockets and honeycomb surfaces are formed, which cause cavitation of the pump blades under the action of electrochemical corrosion.

5. Volume loss and mechanical loss. Due to the prolonged use of the pump, mechanical wear leads to leakage and increased resistance, resulting in a decrease in volumetric efficiency and mechanical efficiency.

After sales instructions of Du'an Environmental Protection Equipment (Jiangsu) Co., Ltd.:

1. Logistics and Freight Description

Submersible sewage pumps, submersible mixers, and other heavy goods can be shipped by express delivery from Jiangsu, Zhejiang, and Shanghai for products weighing less than 50KG. For products weighing more than 50KG, logistics is required. Comprehensive protectors, water leakage protectors, and thermal protectors will be delivered to your doorstep by express delivery. We have dozens of reputable logistics companies that we cooperate with, and we will select the fastest logistics for you. We can prepay or collect the shipping fee, and we will explain it before quoting.

2. Online ordering

Our company is vigorously developing online business and welcomes you to place orders online. We provide double protection for you, including contractual constraints and confirmation of payment.

3. Maintenance and upkeep.

All products of our company come with a one-year warranty; If there is a quality problem within 3 months, the seller shall bear the round-trip repair shipping cost; If there are quality problems within one year, both parties shall bear half of the shipping cost. Please be informed. If it is not a quality issue after inspection, the buyer needs to pay for the repair cost and round-trip shipping. We promise to only charge a cost fee for the replaced parts. We implement lifelong maintenance.