Product Description:
Spiral aerator is a new type of aeration device developed and improved on the basis of commonly used spiral aerators, diffuser aerators, and Jinshan type aerators. This product has the characteristics of simple structure, light weight, high oxygen utilization rate, low clogging, and easy installation.
The HNBQ-300, 315, and 420 series fixed spiral aerators are made of PP or fiberglass material by the Second Research and Design Institute of the Ministry of Nuclear Industry, based on the design of similar aerators abroad and the actual situation in China.
The fixed double spiral aerator has been tested for clean water oxygenation by Beijing Institute of Architecture and Technology, and its main technical performance has been proven to meet or approach the indicators of similar foreign products.
In June 1982, the Science and Technology Nuclear Power Bureau of the Ministry of Nuclear Industry held an appraisal meeting in Beijing. Through the new product technology appraisal, it was unanimously agreed that the fixed spiral aerator process has low operating resistance, uniform gas distribution, high oxygen transfer efficiency and power efficiency, saves electricity, and has the advantages of simple structure, easy installation and use, not easy to block, and corrosion resistance. It is a relatively advanced aeration and oxygenation device at home and abroad.
Fixed spiral aerators have been put into production and operation in Tianjin Fifth Wood Factory, Beijing Coking Plant, Beijing Guanghua Dyeing and Weaving Plant (introducing Japanese Dongli company's spiral aerator), Shanghai East District Sewage Treatment Plant, Heilongjiang Shangzhi Weihe Artificial Fiber Board Plant, Shenzhen Gaoshangbu Sewage Treatment Plant and other units, and have achieved good results. When the water depth is 3.0 meters, compared with perforated pipes, the treatment effect can be improved by 15-20% or energy-saving by about 20%; When the water depth is 5.0 meters, both achieve the same treatment effect, and the fixed spiral aerator saves 30-40% electricity compared to perforated pipes. At the same time, the aeration device has been produced and operated domestically for six years without any blockage, and the operating effect is good.
In view of the above situation, this device has been widely used in the treatment of industrial wastewater and urban sewage in textile, printing and dyeing, synthetic fiber, coking, wood, food, light industry, petrochemical, pesticide and other industries both domestically and internationally.

2、 Working principle
Aeration equipment, also known as high-efficiency stirring aerator or or oxygenation stirring device, has been widely used in the field of wastewater treatment. Due to its main function being focused on aeration, the fixed spiral aerator is generally composed of two sections.
Equipment features:
1. Due to the spiral upward movement of compressed air in the aeration tube, the interface contact time is greatly prolonged, resulting in high efficiency of air-water mixing.
2. The spiral rising compressed air continuously collides with the wall of the aeration tube, forming countless microbubbles and increasing the area of the gas liquid contact interface.
3. Bubbles rotate at a high speed of about 1.2 meters per second, forming turbulent flow, especially in wastewater treatment systems, which allows the water at the bottom of the pool to mix thoroughly with the water on the surface of the pool.
4. The entire device is composed of fixed components without any rotating machinery. In addition, the gas has a fast rotation speed and low frictional resistance, so there is no maintenance workload after it is put into operation.
5. Compressed air is sent to the bottom of the aeration cylinder through the gas pipeline and sprayed out from the air distribution pipe, forming bubbles. In the upright aeration cylinder, the bubbles rise, causing water to flow. The water and gas mix under the guidance of the spiral plate, presenting a spiral spiral upward movement, gas-liquid mixing, and severe disturbance. Due to the continuous injection of compressed air, on the one hand, it produces a jetting effect; On the other hand, as the bubbles rise and collide, the liquid boils around, achieving a stirring effect.

3、 Main design points:
(1) Fixed spiral aerators are commonly used in activated sludge processes in China, and are suitable for push flow and fully mixed aeration tanks. Generally, push flow operates better. It can also be used to regulate the pre aeration of the tank and prevent the deposition of large sediment particles.
(2) To improve the oxygenation efficiency of the aerator, the actual water depth of the aeration tank is above 4.0 meters. At the same time, in order to save land and reduce power costs, a guide tube can be added at the bottom of the aerator to enhance the sludge reflux lifting effect. The height of the guide tube can be 0.5-1.0 meters, and if there is actual test data, the guide tube can also be considered for extension. The distance between the suction port of the guide tube and the pool should be minimized as much as possible, generally ranging from 250 to 300 millimeters. When the water depth of the regulating tank and aeration tank is shallow (2.5-3.0 meters), the ф 315 or ф 420 two-stage double helix aerator can be used.
(3) Each aerator has a service area of 3-5 meters for single helix, 3-6 meters for ф 315 double helix, and 4-8 meters for ф 420 double helix and triple helix (usually 6-8 meters for urban sewage and 4-6 meters for industrial wastewater). 1-1.5 meters away from the edge of the pool.
The number of aerators set is mainly determined based on factors such as water depth, effective volume, and air volume of the aeration tank.
(4) Each aeration requires a gas volume of 0.5-1.3 cubic meters per minute, which should be calculated based on the BOD5 content in the raw water. Generally, urban sewage requires 0.5-1.0 cubic meters per minute, while industrial wastewater requires 0.7-1.3 cubic meters per minute. The resistance of the aerator varies with the air volume, not exceeding 250 millimeters of water column, so the air pressure of the blower can be selected according to the table.
(5) The design of air pipes should consider forming a ring network, with two pipes per branch and valves installed to facilitate the adjustment of air volume. The design flow rate of the air pipe is 10-15 meters per second for the main pipe and 5 meters per second for the branch pipe.
(6) To prevent activated sludge from depositing in the air pipeline and causing pipeline blockage, a 90 ℃ elbow can be added at the end of the distribution pipe, and a small hole with a diameter of ф 10 mm can be opened at the top of the pipe towards the bottom of the pool to facilitate the discharge of sediment. Double helix and triple helix aerators generally consist of three sections per unit. If the water depth is shallow (2.5-3.0 meters), a two section single helix aerator can also be used. Each unit consists of five sections, forming a cylindrical channel (also known as a single channel). Double helix aerators have two cylindrical channels per section (also known as two channels), while triple helix aerators have three cylindrical channels (also known as three channels). There are fixed spiral blades twisted 180 ° in each channel, and the rotation direction of the blades is the same in the same section of the spiral, while the rotation direction of the spiral blades in adjacent sections is opposite. The cylindrical channels between the aerator sections are staggered by 90 ° or 60 °, and both the double helix and triple helix have elliptical transition chambers for collecting, mixing, and distributing fluids. Each aerator is supported by a pair of diagonal steel frames.
The aerator is installed in water without rotating parts. Air enters from the bottom of the aerator, and the bubbles are cut multiple times through rotation, radial mixing, and reverse rotation. The bubbles continue to shrink, gas-liquid continuously infiltrates and mixes, and the contact area increases, which is very conducive to oxygen transfer. At the same time, as the density of the gas water mixture decreases, a larger upward flow velocity and lifting effect can be formed. Make the water around the aerator flow towards the bottom of the pool, causing a large circulation of water flow.

4、 Working principle
Aeration equipment, also known as high-efficiency stirring aerator or or oxygenation stirring device, has been widely used in the field of wastewater treatment. Due to its main function being focused on aeration, the fixed spiral aerator is generally composed of two sections.
Equipment features:
1. Due to the spiral upward movement of compressed air in the aeration tube, the interface contact time is greatly prolonged, resulting in high efficiency of air-water mixing.
2. The spiral rising compressed air continuously collides with the wall of the aeration tube, forming countless microbubbles and increasing the area of the gas liquid contact interface.
3. Bubbles rotate at a high speed of about 1.2 meters per second, forming turbulent flow, especially in wastewater treatment systems, which allows the water at the bottom of the pool to mix thoroughly with the water on the surface of the pool.
4. The entire device is composed of fixed components without any rotating machinery. In addition, the gas has a fast rotation speed and low frictional resistance, so there is no maintenance workload after it is put into operation.
5. Compressed air is sent to the bottom of the aeration cylinder through the gas pipeline and sprayed out from the air distribution pipe, forming bubbles. In the upright aeration cylinder, the bubbles rise, causing water to flow. The water and gas mix under the guidance of the spiral plate, presenting a spiral spiral upward movement, gas-liquid mixing, and severe disturbance. Due to the continuous injection of compressed air, on the one hand, it produces a jetting effect; On the other hand, as the bubbles rise and collide, the liquid boils around, achieving a stirring effect.

5、 Technical parameters
1. Wind pressure: When the depth of the wastewater tank is ≤ 4m, the wind pressure used shall not be less than 50KPa; When the depth of the wastewater tank is between 4 and 6 meters, the wind pressure used shall not be less than 70 KPa.
2. Gas consumption: Each φ 310 device consumes approximately 30Nm3/h.
3. Selection of air pipes: The selection of air pipes is calculated based on an air flow velocity of 5m/s.
4. Service area: Each φ 310 device has a service area of 7-9m2.
5. Equipment installation: The distance between the bottom of the device and the bottom of the pool is about 150-300mm. There are two installation methods: one is to embed foot bolts at the bottom of the pool, and the other is to install the device on a concrete block and adjust it together with the concrete block.
6、 Scope of application
1. Scope of application:
(1) Activated sludge treatment of urban sewage and various industrial wastewater.
(2) When the efficiency of the already running aeration tank is not high, an aerator can be used to improve the treatment capacity and effectiveness.
(3) Can be used as a pre aerator for sewage regulation tanks to prevent sedimentation of large sediment particles and remove some organic matter.
(4) It can be used for aeration in natural ponds and rivers with severe pollution for water purification treatment.