The Roots blower for aeration is a key equipment in the sewage treatment process. The following is a detailed introduction to it:
1、 Working principle
Roots blowers are mostly three bladed, which compress and transport gas through two sets of three bladed impellers moving relative to each other in the cylinder, completing the suction and exhaust processes. Its structure is simple, easy to manufacture, and due to the use of a three blade rotor structure and a reasonable structure at the inlet and outlet of the housing, the fan has low vibration and noise, and can operate continuously for a long time.
2、 Main features
1. Stable flow: Roots blower is a positive displacement fan, and its air volume is less affected by pressure changes, providing stable airflow.
2. Wide pressure range: Roots blowers can adapt to different pressure requirements and are suitable for various scenarios.
3. Simple and compact structure: Roots blower has a relatively simple structure, which is easy to maintain and repair.
4. Smooth operation: Roots blower has low vibration and noise, and can operate continuously for a long time.
3、 Application scenarios
1. Wastewater treatment: In activated sludge and other wastewater treatment processes, Roots blowers blow air into the aeration tank to provide sufficient oxygen for microorganisms to decompose organic matter in the wastewater, achieving the goal of purifying water quality. At the same time, the generated airflow can be used to stir the sewage, allowing the pollutants in the sewage to be fully mixed with the treatment agents, thereby improving the treatment efficiency.
2. Aquaculture: Roots blowers can be used for oxygenation in aquaculture ponds, by injecting air into the water through an aeration system to increase the dissolved oxygen content in the water, providing a good living environment for aquatic organisms such as fish and shrimp, and improving aquaculture density and yield.
3. Pneumatic conveying: In industries such as chemical, building materials, and grain, Roots blowers can be used to transport powdered materials such as cement, flour, coal powder, as well as granular materials such as plastic particles and grains.
4、 Selection precautions
1. Actual usage status: Due to the fact that the fan may be in non-standard conditions (such as temperature, atmospheric pressure, altitude, etc.) during actual use, the performance requirements of the fan need to be converted into fan parameters under standard intake conditions when designing and selecting.
2. Export pressure: The exhaust pressure of a positive displacement blower does not depend on the fan itself, but on the condition of the device after the gas is discharged (i.e. back pressure). When selecting, the pressure generated by the exhaust system should be considered.
3. Air flow rate: When calculating the oxygen demand for sewage treatment, it is necessary to convert it into the volumetric flow rate of air required under standard conditions. At the same time, it is necessary to consider the impact of various factors when the usage conditions change (such as in high-altitude areas) to ensure that the actual air flow supplied by the fan can meet the usage requirements.
4. Seasonal variation: For the same blower, its volumetric flow rate remains unchanged in winter and summer, but the mass flow rate may vary due to different air densities. When selecting, it is necessary to consider the impact of seasonal changes on oxygen supply.
5、 Usage and maintenance
1. Pre ventilation testing: During the testing operation before ventilation, the fan should be started first and 50% of the air should be sent to the aeration pipeline of the biochemical tank for testing to ensure that there is no air leakage in the pipeline.
2. Lubrication condition: During leak testing, an appropriate amount of lubricating oil should be continuously added to the air outlet to ensure the normal operation of the equipment and avoid no-load operation. It is particularly important to note that lubricating oil cannot be automatically circulated under no pressure, so close attention should be paid to whether the equipment is running out of oil.
3. Maintenance cost: Roots blower has a simple structure and is easy to maintain. However, it should be noted that different types of Roots blowers may have different maintenance costs, and when selecting, factors such as equipment procurement costs and operation and maintenance expenses need to be comprehensively considered.
In summary, Roots blowers for aeration play an important role in fields such as sewage treatment. When selecting, attention should be paid to factors such as actual usage status, outlet pressure, air flow rate, seasonal changes, etc., to ensure that the fan can meet the usage requirements. At the same time, attention should also be paid to the lubrication and maintenance costs of the equipment during use.
