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Many types of industrial wastewater can be treated using a vortex aerator
Release time:
2022-12-12 13:39
Many factories are built in the suburbs, and many are built directly by the river, discharging wastewater directly into the river. The government forcibly shut down these factories! The types of factories are increasing, and the composition of their industrial wastewater is also increasing. Usually, we need a treatment system composed of several methods to achieve the required emission standards. One of the most common methods for treating industrial wastewater is a swirling aerator 。
Among them, the biological method is a method that uses the metabolism of microorganisms in wastewater to decompose degradable organic matter in water. Due to its large processing capacity, low investment, and economic reliability, it is the most common water treatment method in the world today. In the aeration tank of the sewage bio-treatment system, the oxidation efficiency and wastewater treatment effect are positively correlated within a certain range. Experiments show that it is recommended to keep the dissolved oxygen in the aeration tank at 3-4 mg/L. If the oxygen supply is insufficient, the performance of the activated sludge will deteriorate, resulting in a decrease in wastewater treatment efficiency. To ensure sufficient oxygen supply, it must be accomplished through equipment such as a cyclone aerator.
Aeration is a means of bringing air and water into close contact, with the purpose of dissolving the oxygen in the air in the water, or discharging unwanted gases and volatile substances in the water into the air. In other words, it is a means of promoting material exchange between gas and liquid. It also has other important functions, such as mixing and stirring.
The two-film theory holds that there are air and liquid films at the "air-water" interface. Air and liquid flow to the outside of the air and liquid films, which is a turbulent state; the air and liquid films are in a laminar flow state, there is no convection, and a pressure gradient and concentration gradient may appear under certain conditions. If the oxygen concentration in the liquid film is lower than the saturated concentration of oxygen in the water, the oxygen in the air will continue to diffuse inward through the liquid film and into the water body, so the liquid film and gas film will become barriers to oxygen transfer. Obviously, the most effective way to overcome the liquid film barrier is to rapidly change the "gas-liquid" interface. Aeration and stirring are the case. The specific methods are to reduce the size of the bubbles, increase the number of bubbles, increase the turbulence of the liquid, increase the installation depth of the cyclone aerator, and extend the contact time between the bubbles and the liquid. Based on this method, cyclone aerators are widely used in wastewater treatment.
a swirling aerator types and functions of aeration
Aeration types are roughly divided into two categories: one is blowing aeration, and the other is mechanical aeration. Blowing aeration is an aeration method that uses aerators/diffusers or diffusers to introduce bubbles into the water. Mechanical aeration refers to an aeration method that uses impellers and other instruments to introduce bubbles.
All aeration equipment should meet the following 3 functions:
① When biological oxidation continues to consume oxygen, produce and maintain effective gas-water contact, and maintain a certain dissolved oxygen concentration in the water;
② Sufficient stirring and water circulation in the aeration zone;
③ Maintain sufficient liquid velocity to keep the biological solids suspended in the water.
Swirling aerator
Practical application of IC tower in food processing wastewater treatment
Wastewater from the food processing industry contains a large amount of organic matter, suspended solids, and oils. Traditional treatment methods often face problems such as high energy consumption and long processing cycles. The IC tower (internal circulation anaerobic reactor), with its unique internal circulation structure and three-phase separation system, demonstrates technical adaptability in treating high-concentration organic wastewater. The core advantage of the IC tower lies in its internal circulation mechanism. Through the fluid movement of the internal rising and falling pipes, it achieves thorough mixing of sludge and wastewater, improving biodegradation efficiency. In food wastewater treatment, the IC tower can adapt to influent conditions with a wide range of COD concentrations, especially suitable for the dairy, meat processing, and brewing industries. Practice has shown that when treating oily wastewater, the IC tower can stably achieve a COD removal rate that meets emission standards by reasonably controlling the hydraulic retention time and organic load. In an actual engineering case, a large seasoning production enterprise used the IC tower as a pretreatment unit. The influent COD concentration ranged from 8000-12000mg/L, and after treatment by the IC tower, it was reduced to below 1500mg/L, significantly reducing the burden on the subsequent aerobic treatment unit. The operating data shows that the biogas yield of the IC tower is stable and can be used for energy recovery, further reducing treatment costs.
The effectiveness of IC tower in treating high-concentration organic wastewater
The IC tower (internal circulation anaerobic reactor) is an important piece of equipment in modern wastewater treatment, demonstrating significant technical characteristics in treating high-concentration organic wastewater. Its unique internal circulation system enhances the contact efficiency between sludge and wastewater, making the organic matter degradation process more thorough and showing clear adaptability in treating industrial wastewater with a COD concentration exceeding 3000 mg/L. The treatment effect of this technology is mainly reflected in two dimensions: organic matter removal rate and biogas production. Actual operating data shows that in wastewater treatment for industries such as brewing and food processing, the IC tower usually maintains a high COD removal rate. The granular sludge formed inside the reactor has good settling performance, ensuring the stability of system operation. When the temperature is controlled around 35℃, the microbial activity reaches an optimal state, and the treatment effect is relatively ideal. In the process of treating high-concentration organic wastewater, the volumetric loading capacity of the IC tower is a key indicator that distinguishes it from traditional anaerobic processes. Due to its multi-stage reaction zone design and internal circulation flow pattern, the equipment can withstand high organic load shocks. Pharmaceutical wastewater treatment cases show that the system can still maintain stable operation when the influent COD fluctuates between 5000-8000 mg/L.
In the back-end process of semiconductor manufacturing, the IC handler (integrated circuit testing and sorting equipment) plays a core role in verifying chip functions and screening for quality. Its working principle is to use a precision robotic arm to send wafers or packaged chips to the testing station, and use the probe card and tester to complete the electrical parameter measurement. Then, according to the test results, it automatically sorts out qualified products and defective products. This integrated "test-judgment-sorting" process makes it a decisive link in the quality control before the chip leaves the factory. From a technical perspective, the gatekeeping role of the IC handler is reflected in three dimensions: First, the contact testing scheme can simulate the actual working state of the chip and detect physical defects such as open circuits, short circuits, and leakage; second, the multi-station parallel testing architecture achieves the screening capacity of thousands of chips per unit time, matching the production capacity needs of the packaging and testing factory; more importantly, its test data is directly related to the yield statistics of the chip, providing key evidence for process improvement. Current mainstream equipment supports environmental temperature testing from -40℃ to 150℃, covering the reliability verification needs of different application scenarios such as consumer electronics and automotive electronics. In industrial practice, the testing standards of IC handlers are often more stringent than the terminal application conditions. Taking the case of a major packaging and testing factory as an example
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