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Aerator: How are aerators applied in actual sewage treatment?
Release time:
2022-12-12 13:38
Due to the diverse composition of industrial wastewater, a treatment system consisting of multiple methods is usually required to meet the required emission standards. According to the methods and means used, wastewater treatment can be divided into physical methods, chemical methods, physicochemical methods, and biological methods. Biological methods utilize the metabolic decomposition of biodegradable organic matter in water by microorganisms in the wastewater. Due to its large treatment capacity, low investment, and economic reliability, it is a common water treatment method in the world today.
1. Aerator Application in wastewater treatment
According to the aerobic conditions of the participating microorganisms, biological treatment methods can be divided into aerobic methods and anaerobic methods.
Generally speaking, aerobic processes are more suitable for wastewater with lower concentrations, such as wastewater from ethylene plants. However, anaerobic methods are more suitable for treating high-concentration sludge and wastewater.
Aerobic biological treatment methods can be divided into activated sludge methods and biofilm methods. The activated sludge method is a method of artificially enhancing the self-purification capacity of water bodies, and is a method that relies on the activated sludge to remove organic matter from wastewater. The aerobic microorganisms present in the activated sludge can only function in the presence of oxygen. In the aeration tank of the wastewater treatment bio-chemical system, aeration efficiency is positively correlated with the growth of aerobic microorganisms. The supply of dissolved oxygen should be considered comprehensively based on the quantity, physiological characteristics, substrate characteristics, and concentration of aerobic microorganisms. In this way, the activated sludge can be in an excellent state for organic matter degradation.
According to tests, the dissolved oxygen in the aeration tank should be maintained 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 done through equipment such as air blowers.
2. Aeration principle
Aeration is a method of bringing air and water into close contact. Its purpose is to dissolve the oxygen in the air into the water, or to discharge unwanted gases and volatile substances in the water into the air. In other words, it is a means of promoting mass exchange between gas and liquid. It also has other important functions, such as mixing and stirring. Oxygen in the air is transferred to the water through aeration, and oxygen is transferred from gas to liquid.
According to the two-film theory, there are gas films and liquid films at the "air-water" interface, and the gas film and liquid film flow outside the air and liquid, which is a turbulent state. There is laminar flow between the gas film and the liquid film, and there is no convection. Under certain conditions, there will be a pressure gradient and a concentration gradient. 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 into the water body through the liquid film, so the liquid film and the gas film will become obstacles to the diffusion of oxygen in the water. This is the two-film theory.
Obviously, an effective way to overcome the liquid film barrier is to rapidly change the "gas-liquid" interface. This is the case with aeration and stirring. Specific methods include reducing the size of bubbles, increasing the number of bubbles, increasing the turbulence of the liquid, increasing the installation depth of the aerator, and prolonging the contact time between bubbles and liquid. Based on this practice, aeration equipment has been widely used in wastewater treatment.
Aerator, vortex aerator, microporous aerator
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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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