Blog
Blog
Industry News
Company News
Aerator: Application of aerator technology in wastewater treatment
Release time:
2022-12-12 13:38
1. Application of Aerators in Wastewater Treatment
Based on the aerobic conditions involved in microorganisms, biological treatment methods can be divided into two categories: aerobic and anaerobic.
Generally, aerobic methods are more suitable for low-concentration wastewater, such as ethylene plant wastewater. Anaerobic methods are more suitable for the treatment of sludge and high-concentration wastewater.
Aerobic biological treatment methods can be divided into two categories: activated sludge method and biofilm method. The activated sludge method is an artificially enhanced method for water self-purification, which is a method that relies on the sludge body to remove organic matter in wastewater. The aerobic microorganisms present in the sludge can only function in the presence of oxygen. In the aeration tank of the wastewater treatment bio-system, the oxidation efficiency is positively correlated with the growth of aerobic microorganisms. The supply of dissolved oxygen should be considered comprehensively according to the number, physiological characteristics, substrate characteristics and concentration of aerobic microorganisms. In this way, the sludge can be in a good state of degrading organic matter.
According to experiments, it is recommended to keep the dissolved oxygen in the aeration tank at 3-4 mg/L. If the oxygen supply is insufficient, the sludge performance will deteriorate, and the wastewater treatment effect will be reduced. In order to ensure sufficient oxygen supply, it relies on equipment such as aerators.
2. Aeration Principle
Aeration is a means of bringing air and water into close contact, with the aim of dissolving oxygen in the water or releasing unwanted gases and volatile substances from 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 the oxygen undergoes mass transfer from the gas phase to the liquid phase. The theory of this mass transfer and diffusion is currently widely used in the two-film theory proposed by Lewis and Whitman.
The two-film theory holds that there are air and liquid films at the "air-water" interface. Outside the air and liquid films, there is air and liquid flow, which are in a turbulent state. The air and liquid films are in a laminar state. Convection exists, and under certain conditions, pressure gradients and concentration gradients will exist. 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 into the water body, so the liquid film and gas film will become barriers to water vapor. Oxygen permeation. This is the two-film theory.
Obviously, a useful way to overcome the liquid film barrier is to rapidly change the "gas-liquid" interface. Aeration and stirring are such cases. Specific methods include: reducing the size of bubbles, increasing the number of bubbles, increasing the turbulence of the liquid, increasing the installation thickness of the aerator, and prolonging the contact time between the bubbles and the liquid. Based on this method, aeration equipment is widely used in wastewater treatment.
Scraper, cyclone aerator, microporous 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
Contact Information
Address: No. 104, Unit 1, Building 2, Far East Ocean Tide Xuan Center, Tangye Street, Licheng District, Jinan City, Shandong Province
Mobile Website
WeChat Customer Service
Shandong Zhiyuan Environmental Engineering Co., Ltd. Copyright reserved This website supports IPV4&IPV6 dual-way access