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Anaerobic tower: What to do after the top of the anaerobic tower is corroded?
Release time:
2022-12-12 13:38
Anaerobic tower Areas prone to corrosion are the gas-liquid interfaces, due to electrochemical corrosion. Prolonged corrosion will thin the steel of the anaerobic tower, and external forces could lead to collapse or leakage.
The reliability and safety of anaerobic towers are increasingly being emphasized. Today, we will analyze a case of an anaerobic tower top collapse.
1. Current Situation
This is an anaerobic tower with a collapsed top, only 3 years old. After lowering the liquid level, we found that the steel pipes supporting the top platform had corroded and fractured. The effluent channel hanger is about to break, and the walkway support beams (I-beams) are as thin as paper from corrosion.
2. Cause Analysis
This result is mainly due to the following three reasons:
1) Electrochemical corrosion occurs at the gas-water interface, resulting in more severe corrosion;
2) Anaerobically produced H2S dissolves in the condensate on the surface of the support beams. Over time, it can penetrate the surface anti-corrosion layer and directly corrode the metal profiles;
3) Poor quality of equipment anti-corrosion during project construction.
3. Solutions
Now that we know the root cause of the problem, we will take corresponding measures.
1) It is recommended to refer to the top structure design of foreign manufacturers and use non-metallic materials as the support beams for the top platform to completely avoid corrosion; generally, only inspection is needed, and major repairs that shut down the production line are unnecessary.
2) If metal profiles are still used, materials with good corrosion resistance should be selected. During anti-corrosion work, the standard operating procedures should be strictly followed:
Sandblasting should be used for rust removal; manual mechanical polishing should not be used to ensure the surface roughness of the material;
High-quality anti-corrosion paints should be used, such as polyamide epoxy primer and tar epoxy topcoat, or coatings suitable for the hulls and ballast tanks of ocean-going vessels.
The quality of anti-corrosion paint cannot be assessed by the number of coats applied; it should be assessed according to the film thickness, which can be measured using a film thickness gauge.
During the specific construction, attention should also be paid to whether the temperature, humidity, and cleanliness of the material surface meet the construction requirements.
Anaerobic reactor, anaerobic tower, 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
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