Blog
Blog
Industry News
Company News
Explain the cause of the corrosion and collapse of the top of the anaerobic tower shortly after operation.
Release time:
2022-12-12 13:38
Anaerobic tower It has a biocarrier zone and is a type of anaerobic digestion method with both suspended growth and attached growth. Compared with anaerobic biofilters, UBF reduces the height of the packing layer, thus reducing the possibility of filter clogging. Compared with the UASB method, the packing layer is not only a carrier for anaerobic microorganisms, but also intercepts suspended anaerobic activated sludge fragments in the water flow, maintaining a high microbial biomass in the anaerobic tower and ensuring the quality of the effluent.
Generally, anaerobic towers can remove more than 70-90% of the COD load in the entire system, and their importance is widely accepted. At the same time, the reliability of anaerobic towers is receiving increasing attention. Recently, we received a customer inquiry saying, "The top of our anaerobic tower collapsed. Will this affect the treatment effect? If it affects production, exceeding the effluent standards will be troublesome! This equipment has only been used for 3 years, and it has become a dangerous equipment. How could this happen! "
What is the reason for this? Anaerobic tower Let's take this as an example to talk about the top structure of the anaerobic tower.
I. Current Situation
This is an anaerobic reactor with a collapsed top, which has only been used for 3 years. After lowering the liquid level, we can find that the steel pipes used to support the top passage have now corroded and broken. The hangers of the effluent channel will break. The walkway support beams (I-beams) have been corroded to the point of being as thin as paper.
II. Cause Analysis
There are three main reasons for this result:
1. Electrochemical corrosion occurs in the direction of the gas-water interface, so the corrosion is severe;
2. The H2S produced by anaerobic conditions dissolves in the condensed water on the surface of the support beam, which can soak the outer anticorrosion layer and directly corrode the metal profile.
3. During the project construction, the equipment anticorrosion quality was poor.
III. Improvement Methods
Now that we know the cause of the problem, let's take corresponding measures for these situations.
1. It is recommended to refer to the top structure design of foreign manufacturers, using non-metallic raw materials as the support beams for the top passage, which can prevent corrosion; generally, only inspection is required, and no production line inspection is required.
2. If metal profiles are still used, corrosion-resistant raw materials should be selected as much as possible. During the anticorrosion operation, the construction operation should be carried out strictly in accordance with the standard operating procedures: sandblasting should be used for rust removal, and manual mechanical polishing should not be used to ensure the roughness of the data appearance; products such as polyamide epoxy primer and tar epoxy topcoat should be used. And try to choose coatings suitable for the outer shell and ballast tank anticorrosion of ocean-going vessels.
The quality of the duty paint cannot be checked by simply brushing several coats, but should be checked according to the film thickness, which can be measured with a film thickness gauge. During the specific construction, it is also necessary to pay attention to whether the temperature, humidity, and cleanliness of the material surface meet the construction requirements.
Anaerobic tower
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