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Common Anomalies and Solutions in Anaerobic Towers (Part 1)
Release time:
2022-12-12 13:38
Anaerobic tower Because of its strong processing capacity, it is often used to treat high-concentration organic wastewater and plays an important role in the daily operation of wastewater treatment systems. During the operation of the anaerobic tower, phenomena such as slow growth of granular sludge, insufficient gas production, and sludge loss often occur. Today, let's talk about the causes and solutions of these abnormal phenomena.
The granular sludge in the anaerobic tower grows too slowly. Reasons: insufficient nutrients and trace elements; excessive pretreatment acidification; too low sludge load; granular sludge being washed away;
Solutions: Increase the concentration of nutrients and trace elements in the liquid; reduce the degree of pretreatment acidification; increase the reactor load.
Reactor overload reasons: insufficient reactor sludge or insufficient methane-producing activity of sludge. Solutions: Improve sludge activity; increase sludge volume; increase seed sludge volume or promote sludge growth; reduce sludge scouring.
Reasons for insufficient methane-producing activity of sludge: insufficient nutrients and trace elements; vigorous growth of acid-producing bacteria; accumulation of organic suspended solids in the reactor; decrease in reactor temperature; toxic substances in wastewater or environmental conditions inhibiting activity, and precipitation caused by inorganic substances such as calcium ions.
Solutions: Add nutrients and trace elements; increase the degree of wastewater pretreatment acidification; reduce the reactor load; increase the temperature; reduce the suspended solids concentration; reduce the calcium ion concentration in the influent; install a sedimentation tank before the anaerobic reactor.
Reasons for granular sludge scouring: Gas accumulates in empty granular materials, easily forming large and empty granular sludge under low temperature, low load, and low influent concentration; granular sludge forms a layered structure, and a large number of acid-producing bacteria covering the outside of the granular sludge cause gas-producing bacteria to gather in the granular sludge; due to the large amount of protein and fat in the wastewater, the granular sludge tends to float.
Solutions: Increase the sludge load; adopt more stable process conditions, increase the degree of wastewater pretreatment acidification; adopt pretreatment (sedimentation or chemical flocculation) to remove protein and fat.
Anaerobic tower
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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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