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Why is there severe sludge carryover in the anaerobic tower as soon as it starts up?
Release time:
2022-12-12 13:39
As we all know, high-efficiency anaerobic reactors are the core of wastewater treatment systems. In actual operation, some abnormal situations often occur, such as the loss of anaerobic granular sludge. Continuing to operate the sludge inevitably leads to a reduction in the amount of sludge in the anaerobic reactor. So why is there serious sludge loss in the anaerobic tower when it is just started?
Reasons for Sludge Loss
When the anaerobic tower is operating normally, a small amount of anaerobic sludge will be discarded with the water. If the discarded amount is significantly greater than the sludge produced, it is usually called "sludge running". Pay special attention to it.
There are many reasons for sludge loss. Common factors include: hollow sludge, poor settling, excessive rising speed, biogas pipe blockage, unreasonable design of the bottom water distributor, unreasonable design of the three-phase separator, insufficient sludge bed mixing, sludge poisoning and death, etc.
When dealing with sludge loss problems, it is necessary to first analyze the cause of the problem and then take corresponding treatment methods.
Problem Analysis
Check sludge activity: After arriving at the site, we first check the quality of the anaerobic sludge, such as color, particle size, elasticity, settling function, VSS/TSS, activity, etc. The inspection results are all normal.
Check the accuracy of the test: Blind tests were conducted using standardized samples, and the test results were also accurate.
Check operating parameters: The anaerobic reactor temperature is 35℃, the PH value is about 7.0, the rising flow rate is 4～6m/h, the influent TSS <500mg/L, the pre-acidification policy, etc., are all normal, and the concentrations of ammonia nitrogen and total phosphorus are also within the normal range.
All policies are normal, which is already very normal. There were no sludge problems in previous operations. Why did sludge loss occur at the very beginning? This requires starting debugging to find the reason.
By searching the work records, it was found that when the system was started, the applied water load was about 0.05kgCOD/kgVSS.d. At this time, the VFA of the anaerobic wastewater was about 280mg/l. In order to speed up the start-up process, whenever the VFA dropped to 200mg/l, it would increase by 0.02kgCOD/kgVSS.d.
When the anaerobic tower is running, it is usually best to control the VFA of the wastewater below 200mg/l. In this project, when restarted, although the anaerobic sludge was compensated, the VFA of the wastewater has been very high, indicating that the reason is "the activity of the anaerobic sludge cannot be obtained, and the load increased too quickly," leading to sludge loss. "Inactivity" may be due to the low activity of the sludge itself, or part of the sludge is in a dormant state, coupled with the fact that the sludge source comes from the sludge tank and is in a dormant state. It is estimated that the reason for the sludge is that the anaerobic sludge active repair is relatively slow and cannot adapt to the growth rate of the load.
Methods and Effects
In the subsequent debugging process, the load was reduced and the speed was increased. When the anaerobic wastewater treatment policy was normal and the wastewater VFA was less than 100mg/L, the load would gradually increase. After 10 days of debugging, the anaerobic reactor successfully restored its original treatment capacity.
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
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