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The function and selection of a scraper
Release time:
2022-12-12 13:38
A scraper is a machine used to remove sludge from waterways. It is used in the larger circular sedimentation tanks of urban sewage treatment plants, waterworks, and industrial wastewater treatment plants to remove sludge settled at the bottom of the tank and skim off the scum on the surface. Hanke Environmental Protection Company produces various types of scrapers, including peripheral drive scrapers, central drive scrapers, central drive thickening scrapers, central drive suspended scrapers, gantry scraper skimmers, gantry crane type rake scrapers, chain plate scrapers, screw conveyor scrapers, cantilever central drive scrapers, and parallel gantry scrapers.
The central drive thickening scraper mainly consists of an overflow device, main beam and guardrail, inlet pipe, transmission device, electrical box, calming tube, main shaft, scum rake, scraping device, underwater bearing, small scraper, sludge hopper, and scum rake. The central drive thickening scraper can further separate the free water in the sludge of the thickening tank to reduce the volume of sludge, increase the sludge concentration, and discharge the thickened sludge out of the tank.
First, it's important to clarify where the scraper is used. The wastewater in the primary sedimentation tank contains a large amount of solid particles and a high sand content, so the scraper's designed retention time cannot be too long, and the scraper needs to operate quickly. In contrast, the wastewater in the secondary sedimentation tank contains more small sludge particles, and the sludge is mainly activated sludge. If the scraper's retention time is too short, the sludge will not settle easily, so the scraper's operating speed should be designed to be slower. The primary sedimentation tank mainly needs to scrape the sludge to the sludge hopper, while the secondary sedimentation tank needs to suck out the activated sludge settled at the bottom of the secondary sedimentation tank. Therefore, the scraper in the secondary sedimentation tank is accurately speaking a sludge suction machine, and the secondary sedimentation tank sludge suction machine is usually equipped with a scraper plate to assist in sludge suction, so it is also called a scraper suction machine.
Next, there's the difference between peripheral and central drive, and half-bridge and full-bridge types in sedimentation tanks. Depending on the diameter of the sedimentation tank, the load-bearing capacity of the sedimentation tank varies. Generally, sedimentation tanks with a diameter greater than 18 meters will use a central drive scraper, while smaller sedimentation tanks will use a peripheral drive scraper. Compared with the half-bridge type peripheral drive scraper, the full-bridge type peripheral drive scraper has a cycle that is only half as long, can handle more sludge, and is suitable for occasions with good sedimentation performance and a larger amount of sludge.
Scraper, microporous aerator, paper mill wastewater
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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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