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Scraper: Equipment principle and operation points of the scraper
Release time:
2022-12-12 13:38
Scraper The complete unit shall include: motor drive system (including reducer, motor and overload protection system); working bridge; intermediate column; perforated pipe and water retaining skirt plate for the distribution trough; effluent weir; scum removal system (including flushing equipment); support; sludge collecting pipe; truss placement and socket-type sludge valve, on-site control box and accessories required for safe and effective operation. The sedimentation tank sludge suction system adopts a peripheral drive scraper. The intermediate column frame, sludge suction pipe, and scum skimming are driven by an internal meshing gear device, and the sludge suction pipe collects the sludge along the bottom of the tank to the intermediate sludge discharge pipe, and then discharges it to the outside of the tank through the water pressure in the tank. To ensure that the concentration of return sludge is not less than 6g/L, sludge discharge control should be carried out at different sludge return ratios, and the required sludge discharge adjustment device should be provided.
The working bridge is a half-bridge type fixed installation, serving as a passage between the intermediate column and the peripheral platform of the tank, and should be suitable for work
Maintenance and management of personnel, the deflection of the working bridge should be less than 1/800 of the bridge span.
1) Outlet channel
a. The water distribution pipes of the peripheral inlet channels shall be provided by the equipment supplier according to the system requirements, and the peripheral water distribution system
The design should ensure the hydraulic balance of the sedimentation tank.
b. The outlet channel should distribute water evenly around the periphery, and the cross-section of the channel designed by the bidder should ensure that the water
Flows at a uniform speed in the distribution channel to prevent solids from settling in the channel.
The water flows into the tank at a low and uniform speed, then diffuses outwards, and returns to the peripheral outlet channel with a gentle circulation. The bidder should ensure that the inflow velocity does not cause any short-circuiting or vortexing. Allowing suspended solids to settle uniformly.
2) Effluent weir and scum baffle
a. Continuous triangular or intermittent triangular weir plates made of stainless steel are fixed on the outlet channel, the weir plate height is not less than 300mm, and the thickness is not less than 4mm. The weir opening size is determined by the bidder and should meet the needs of the effluent load.
b. The stainless steel scum baffle is also fixed on the outlet channel, with a thickness of not less than 4mm, and should intercept surface scum to prevent scum from entering the outlet channel.
3) Skimming device
The scraper should be equipped with a surface scum skimming device. The scum is skimmed into the scum discharge hopper for discharge, and at the same time, the sedimentation tank effluent is used for self-cleaning. The bidder should also configure a water filter container made of stainless steel mesh after the scum is discharged. The container is suitable for manual operation on the ground, separating the water and flowing into the sewer.
Sludge scraper, paper mill wastewater, chemical fiber wastewater
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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