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Reclaimed water reuse: What are the advantages of reclaimed water reuse in dyeing wastewater?
Release time:
2022-12-12 13:38
In the face of increasingly stringent wastewater discharge standards and the growing demand for energy conservation and emission reduction, the continuous economic growth and expansion of enterprises, coupled with water scarcity, will lead to rising water prices. Therefore, research and development of new technologies for treating dyeing wastewater Reclaimed Water Reuse and management skills are imperative. The integrated membrane process used in the reclaimed water reuse of dyeing wastewater can not only reduce the remaining organic matter and chromaticity in the water but also remove inorganic salts. More and more engineering examples show that the membrane integration process is a feasible technology for reclaimed water reuse in dyeing wastewater.
I. Sand filtration + UF + RO/NF treatment process
After the treatment of dyeing wastewater reclaimed water reuse, the CODcr, suspended solids, and turbidity in the wastewater are reduced. The water then enters the ultrafiltration system to remove smaller suspended solids, turbidity, and chromaticity before entering the subsequent RO/NF treatment system. This system retains pollutants in the wastewater, separating and concentrating pollutants to meet the water quality requirements for production reuse.
II. Pretreatment + RO/NF treatment process
After dyeing wastewater is treated by traditional biological or physicochemical processes, the effluent from the secondary sedimentation tank (with better effluent quality) is obtained. After the suspended solids and CODcr in the wastewater are effectively treated, the supernatant from the secondary sedimentation tank is further treated by a filter pool or high-efficiency sedimentation technology to remove suspended solids and turbidity, ensuring that the SDI of the effluent meets the requirement of <5 before entering the subsequent RO/NF treatment system. This system retains pollutants in the wastewater, separating and concentrating pollutants to meet the water quality requirements for production reuse.
III. MCR/MBR + RO/NF treatment process
After dyeing wastewater is treated by traditional processes, or if low-concentration wastewater is not treated, the concentration of organic pollutants and suspended solids in the wastewater is high. Using MCR or MBR treatment technology reduces organic pollutants and suspended solids in the wastewater before entering the subsequent RO/NF treatment system, retaining pollutants in the wastewater to meet the reclaimed water quality requirements.
Membrane bioreactor (MBR) technology organically combines membrane separation technology with biological technology, representing a new technology for reclaimed water reuse in dyeing wastewater treatment. It uses membrane separation equipment to retain activated sludge and macromolecular organic substances in the bioreactor, separating clean water and achieving simultaneous biochemical reaction and clean water separation, eliminating the need for a secondary sedimentation tank.
Swirling aerator, environmental engineering, paper mill wastewater, reclaimed water reuse
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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