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Construction of urban sewage and garbage treatment facilities has made outstanding progress
Release time:
2022-12-30 14:45
During the 11th Five-Year Plan period, the Chinese government attached great importance to the construction of urban sewage and garbage treatment facilities, regarding it as an important means of promoting energy conservation and emission reduction and improving environmental quality. Special plans for the construction of sewage and garbage treatment facilities were formulated, relevant preferential policies were improved, investment was continuously increased, and the construction of urban sewage and garbage treatment facilities was actively promoted. Enthusiasm for social investment in the construction of urban sewage and garbage treatment facilities soared, promoting the development of the environmental protection industry and laying a solid foundation for the comprehensive achievement of the target of reducing chemical oxygen demand (COD). The achievements in the construction of urban sewage and garbage treatment facilities are mainly reflected in three aspects:
First, the sewage and garbage treatment capacity and treatment rate have increased significantly. In five years, the national urban sewage treatment capacity increased by 65 million tons/day, and the harmless treatment capacity of garbage increased by 200,000 tons/day; the sewage treatment rate in cities at the prefecture level or above increased from 51.95% to 75.25%, and the harmless treatment rate of garbage increased from 37% to 71.3%. By the end of 2010, 16 provinces (municipalities and autonomous regions), including Beijing, Shanghai, Zhejiang, Henan, Shandong, Jiangsu, Anhui, and Tianjin, had completed the construction of sewage treatment plants in every county, and four provinces, including Jiangsu, Zhejiang, Henan, and Hebei, had completed the construction of garbage treatment facilities in every county.
Second, it has promoted the development of the environmental protection industry. Enterprises in China's sewage and garbage treatment sector overcame the negative impact of the international financial crisis, with rapid growth in sales revenue, greatly driving the development of the environmental protection industry. By 2010, there were more than 20 enterprises in China's domestic sewage and garbage treatment sector with an annual sales revenue exceeding 1 billion yuan. Environmental protection equipment was rapidly upgraded, and the level of environmental services significantly improved. Beijing Enterprises Water Group and Beijing Sanda Environmental Protection Group successfully expanded overseas, undertaking EPC projects for sewage and garbage treatment in some Southeast Asian and Middle Eastern countries. Chongqing Iron and Steel Group Environmental Protection Investment Company, through the introduction, digestion, and absorption of advanced foreign technologies, produced garbage incinerators that are widely used domestically, and its independently developed garbage incinerators have been exported to North America. Chinese environmental protection enterprises are gradually gaining recognition in the international market.
Third, new technologies and equipment are constantly emerging. With the increasing demand for the construction of urban sewage and garbage treatment facilities nationwide, relevant environmental protection enterprises actively tackled technical challenges in the market, increased investment in technological innovation, actively cooperated with scientific research institutions, conducted technological research, formed an integrated development model of "production, education, and research," and developed a large number of urgently needed governance technologies and equipment. In the field of sewage treatment, a number of new products have been launched in areas such as complete sets of equipment, membrane separation equipment, and new agents. At the same time, significant breakthroughs have been made in the harmless treatment technology of sludge and the technological improvement and innovation of conventional sewage treatment processes. In the field of garbage treatment, technologies and equipment such as comprehensive treatment, cement kiln co-processing, comprehensive treatment of leachate, and resource utilization are constantly enriching the market.
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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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