Beijing plans to reduce 4260 tons of water polluta

2022-08-16
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This year, Beijing plans to reduce 4260 tons of water pollutants

COD emissions in the first quarter are 5% lower than the same period last year

this year, Beijing plans to reduce 4260 tons of water pollutants

in the first quarter, 22 urban sewage treatment plants in the city treated 224 million cubic meters of sewage, reducing 87900 tons of water pollutants, and COD emissions are 5% lower than the same period last year. This year, the city plans to cut 4260 tons of water pollutants and reduce COD emissions by 4.0% over last year

chemical oxygen demand (COD) is a commonly used comprehensive index to evaluate the degree of water pollution. It reflects the degree of organic pollution of water bodies. The higher the COD, the more serious the pollution is. China takes COD as the key water pollutant index to be controlled

yesterday, I came to Gaobeidian sewage treatment plant, the largest sewage treatment plant in the city. Every day, 1million tons of sewage flow in. 200 tons of these black and smelly sewage are water pollutants. After 16 hours of purification, only 10% of the water pollutants are left in the discharged reclaimed water, and the COD reduction rate reaches 90%

under the guidance of technicians, we learned how 90% of COD disappeared. Sewage enters the factory and passes through the grille, pump room, aerated grit chamber and primary sedimentation tank in turn. After these processes, 70% of water pollutants become sludge, which can become a fertilizer source for agriculture and greening after deep processing. Next, the soft tactile treated sewage with primary foams like Cr, SBR or PU comes to the secondary sedimentation tank. After deep purification technologies such as coagulation sedimentation filtration and membrane treatment, the pollutants in the water are decomposed into inorganic substances such as carbon dioxide and water for discharge. Finally, in the reclaimed water that meets the secondary discharge standard, the COD content is only 10%

improving the sewage treatment rate is an important measure to reduce the COD discharge and utilization prospect. At present, a total of 22 sewage treatment plants have been built in the urban area and new towns of the city, which can purify 2.25 million cubic meters of sewage every day. 31 centralized sewage treatment facilities have been built in suburban towns and townships, with a daily treatment capacity of 145000 cubic meters. From 2000 to 2007, the urban sewage treatment rate increased from 38% to 92%, and the COD reduction and removal rate increased from 30% to 80%. Last year, the city treated 990million cubic meters of sewage and reduced COD by 330000 tons

in addition to increasing the sewage treatment rate, reducing sewage discharge is also an important measure to reduce COD. The city has successively formulated measures such as the "Beijing ten building blocks must be combined with billions of Lego building blocks currently in use in the world from 1 to 5 to monitor the total emission reduction of major pollutants", established a monitoring system for key water pollution sources, formulated strict pollutant emission standards, and strictly controlled the increment of pollutants, such as environmental assessment and approval of construction projects. In recent years, Beijing No.2 Chemical Co., Ltd., Beijing tianlihai Chemical Co., Ltd., Pinggu Dongxing paper mill and other enterprises have been shut down, and the production facilities with serious water pollution have been demolished, which has successfully achieved shutdown and reduced COD emissions

with the enhancement of safety awareness and the improvement of environmental protection standards, the city has achieved remarkable results in COD emission reduction through a series of effective measures. In 2006, the city's COD emissions decreased by 5.2% compared with 2005, and in 2007, by 3% compared with the previous year. This year, the city's COD emission reduction plan is to reduce by 4% compared with the previous year

according to the technicians of the Municipal Water Affairs Bureau, the water pollution comes from all kinds of pollutants discharged from people's daily production and life. Sewage treatment plants play an important role in reducing pollutants in water and paying off water. However, once cod is produced, it cannot be completely eradicated. Therefore, the fundamental way to reduce environmental pollution is to advocate a healthy and environmentally friendly lifestyle, develop a green and environmentally friendly economic growth model, and reduce the emission of pollutants from the source

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