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Compared with high energy consuming industries such as steel and chemical industry, the energy consumption of water system has been neglected for a long time because of its relatively low energy consumption. But in fact, sewage treatment plants occupy the top ten in high energy consuming industries.
Although most water treatment plants in China need to be upgraded, if they are carried out in the way of high energy consumption, the cost of sewage treatment will increase. In addition, some small and medium-sized sewage treatment plants will be difficult to operate, and the emission reduction benefits of sewage treatment plants will not be brought into normal play.
Wang Hongchen, vice president of the school of environment of Renmin University of China, previously said that the energy consumption of the sewage treatment plant is mainly power consumption. The power consumption per ton of sewage treatment is about 0.2-0.3 degrees, and the power charge accounts for about 50% - 70% of the sewage treatment cost.
The energy consumption of urban water supply and sewage treatment systems in the United States accounts for about 3% of the total power production in the whole year. At present, there are more than 3800 sewage treatment plants in China, and the energy consumption accounts for about 0.3% of the power consumption of the whole society. However, with the improvement of people's requirements for water quality and the national control of high-energy consumption industry, the energy consumption proportion of sewage treatment plants will continue to increase, and will gradually approach the level of the United States.
Compared with the attention paid to energy conservation and consumption reduction in other industries, the society pays less attention to the energy consumption of sewage plants. At present, there is no national sewage treatment energy consumption quota standard, only the first local standard for sewage treatment energy consumption quota issued by Beijing at the end of 2014.
There are many ways to save energy and reduce consumption in sewage treatment plants, such as managing strong sewage treatment facilities, recovering energy by using the potential of sewage itself, using new materials, etc.
After analyzing nearly 3000 urban sewage treatment plants in operation in China, the World Resources Institute found that the energy consumption per unit pollutant varies greatly. In sewage treatment plants with the same process, the same scale and similar areas, the energy consumption difference can be as high as 6 times. This also means that strengthening the energy efficiency management of sewage treatment facilities can bring greater energy-saving space.
In addition, most people do not think that the potential contained in sewage is 10 times the energy consumption of sewage treatment. Wang Hongchen previously said that in Europe, the energy self-sufficiency rate of urban sewage treatment can reach more than 60% only by taking efficiency improvement and transformation measures aimed at energy conservation and consumption reduction and traditional technologies such as efficient anaerobic digestion and energy recovery. As early as the beginning of 2014, six experts, including Qu Jiuhui and Wang Hongchen, academicians of the Chinese Academy of engineering, pointed out that it was not advisable to exchange high energy consumption for the reduction of water pollutants, and proposed the concept of sewage treatment plant to significantly reduce the energy consumption of sewage treatment plant with the goal of energy self-sufficiency.
In addition, in terms of water treatment, many enterprises are also committed to providing their customers with products to reduce energy consumption, so as to save customers' costs in water treatment projects.
Larry, President of Dow energy and water treatment solutions ˙ In an exclusive interview with surging news recently, Ryan said that the current general direction of industrial water treatment is to "improve the recycling of sewage", "zero discharge", and then "zero discharge". However, the "zero discharge" has high requirements on the investment of water treatment system, high energy consumption and high operation cost. At present, many industrial water treatment projects mostly adopt the solution of "zero emission", so as to reduce energy consumption and ensure that the whole system is "affordable" to users while "minimizing emission".
Fang peihui, Greater China business director of Dow water treatment and process solutions business department, told surging news that Dow is also committed to reducing energy consumption and cost for customers. Dow applied the latest energy-saving reverse osmosis membrane xfrle-400 / 34i to the sewage reuse project of a chemical park in Shouguang, Shandong Province. On the premise of the same treatment effect, the energy consumption can be reduced by 30%.
The energy consumption of the project is reduced by 30%, and the energy consumption saved in one year can reach 2.8 million kwh, which is equivalent to the annual power consumption of about 2000 ordinary families in China. If all the electricity used comes from coal-fired power generation, it means that about 1000 tons of standard coal will be saved every year and 2800 tons of carbon dioxide emissions will be reduced.