The hottest new pattern of water control is brewin

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A new pattern of water control is brewing. Underground sewage treatment plants are gaining momentum.

release date: Source: environmental protection

when public environmental governance is raised to a new height, the importance of underground sewage treatment plants is becoming increasingly prominent. Compared with the treatment process of traditional surface sewage treatment plants that are completely exposed to the natural environment, the sunken reclaimed water system not only solves the problem of avoidance, but also has more obvious advantages in dealing with the epidemic, which can block the spread of virus and is conducive to disinfection management

since the investment of underground monomer construction is generally higher than that of above ground plants, its design and construction usually need to focus on the overall consideration of process treatment effect, floor area and other indicators. For example, in the design of underground sewage treatment plant, considering the limitations of underground space and investment, the design of structures (buildings) is relatively compact, and technically, the treatment process with small floor area is also used as much as possible. The whole or part of the buildings and structures of the underground sewage treatment plant are set in the underground space naturally formed or Manually Excavated below the ground. The operators can often carry out daily inspection, operation, maintenance and other production activities in the underground space

moreover, the underground perennial temperature difference is smaller than the ground temperature difference, and the water temperature is relatively constant, which is conducive to the stable operation of various sewage biological treatment processes. At the same time, the effluent standard is high, which can meet the requirements of reclaimed water reuse, and the surface is smooth and beautiful, so as to realize the recycling of water resources. The underground sewage treatment plant can be built independently or in combination with urban water environment comprehensive treatment projects and ecological complexes. The sinking sewage treatment plant can realize the "decentralized treatment and nearby reuse" of sewage, replenish the river with high-quality reclaimed water, and improve the water environment quality of the whole river and lake

the sewage treatment plant is "hidden" underground. What are the economic values? Generally, the investment cost of underground sewage treatment plants (4000-6000/m3) is 2-3 times that of aboveground sewage treatment plants of the same scale. However, if the land value and environmental value are considered, the "cost performance" of the underground sewage treatment plant is almost the same as that of the above ground type. Compared with the traditional sewage treatment plant, the underground water plant is built in the center of the city, which is convenient for the reuse of water quality and does not need to be managed. The transfer of noise producing equipment underground also reduces the requirements for sound insulation equipment, which has certain economic and social benefits

as the place can also be used for mechanical property experiments of other parts and components in underground closed management, the underground sewage treatment plant comprehensively treats the odor generated, which has no impact on the environment and the lives of urban residents. While saving the open space of the city, it will not affect the beauty of the surrounding landscape, and improves the value of the surrounding land resources, such as analytical instruments, experimental machines, optical instruments, surveying and mapping instruments and so on. However, the underground sewage treatment plant does not "simply sink" the sewage treatment plant on the ground, but re plans the functional zoning of the sewage treatment plant. Not only should the sewage process be advanced and the treatment efficiency be high, but also how to make it occupy less space underground, three-dimensional and three-dimensional layout, has also brought new challenges to the sewage treatment plant

the construction of underground sewage treatment plant consists of many subdivisional works, involving ground landscape, excavation and support of deep and large foundation pits, ventilation and lighting, etc. These subdivisional facilities are often enlarged or the construction standard is improved according to the actual situation. Because the underground water plant is a closed space, the deodorization requirements are higher than those of the above ground water plant. All treatment structures of the underground sewage treatment plant are located in a relatively closed space below the ground, so ventilation and deodorization are particularly important. It is necessary to ensure that the air quality in the underground closed space and the odor emission in the plant meet the requirements

but its disadvantages are also obvious. For example, the design and construction are relatively difficult, the direct investment and operation costs are relatively high, and the civil engineering expansion is difficult, with increased risk factors. Among them, the planning and construction requirements are high. The main structure of the underground sewage treatment plant is built underground. Once the construction is completed, the difficulty of reconstruction and expansion will greatly increase. Therefore, industry experts suggest that based on the research and engineering practice of deodorization in sewage treatment plants, the selection of deodorization process in underground sewage treatment plants should give priority to the biological treatment process, and the service life of the filler of the biological deodorization device should not be less than 15 years

the construction of underground sewage treatment plant will become a trend in areas with developed economy, high land resource tension and high environmental requirements. At the end of 2019, China's first technical standard for underground sewage treatment plants, "technical guidelines for underground urban sewage treatment plants", was officially released. In the catalogue of national advanced pollution prevention and control technologies (in the field of water pollution prevention and control) issued in the same year, the "eco sunken reclaimed water plant intensive construction and resource utilization technology" is also listed as the only sunken technology. Based on this, during the "13th five year plan" period (January 2016 February 2019), the number of underground sewage treatment plants has increased to 70, with a treatment capacity of more than 7million M/d

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