With the accelerating process of urbanization in China, more and more urban people are living in cities and towns, and the problem of urban sewage is facing us, which not only hinders the economic development of our country, but also seriously damages the environment. Due to the different economic development status, geographical location, overall planning layout and urban management and operation efficiency of different regions in China, urban pollution Water pipe The level of management and treatment is uneven, and there are many problems that need to be solved.
Urban sewage mainly includes domestic sewage, industrial wastewater and runoff sewage, of which domestic sewage and industrial wastewater are the main sources of urban sewage. Domestic sewage mainly includes a series of sewage such as bath water, laundry water, toilet flushing water, kitchen water, etc. They contain more domestic impurities, have good biodegradability, and are highly feasible for recycling.
Chinatown town Current situation and problems of sewage treatment
During the ten years from 2008 to 2018, the national sewage treatment capacity has doubled, which is a remarkable achievement. By 2018, the national drainage pipeline has exceeded 1 million kilometers, and the sewage treatment capacity has exceeded 200 million cubic meters/day, forming a "100+2" sewage collection and treatment capacity, which has become the basic material basis for China's water pollution control. However, this system has not yet given full play to its due environmental benefits, but also needs to improve quality and efficiency.
The low quality and low efficiency of urban sewage treatment are highlighted in two aspects: first, the low rate of pollutant collection and treatment, a large number of pollutants into the water body, resulting in black odor; Second, the waste water treatment process consumes large resources, resulting in high costs and large sludge production. Only by fully understanding the essential causes of these two problems can we find the best way to improve quality and efficiency and achieve accurate quality and efficiency improvement.
our country town Future development trend of wastewater treatment and reuse
1、 Favorable policies further stimulate the vitality of urban sewage treatment market
Urban sewage treatment is one of the important market segments in China's sewage treatment industry. With the acceleration of China's urbanization process and The continuous deepening of "smart city" has provided a broad development space for China's urban sewage treatment market. According to the "13th Five Year Plan" National Urban Sewage Treatment and Recycling Facilities Construction Plan, by the end of 2020, the urban sewage treatment rate should reach 95%, the county sewage treatment rate should not be less than 85%, and Beijing Tianjin Hebei, Yangtze River Delta, Pearl River Delta and other regions should achieve the goal one year ahead of schedule. The scale of sewage treatment facilities should be increased from 217.44 million cubic meters/day at the end of 2015 to 267.66 million cubic meters/day at the end of 2020, with an increase of 50.22 million cubic meters/day, a compound growth rate of 4.24%. The scale of sewage treatment facilities should be upgraded to 42.2 million cubic meters/day. It is expected that the "14th Five Year Plan" will further promote the upgrading and reconstruction. In addition, in the In 2019, the three departments issued the Three Year Action Plan for Improving Quality and Efficiency of Urban Sewage Treatment (2019-2021), aiming to promote the transformation and construction of domestic sewage collection and treatment facilities and further stimulate the vitality of the urban sewage treatment market.
2、 routine Equipment and Mature technology and continuous emergence of improved processes
At present, water environment treatment technologies, except physical and chemical methods, belong to the category of biological methods. The biological process can be divided into activated sludge process and biofilm process. From the perspective of the development history of wastewater biological treatment, the biofilm method was born before the activated sludge method. Although the early biofilm method has the characteristics of high biomass, good purification effect and low energy consumption compared with the activated sludge method, its application in large-scale wastewater treatment projects is limited due to its low hydraulic load and organic load. Therefore, at present, domestic sewage treatment plants mostly adopt activated sludge process and its derivative processes, such as: A2O process, SBR process, oxidation ditch process, AO process, etc. In general, water treatment technology is constantly innovating. Some technologies have more advantages than the traditional activated sludge process in terms of effluent quality, investment cost, operation management, applicability, etc. In the future, there will be more application space in the aspects of standard upgrading and transformation, sewage regeneration and reuse.
Nevertheless, The improvement of sewage treatment equipment and the progress of sewage treatment technology also need to do a good job in management. The government departments should further improve the supervision and management ability of sewage treatment, actively organize and carry out professional skills training for sewage treatment personnel, focus on improving the management ability and business level of staff, improve the water inlet and outlet detection system, use modern information technology, and strengthen the real-time supervision ability.
Compared with the previous years, China's urban sewage treatment has been greatly improved, not only because of the constraints of national policies, but also because of the strengthening of our environmental awareness. Sewage treatment is not only the responsibility of enterprises, but also the responsibility of every citizen. We have a long way to go in sewage treatment!
two 021 WEC [International Environmental Protection Exhibition] will cooperate with June 2- four Opening at Shanghai National Convention and Exhibition Center Hexu, Kubotian, Zeheng, Bomei, Baolu, Zhengjing 、 Shiputai 、 Bishui Water 、 Jin Duo and Yu Chen 、 Hengyuan And other brand enterprises to display new technologies and equipment in the field of rural sewage treatment. At the same time, the exhibition will also hold a seminar on practical technology of rural sewage treatment, which will deeply discuss the policy standards, technology applications and future development trends of rural sewage treatment through the collision of ideas among industry experts, managers, enterprise technicians and other parties.
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