Several points about the development status and enlightenment of sludge treatment and disposal

    The utilization of sludge for building materials is a way of sludge resource utilization, which mainly includes the use of sludge and its incineration products to make bricks, cement, ceramsite, glass, and biochemical fiber
Dimension board etc. my country lags behind in the development of sludge building materials utilization. Although there are more researches on sludge brick making, there are not many practical engineering applications.
In view of the status quo of sludge, since 2003, major domestic cities have begun to try to carry out special plans for sludge treatment and disposal, and a series of discussions on their technical solutions

Certificate, such as:
1. Guangzhou City has adopted harmless treatment to make bricks in the near future, which will be used for agricultural fertilizer in the long term;
2. Shenzhen has completed a special plan for sludge, and plans to adopt thermal drying + incineration processes;
3. According to different circumstances, Shanghai adopts the policy of dispersing, intensive, and diversified technologies;4. Tianjin plans to build 3 sludge treatment plants, using sludge digestion power generation technology, but there is no final disposal method for sludge;
5. In 2008, the daily sewage discharge volume in Beijing was as high as more than 2000 kt. The harmless disposal and rational utilization of urban sludge of 800 kt per year is imminent. Land use will be
One of its main development trends;
6. The sludge treatment and disposal process of the sewage treatment plant in the Three Gorges Reservoir Area of ​​Chongqing City will adopt the semi-drying + landfill process.
The following is an introduction to the technical routes of sludge treatment and disposal in major cities.
The treatment and disposal of sludge in Shanghai is based on the area of ​​the sewage treatment system, and adopts the policy of decentralized treatment, intensive treatment, and diversified technology. In processing technology
According to the different conditions of each region and local conditions, appropriate treatment technology is adopted for each area, such as the sludge dewatering + drying in the Shidongkou and Zhuyuan areas.
+Incineration treatment technology, and Bailonggang area uses sludge anaerobic digestion + drying treatment technology. In terms of disposal technology, combined with the characteristics of Shanghai’s geographical location,
Under the guidance of greening, forest, solid waste and tidal flat planning, determine the main ways of sludge disposal in Shanghai, landfill covering soil, landscaping soil, production
Building materials, fertilizer making, mudflat filling, and saline-alkali land improvement are the main ways to dispose of sludge in Shanghai. In Shanghai’s sludge treatment and disposal plan, dehydration + drying + incineration + construction
Wood utilization and dehydration + solid aerobic fermentation + land utilization are the main processes, and the large-scale sludge treatment plant (the amount of sludge (Ds) is not less than
60t/d) Most of them consider the treatment and disposal plan of dehydration + drying + incineration + utilization of building materials. Smaller sludge treatment plants generally use dehydration + solid state
Oxygen fermentation + land use.
The treatment and disposal of sludge in Beijing is relatively diversified, mainly including sludge composting, sludge thermal drying, sludge incineration, and sludge making building materials. In addition, Beijing will emphasize

Research on the harmless treatment technology of urban sludge, the harmless agricultural technology of sludge, and the utilization technology of sludge for building materials. In its special plan. Land use will be the main development
trend.
There are 4 sewage treatment plants in operation in Tianjin. The sludge treatment adopts medium temperature anaerobic digestion technology to make the sludge basically stable, and then digest the sewage.
The mud is dehydrated to reduce the moisture content to between 70% and 80%. However, the dewatered sludge does not have a final treatment method and is only transported to the suburbs through various channels for dumping.
The planning of sludge outlets in Guangzhou will focus on comprehensive utilization of sludge in the near future, supplemented by sludge incineration, sludge landfill as a supporting facility, and sludge incineration in the long term. Sludge Comprehensive
Combined utilization is supplemented, and sludge landfill is used as a supporting facility.
Shenzhen has completed a special plan, and plans to use thermal drying and incineration. The basic idea is to use the waste heat of the power plant to dry the sludge, and the dry sludge is used as a low-quality fuel.
The materials are sent to small power plants for incineration, and the project is currently being implemented.
In summary, in our country, the sludge problem of sewage treatment plants has become one of the environmental problems urgently to be solved in our country. Sludge treatment in municipal sewage treatment plants
And disposal is not only a technical issue that requires further research, but also a conceptual issue that requires further attention and funding.
Support and policies need to be further inclined to environmental issues.
At present, there are many problems in the construction and operation of domestic urban sewage treatment plants. The financing methods, construction and operation methods represented by BOT and TOT are increasing.
The rise, this has solved the national municipal and environmental protection construction funding gap to a certain extent, but if the newly built and established sewage treatment plants only pay attention to sewage treatment, and ignore
Look at the treatment of sludge generated in the sewage treatment process. Then the result can only solve the water pollution problem on the surface, but actually caused a serious pollution problem.
The latter fundamentally caused water pollution such as groundwater. The vicious circle created in this way will cause great harm to our country’s environmental protection.
According to the investigation of the current research and application status of sludge treatment and disposal, the following points can be obtained about the development status and enlightenment of sludge treatment and disposal:
a. People pay more and more attention to sludge treatment. The construction of sludge treatment and disposal projects represented by the Shanghai Shidongkou sludge drying and incineration project is a sign of sludge in my country
Treatment and disposal have entered the project implementation stage;
b. In the sludge thickening process, the sludge gravity thickening tank with low efficiency and large area has been gradually eliminated, replaced by the application of mechanical thickening equipment and thickening-dewatering
Mass applications of integrated devices;
c. At present, the domestic sludge dewatering equipment is mainly belt filter press, and the product performance of the current domestic belt filter press has gradually moved closer to the world’s products, and
Integration of concentration and dehydration
Machine direction development. Centrifugal dewatering machine is widely used in foreign countries due to its high dewatering efficiency and small footprint. At present, large-scale and high-efficiency centrifugal dewatering has been developed in China.
Machinery, with the advancement of technology, the shortcomings of centrifugal dehydrator such as high noise are gradually reduced, and its application prospects are still relatively good;
d. Sludge drying technology is not widely used in China, and there are relatively few related equipment manufacturers. There is still a large gap between domestic technology and foreign countries.
There are many types of foreign sludge drying technology and equipment, but because they are less used in the country, they should be cautious when choosing.
Linkage of mud disposal process. In view of the high prices of foreign products, the introduction of foreign technology and the development of independent products at this stage are more suitable for my country’s national conditions than simply importing foreign products.
Or invest a certain amount of energy and funds to research and develop sludge drying technology and equipment suitable for my country’s national conditions.

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