Pay equal attention to sludge and water, speed up the completion of sludge disposal facilities, solve the difficulties of sludge disposal, and realize harmlessness and promote resource utilization. Over the years, BEWG has continuously learned from the experience gained in water operations, systematically summarized, and formed a set of systematic guarantee system for the whole value chain of sludge, contributing to the smooth realization of the "dual carbon goal" in mainland China.
BEWG reshapes the complete circular economy industrial chain of resource reuse by deeply excavating and establishing the link between urban industrial resources and sludge treatment and disposal industry, and Qingdao Jimo Sludge Treatment and Disposal Center Project is one of the typical cases.
Jimo District of Qingdao City is a national model city for environmental protection, an excellent tourist city in China, and a provincial-level civilized city, ranking among the top 10 in the country in terms of comprehensive competitiveness. The Jimo District Government attaches great importance to sludge treatment and disposal, carries out special research, decides to establish a centralized sludge disposal center, and collects technical solutions nationwide. After several rounds of expert demonstration and technical route comparison, comprehensive consideration of land use, reduction, harmlessness, atmospheric impact, social stability and other factors, it was finally decided to use the carbonization process to treat sludge in situ. With years of professional experience and innovative water technology solutions, BEWG has been recognized by customers in the Qingdao Jimo Sludge Treatment and Disposal Center project.
Through the overall analysis and systematic planning from the sludge production end to the outlet end, taking the carbon slag outlet research as the starting point, and as one of the important bases for judging whether the process is feasible, a sludge carbonization process route with a treatment scale of 300t/d (moisture content of 80%) and "deep dehydration + drying + carbonization + flue gas purification + building materials utilization" was formulated.
In order to avoid secondary pollution during transportation, the project uses in-situ treatment of sludge generated by the sewage treatment plant. However, the on-site space conditions are very limited, and the construction area of the main workshop for drying and carbonization treatment is only 1,500 square meters, which is less than one-third of the normal design level. In this regard, we give full play to the advantages of our own "sludge and water synergy" technology, and through the transformation of the original sludge dewatering machine room of the sewage plant, the sludge disposal is divided into multiple modules and distributed in the original structure of the sewage plant, so as to efficiently complete the sludge treatment and disposal at the same time, compact and intensive use of land, and release the capacity of the urban environment.
In order to achieve the optimal disposal path, we have carried out the research on sludge characteristics, carbonization process design and development, process energy balance, drying and carbonization equipment research and development and carbon slag resource utilization, and formed five core process systems, including "sludge receiving and storage system", "sludge concentration conditioning and deep dewatering system", "sludge drying system", "sludge pyrolysis carbonization system" and "flue gas treatment system", as well as "carbon slag cooling and storage system", "compressed air and nitrogen system" and "industrial circulating cooling water system" The complete sludge carbonization process technology of the three auxiliary systems can meet the national standards for sludge disposal.
Sludge Disposal Project in Junan County, Linyi Region, Eastern Region. The project is located in the south of Huaihai Road, west of Junan Zhuoao Water Purification Co., Ltd., covering an area of 30 acres, with a total treatment scale of 150 tons / day, the main process is spray drying + rotary kiln incineration, which is implemented in two phases, with a construction scale of 100 tons / day and a long-term scale increase of 50 tons / day.
Low-carbon friendly, reduction and recycling. Under the goal of carbon peak and carbon neutrality, the environmental protection industry will usher in a new round of important window period, BEWG will further deepen the application and exploration of sludge disposal in many fields such as building materials recycling, water purification, and river ecological restoration, and actively explore a safer, more efficient and environmentally friendly diversified sludge treatment and disposal path, so as to contribute to the modernization of harmonious coexistence between man and nature.
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