Application

Pyrolysis carbonization technology: In an oxygen-free or anoxic environment, the sludge is heated to a certain temperature to decompose the macromolecular organic matter into small molecular substances and finally converted into biochar. Biochar has the characteristics of large specific surface area and rich surface oxygen-containing functional groups, and can be used as a catalyst, adsorbent and soil conditioner. At the same time, most of the carbon elements are converted into aromatic carbon and fixed in the biochar during the pyrolysis carbonization process, which is in a stable state. The pyrolysis gas produced can also generate carbon sinks for power supply, which can achieve carbon fixation and emission reduction.

Hydrothermal carbonization technology: catalytic conversion of activated sludge under high temperature and pressure conditions, and finally obtain solid carbonaceous products and liquid products. This technology can effectively reduce the volume of activated sludge and convert organic matter into renewable energy. Solid carbonaceous products can be used as renewable energy to replace traditional fossil fuels, and liquid products such as oil also have certain utilization value.

Engineering case application: Beijing Enterprises Water Group's Qingdao Jimo sludge treatment and disposal center project adopts the sludge carbonization process route of "deep dehydration + drying + carbonization + flue gas purification + building materials utilization", including five core process systems such as "sludge receiving and storage system" and three auxiliary systems, which can meet the national standards for sludge disposal and achieve sludge reduction, harmlessness, stabilization and sustainable development.

Prospects

Positive policy support: With the proposal of the "dual carbon" goal, the National Development and Reform Commission, the Ministry of Ecology and Environment and other ministries and commissions have issued a series of policies to support the application of pyrolysis carbonization technology in sludge treatment and other fields, and relevant standards are also constantly being improved, such as "Technical Requirements for Evaluation of Operation Effect of Sludge Pyrolysis Resource Equipment", etc., which provide policy and standard basis for the promotion of carbonization technology in sludge treatment.

Driven by environmental protection needs: With increasingly stringent environmental protection requirements, traditional sludge treatment methods such as landfill and incineration are facing more and more restrictions and challenges. Carbonization technology has the advantages of reduction, harmlessness, high degree of resource utilization, and low carbon emissions. It can better meet environmental protection requirements and is expected to continue to expand its share in the sludge treatment market in the future.

Resource recovery value is prominent: Sludge carbonization products have multiple uses, such as adsorbents for water treatment, soil conditioners for agricultural production, and renewable energy for power generation and heating. With the increasing prominence of resource shortages, the value of sludge carbonization technology in resource recycling will be more valued, promoting its further development.

Great potential for technological innovation: At present, there have been innovative studies such as microwave-assisted pyrolysis and co-pyrolysis of sludge and other biomass. In the future, with the continuous advancement of science and technology, carbonization technology is expected to achieve greater breakthroughs in improving treatment efficiency, reducing costs, and optimizing product performance, further enhancing its competitiveness in the field of sludge treatment.

Carbonization technology has demonstrated unique advantages and application value in sludge treatment. With the joint promotion of policy support, environmental protection needs, resource recovery and technological innovation, its development prospects are very broad. It is expected to become one of the mainstream technologies for sludge treatment and play an important role in achieving efficient sludge treatment and resource recycling.