1. Technical introduction
The carbonization (dry distillation) method is a breakthrough resource-based solid waste treatment high-tech. It can fundamentally solve the problem of the treatment and disposal of sludge and other organic solid waste. It is one of the advanced means to realize a green ecological civilization and build a waste-free city. .
Carbonization technology is an advanced environmental technology that treats sludge and other organic solid waste under anoxic conditions without secondary pollution. Since there is no direct combustion of sludge, the dry distillation process is under anoxic conditions, and the control of the heating temperature determines that the dry distillation/carbonization process does not have the conditions to produce dioxins. The products after dry distillation include water, combustible biogas and biochar.
The water evaporates during the drying process, and can be discharged up to the standard after a simple treatment after condensation. Combustible biogas is introduced into combustion and reused, which not only greatly reduces flue gas emissions, but also makes full use of its combustion calorific value to achieve energy saving and reduce operating costs. Biochar has stable chemical properties and is rich in nutrients such as nitrogen, phosphorus and potassium. It can be used as soil amendments, adsorption materials, organic fertilizer additives, and microbial carriers. The harmless effect is obvious. High temperature treatment (above 200oC) can kill all sludge pathogens, and dry distillation can also solidify heavy metals in the sludge. Biochar has a microporous structure and strong adsorption capacity, which can significantly improve soil physical and chemical properties and micro-ecological environment, and effectively improve soil fertility. Scientific research shows that biochar has the effect of retaining water and fertilizer, can reduce the amount of fertilizer used, not only reduces the cost of farming, but also reduces the pollution of groundwater. In recent years, the role of biochar in solving global ecological environmental security and sustainable agricultural development has been universally recognized, and has been hailed as "black gold" by academia. Many countries have established special institutions to study the theory and application prospects of biochar.
2. Development prospects under the situation of carbon peak and carbon neutrality
The carbonization treatment truly realizes the harmlessness, reduction and resource utilization of sludge treatment. The carbon element in the sludge is mainly converted into biological carbon, which greatly reduces the emission of carbon dioxide. It is a high-tech project with a low-carbon economy and is the general direction of the current world sludge treatment technology trend.
In particular, General Secretary Xi Jinping's speech at the United Nations Biodiversity Summit (September 30, 2020) "... China will uphold the concept of a community with a shared future for mankind, continue to make arduous efforts, increase national independent contributions, and adopt more powerful policies and measures. , Strive to reach the peak of carbon dioxide emissions before 2030, strive to achieve carbon neutrality by 2060, and make greater efforts and contributions to the realization of the goals set by the Paris Agreement to address climate change.” And proposed that the green economy is the development of mankind. Trends are also the key to promoting recovery.
Under the goal of carbon peak and carbon neutrality, carbon indicators are a very important indicator of green development. Companies should take carbon reduction as a long-term direction and choose a low-carbon technology route.
We believe that with the encouragement and support of such an international situation and relevant national policies, this technology can provide an effective way for the healthy development of the sludge/organic solid waste treatment industry, and also open up a new blue ocean for the carbonization technology application market. .
3. Application of sludge carbonization technology and project development
To actually apply carbonization technology to solid waste treatment such as sludge, large-scale stable operation and reduction of energy consumption must be solved. Our company's successful experience in this area has won favor and became a cooperative operator of China Resources Group.
