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The heat-free sludge drying technology was recently completed in Qinhuangdao Development Zone, Hebei Province, and the industrial transformation was completed. The first production line has been running stably for 4 months, creating significant social and economic benefits. The dried sludge biomass fuel has a high calorific value and a pollutant content far below the national standard. It is sent to waste incineration power plants for incineration and power generation, which has significant energy saving and environmental protection effects.
It is understood that the proportion of "landfill" treatment of municipal sludge in the country is still more than 50%. A large amount of wet sludge is transported, buried or piled, causing pollution to the air, water bodies, and soil. It has a great impact on the lives of surrounding people and brings social problems that are becoming increasingly prominent. In China's "13th Five-Year Plan", it is clearly pointed out that "sludge treatment is one of the three main directions of environmental protection in China", and the "Water Ten" requires that "the harmless treatment and disposal rate of urban sludge should reach 90% by 2020. ".
How to overcome this worldwide problem? Zhang Xiaochun, Chairman of Qinhuangdao Nico Environmental Technology Co., Ltd. and inventor of sludge non-heat drying technology, proposed the new concept of "non-heat drying" of sludge for the first time in the world, and led the research and development team to overcome this problem for 8 years . According to reports, the core feature of this technology is "ultra-low energy consumption and no odor generation." Using this technology to treat wet sludge with a moisture content of 80% to 85%, 1 kilowatt-hour of electricity can dewater about 100 kg, which is about 20 times that of thermal drying technology; it can reduce the sludge moisture content to about 40%; The mud reduction is about two-thirds. There is no odor during the whole treatment process and no secondary pollution will be caused. The dried sludge can be used as resources, such as incineration for power generation, building materials, composting, etc.
Recently, the provincial and municipal organizations organized relevant * groups to evaluate this project and concluded that the integrated technology of the project has solved the bottleneck problem of sludge treatment and laid the foundation for sludge disposal, especially resource utilization, and its technical achievements have reached international standards. *; "Dynamic sealing all-round water squeezing device" has reached the domestic level. "This technology has independent intellectual property rights, and has broad application prospects in the fields of deep sludge dehydration, sludge drying, and sludge resource utilization, and it is worthy of large-scale promotion." Member of the evaluation* group, a doctoral student in environmental engineering of Yanshan University Instructor Professor Zhang Qingrui said.
According to relevant application certificates, from April to June this year, waste incineration power plants continuously received sludge biomass fuel processed by the "sludge heatless drying technology", generating 414kwh per ton, increasing the output value by 269 yuan. At present, “sludge heatless drying technology†and related equipment have obtained 3 utility model patents, and 3 invention patents have been announced.
"The sludge heatless drying technology realizes the reduction, stabilization, and resource utilization of sludge treatment and disposal. Regardless of the energy consumption, the service life of the equipment, the operating cost and the back-end resource utilization, it has very The powerful advantages have completely solved the problem of final disposal of sludge that has plagued local government management departments for many years." Zhang Xiaochun said.
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