Recently, the method of “Steam Mud Extraction and Sludge Treatment†invented by Xu Yuanjian, a researcher of the Environmental Friendly Chemical Process Research Center of the Chongqing Institute of Green Intelligent Technology, Chinese Academy of Sciences, was granted a national invention patent (Patent No. ZL201410468152.4).
The invention provides a new method for the treatment of urban sludge by steam: First, the urban sludge is placed in a material box and placed in the middle of a closed reactor, and then the reactor is evacuated and high-temperature steam is introduced from the upper part. The steam is used to heat the sludge, break the cells, and dissolve the organic matter. The organic-rich extract is separated from the sludge by the action of gravity and collected at the bottom of the reactor. In this way, the extract can be used as a liquid fertilizer, soil improver, and a denitrification carbon source in a sewage treatment plant. The residual sludge with low organic matter content can be reused as building materials and land after simple dehydration or natural air drying. Or landfill, etc. are completely disposed of.
The invention adopts the method of “steaming†instead of the traditional hydrothermal treatment “cooking†to realize that the sludge is only in contact with steam at all times, the equipment does not need to be stirred, the single-batch processing capacity is large, the treatment efficiency is high, and the reduction of the urban sludge can be realized. Resource and harmless treatment.
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