123 results about "Environmental restoration" patented technology

The invention discloses a sludge-based magnetic nitrogen-doped biochar catalyst and a preparation method thereof, and belongs to the field of sludge resource utilization and the field of environmentalrestoration. The preparation method comprises the following steps: carrying out ultrasonic mixing of concentrated sludge and a certain amount of nitrogen-rich compounds and biomass wastes from urbansewage treatment plants, papermaking sewage treatment plants or industrial park sewage treatment plants, drying, ball-milling, placing the raw materials into a crucible, capping and sealing, and roasting at a high temperature in a muffle furnace to finally prepare the magnetic nitrogen-doped biochar catalyst which has high catalytic activity and high stability and is easy to separate and recycle.The catalyst can be coupled with an oxidizing agent peroxymonosulfate (PMS) to efficiently degrade and even mineralize refractory organic contaminants in a water body. The preparation method providedby the invention has advantages as follows: sources of the raw materials are wide; reaction condition is mild; preparation cost is low; and the preparation method is green and environmentally-friendly. Sludge and biomass wastes from sewage treatment plants that are hard to treat are recycled, and the pollution problem of refractory organic matter in a water body is also solved. The catalyst of theinvention has a broad application prospect in the field of sludge resource utilization and the field of environmental restoration.