| abstract |
The invention relates to a preparation method of nano magnetic material loaded mineral soil for reducing COD (chemical oxygen demand) and heavy metals in feces, biogas slurry and wastewater, which is implemented by adding FeCl into 2 ·4H 2 O and FeCl 3 ·6H 2 Preparing a mixed solution from O, heating, ultrasonically vibrating and stirring; addition of NH 3 .H 2 O solution, reaction curing and cooling; performing magnetic separation and cleaning to obtain nano Fe 3 O 4 Magnetic fine particles; mixing nano Fe 3 O 4 Magnetic particles are stirred and dispersed in deionized water and treated by ultrasonicShaking, adding water solution of coating agent, and reacting to obtain Fe 3 O 4 Fully adsorbing, cooling and cooling to prepare the nano Fe 3 O 4 A magnetic fluid; preparing the mineral soil into suspension, and then adding the nano Fe 3 O 4 And (3) conducting ultrasonic oscillation dispersion on the magnetic fluid, then introducing the magnetic fluid into a crystallization reaction kettle for crystallization, and washing the magnetic fluid to be neutral to prepare the nano magnetic material loaded mineral soil. The nano magnetic material of the invention loads mineral soil, can prevent the nano magnetic material from aggregating in the treatment process, can greatly reduce the aggregation degree of the magnetic nano particles, form a magnetic composite material, and effectively reduce COD and heavy metals in wastewater. |