Method and device for purifying water by means of strong magnetic separation-magnetic biomass charcoal absorption

Abstract

The invention discloses a method and a device for purifying water by means of strong magnetic separation-magnetic biomass charcoal absorption. The method combines a strong magnetic separation technology and a magnetic seed absorption technology, and adopts micron-scale superparamagnetic biomass charcoal as a magnetic seed; due to a reticular structure of chitosan magnetic particles loaded on the surface of the magnetic biomass charcoal, the specific surface area of the magnetic biomass charcoal is enlarged, and pollutants are facilitated to be absorbed; furthermore, the magnetic particles in the magnetic biomass charcoal exist in a form of a stable Fe3O4 crystalline state and have superparamagnetism, so that the magnetic biomass charcoal has a better absorption effect. The invention further optimizes a traditional strong magnetic separation system and simplifies recovery equipment, thus greatly reducing the adding amount of a coagulant and the energy consumption of treatment, and lowering the recycling cost of the magnetic seed.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a water purification method and device for strong magnetic separation-magnetic biomass carbon adsorption. Background technique [0002] Magnetic separation technology used in water treatment engineering is a new technology. Since the 1960s, the Soviet Union has used magnetic coagulation to treat dust removal wastewater from steel mills. In the late 1960s, American MIT professor Kom invented the high-gradient magnetic filter. In the 1970s, the United States applied magnetic flocculation and high-gradient magnetic separation to treat wastewater from iron and steel, food, chemical industry, and papermaking. In my country, from the mid-1970s to the early 1980s, the magnetic coagulation method, magnetic disk method, and high-gradient magnetic separation method were used for the treatment of steelmaking and steel rolling wastewater. In recent years, magnetic sepa...

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Problems solved by technology

Although natural magnetite is cheap, it has many impurities, poor magnetic response, small adsorption capacity, and the risk of secondary pollution; the organic film magnetic powder is Fe covered with a polymer organic film. 3 o 4 , after adjusting the PH value in the recovery process, the surface Zeta sites are transformed, and the magnetic powder is separated from the floc gel, but the synthesis process requires N 2 protection, some raw materials are toxic, and the synthesis cost is high, so it is rarely used in strong magnetic separation technology

The above two kinds of magnets have high remanence intensity, and both of them need to be demagnetized during the recycling process, which increases the processing energy consumption and recycling cost.

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