Nanjing University

Nanjing University & Yancheng Academy of Environmental Protection Technology and Engineering

Guang Zhang

Aimin Li

Chendong Shuang

Ke Wang

Ting Ye

Zheng Wang

Tong Li

Liang Tan

Juntian Wang

Shuangshuang Li

The present invention belongs to the technical field of water treatment, and in particular to a magnetic powder strengthened method for removing nitrate nitrogen and inorganic phosphorus, which includes the following steps: (1) mixing permanent magnetic material powder with paramagnetic Fe3O4 powder, and magnetizing the mixture in a magnetic field to prepare magnetic powder; (2) adding the magnetic powder directly or in a form of granular filler into a water treatment reaction vessel; and (3) allowing the to-be-treated water to enter the water treatment reaction vessel, performing a chemical reaction of removing nitrate nitrogen and inorganic phosphorus in the presence of a reducing agent, and discharging the water after the reaction is completed. By adopting the method of the present invention, a uniform and fine magnetic field can be provided, thus the reaction efficiency is improved, and the process is simplified and the cost is lowered.

Magnetized powder strengthened method for removing nitrate nitrogen and inorganic phosphorus

A magnetic strong base anion exchange resin with high mechanical strength and a preparation method thereof, belonging to the field of resin materials. The preparation method comprises steps of: adding a conventional strong base anion exchange resin to a mixture of trivalent iron salt and divalent iron salt, and then mixing the resin adsorbed with the iron salt with aqueous ammonia so that FeOnanoparticles are contained in the resin structure. Then, the resin containing FeOnanoparticles is added to alcoholic solution dissolved with silane coupling agent to form a dense SiOcoating on the surface of the resin, so as to obtain magnetic strong base anion exchange resin with high mechanical strength.

Magnetic strong base anion exchange resin with high mechanical strength, and preparation method thereof

In view of the current pollution to sewage by nitrate nitrogen, the present invention discloses a method for promoting denitrification to remove nitrate nitrogen in water by magnetic resins. In the method disclosed by the present invention, magnetic anion exchange resins are in contact with and mixed with sewage, and nitrate nitrogen in the sewage is removed quickly and efficiently by both the ion exchange between the magnetic anion exchange resins and the nitrate nitrogen in the sewage and the denitrification enhanced by the magnetic material. Meanwhile, the regeneration and recycle of the magnetic anion exchange resins are realized by the denitrification of microorganisms.

Method for promoting denitrification to remove nitrate nitrogen in water by magnetic resins

Growing community of inventors

Nanjing, China

Guang Zhang