A considerable amount of the oyster shells as a waste product of mariculture is produced every year, which leads to a major disposal problem with coastal regions of China.

No abstract

No abstract

A magnetic short-range denitrification reactor was constructed by using an external magnetic field, the influence of magnetic field on the accumulation characteristics of nitrite nitrogen in the denitrification system was studied, and the mechanism of magnetic field was analyzed. The study found that the magnetic field helps to increase the accumulation of nitrite nitrogen, and when the strength of the external magnetic field is 50 mT, the nitrite nitrogen can reach 35 mg/L. The magnetic field improves the stability of the nitrite nitrogen accumulation process, and has a certain inhibitory effect on the entire denitrification process, but has a greater impact on the NO2– to N2 reaction process.