The invention discloses a sequencing batch internal circulation biological
denitrification process. The process mainly comprises four steps of water feeding, biological
denitrification reaction,
precipitation and water and mud
discharge. The biological
denitrification reaction comprises an internal circulation reaction from short-
cut nitrificaition treatment to deoxidation treatment, anaerobic
ammoxidation treatment and to the short-
cut nitrificaition treatment, and the short-
cut nitrificaition treatment, the deoxidation treatment and the anaerobic
ammoxidation treatment are carried out in three intercommunicated different reaction areas of one reactor. The invention further discloses a biological denitrification device. The device is separated into three intercommunicated reaction areas, that is, a short-cut nitrificaition treatment reaction area, a deoxidation treatment reaction area and an anaerobic
ammoxidation treatment reaction area. The device is further equipped with an aerating device, an internal circulation pump, a water
distributor and the like. The process has the advantages of convenient operation management, low
energy consumption, high denitrification efficiency and stable
treatment effect, and the device matching the process has the advantages of compact structure, convenient use, low cost and the like.