NOVELTY - Device for continuously operating and strengthening biomembrane to remove phosphorus has water inlet tank, intermediate water tank and biological filter tank, where 2 one-way valves are installed on water inlet pipe of the biological filter tank (B1), which are connected to water inlet pump (P1) and intermediate water inlet pump (P2). The state of the water inlet pump is controlled by first electronic time controller (T1). The intermediate water pump, atmosphere connection top valve (V3) of the biological filter and air compressor (P3) are controlled by second electronic time controller (T2).    USE - A device for continuously operating and strengthening biomembrane to remove phosphorus (claimed).    ADVANTAGE - The device can achieve continuous biological phosphorus removal. The biological filter tank adopts anaerobic/aerobic alternate apposition growth system and takes quartz sand as biological carrier. Mixed flora biological membrane formed by phosphate-accumulating organism, normal heterotrophic bacteria, nitrifying bacteria and denitrifying bacteria is formed on surface. The device uses adjustable time program to control water-entering and water-discharging direction of the reactor. The biomembrane is exposed in anaerobic/aerobic environment alternately and cyclically. Nitrogen and organic substances in the wastewater can be removed.    DETAILED DESCRIPTION - A device for continuously operating and strengthening biomembrane to remove phosphorus comprises a water inlet tank, an intermediate water tank and a biological filter tank, where 2 one-way valves are installed on the water inlet pipe at the bottom of the biological filter tank (B1), which are connected to a water inlet pump (P1) and an intermediate water inlet pump (P2). The state of the water inlet pump is controlled by a first electronic time controller (T1). The intermediate water pump, atmosphere connection top valve (V3) of the biological filter and air compressor (P3) are controlled by a second electronic time controller (T2). Water outlet pipe of the biological filter tank is connected to one three-way valve; one end is that the backflow pipe is connected to the intermediate water tank; the other end is total water outlet pipe. The total water outlet pipe is connected to a wastewater outlet valve (V4). An INDEPENDENT CLAIM is included for continuously operating and strengthening biomembrane to remove phosphorus comprising:    (A) flowing the wastewater into the water inlet tank; regulating water quality and amount;    (B) sending the wastewater to the upflow biological filter tank from the bottom; and closing the valve at the top of the biological filter tank by the second electronic time controller; where the biological filter tank is in anaerobic state; the biomembrane on surface of the filler starts to release phosphorus at anaerobic state; and the anaerobic time can be regulated and controlled by the second electronic time according to quality of the wastewater, hydraulic load of the biological filter tank and growth condition of the biomembrane;    (C) flowing out the wastewater after phosphorus is released and organic substances are removed from the top of the biological filter tank; closing the waste outlet valve by the third electronic time controller; and flowing the discharged water of the biological filter tank to the intermediate water tank;    (D) when the phosphorus is released in the biological filter tank, stopping the water inlet pump and starting intermediate water inlet pump; where the atmosphere connection top valve of the biological filter tank and air compressor are connected by the second electronic time controller and start automatically; at this stage, the top of the biological filter tank is connected to the atmosphere; the air compressor provides oxygen to the biological filter tank; the biological filter tank enters into the aerobic state; the wastewater is lifted by the intermediate water inlet pump via the intermediate water tank, enters into the biological filter tank from the bottom; it uses biomembrane growing on surface of the filler to absorb phosphorus in aerobic state and absorb residual organic substance in the wastewater;    (E) because the biological filter tank operates continuously, the phosphorus content in the discharged water in the biological filter tank is number times of that in the entering water after the anaerobic/aerobic states are switched; flowing the water from the biological filter tank to the intermediate water tank; after the wastewater in the biological filter tank is replaced, directly discharging the treated aerobic water; starting the wastewater flowing valve by the third electronic time controller; and discharging the wastewater treated by the biological filter tank.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic diagram illustrating a device for continuously operating and strengthening biomembrane (Drawing includes non-English language text).    Biological filter tank (B1)    Water inlet pump (P1)    Intermediate water inlet pump (P2)    Air compressor (P3)    First electronic time controller (T1)    Second electronic time controller (T2)    Atmosphere connection top valve (V3)    Wastewater outlet valve (V4)