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1. A biofilm electrochemical reactor for simultaneously removing nitrate nitrogen and trace organic matters in water, wherein a main structure comprises a reactor, an upper electrode including a first anode and a second anode, activated carbon fillers, a lower electrode including a first cathode and a second cathode, stainless steel electrode rods, a filler adding hole, an automatic exhaust valve, a power supply, voltage regulators, a water distributor, a return valve, a water inlet pipe, a water outlet pipe, a return pipe and a water outlet valve; an outer shell of the reactor is made of glass fiber reinforced plastic, the reactor is internally divided into three functional regions consisting of a first functional region, a second functional region and a third functional region, wherein the first functional region and the third functional region are two independent biofilm electrochemical reaction regions, a lower part and an upper part of the first functional region are correspondingly provided with the first anode and the first cathode which are both of flat plate structures, and a lower part and an upper part of the third functional region are correspondingly provided with the second cathode and the second anode which are both of flat plate structures; the first cathode and the second cathode are connected in parallel and are connected with a negative electrode of the power supply through wires; the first anode and the second anode are connected in parallel and are connected with a positive electrode of the power supply through wires, and the voltage regulators are arranged between the first anode and the power supply and between the second anode and the power supply, and are respectively used for regulating voltages of the first functional region and the third functional region; the second functional region is a three-dimensional biofilm cathode, the stainless steel electrode rods with a diameter of 5 mm are vertically and uniformly arranged on a surface of the first cathode so as to increase a contact area with the activated carbon filler and increase a space efficiency of the first cathode, by inoculating autotrophic denitrifying bacteria in the second functional region, and utilizing hydrogen production of the three-dimensional biofilm cathode and an inorganic carbon source generated by the first anode of the first functional region, the autotrophic denitrifying bacteria denitrifies; the activated carbon fillers are filled in the three functional regions, the activated carbon fillers are filled through filler adding holes arranged on a right side of each functional region, the activated carbon fillers are in contact with the lower electrode, and the distance between the activated carbon fillers and the upper electrode is 2-5 cm; the automatic exhaust valve is vertically arranged on the water outlet pipe at the top of the reactor and used for removing residual gas generated in the reactor, and the water outlet valve is arranged at an end part of the water outlet pipe; and the water outlet pipe is communicated with the return pipe, part of outlet water is returned to the bottom of the reactor by the return pipe, the return pipe is communicated with the water inlet pipe at the bottom of the reactor, the return pipe is provided with the return valve for controlling close to the water inlet pipe, and the bottom of the reactor is provided with the water distributor connected with the water inlet pipe.
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