A three-dimensional electric-biology-coupled water purification system and a water purification method

A three-dimensional electric-biology-coupled water purification system and a water purification method are disclosed. A three-dimensional particle electrode layer of the water purification system is disposed above an adsorption-type biological filtering material layer. The three-dimensional particle electrode layer and the adsorption-type biological filtering material layer are connected through a plastic perforated plate. The periphery of the three-dimensional particle electrode layer is connected to a main electrode anode, the middle of the three-dimensional particle electrode layer is connected to a main electrode cathode, and the part between the main electrodes is filled with catalytic particle electrodes. The bottom of the adsorption-type biological filtering material layer and a gas-dissolving water distributing chamber are connected through a plastic perforated plate manner. The water distributing chamber is connected to an aeration device and a refluxing device. The water purification method includes steps of: (1) mixing raw water with gas and refluxing water in the gas-dissolving water distributing chamber; (2) physically filtering and intercepting; (3) performing aerobic biological treatment; (4) performing three-dimensional particle electrode oxidation; and (5) discharging purified water. By interaction of the physical filtering, the aerobic treatment, and the three-dimensional particle electrode oxidation, predetermined treating effects can be achieved and stable water quality of the discharged water.