▎ 摘　　要

NOVELTY - Printing and dyeing wastewater (A) is electrochemically treated by utilizing an electrochemical reactor device comprising reactor main body (1), pump (2), power supply (3), titanium electrode (4), graphene thin film electrode (5), and bracket (6). The wastewater (A) is pumped into the reactor main body at a rate of 0.05-0.2 L/minute via reactor inlet (7); contacted with titanium electrode and graphene thin film electrode to carry out electrochemical treatment under a power supply voltage of 1.5-3 V; and then discharged through reactor outlet (8). USE - Method for electrochemical treatment of printing and dyeing wastewater (claimed). ADVANTAGE - The method is simple and environment-friendly. It utilizes electrochemical reactor device which includes graphene thin film electrode to facilitate wastewater adsorption treatment and electrolysis treatment at the same time, thus achieving high total organic carbon removal efficiency, low power supply voltage, and low electrical energy consumption. DETAILED DESCRIPTION - Printing and dyeing wastewater (A) is electrochemically treated by utilizing an electrochemical reactor device comprising reactor main body (1), pump (2), power supply (3), titanium electrode (4), graphene thin film electrode (5), and bracket (6). The reactor main body has hollow structure and is provided with reactor inlet (7) which is arranged between titanium electrode and graphene thin film electrode, and reactor outlet (8) which is arranged between graphene thin film electrode and bottom end of reactor main body. The pump is connected to the reactor inlet. The titanium electrode and graphene thin film electrode are connected to the power supply to serve as cathode and anode, respectively. The titanium electrode consists of titanium metal sheet supported by the bracket set inside the reactor main body. The graphene thin film electrode is disposed within the cross-sectional area of the reactor main body. It is prepared by adding graphene into ultrapure water based on 0.1-0.5 g/L mass-to-volume ratio; ultrasonically dispersing for 5 minutes to obtain graphene hydrogel; vacuum filtering using nylon filter membrane with aperture size of 0.2-0.22 mu m; and drying in a drying box at 35-45 degrees C to obtain graphene thin film electrode. The bracket consists of metal grid support frame which is set on the inner wall of the reactor main body. The wastewater (A) is treated by (a) pumping it into the reactor main body at a rate of 0.05-0.2 L/minute via reactor inlet; (b) contacting with titanium electrode and graphene thin film electrode to carry out electrochemical treatment under a power supply voltage of 1.5-3 V; and (c) discharging the treated wastewater through the reactor outlet. DESCRIPTION OF DRAWING(S) - The drawing is a schematic sectional view illustrating the electrochemical reactor device. Reactor main body (1) Pump (2) Power supply (3) Titanium electrode (4) Graphene thin film electrode (5) Bracket (6) Reactor inlet (7) Reactor outlet (8)