Device and method for controlling concentration of residual aluminum in process of high pH raw water treatment

The invention belongs to the technical field of water treatment, and provides a device and a method for controlling the concentration of residual aluminum in the process of high pH raw water treatment. The device comprises a liquid storage tank, a pressure reducing valve, a gas flowmeter, a linear motion electric control valve, a water jet, a pH on-line monitoring instrument, a central processing unit, a memory, a signal input/output port and a display, wherein the liquid storage tank is used for storing pure carbon dioxide, the pressure reducing valve is used for restoring the pressure of carbon dioxide gas in the liquid storage tank to a normal pressure, the gas flowmeter is used for monitoring the flow rate of the carbon dioxide gas, the linear motion electric control valve is used for regulating the flow rate of the fed carbon dioxide gas, and the carbon dioxide is fed by the water jet; the pH on-line monitoring instrument is used for carrying out continuous monitoring on the pH value of water; and the central processing unit is connected with the memory, the signal input/output port, the display, the pH on-line monitoring instrument and the linear motion electric control valve. According to the invention, no coagulant is required to be prepared; and the device and method disclosed by the invention have the advantages that the process is simple, the production cycle is short, the cost is low, the product is more pure, and the concentration of residual aluminum is reduced in high pH raw water environments.