Electronic flocculation device

Electronic flocculation deviceIn recent years, technology has gradually been promoted and become mainstream. With the increasing demand for environmental protection, power plants are paying more and more attention to the treatment of coal containing wastewater. Many power plants have upgraded or renovated their coal containing wastewater treatment systems accordingly.

new-typeElectronic flocculation deviceAdopting a modular design for electrocoagulation, it consists of the reactor body, electrode components, motor, rotating scraper components, and power supply control system.

Its working principle is to apply direct current to multiple parallel plates, generate an electric field between the plates, and allow the water to flow into the gaps between the plates. At this time, the electrified electrode plate will undergo an electrochemical reaction, dissolving Al3+or Fe2+ions and hydrolyzing them in water to undergo flocculation reaction. During this process, other effects such as electric flotation and oxidation-reduction also occur, resulting in effective conversion and removal of soluble, colloidal, and suspended pollutants in water. Including the following functions:

(1) Flocculation effect: Soluble anodes such as iron, aluminum, etc., when subjected to direct current, lose electrons and form metal cations Fe2+and Al3+, which react with OH - in the solution to form metal hydroxide colloidal flocculants. These new ecological hydroxides have high activity and strong adsorption capacity, and combine with colloids, suspended solids, soluble pollutants, bacteria, viruses, etc. in the raw water to form larger flocs, which are removed by precipitation and air flotation. This process is similar to the mechanism of chemical flocculation, including charge neutralization, adsorption bridging, and compression of the double layer.

(2) Air flotation effect: During the electrolysis process, when the voltage reaches the decomposition voltage of water, hydrogen gas and oxygen gas are respectively released on the cathode and anode. The generated gas appears in the form of highly dispersed small bubbles, which adhere to pollutants such as colloids and emulsified oils in the raw water and float to the water surface for removal. The bubbles generated by electrocoagulation are much smaller than those generated by pressurized air flotation, so its air flotation capacity is stronger and the removal effect of pollutants is better.

(3) Oxidation: The oxidation process during electrolysis is divided into direct oxidation and indirect oxidation. Direct oxidation refers to the oxidation of pollutants by losing electrons directly at the anode. Indirect oxidation utilizes anions with lower electrode potentials in the solution, such as OH - and Cl -, to lose electrons at the anode and generate new and stronger oxidants, such as O and Cl2. These active substances are used to cause pollutants to lose electrons and undergo oxidative decomposition, thereby reducing BOD5, CODcr, ammonia nitrogen, and other pollutants in the original solution.

(4) Reduction effect: The reduction effect during electrolysis can be divided into direct reduction and indirect reduction. Direct reduction refers to the reduction of pollutants by obtaining electrons directly on the cathode. Indirect reduction refers to the process in which cations in pollutants first obtain electricity at the cathode, resulting in high or low valence metal cations in the electrolyte being directly reduced to low valence cations or metal precipitates by obtaining electrons at the cathode.