The principle of electrolysis method for treating industrial wastewater: Titanium anode electrolysis method is used to treat wastewater, which can be divided into electrochemical oxidation, electrochemical reduction, electric flotation, electrocoagulation, and other methods based on the removal object and the generated electrochemical effect.
The electrolytic cell is equipped with an electrode plate. Take appropriate spacing between the electrode plates to ensure less power consumption and easy installation, operation, and maintenance. The electrolytic cell is divided into two types according to the way of the electrode plate connected to the power supply: unipolar and bipolar. After being electrified, under the action of an external electric field, the anode loses electrons and undergoes an oxidation reaction, while the cathode obtains electrons and undergoes a reduction reaction. Electrolytic water treatment technology is divided into direct electrolysis and indirect electrolysis:
Direct electrolysis: The wastewater flows through the electrolysis tank and serves as an electrolyte, where oxidation and reduction reactions occur at the anode and cathode respectively, removing harmful substances. This direct oxidation or reduction reaction on the electrode is called direct electrolysis.
Indirect electrolysis: Electrolytic treatment of wastewater can also adopt indirect oxidation and indirect reduction methods, which use electrode oxidation and reduction products to chemically react with harmful substances in the wastewater, generating insoluble precipitates to separate and remove harmful substances. It has a good removal effect on COD, ammonia nitrogen, and chromaticity in degraded water.
The types of industrial wastewater treated by electrolysis include electroplating wastewater, coking wastewater, organic wastewater, ammonia nitrogen wastewater, printing and dyeing wastewater, garbage leachate, fecal wastewater, oily wastewater, cyanide wastewater, oilfield reinjection water, recycled metal wastewater, hospital wastewater, and catering wastewater treatment
1. Electron transfer is only carried out between electrolysis and waste water components, and no additional redox agent is required to avoid secondary pollution caused by additional agents.
2. The reaction conditions can be adjusted at any time by changing the applied current and voltage, with strong Controllability.
3. Free radicals that may be generated during the process react indiscriminately with organic pollutants in wastewater, degrading them into carbon dioxide, water, and simple organic matter, with little or no secondary pollution generated.
4. The reaction conditions are mild, and the electrochemical process can be carried out under normal temperature and pressure.
5. Reactor equipment and its operation are generally relatively simple, and if designed reasonably, the cost is not expensive.
6. If the scale of pollution discharge is small, on-site treatment can be achieved.
7. When metal ions are present in wastewater, the cathode anode can act simultaneously (cathodic reduction of metal ions, anodic oxidation of organic matter) to maximize treatment efficiency and recycle valuable chemicals or metals.
8. It can be treated separately or combined with other treatments, such as pre-treatment, to improve the biodegradability of wastewater.
9. It has the functions of air flotation, flocculation, and disinfection.