Micro-electrolysis technology is an ideal process for treating high concentration organic wastewater, also known as internal electrolysis. Under different conditions, the potential difference of1.2v generated by micro-electrolytic materials filled in wastewater is used to decompose wastewater, so as to achieve the purpose of degrading organic pollutants. When the system pumps water, countless micro-battery systems will be formed in the equipment, forming an electric field in the action space.

The working principle of micro-electrolysis is based on the interaction of electrochemistry, redox, physical adsorption and flocculation and precipitation to treat wastewater. The method has the advantages of wide application range, good treatment effect, low cost, convenient operation and maintenance, and no need to consume power resources. This process can greatly reduce cod and chromaticity, improve the biodegradability of wastewater, and has a good effect on the removal of ammonia nitrogen. The micro-electrolysis materials used in traditional micro-electrolysis process are generally iron filings and charcoal, which need to be activated by acid and alkali before use, and are easy to be passivated and hardened during use. At the same time, because iron and carbon are in physical contact, it is easy to form an isolation layer between them, which makes micro-electrolysis unable to continue and lose its function, resulting in frequent replacement of electrolytic materials, which not only has a large workload and high cost, but also affects the effect and efficiency of wastewater treatment.

Second, the principle of iron-carbon micro-electrolysis and the reaction principle of iron-carbon filler (that is, the principle of treating refractory industrial organic wastewater with iron-carbon filler):

(1) electron flow: Using the potential difference between iron and carbon, there is a natural potential difference of 1.4V between iron and carbon. When the iron-carbon filler is soaked in the wastewater solution, the wastewater solution is used as a conductive solution, and the price of the waste micro-electrolytic filler is much higher than that of the pollutants in the water as an electrolyte. Under the action of weak electric field formed by natural potential difference between iron and carbon, iron will release electrons, which will move from anode to cathode under the action of electric field. In the process of movement, electrons will have the probability of passing through pollutants, especially long-chain substances or substances containing benzene rings. Long-chain substances or carbon chains containing benzene rings are interconnected by paired electrons. When a single electron is inserted in the solution, the single electron will be attracted by the paired electrons in the carbon chain, so that the price of micro-electrolytic filler will form a 3-electron structure, which is a very unstable structure. After a certain time, the 3-electron structure will automatically explode, and the long-chain substance will be divided into two parts. When electrons are constantly interspersed, the carbon chain will split again after exercise, so that the carbon chain will become shorter and shorter. In this way, refractory substances will be transformed into degradable substances. At the same time, COD can be reduced.

(2) Reducibility: When the iron-carbon filler is immersed in the wastewater solution, the iron as the anode will lose electrons and become iron ions. The newly generated iron ions have very strong reducibility and can reduce the refractory substances in the wastewater.

(3) Oxidation: When electrons are inserted into wastewater, they will also pass through water molecules. When water molecules decompose, a large number of hydrogen radicals, oxygen radicals and hydroxyl radicals will be produced. These new ecological free radicals are very oxidizing and can completely oxidize the organic matter in wastewater into carbon dioxide and water. Thereby completely reducing COD.

(4) Electrophoresis: When electrons move in the wastewater, the micro-electrolysis filler will be used to adsorb positively charged pollution particles, and the pollutants adsorbed on the electrons will be neutralized after moving to the cathode, and then will sink to the bottom to be removed.

(5) Flocculation: Iron ions will be formed after losing electrons, and ferrous hydroxide will be formed after adding new ecological iron ions into alkali liquor. Ferrous hydroxide is a good flocculant, which can adsorb a large number of organic substances in wastewater for flocculation and precipitation.