Research on pesticide wastewater treatment technology using iron-carbon filler

The iron-carbon microelectrolysis of pesticides using iron-carbon filler is based on the electrochemical reaction of corrosion. In this reaction, iron has a lower electrode potential than carbon. When the two are placed in direct contact in a conductive electrolyte solution, iron acts as the anode, while carbon materials such as coke, activated carbon, graphite, and coal blocks act as the cathode, forming a macroscopic galvanic cell. At the same time, iron chips themselves contain some small particles of impurities such as iron carbide. Iron carbide has a lower corrosion tendency than iron. Therefore, when the iron-carbon filler is immersed in the solution, it will also form countless tiny microscopic galvanic cells.

The treatment of industrial wastewater using micro-electrolysis is based on the galvanic cell reaction in electrochemistry. When the metal anode is directly in contact with the cathode material and immersed in an electrolyte solution (acidic wastewater), a galvanic cell reaction occurs, forming a corrosion cell, which leads to the so-called corrosion reaction, where the metal anode is corroded and consumed. Corrosion cells can be further divided into micro-corrosion cells and macro-corrosion cells. Micro-corrosion cells refer to cells formed on the metal surface due to the presence of many tiny electrodes; macro-corrosion cells refer to "large cells" composed of electrodes visible to the naked eye. Catalytic alloy iron-carbon packing is an alloy of iron and carbon, consisting of refined iron powder, graphite carbon powder, and some catalytic components such as carbon, silicon, manganese, etc. Iron-carbon packing is a porous substance with high surface activity.

Graphite carbon powder and catalytic components are dispersed in the form of extremely small particles within the iron-carbon filler. Due to their lower electrode potential than iron, when immersed in acidic wastewater, thousands of tiny micro-batteries are formed, and current flows on their surfaces in countless tiny electric fields. Iron is corroded and consumed as the anode, while graphite carbon powder and catalytic components become the cathode and undergo electrode reactions. When there are macro-cathode materials such as inert carbon (such as graphite, coke, activated carbon, coal, etc.) present in the system, it can also form the basis for research on macro-battery treatment technology