As research progresses, the technology for treating industrial wastewater using iron-carbon microelectrolysis has become increasingly mature. Microelectrolysis technology is gaining prominence in the treatment of recalcitrant industrial wastewater and has found widespread application in engineering practice.
The principle of microelectrolysis is relatively straightforward; it utilizes the corrosion of metals to create electrochemical cells for wastewater treatment. This method uses waste iron scraps as raw materials, requiring no consumption of electrical resources, and thus, it embodies the concept of “treating waste with waste.” Specifically, in the inner electrolytic column of the microelectrolysis process, materials such as waste iron scraps and activated carbon are often used as fillers. Through chemical reactions, strong reducing Fe2+ ions are generated, which can reduce certain components in wastewater that possess oxidative properties.
Additionally, Fe(OH)2 can be used for coagulation in water treatment, and activated carbon has adsorption capabilities, effectively removing organic compounds and microorganisms. Therefore, microelectrolysis involves the generation of a weak electrical current through an iron-carbon electrochemical cell, which stimulates the growth and metabolism of microorganisms. The key advantage of the internal electrolysis water treatment method is that it does not consume energy and can simultaneously remove various pollutants and coloration from wastewater while improving the biodegradability of recalcitrant substances. Microelectrolysis water treatment technology is generally used as a pretreatment or supplementary method in conjunction with other water treatment techniques to enhance the treatability and biodegradability of wastewater. However, it also has disadvantages, with the major drawback being relatively slow reaction rates, reactor blockage, and challenges in treating high-concentration wastewater.
Initially, iron-carbon microelectrolysis technology was applied to the treatment of dyeing and printing wastewater, yielding positive results. Additionally, extensive research and application have been conducted in the treatment of organic-rich wastewater from papermaking, pharmaceuticals, coking, high-salinity organic wastewater, electroplating, petrochemicals, pesticide-containing wastewater, as well as wastewater containing arsenic and cyanide. In the treatment of organic wastewater, microelectrolysis not only removes organic compounds but also reduces COD and enhances biodegradability. It facilitates the removal of oxidative groups in organic compounds through adsorption, coagulation, chelation, and electro-deposition, creating favorable conditions for further treatment.
In practical applications, iron-carbon microelectrolysis has demonstrated significant advantages and promising prospects. However, issues such as clogging and pH regulation limit the further development of this process. Environmental professionals need to conduct further research to create more favorable conditions for the application of iron-carbon microelectrolysis technology in the treatment of large-scale industrial wastewater.
Post time: Sep-07-2023
