Electrochemical Methods for Liquid Waste Treatment

Efficient treatment of liquid waste is vital for protecting water resources and promoting environmental sustainability. This chapter explores how electrochemical approaches provide a new alternative to traditional waste liquid treatment by offering high performance, operational versatility, and reduced reliance on added chemicals. Significant advances in electrode material development, reactor design optimization, and the integration of electrochemical systems have broadened the spectrum of treatable contaminants and enhanced overall process efficiency. The chapter reviews the main electrochemical techniques: electrocoagulation (EC), electro-oxidation (EO), electroflotation, and electrodialysis. It examines their applications across sectors from municipal water supply to industrial effluent management, with particular attention to removing persistent pollutants such as organic compounds and heavy metals. The discussion then turns to the challenges of scaling up these technologies, including energy consumption, electrode durability, and economic feasibility, and proposes strategies to address each issue. An analysis of environmental and economic impacts demonstrates that electrochemical treatment can reduce sludge generation and enable resource recovery. In conclusion, this chapter underscores the potential of electrochemical technologies to deliver sustainable and efficient solutions for liquid waste management.