Environmental pollution has been a major problem worldwide. This makes environmental pollution control an important ingredient to a healthy environment. During the last few years, water has become an increasingly important issue in developing nations. Progress in health and education is dependent on access to affordable sanitation and safe water. This chapter as a further study of the authors' previous studies presents a review of articles on designs, models, and applications of electrochemical processes with particular attention to the removal of environmental pollutants (conventional and emerging pollutants). The study revealed that electrical treatment processes can be in the form of electrochemical, electrocoagulation, electrophoresis, electro-flotation, electro-precipitation, electro-adsorption, and electrooxidation. It was concluded that electro-driven technologies can be used in many applications; electrochemical technologies have been proven to be quite useful approaches regarding wastewater treatment, and power sources of electrochemical can be wind and solar photovoltaic.

This chapter presents information on water, arsenic, arsenic in water, and its removal techniques from water and wastewaters. Survey of literature was conducted, and information was collected from published articles in databases (Google Scholar, PubMed, Elsevier, Scopus, Springer, and Magiran) using arsenic removal, wastewater treatment methods for arsenic removal, and pollution control as the keywords. A total of 142 articles were used for the study. The study revealed that techniques of arsenic removal can be divided into non-destructive and destructive methods. It was revealed that electrochemical oxidation, adsorption, and membrane techniques are the most common and effective processes. It was concluded that nanofiltration membranes prepared through single and bilayer polyelectrolyte deposition and electrocoagulation appeared to be the best method, being able to ensure the highest percentage removal (99.9%).