Removal of nitrate ions in wastewater using an electrochemical method

초록

The nitrate ion (NO3-) in wastewater may cause serious environmental problems. In particular, increased nutrient levels in coastal waters resulting from nitrogen wastewater create a red tide for the rapid growth of algae. This kind of chemical pollution can alter the balance of marine ecosystems. However, nitrates in wastewater are difficult to remove. Many researchers have tried to remove nitrogen in wastewater by using biological, chemical, and physical treatments. Development of a clean electrochemical process to eliminate nitrates dissolved in wastewater is an important challenge for environmental purposes. In this study, a promising and effective electrochemical reduction method was investigated with various metals such as Zn, Ni, Cu, and stainless steel for the removal of the nitrate ions. The effect of pH, applying current, time, and concentration of nitrate ions were studied. The conversion of nitrate ions was measured by voltammetry methods and a quantitative analyzer. Zinc metals studied, exhibited the highest electro-catalytic activity. In addition, the higher pH of the wastewater showed better removal of nitrogen as nitrate. Nitrates were believed to be reduced to nitrogen gas by electro-catalytic reactions.