Abstract
The unconscious use of surface and ground waters and the rapid pollution of water, which is the main source of life for all living creatures as a result of drought due to global warming, pose a serious problem. The rapidly increasing world population and the need for clean water have brought up a global water crisis. The textile industry is one of the largest producers of wastewater in the world. Textile industry wastewater contains high amounts of non-biodegradable organic compounds, high concentrations of dyestuffs, salt, detergent and soap. Therefore, it is of great importance to remove organic pollutants in this wastewater. Since traditional methods are insufficient to remove organic compounds in wastewater, advanced treatment methods are required. Advanced oxidation processes (AOPs) are one of the alternative treatment methods preferred in recent years. In this study, color removal from textile industry wastewater was researched by the heterogeneous Fenton process, which is an advanced oxidation process. The parameters such as catalyst dosage, pH, hydrogen peroxide concentration, temperature, reaction time and mixing speed that effect heterogeneous Fenton processes were investigated. Under optimum experimental conditions, the color removal efficiency was achieved as 87%.
Highlights
The textile industry is one of the industries with high water consumption in the world and the amount of wastewater generated after production is quite high
Iron ions act as catalysts and hydroxyl radicals (·OH) are produced from the reaction of iron ions with hydrogen peroxide (H2O2) in an acidic condition
Hydrogen peroxide (H2O2) (30% w/w) used in heterogeneous Fenton processes was provided from Sigma Aldrich
Summary
The textile industry is one of the industries with high water consumption in the world and the amount of wastewater generated after production is quite high. The dyestuffs in the water change the pH value of the water even at very low concentrations and increase the chemical oxygen demand. Discharging these wastewaters into the receiving environment without treatment has a detrimental effect on the health of live and causes serious environmental problems (Soltani et al, 2013; Verma et al, 2012). In recent years, advanced oxidation processes (AOPs) using ozone, titanium dioxide (TiO2), ultraviolet (UV) light, and Fenton’s reagent (H2O2 and ferrous ion) are widely used because they transform toxic and nonbiodegradable organic pollutants into harmless end products. The oxidation reactions generally follow as below Eq (1)-(4) (Sani et al, 2020)
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