Advanced Treatment of Paper Mill Wastewater Using Electro-Fenton Process with Novel Catalytic Particle Electrodes

Abstract

Waste rice straw and iron-containing sludge were converted into catalytic particle electrodes (CPEs). The CPEs were tested for their ability to strengthen electro-Fenton (EF) oxidation of real paper mill wastewater. The prepared CPEs were characterized by different techniques including scanning electron microscopy, X-ray diffraction, BET surface area, and Xray fluorescence. The CPEs exhibited excellent electro-catalytic activity and appreciably reduced the levels of pollutant parameters during EF process at near neutral pH conditions. Additionally, the treated wastewater was more biodegradable and had lower toxicity, which met Chinese effluent discharge criteria. Optimized treatment conditions used were a current density of 10 mA/cm 2 , a CPEs dosage of 1.0 g/L, and an aeration rate of 5 L/min. Based on the measurements of H2O2 and hydroxyl radicals ( • OH), the enhancement of catalytic activity was attributed to more in situ • OH being produced from the H2O2 which was generated from dissolved oxygen (DO). Moreover, the CPEs showed superior stability, and successive recycle runs were completed with efficient and economical application advantages.

A Review Paper on Heterogeneous Fenton Catalyst: Types of Preparation, Modification Techniques, Factors Affecting the Synthesis, Characterization, and Application in the Wastewater Treatment

“…Many researchers are working on the treatment of wastewater generated from different industries like printing, dye [1], plastic, paint [2], textile [3], food, leather [4], petroleum [5], paper [6], cosmetics [7], distilleries [8], steel, rice mill, fractory nature [28][29][30]. For the treatment of generated wastewater, various conventional and non-conventional methods like coagulation method [31], biological method [32], ion exchange method have been used, but among these methods, advanced oxidation technology (AOTs) is very effective comparatively [16,33].…”