Environment -friendly processes: Electrocoagulation and Activated carbon filtration for reuse of textile wastewater

Abstract

Electrocoagulation is a simple method used for removing contaminants and recycling wastewater by using aluminum, stainless steel and iron electrodes. Textile wastewater was collected from the textile processing industry. This promising treatment consists of two steps, electrocoagulation as a first step completed with Activated carbon filtration as a second step reported in this work. The contaminants of the solution combined in the situ forming metal hydroxide flocs, which filtered as a precipitate or skimmed as a float. To revenue the best advantage of this system, the two processes should run in a rational sequence. Several important parameters, such as applied potential, Electrode material and conductivity were studied to achieve higher removal efficiency. Scanning electron microscope (SEM) analysis, Atomic force microscopy (AFM) and the electrical connection of electrodes were investigated. The results showed clearly that the stainless steel electrode can enhance effectively color removal by 98.8 %, reduced COD to 256 mg /L, while Activated carbon filtration can almost remove the total dissolved solids (TDS) and, turbidity. The findings showed that in textile wastewater at pH=10.5 the stainless steel is superior to iron and aluminum as a sacrificial electrode material and Mono-polar Connection in Parallel is the best connection as it decreases the potential difference, and energy Consumption was 2.5 kWh/m3.

An Electrocoagulation Process Operated at Batch Recirculation Mode for Treatment of Refinery Wastewaters: Optimization via Response Surface Methodology

“…Coagulation can also be done in situ by electrolytic oxidation of a suitable anode material, a process known as electrocoagulation [16]. In recent years, the use of electrocoagulation(EC) in the treatment and purification of industrial wastewater has garnered significant interest [17,18]. Electrocoagulation is seen as a potential alternative to chemical coagulation for the treatment of wastewater that is highly polluted.…”