Integrated electrochemical processes for textile industry wastewater treatment: system performances and sludge settling characteristics

Abstract

Textile wastewater containing toxic dyes needs efficient treatment before being released into the environment. Certain dyes are known or presumed to have carcinogenic potential for humans. In this work, hybrid electrochemical processes including electrocoagulation (EC) alone and combined with electro Fenton (EF), anodic oxidation (AO) and peroxicoagulation (PC) were tested to treat real textile wastewater using a batch reactor. A sequential EC and EF (EC-EF) process was found to be more effective. The experimental results indicated that the effectiveness of the treatment decreases in the following order: EC-EF > EC-AO > EC-PC > EC. EC-EF results showed a decrease in chemical oxygen demand (COD, 97%), total organic carbon (98%), total suspended solids (98%), and the concentration of metal species; showing that the treatment of such wastewater type can be achieved by combined EC-EF process in a one-pot bench-scale reactor. The electrical energy consumption, the iron dissolution, and the biological oxygen demand/COD ratios of EC and EC-EF processes were evaluated. Characterization of the sludge generated during EC treatment at current density of 20 mA cm − 2 was carried out. Precipitation, adsorption, and electrochemical oxidation/reduction of organic dyes and metallic ions occurred during the treatment. This investigation shows the efficiency of combined EC-EF to treat textile wastewater.

Adsorptive Removal of Cd(II) Ions from Wastewater Using Maleic Anhydride Nanocellulose

“…e stems of the collected Eichhornia crassipes weed sample were cut in the length of 8 mm, washed with distilled water several times to remove any dust particles, dried with the sun for 4 days, and ground using a grinder carefully to form coarse particles [35][36][37][38]. e coarse particles were treated with 100 mL of 2.5 M NaOH solution at 50°C for 3 hours to remove the lignin and hemicelluloses present in lignocellulosic biomass.…”

“…e thermodynamic study of the adsorption process was studied by considering the fundamental thermodynamic parameters such as a change in Gibbs free energy (∆G), change in enthalpy (∆H), and change in entropy (∆S) values [34,35]. erefore, the thermodynamics of the removal of Cd(II) ions was performed by using all the optimum values of predetermined parameters, such as solution pH, sorbent dosage, Cd(II) ions initial concentration, and agitation speed by varying the temperature range from 20 to 45°C.…”

Comparative Efficacy of Coagulation-Flocculation and Advanced Oxidation Process (AOP: Fenton) for Textile Wastewater Treatment

“…Total Organic Carbon (TOC) is an important parameter of industrial effluent, the presence of which indicates unhealthy condition for water [40]. The TOC removal efficiency in coagulationflocculation treatment was noticed noteworthy as97.81%, 88.82%, 92.34% and 86.56% at dose-1, dose-2, dose-3 and dose-4 respectively.…”

Structure, Morphological, and Physicochemical Characteristics of a New Composite Coagulant Made From Polyaluminium Chloride and Agro-waste of Tapioca Peel

“…Characterisation test is required since the prepared composite coagulant (PACTPPg) is considered distinctive and new. The tests are also important in order to gain information related to the nding of the best weight/weight ratio of TPP/Al = 3.71 during the preliminary stage of study [51]. The characterisation tests were conducted after 24 hours of the ageing process.…”