| Textile wastewater is one of the most polluted wastewaters due to their strongcolor, large amount of suspended solids, broadly fluctuating pH, high chemicaloxygen demand and biotoxicity and causes coloring of the receiving waterenvironment. The colored and toxic wastewater released into the ecosystemundergoes chemical as well as biological changes, and consume dissolved oxygenfrom the stream, it is a dramatic source of esthetic pollution and perturbation in theaquatic life. In recent years, investigations have been focused on the treatment oftextile wastewaters using electrocoagulation by being a simple and efficient method.With this technology, metal cations are produced on the electrodes via electrolysisand these cations form various hydroxides in the water depending on the water pH. Inaddition to this main reaction, several side reactions, such as hydrogen bubbleformation and the reduction of metals on cathodes, also take place in the cell.The removal of Acid Black1(AB1) and Basic Red2(BR2) from aqueoussolutions via an electrocoagulation (EC)/moringa oleifera seeds (MOS) adsorptioncoupling process by using aluminum and stainless steel electrode in a batch reactor isdescribed in this study. The influences of operational parameters such as currentdensity, MOS dosage, and dye initial concentration on color removal efficiency werestudied, and the unit energy demand (UED), the unit electrode material demand(UEMD), the charge loading (Qe) and the energy consumption (Econ) were calculatedand discussed. The amounts of adsorbent and energy consumption were considered asmain criteria of process evaluation, and optimum conditions were chosen. Theaddition of an appropriate MOS dosage (0.6g/L for AB1and5.0g/L for BR2)resulted in faster decolorization of dyes especially at lower current densities and wassimultaneously accompanied by a significant reduction in contact time compared tothe conventional simple EC process. The coupling process achieved efficiencyremovals above99.30%and94.00%for AB1and BR2, respectively. The EC/MOS coupling technique could be recommended to replace the conventionalsimple EC because of its high removal efficiency, short contact time, and low energyconsumption. |
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