Removal of Chemical Oxygen Demand and Color from Simulated Textile Wastewater Using a Combination of Chemical/Physicochemical Processes

Abstract

 Large quantities of dyes used in the textile industry are lost to the effluents and flows into surface water during the manufacturing and processing operations. Many methods have been used such as biological, physical and chemical treatment of dye containing wastewater. Among these treatment technique, activated sludge, flocculation, and adsorption are the most commonly applied methods in Indonesia. Dyes are usually resistant to aerobic degradation, for example decolorization of azo dyes has been found to be less effective solely using this treatment. On the other hand, flocculation and adsorption methods are not destructive, mainly just concentrate and separate the pollutants phases. This research paper investigates the removal of color and chemical oxygen demand/COD from textile wastewater using advanced oxydation process either by ozone-UV and zinc oxide photocatalyst. Effects of various variables on decolorization and COD removal process have been investigated. The results showed that ozone/UV could achived a complete decolorization (100% removal) when 40 mg/l dye initial concentration was treated with 170.43 ppm/min ozonation for 120 min of incubation period. The same color removal efficiency also achieved when 20 mg/l dye initial concentration treated in the photocatalytic reactor contained 0.71 mg/cm 2 of ZnO nanoparticle after 135 min of incubation period. COD removal efficiency for ozone/UV and ZnO photocatalytic treatment was 60% and 77%, respectively.

A New Synergetic Nanocomposite for Dye Degradation in Dark and Light

“…Organic dyes, which are extensively used in industries such as textile, leather, paint, printing inks, plastics, food, drugs and cosmetics, are released into water bodies, resulting in high Chemical Oxygen Demand (COD) even after being treated1. Among these, textile industries release the highest amount of non-biodegradable dye effluents into the environment.…”

Survey of treatment process in water treatment plant and the characteristics of flocs formed by two new coagulants

“…It uses strong chemical agent to degrade both the organic as well as inorganic matter present in the water samples. The organic matter such as humic acid was also included [27,28], and these results also indicated that the organic matter in raw water had significant effects on residual Al.…”

PdCu Nanoparticles Stabilized on Porous CeO2 for Catalytic Degradation of Azo Dyes: Structural Characterization and Kinetic Studies

“…[1][2][3] Residual dye content from effluents of the textile dyeing and finishing industry results in major environmental concerns in current days which are associated with the intensity of color and organic properties such as chemical oxygen demand (COD). [4][5] Most dyestuffs are highly resistant to microorganisms and recalcitrant to conventional biological wastewater treatment processes having aromatic structures. [6][7] Unfortunately, conventional wastewater treatment of textile industries that couples chemical coagulation with activated sludge processes cannot satisfy the more restrictive criteria for color.…”