Abstract
The research seeks to investigate the effect of catalyst (1-wt % Platinum on activated carbon) on the wet oxidation process of treating paper mill effluent. The study also assesses the effect of temperature, oxygen partial pressure and initial Chemical Oxygen Demand (COD) concentration of debarking wastewater on the contaminants during the catalytic wet oxidation process. Catalytic wet oxidation process was studied at 120-180°C temperature, 0-10 bar oxygen partial pressure, 0-1 g/L catalyst concentration and 1000-3000 mg/L initial COD concentrations. Responses such as COD, Total Organic Carbon (TOC), Color, Lignin/Tannin, Biochemical Oxygen Demand (BOD) and pH were measured and analyzed. In the study, it was realized that changes in temperature, oxygen partial pressure, catalyst concentration and initial COD influenced the oxidation process with the best combination occurring at a temperature of 180°C, 10 bar oxygen partial pressure, 1 g/L catalyst concentration and 3000 mg/L initial COD concentration. At these conditions; 74% of COD, 97% of lignin/tannin, 54% of TOC and 90% of color were removed from the wastewater.
Highlights
IntroductionThe water becomes contaminated as it removes toxic and hazardous organic chemicals from the wood material which may eventually be released into freshwater ecosystems
Pulp and paper industries use tons of water during wood processing and paper making
Catalytic wet oxidation process was studied at 120-180°C temperature, 0-10 bar oxygen partial pressure, 0-1 g/L catalyst concentration and 1000-3000 mg/L initial Chemical Oxygen Demand (COD) concentrations
Summary
The water becomes contaminated as it removes toxic and hazardous organic chemicals from the wood material which may eventually be released into freshwater ecosystems. Their toxic nature is derived from the presence of several naturally occurring and xenobiotic compounds which are formed and released during various stages of papermaking [1,4]. Many wastewater treatment methods are already developed and are in use Most of these conventional methods are incapable of effectively removing all organic pollutants. Wastewaters produced by paper mills contain organics that are non-biodegradable or toxic and are found in high concentrations making biological treatment not very effective
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