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Issue
Korean Journal of Chemical Engineering,
Vol.39, No.7, 1821-1830, 2022
Ultrasonication coupled electrochemical treatment of sugar industry wastewater: Optimization, and economic evaluation
Patel RK, Shankar R, Khare P, Mondal P
This study demonstrates the optimization of treatment option, an integrated advanced-oxidation process (AOP) based approach where integration of two processes, ultrasonication (US) and electrocoagulation (EC), were applied for sugar industry wastewater (SIW) treatment. Experimental results confirm that the individual US and EC processes for SIW treatment are found to be inefficient, as only 16% COD removal (equivalent to COD removal: 268mg/L) is achieved with US process in 20min, while 68% COD removal (equivalent to COD removal: 1,142mg/L) is achieved in 60 min operation time with EC process. Encouraging results were obtained after integration of US (10.6% COD removal in 20min equivalent to COD removal from 1,680mg/L to 1,502mg/L) with EC (82% COD removal in 30 min equivalent to COD removal from 1,502mg/L to 270mg/L) process, which is collectively classified as ultrasonication-electrochemical (US+EC) process. Overall integration of US and EC process ultimately increased the COD removal up to ~84% (equivalent to COD removal from 1,680mg/L to 270mg/L) in comparatively shorter operating time (US+EC=30min). Calorific value of sludge and scum obtained after EC treatment was determined as 3.69 and 2.87MJ/kg, respectively. Treatment cost of sono-electrochemical is estimated based on 1 kg COD removal or 1m3 wastewater as 1.40 or 1.974 $, respectively, which is found on lower ends when compared with the many other available treatment technologies.
Keywords: Cost Analysis; COD Removal; Industrial Wastewater Treatment; Electrocoagulation; Sono-electrochemical; Sugar Industries Wastewater; Ultrasonication
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