Abstract
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: 268 mg/L) is achieved with US process in 20 min, while 68% COD removal (equivalent to COD removal: 1,142 mg/L) is achieved in 60 min operation time with EC process. Encouraging results were obtained after integration of US (10.6% COD removal in 20 min equivalent to COD removal from 1,680 mg/L to 1,502 mg/L) with EC (82% COD removal in 30 min equivalent to COD removal from 1,502 mg/L to 270 mg/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 1,680 mg/L to 270 mg/L) in comparatively shorter operating time (US+EC=30 min). Calorific value of sludge and scum obtained after EC treatment was determined as 3.69 and 2.87 MJ/kg, respectively. Treatment cost of sono-electrochemical is estimated based on 1 kg COD removal or 1 m3 wastewater as 1.40 or 1.974$, respectively, which is found on lower ends when compared with the many other available treatment technologies.
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Patel, R.K., Shankar, R., Khare, P. et al. Ultrasonication coupled electrochemical treatment of sugar industry wastewater: Optimization, and economic evaluation. Korean J. Chem. Eng. 39, 1821–1830 (2022). https://doi.org/10.1007/s11814-021-1046-3
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DOI: https://doi.org/10.1007/s11814-021-1046-3