Effect of ozonation on biodegradability enhancement and biomethanation potential of pretreatment process wastewaters from 2G ethanol production.

Sivakumar, Sreevathsan and Inchara, Crasta and Bhavana, B. K. and Sandeep, N. Mudliar (2023) Effect of ozonation on biodegradability enhancement and biomethanation potential of pretreatment process wastewaters from 2G ethanol production. Journal of Chemical Technology and Biotechnology, 98. pp. 1425-1434. ISSN 0268-2575

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Abstract

BACKGROUND: The production of second-generation (2G) ethanol from lignocellulosic biomass generates large quantities of high-strength complex wastewaters from various stages of the process. An effective pretreatment is necessary in order to overcome the low biodegradability of these wastewaters for further biomethane recovery. The present study reports the effect of ozonation on the biodegradability enhancement and biomethanation potential of complex 2G ethanol pretreatment process wastewaters, from acid (H2SO4) and alkali (NaOH) pretreatment process. RESULTS: Ozonation(9.33 g m−3)was performedfor both acid and alkali pretreatment wastewaters at aflowrate of 10 L min−1 for 1 h. Ozonation of bothwastewaters increased biodegradability index (BI) up to 36% alongwithminimal chemical oxygen demand (COD; 7 ± 3%), color (10 ± 4%), and toxicity (22.5 ± 7.5%) reduction. Biomethane potential tests were carried out for the control and ozonated wastewaters having BI > 0.4. The acid-pretreatment wastewater indicated poor biomethanation potential due to high presence of sulfates (COD/SO4 ∼ 3.0).However, ozonation of alkali-pretreatment wastewater facilitated up to twofold enhancement in the cumulative methane volume,while theenhancementin the rateofmethane productionwasfoundto beupto 47%.Fourier transform infrared spectroscopic analysis of control and ozonated wastewaters revealed the breakdown of complex organicmolecules and aromatics to readily biodegradable intermediates. The kinetics ofmethane generation could be predicted by the modified Gompertz model. CONCLUSION: The study demonstrated the efficacy of ozonation as an effective pretreatment option to facilitate biodegradability enhancement of 2G ethanol pretreatment process wastewaters. The enhancement in biodegradability was observed to enable subsequent biogas recovery via anaerobic digestion along with COD removal.

Item Type:	Article
Uncontrolled Keywords:	2G ethanol; pretreatment; ozonation; biodegradability; biomethane potential; kinetics
Subjects:	500 Natural Sciences and Mathematics > 04 Chemistry and Allied Sciences > 15 Cellulose Chemistry 600 Technology > 08 Food technology > 16 Nutritive value > 07 Waste utilization
Divisions:	Food Engineering Plant Cell Biotechnology
Depositing User:	Food Sci. & Technol. Information Services
Date Deposited:	08 Dec 2023 06:05
Last Modified:	08 Dec 2023 06:05
URI:	http://ir.cftri.res.in/id/eprint/16817

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