A novel bio-coagulation/co-digestion/pyrolysis scheme for banana pseudostem waste management: techno‑economic and sustainability approaches.

Autor: Dadebo D; Environmental Engineering Department, Egypt-Japan University of Science and Technology (E-JUST), Alexandria, 21934, Egypt. derrick.dadebo@ejust.edu.eg., Atukunda A; Environmental Engineering Department, Egypt-Japan University of Science and Technology (E-JUST), Alexandria, 21934, Egypt., Ibrahim MG; Environmental Engineering Department, Egypt-Japan University of Science and Technology (E-JUST), Alexandria, 21934, Egypt.; Environmental Health Department, High Institute of Public Health, Alexandria University, Alexandria, 21544, Egypt., Nasr M; Environmental Engineering Department, Egypt-Japan University of Science and Technology (E-JUST), Alexandria, 21934, Egypt.; Sanitary Engineering Department, Faculty of Engineering, Alexandria University, Alexandria, 21544, Egypt.
Jazyk: angličtina
Zdroj: Environmental science and pollution research international [Environ Sci Pollut Res Int] 2024 Oct; Vol. 31 (48), pp. 58430-58444. Date of Electronic Publication: 2024 Sep 24.
DOI: 10.1007/s11356-024-34917-z
Abstrakt: While several studies have focused on utilizing banana pseudostem waste (BPW) for wastewater treatment via bio-coagulation, this process still suffers from secondary pollution caused by the disposal of generated sludge. To avoid this pollution transfer issue, this study is the first to focus on the recyclability of post-coagulation sludge (PCS) to recover added-value products. For this purpose, BPW was used as a model bio-coagulant for the decontamination of laundry wastewater (LWW), followed by anaerobic digestion and pyrolysis schemes to recover biogas and biochar, respectively. In the first experiment, BPW succeeded in removing 55.44 ± 1.21%, 90.40 ± 3.09%, and 78.13 ± 2.44% of chemical oxygen demand (COD), turbidity, and surfactant, respectively, at the optimized condition (pH = 3.5, dosage = 2.34 g/L, stirring speed = 160.6 rpm, and settling time = 55.5 min). Inoculating the spent bio-coagulant with cattle manure (CM), with a mixing ratio of 1:1 (w:w), showed a biogas yield of 110.33 ± 6.02 mL/g COD. The synergetic effect of spent coagulant and microbes of CM was further validated by performing a COD mass balance, showing that about 31.52 ± 1.63% of COD feed was converted to bio-CH 4 (as COD). Further, the thermal treatment of digestate was successfully employed for biochar recovery at a yield of 0.58 ± 0.05 g biochar/g dry digestate. The study also revealed that the triple LWW treatment/biogas/biochar strategy could gain economic benefits with a payback period of 4.4 years. Hence, BPW could be used as a promising feedstock for pollution reduction, energy generation, and gaining profits.
(© 2024. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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