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Sugarcane Bagasse as a Co-Substrate with Oil-Refinery Biological Sludge for Biogas Production Using Batch Mesophilic Anaerobic Co-Digestion Technology: Effect of Carbon/Nitrogen Ratio

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Department of Civil and Environmental Engineering, Universiti Teknologi PETRONAS, Seri Iskandar 32610, Perak Darul Ridzuan, Malaysia
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Institute of Energy Infrastructure (IEI), Universiti Tenaga Nasional (UNITEN), Kajang 43000, Selangor Darul Ehsan, Malaysia
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Department of Chemical Engineering, Universiti Teknologi PETRONAS, Seri Iskandar 32610, Perak Darul Ridzuan, Malaysia
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Authors to whom correspondence should be addressed.
Water 2021, 13(5), 590; https://doi.org/10.3390/w13050590
Received: 7 December 2020 / Revised: 15 January 2021 / Accepted: 16 January 2021 / Published: 25 February 2021
(This article belongs to the Section Wastewater Treatment and Reuse)
Man-made organic waste leads to the rapid proliferation of pollution around the globe. Effective bio-waste management can help to reduce the adverse effects of organic waste while contributing to the circular economy at the same time. The toxic oily-biological sludge generated from oil refineries’ wastewater treatment plants is a potential source for biogas energy recovery via anaerobic digestion. However, the oily-biological sludge’s carbon/nitrogen (C/N) ratio is lower than the ideal 20–30 ratio required by anaerobic digestion technology for biogas production. Sugarcane bagasse can be digested as a high C/N co-substrate while the oily-biological sludge acts as a substrate and inoculum to improve biogas production. In this study, the best C/N with co-substrate volatile solids (VS)/inoculum VS ratios for the co-digestion process of mixtures were determined empirically through batch experiments at temperatures of 35–37 °C, pH (6–8) and 60 rpm mixing. The raw materials were pre-treated mechanically and thermo-chemically to further enhance the digestibility. The best condition for the sugarcane bagasse delignification process was 1% (w/v) sodium hydroxide, 1:10 solid-liquid ratio, at 100 °C, and 150 rpm for 1 h. The results from a 33-day batch anaerobic digestion experiment indicate that the production of biogas and methane yield were concurrent with the increasing C/N and co-substrate VS/inoculum VS ratios. The total biogas yields from C/N 20.0 with co-substrate VS/inoculum VS 0.06 and C/N 30.0 with co-substrate VS/inoculum VS 0.18 ratios were 2777.0 and 9268.0 mL, respectively, including a methane yield of 980.0 and 3009.3 mL, respectively. The biogas and methane yield from C/N 30.0 were higher than the biogas and methane yields from C/N 20.0 by 70.04 and 67.44%, respectively. The highest biogas and methane yields corresponded with the highest C/N with co-substrate VS/inoculum VS ratios (30.0 and 0.18), being 200.6 mL/g VSremoved and 65.1 mL CH4/g VSremoved, respectively. View Full-Text
Keywords: anaerobic co-digestion; oily-biological sludge; sugarcane bagasse; biogas; hazard waste management; biomethane anaerobic co-digestion; oily-biological sludge; sugarcane bagasse; biogas; hazard waste management; biomethane
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MDPI and ACS Style

Ghaleb, A.A.S.; Kutty, S.R.M.; Salih, G.H.A.; Jagaba, A.H.; Noor, A.; Kumar, V.; Almahbashi, N.M.Y.; Saeed, A.A.H.; Saleh Al-dhawi, B.N. Sugarcane Bagasse as a Co-Substrate with Oil-Refinery Biological Sludge for Biogas Production Using Batch Mesophilic Anaerobic Co-Digestion Technology: Effect of Carbon/Nitrogen Ratio. Water 2021, 13, 590. https://doi.org/10.3390/w13050590

AMA Style

Ghaleb AAS, Kutty SRM, Salih GHA, Jagaba AH, Noor A, Kumar V, Almahbashi NMY, Saeed AAH, Saleh Al-dhawi BN. Sugarcane Bagasse as a Co-Substrate with Oil-Refinery Biological Sludge for Biogas Production Using Batch Mesophilic Anaerobic Co-Digestion Technology: Effect of Carbon/Nitrogen Ratio. Water. 2021; 13(5):590. https://doi.org/10.3390/w13050590

Chicago/Turabian Style

Ghaleb, Aiban A.S., Shamsul R.M. Kutty, Gasim H.A. Salih, Ahmad H. Jagaba, Azmatullah Noor, Vicky Kumar, Najib M.Y. Almahbashi, Anwar A.H. Saeed, and Baker N. Saleh Al-dhawi. 2021. "Sugarcane Bagasse as a Co-Substrate with Oil-Refinery Biological Sludge for Biogas Production Using Batch Mesophilic Anaerobic Co-Digestion Technology: Effect of Carbon/Nitrogen Ratio" Water 13, no. 5: 590. https://doi.org/10.3390/w13050590

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