Enhancing anaerobic digestion of wild seaweed Gracilaria verrucosa by co-digestion with tofu dregs and washing pre-treatment

Suhartini, Sri and Indah, Salsabila Harisma and Rahman, Farid Abdul and Rohma, Novita Ainur and Rahmah, Nur Lailatul and Nurika, Irnia and Hidayat, Nur and Melville, Lynsey (2022) Enhancing anaerobic digestion of wild seaweed Gracilaria verrucosa by co-digestion with tofu dregs and washing pre-treatment. Biomass Conversion and Biorefinery. ISSN 2190-6815

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Marine biomass (such as wild seaweed Gracilaria verrucosa) is highly abundant in Indonesia and has been highlighted as a potential biomass resource for bioenergy production. Furthermore, agro-industrial waste (such as tofu dregs/TD which arises from large-scale production in the country) is rich in carbohydrates and proteins, and is therefore considered a viable feedstock for production of high-value added products. This study aimed to investigate the co-digestion of wild seaweed G. verrucosa (WGv) with TD and its impacts on biogas and methane production. The biochemical methane potential (BMP) test was operated for 28 days at temperature of 37 °C. The co-digestion of WGv with TD at 90:10 and 80:20 ratios significantly increased the specific methane potential (SMP), giving an average of 98 LCH4/kgVS and 120 L CH4/kgVS, respectively. Addition of co-digestion substrates promoted co-metabolism in the digesters, increasing the ability of the microorganism to effectively digest the organic matter present in the feedstock’s mixture. The washing pre-treatment reduced the concentration of inorganic compounds and salts within the wild seaweed G. verucosa, leading to an improvement in biogas and methane yield. The mass balance illustrated that this process configuration led to a reduction in the quantity of digestate to be managed (i.e. dewatering, transport, and land/soil application). This will subsequently reduce the cost and energy requirements for sludge management, estimated at 37%. Therefore, the co-digestion of WGv with TD and the application of a washing pre-treatment stage prior to AD can positively enhance biogas and methane production. In-depth investigation for optimal valorisation using AD technology is highly essential.

Item Type: Article
Identification Number: https://doi.org/10.1007/s13399-022-02507-z
22 February 2022Accepted
5 March 2022Published Online
Uncontrolled Keywords: anaerobic co-digestion; co-metabolism; marine macroalgae; synergistic effect; wild Gracilaria verrucosa
Subjects: CAH10 - engineering and technology > CAH10-03 - materials and technology > CAH10-03-05 - biotechnology
Divisions: Faculty of Computing, Engineering and the Built Environment > School of Engineering and the Built Environment
Depositing User: Lynsey Melville
Date Deposited: 09 Mar 2022 11:40
Last Modified: 05 Mar 2023 03:00
URI: https://www.open-access.bcu.ac.uk/id/eprint/12936

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