Biomethane potential (BMP) of arrowroot powder processing waste and effect of alkaline pre-treatment

As the results, BMP of the original arrowroot waste sample was 253 NmLCH4/gVS and alkaline pretreatment increased BMP of the waste % at 7 % NaOH. The reduction of lignin content and hemicellulose content at this pretreatment were % and %, respectively. The results show that the waste has potential for methane recovery and alkaline pre-treatment by NaOH would slightly improve its biodegradability. | Vietnam Journal of Science and Technology 56 (2C) (2018) 171-177 BIOMETHANE POTENTIAL (BMP) OF ARROWROOT POWDER PROCESSING WASTE AND EFFECT OF ALKALINE PRE-TREATMENT Nguyen Pham Hong Lien1, *, Tran Dac Chi1, Hidenori Harada2, Shigeo Fujii2 1 2 School of Environmental Science and Technology, Hanoi University of Science and Technology, 1 Dai Co Viet, Ha Noi, Viet Nam Graduate School of Global Environmental Studies, Kyoto University, Yoshidahonmachi, Sakyo Ward, Kyoto, 606-8501, Japan * Email: Received: 16 May 2018; Accepted for publication: 22 August 2018 ABSTRACT Arrowroot waste has been being discharged without treatment in powder/starch processing villages in Viet Nam causing serious environmental problem. This waste is degradable and might have good Biomethane Potential (BMP) which leads to a possibility to treat them by anaerobic digestion. Therefore, the study aimed to find out the BMP of the waste and to find out if alkaline pre-treatment would improve it. Solid waste from arrowroot powder processing was collected in Duong Lieu village, Ha Noi, and different samples were going through BMP test: the untreated sample and NaOH pre-treated samples at different NaOH dose from 3 to 9 wt. % (dry weight based). BMP was determined in 590 mL bottles at 37 oC for 50 days. As the results, BMP of the original arrowroot waste sample was 253 NmLCH4/gVS and alkaline pretreatment increased BMP of the waste % at 7 % NaOH. The reduction of lignin content and hemicellulose content at this pretreatment were % and %, respectively. The results show that the waste has potential for methane recovery and alkaline pre-treatment by NaOH would slightly improve its biodegradability. Keywords: biomethane potential, arrowroot waste, alkaline pre-treatment. 1. INTRODUCTION Currently in Viet Nam, many trade villages with small-scale food processing industry is facing serious environmental problem associated with un-treated waste residue. .

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