CHEMICAL ENGINEERING TRANSACTIONS VOL. 80, 2020 A publication of The Italian Association of Chemical Engineering Online at www.cetjournal.it Guest Editors: Eliseo Maria Ranzi, Rubens Maciel Filho Copyright © 2020, AIDIC Servizi S.r.l. ISBN 978-88-95608-78-5; ISSN 2283-9216 Biogas Production from Beverage Industry Wastes by Co- Digestion Fasai Wiwatwongwana a , Ratree Suihirun b , Supawat Vivanpatarakij b, * a Department of Advanced Manufacturing Technology, Faculty of Engineering, Pathumwan Institute of Technology, 833 Rama 1 Road, Wangmai, Pathumwan, Bangkok 10330, Thailand b Energy Research Institute, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok 10330, Thailand supawat.v@chula.ac.th This research investigated biogas production from Co-Digestion of beverage industry waste. The optimum ratio of four beverage wastes were analysed. The anaerobic fermentations were done in 300 mL volumetric flask by batch shaking at normal ambient temperature with controlled of dry substrate at 3 g. The biogas production was collected and measured by water replacement and its composition was evaluated by gas chromatography. The results revealed that the highest amount of biogas was occurred at 750 mL at milk : coffee : beer : energy drink 2:1:1:1 and the ratio 1:1:1:1, 1:2:1:1, 1:1:1:2 and 1:1:2:1 could produce biogas at 709, 577, 467 and 302 mL, respectively and at ratio 2:1:1:1 occurred COD removal from degradation efficiency of organic substances at 69.30 % which was the highest value. Whereas, the ratio 1:1:1:1, 1:2:1:1, 1:1:1:2 and 1:1:2:1 occurred at 46.80, 35.20 and 17.20%, respectively. The result of biogas production was consistency with the result of COD removal in every ratio. It could be summarized that the best ratio of 4 beverage waste was 2:1:1:1 which shown the best in amount of biogas production and degradation efficiency. It could use this ratio to apply in industrial waste application and the production of renewable energy which could help environment. 1. Introduction In present, the domestic industry is rapidly expanding in order to sufficient for the increasing of the consumer. In the manufacturing process, large amounts of waste and waste water are generated at the end of the production process from these industries. These wastewater contains microbes that affects to the environment. This brings to biological treatment in various stages which has a lot of waste water sediment. The final methods of sludge disposal that are commonly used are landfill and incineration. These two methods are costly and affect the environment. The beverage production process causes large amounts of waste water. For example, the amount of wastewater from the beer industry is 65-70 percent, with COD and BOD up to 32,000-75,000 mL/g and 124,630-182,200 mg, respectively (TEI, 2012). In addition, there have a lot of sludge volume of waste water in many treatment ponds. The way to get rid of these sewage sludge is landfill which can cause methane (CH4 ) and carbon dioxide gas (CO 2 ) nitrogen gas (N 2 ) and other gases which cause greenhouse effect (Yechiel and Shevah, 2016) and it is found that these sludge still have high potential for utilization. The amount of methane in 1 ton of garbage can be converted into energy at approximately 0.78 MW which can generate 6,500-10,000 MWh of electricity. The study of the research on the fermentation of waste from the beverage industry and organic fertilizer factory is found that waste from milk industry can cause the maximum amount of methane gas compared to coffee, beer and energy drinks (Toomthong, 2016) The researchers found that the beverage industry still has the potential to be utilized to produce renewable energy by various methods, such as fermentation without oxygen to produce biogas. Therefore, studies on increasing the efficiency of biogas production from the fermentation of waste from 4 beverages are milk : coffee : beer : energy drink in different ratios. Microorganisms can be started from the wastewater treatment ponds of pig farms to find a suitable ratio for the production of biogas from different kinds of beverage waste. According to the research studies reported, it is found that the combined fermentation of more than 1 species of organic substances can increase the DOI: 10.3303/CET2080012 Paper Received: 20 December 2019; Revised: 10 March 2020; Accepted: 7 April 2020 Please cite this article as: Wiwatwongwana F., Suihirun R., Vivanpatarakij S., 2020, Biogas Production from Beverages Industry Waste by Co- digestion, Chemical Engineering Transactions, 80, 67-72 DOI:10.3303/CET2080012 67