Global J. Environ. Sci. Manage. 7(1): 33-46, Winter 2021 *Corresponding Author: Email: purwono.ga@gmail.com Phone: +8564 0674048 Fax: +6271 781516 Global Journal of Environmental Science and Management (GJESM) Homepage: htps://www.gjesm.net/ ORIGINAL RESEARCH PAPER Calorifc and greenhouse gas emission in municipal solid waste treatment using biodrying B. Zaman 1 , W. Oktawan 1 , M. Hadiwidodo 1 , E. Sutrisno 1 , P. Purwono 2,* 1 Department of Environmental Engineering Faculty of Engineering Diponegoro University, Semarang, Indonesia 2 Center Science and Technology, IAIN Surakarta, Pandawa, Pucangan, Kartasura, Indonesia BACKGROUND AND OBJECTIVES: Urban intensity and actvites produce a large amount of biodegradable municipal solid waste. Therefore, biodrying processing was adopted to ensure the conversion into Refuse Derived Fuel and greenhouse gases.. METHODS: This study was performed at a greenhouse, using six biodrying reactors made from acrylic material, and equipped with digital temperature recording, blower, and fow meters. The variatons in airfow (0, 2, 3, 4, 5, 6 L/min/kg) and the bulking agent (15%) were used to evaluate calorifc value, degradaton process and GHG emissions. FINDINGS: The result showed signifcant efect of airfow variaton on cellulose content and calorifc value. Furthermore, the optmum value was 6 L/min/kg, producing a 10.05% decline in cellulose content, and a 38.17% increase in calorifc value. Also, the water content reduced from 69% to 40%. The CH4 concentraton between control and biodrying substantally varied at 2.65 ppm and 1.51 ppm respectvely on day 0 and at peak temperature. Morever, the value of N2O in each control was about 534.69 ppb and 175.48 ppb, while the lowest level was recorded afer biodrying with 2 L/min/kg airfow. CONCLUSION: The calorifc value of MSW afer biodrying (refuse derived fuel) ranges from 4,713 – 6,265 cal/g. This is further classifed in the low energy coal (brown coal) category, equivalent to <7,000 cal/g. Therefore, the process is proven to be a suitable alternatve to achieve RDF producton and low GHG emissions. ©2021 GJESM. All rights reserved. ARTICLE INFO Artcle History: Received 10 April 2020 Revised 31 July 2020 Accepted 09 August 2020 Keywords: Biodrying Greenhouse gas MSW Refuse derived fuel Temperature ABSTRACT DOI: 10.22034/gjesm.2021.01.03 NUMBER OF REFERENCES 43 NUMBER OF FIGURES 11 NUMBER OF TABLES 2 Note: Discussion period for this manuscript open untl April 1, 2021 on GJESM website at the “Show Artcle.