Abstract
Most of the municipal solid waste collected is disposed of in landfills and controlled landfills. However, efficient ways of recovering these wastes have emerged, such as bio-drying. This technique uses the exothermic degradation reaction of organic matter carried out by microorganisms along with aeration to reduce the moisture of the waste. The objective of the research was to test the bio-drying technique in a rotary drum. For this purpose, three rotary drums were built, and the tested residue was synthetically produced. The aeration rate tested was 1 liter per kilogram per minute, and rotation was performed for one minute every three hours. The analyses performed on the residues were moisture content, volatile solids, calorific value, particle size, and temperature profile. The residues entered the bio-drying process with a moisture content of 52%, 49%, and 54% and went out with 15%, 13%, and 10% for drum 1, 2, and 3, respectively, a reduction of more than 70%. The calorific value increased by 95%, 88%, and 122% for drum 1, 2, and 3, respectively. During the process, no leachate generation was observed.
Highlights
Population growth, together with current society’s consumption habits, economic development, degree of industrialization, and regional climate (Hoornweg & Bhada-Tata 2012, Martínez et al 2013) are the leading causes of the increase in waste generation
The VS reduction is an essential parameter in bio-drying, as microbiological activity reduces the volatile solids content in the waste; a significant drop is not desired (Kristanto & Zikrina 2017), since it decreases the calorific value
There was no trend towards a reduction in the volatile solids content, which is in agreement with the temperature variable, that is, the temperature did not increase due to the low or non-existent microbiological activity; there was no consumption of volatile solids
Summary
Population growth, together with current society’s consumption habits, economic development, degree of industrialization, and regional climate (Hoornweg & Bhada-Tata 2012, Martínez et al 2013) are the leading causes of the increase in waste generation. Global municipal solid waste (MSW) generation levels are around 1.3 billion tonnes per year, with an estimated increase to 2.2 billion tonnes per year by 2025, representing a significant increase in per capita generation from 1.2 to 1.42 kg per day (Hoornweg & BhadaTata 2012). Given the large waste production, both worldwide and nationally, Mendes (2014) stressed that there is a significant concern regarding the proper disposal, that is, that this resource is appropriately valued for reducing the pressure on the environment. MSW management might include source reduction, reuse, separation and recycling, combustion with or without energy recovery, and landfill disposal (Ouda & Raza 2014). In Brazil, NSWP (National Solid Waste Policy) (Brazil 2010) brings an order of priority in waste logistics and management, namely, non-generation, followed by reduction, reuse, recycling, treatment, and environmentally appropriate final disposal
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
