An accelerated and automated composting process for on-site treatment of food waste in remote mining operations has been evaluated by researchers. Their findings, published in Applied Sciences, have shown the possible operational, environmental, and economic benefits of this method compared to conventional landfill disposal.
Study: Accelerated Composting for Sustainable Food Waste Management in Remote Mining Operations: A Comprehensive Assessment. Image Credit: Nicholas J Klein/Shutterstock.com
Food Waste Challenges in Mining
Mining operations situated in remote, high-altitude regions face significant challenges in managing organic waste, especially food waste generated on site. Traditional disposal methods, such as landfill use, entail complex logistics, elevated transportation costs, and notable environmental impacts, including greenhouse gas emissions.
These issues are exacerbated in harsh Andean environments where adverse weather and poor road infrastructure complicate waste transport. Given that organic waste can comprise 60–70% of the waste generated in many developing countries, devising sustainable and efficient on-site treatment solutions is vital.
Composting, widely recognized for waste valorization and a reduced carbon footprint compared to landfilling, has been constrained in such settings by climatic factors that reduce biodegradation efficiency.
Accelerated Composting Evaluation Setup
The study was conducted at the Cerro Corona mining unit in the high Andean region of Hualgayoc, Cajamarca, Peru.
The food waste used originated from the site’s dining hall and consisted of mixed organic residues, from vegetables to meat trimmings, with moisture content between 50% and 85%. To treat 186.9 megagrams (Mg) of food waste over 14 months, the mining operation installed an Ecobot EB-1000, a mechanized accelerated composting unit capable of handling up to 1000 kg per day.
Operational performance was tracked through production records measuring the conversion rates of food waste to compost and processing throughput. Environmental impacts were assessed by estimating greenhouse gas emissions associated with both conventional landfill disposal and the accelerated composting process, excluding internal transportation emissions and considering direct emissions measurements from the compost unit.
An economic analysis compared the overall costs, factoring in capital expenses, depreciation, operating costs, emissions offset costs, and revenue generated through compost sales against existing landfill disposal expenses.
Finally, the compost product was sampled and analyzed physicochemically and microbiologically to evaluate compliance with national and international standards for agricultural use and safety.
Download a copy of this news article for later here!
Operational, Environmental, and Economic Outcomes
The accelerated composting process demonstrated stable operational performance throughout the trial period. The conversion efficiency of food waste into compost averaged 32±7%, consistent with expected mass losses from dehydration and organic matter oxidation.
The system’s throughput averaged 24.7 kg of food waste treated per hour, translating into a daily capacity of roughly 590 kg. This level of productivity indicates that the unit can effectively process a substantial portion of the mine’s organic waste on site without requiring additional curing or maturation phases, facilitating immediate storage or direct use of compost.
Compared to conventional landfill disposal, accelerated composting significantly reduced greenhouse gas emissions. Over the full assessment, composting avoided approximately 32,630 kg of CO2 equivalent emissions, corresponding to 0.17 kg CO2e per kg of food waste treated, representing a 38% reduction relative to landfill disposal emissions estimated at 0.44 kg CO2e per kg wasted.
From an economic standpoint, while total operational costs for accelerated composting were higher than landfill disposal by approximately $27,269.03 due to equipment, energy, and maintenance expenses, revenue from compost sales partially offset these costs.
Ultimately, the composting model yielded savings of $41.52 per Mg of food waste processed after considering emissions offset pricing and product valorization. Energy consumption, primarily electricity for machinery, comprised a significant proportion of operating costs, highlighting an opportunity for efficiency improvements.
The accelerated composting system exhibited benefits over conventional open-air composting commonly practiced through windrows or aerated static piles. Unlike these methods, which are climate-dependent, require large land areas, and need lengthy treatment periods of weeks to months, the mechanized system offers a controlled environment ensuring thermophilic temperatures and pathogen inactivation within approximately 36 hours.
Quality assessment of the compost product confirmed that it generally met the Peruvian Technical Regulation for fertilizers and international Class A standards for compost safety. Key physicochemical parameters such as moisture content (7–22%) and bulk density were within or below normative limits, suggestive of well-stabilized compost.
The pH ranged from acidic to neutral (4.6–7.8), with lower values potentially associated with organic acids formed during earlier or intermediate stages of decomposition. Electrical conductivity was sometimes elevated, indicating high salinity, likely associated with sodium content averaging 11.23 g/kg. High salinity could limit agricultural application due to osmotic effects on plants and would require dosage adjustments, particularly in salt-sensitive crops.
Sustainability Potential of Accelerated Composting
This research validates the implementation of an accelerated, automated composting system as an effective solution for managing food waste on site at remote mining operations. The system addresses logistical challenges characteristic of mining camps in high-altitude, environmentally harsh regions by minimizing transportation requirements and associated emissions.
The proposed model is replicable across isolated or environmentally constrained mining and industrial settings and supports circular economy strategies by linking waste management with resource recovery and land restoration. This holistic approach offers mining companies a practical pathway toward sustainable organic waste valorization under remote operational conditions.
Journal Reference
Cueva C., Zegarra E., et al. (2026). Accelerated Composting for Sustainable Food Waste Management in Remote Mining Operations: A Comprehensive Assessment. Applied Sciences. 16(15). DOI: 10.3390/app16157440. https://www.mdpi.com/2076-3417/16/15/7440.