Optimizing Sludge Incineration for Thermal Energy Recovery: A Sustainable Approach to Industrial Waste Management

This research investigates the effectiveness of incineration as a sustainable solution for converting industrial sludge into thermal energy. A modular sludge incinerator integrating Bubbling Fluidized Bed (BFB) drying with Circulating Fluidized Bed (CFB) combustion is modelled by numerical simulation and validated empirically or experimentally. The system enhances sludge drying efficiency, enabling a seamless transition to combustion, and maximizing energy recovery while minimizing emissions.
Findings show up to 95% sludge volume reduction, effective pathogen destruction, and energy values comparable to low-rank fuels like biomass are possible. Optimized combustion conditions, regulated sludge feeding, air-fuel and return air ratios, sludge recirculation, and controlled temperature profiles enhance efficiency and mitigate Carbon Monoxide (CO), Nitrogen Oxides (NOx), Dioxins, and Furans. Inbuilt advanced flue gas cleaning ensures compliance with environmental standards .
Economically, sludge incineration reduces fossil fuel dependency and operational costs, supporting carbon reduction targets. Environmentally, it minimizes land use, greenhouse gas emissions, and aligns with circular economy principles. Policy measures, financial incentives, and regulatory frameworks are crucial for adoption.
This study bridges gaps in waste-to-energy strategies, providing a scalable, flexible, sustainable model for industrial sludge management. The integrated BFB-CFB incineration system demonstrates a viable pathway for energy recovery, contributing to Sri Lanka’s energy transition and sustainable industrial operations.