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eISSN: 2083-5906
ISSN: 1230-1485
ISSN: 1230-1485
REVIEW PAPER
Synergistic Effects of Sewage Sludge-Coal
Co-Combustion: A Path to Sustainable
Waste Treatment
1
School of Electric Power, Civil Engineering and Architecture, Shanxi University, Taiyuan, 030006, P.R. China
Submission date: 2024-08-07
Final revision date: 2025-05-20
Acceptance date: 2025-06-10
Online publication date: 2025-09-23
Corresponding author
Yanlin Wang
School of Electric Power, Civil Engineering and Architecture, Shanxi University, Taiyuan, 030006, P.R. China;, China
School of Electric Power, Civil Engineering and Architecture, Shanxi University, Taiyuan, 030006, P.R. China;, China
KEYWORDS
TOPICS
ABSTRACT
The co-combustion of sewage sludge from coal-fired power plants with coal represents a promising
technology for the reduction, stabilization, harmlessness, and resourceful treatment of solid waste
sludge. This paper summarizes the co-combustion characteristics of sludge and coal from aspects such
as the basic combustion process, influencing factors of combustion properties, slagging/fouling, etc.
Sludge can improve coal’s ignition and burnout performance, while coal reduces slagging/ash deposition
risk during sludge combustion. The interactions between sludge and coal during co-combustion
are analyzed, with the intensity and manifestation of these interactions (synergistic or inhibitory)
depending on factors such as the physicochemical properties of the fuels, mixing ratios, and combustion
conditions. Additionally, the emission characteristics and control technologies for both conventional
pollutants (nitrogen oxides, sulfur dioxide, and heavy metals) and unconventional pollutants (dioxins)
during co-combustion are introduced. This mainly introduces the impact of combustion technology on
nitrogen oxide emissions, as well as the role of mineral types and their interactions in the emissions of
sulfur dioxide, heavy metals, and dioxins.
CONFLICT OF INTEREST
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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