期刊
RESOURCES CONSERVATION AND RECYCLING
卷 181, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.resconrec.2022.106273
关键词
Sewage sludge; Pyrolysis technology; Bio-oil; Biochar; Activated carbon; Life-cycle assessment
资金
- Mathematics of Information Technology and Complex Systems (Mitacs) [IT14321, IT19789]
- Environmental Careers Organization of Canada (ECO Canada) Co-op Program in the Student Work Placement Program - Employment and Social Development Canada [18,692]
- ECO Canada in the Science Horizons Youth Internship Program - Environment and Climate Change Canada [8,162,021]
- Kerr Wood Leidal Associates Ltd.
This study evaluates the feasibility of pyrolysis scenarios for sewage sludge treatment using life-cycle assessment, energy consumption analysis, carbon emission analysis, and economic benefit analysis. Results show that pyrolysis scenarios producing bio-oil and biochar have significant improvement in terms of environmental impact and profitability, making them eco-friendly sewage sludge treatment methods.
This study aimed to determine the feasibility of pyrolysis scenarios as sewage sludge treatment processes through cradle-to-gate life-cycle assessment and additional energy consumption, carbon emission, and economic benefit analyses, considering circular economy principles. The examined pyrolysis scenarios include slow pyrolysis with various residence times to produce activated carbon (AC) or biochar and fast pyrolysis to produce bio-oil, all with internal gas energy recovery. The functional unit (FU) in this study comprises 1000 kg of dried sludge entering the pyrolysis reactor. The overall evaluation and new product application routes address gaps in current studies on sludge treatment via pyrolysis. Environmentally, the bio-oil (-0.31 kg CO2-eq/kg FU) and biochar (-0.05 kg CO2-eq/kg FU) scenarios show considerable improvement over contemporary pyrolysis and other conventional sludge treatment methods. The AC scenarios have higher toxicity but lower carbon emissions (1.50-1.70 kg CO2- eq/kg FU) than contemporary AC production processes. Chemical reagent usage has significant effects on the environmental burden of AC production processes. The biochar and bio-oil pyrolysis scenarios achieve net energy recovery through product applications. Although the AC scenarios still require energy input, this demand can be significantly reduced by optimising moisture removal processes. Operating cost analysis indicates that the examined pyrolysis scenarios are potentially profitable. Primary product yield and market value are significant factors determining the net profit of these pyrolysis scenarios, but further assessment of capital costs is required. This study shows that bio-oil and biochar pyrolysis are eco-friendly sewage sludge treatment methods.
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