2026-09-21T21:41:37Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/120468 2023-09-05 col_2142_5131 col_2142_14770 com_2142_5130 com_2142_3518 com_2142_234

Cusick, Ro D Guest, Jeremy S 2023-05 application/pdf en text Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-05-01 The student, Lane To, accepted the attached license on 2023-05-05 at 13:43. The student, Lane To, submitted this Thesis for approval on 2023-05-05 at 13:54. This Thesis was approved for publication on 2023-05-05 at 14:31. DSpace SAF Submission Ingestion Package generated from Vireo submission #19358 on 2023-09-01 at 17:16:20 Modeling the impact of feedstock composition and operating temperature on carbon sequestration potential of fecal sludge-derived biochar To, Lane 2023-05-05 Biochar Carbon Sequestration Pyrolysis Fecal Sludge Management Non-sewered Sanitation Decentralized Sanitation Omni Processors (OPs) are community-scale sanitation technologies that can provide decentralized fecal sludge management in areas where sewered sanitation is not feasible. Pyrolytic OPs leverage oxygen-limited thermal treatment to convert fecal sludge into biochar, a graphitic solid which sequesters carbon and improves soil quality. While the general environmental benefits of biochar are known, specific characteristics and carbon sequestration potential of biochar depend on pyrolysis conditions and feedstock composition. It is difficult to accurately assess the benefits of biochar produced in a pyrolytic OP without this context. In this work, a pyrolytic OP was modeled using QSDsan, an open-source quantitative sustainable design tool. Building on an existing process model, additional empirical relations were incorporated to link pyrolysis temperature and feedstock characteristics to biochar yield and carbon sequestration potential. Altogether, the integrated model was used to evaluate system costs, lifecycle environmental impacts, and the fate of carbon and nutrients. By simulating the performance of the system across feedstock ash content from 15% to 75% and at temperatures from 300°C to 900°C, the relative importance of these parameters for yield and carbon sequestration was characterized. Simulations revealed positive correlations between pyrolysis temperature and biochar yield, feedstock ash content and biochar yield. The trends identified in this study can be used to generate insight to optimize biochar production and carbon sequestration potential, and according to context-specific needs. Text eng https://hdl.handle.net/2142/120468 Copyright 2023 Lane To M.S. Thesis Environ Engr in Civil Engr University of Illinois at Urbana-Champaign Civil & Environmental Eng