Short communication
Cattle manure, containing lignocellulosic biomass such as sawdust, rice straw, and rice husk as bedding materials, is rich in organic matter and serves as a promising feedstock for biochar for carbon dioxide removal (CDR). However, the characteristics of manure-based biochar vary depending on feedstock composition, composting maturity, and pyrolysis temperature. This study evaluated the properties of cattle manure biochar (CMB) and 100-year carbon sequestration potential of CMB under different process conditions such as composting maturity (fresh and composted), mixing lignocellulosic biomass (sawdust, rice straw, and rice husk) and pyrolysis temperature (400°C, 500°C, and 600°C). CMB produced showed organic carbon contents above 30% for all process conditions. However, only the composted manure pyrolyzed at 400°C achieved an H/Corg molar ratio ≤0.7, a key criterion of international biochar certification as a CDR. Pyrolysis at ≥500°C satisfied this requirement regardless of feedstock types. The potential carbon sequestration of CMB was found to range from 0.68 to 1.67 tCO2-eq per ton of dry biochar, decreasing by approximately 1% for each 1 °C increase in soil temperature under global warming scenario. CMB mixed with lignocellulosic biomass showed higher potential carbon sequestration compared to that without lignocellulosic biomass. At a pyrolysis temperature of 400°C, the composted manure demonstrated a higher potential of carbon sequestration than fresh manure. However, this difference became negligible when the pyrolysis temperature was at 500°C or higher. Therefore, this study suggested that CMB produced at pyrolysis temperatures ≥500 °C could meet an H/Corg molar ratio ≤0.7, with its carbon sequestration potential increasing through the mixing of lignocellulosic biomass such as sawdust, rice straw, and rice husk.
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10.1021/acs.est.1c0242534637286PMC8567415- Publisher :Korean Society of Soil Science and Fertilizer
- Publisher(Ko) :한국토양비료학회
- Journal Title :Korean Journal of Soil Science and Fertilizer
- Journal Title(Ko) :한국토양비료학회 학회지
- Volume : 58
- No :3
- Pages :405-415
- Received Date : 2025-07-30
- Revised Date : 2025-08-11
- Accepted Date : 2025-08-11
- DOI :https://doi.org/10.7745/KJSSF.2025.58.3.405
Korean Journal of Soil Science and Fertilizer
