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Adopting green absorbent for CO_(2)capture and agricultural utilization: Biogas slurry and biomass ash case

Green Carbon 2024年第2期2卷 252-261页

作者： Feihong Liang Shihui Wei Lu Xue Shuiping Yan College of Life Science Yulin UniversityYulin 719000PR China College of Engineering Huazhong Agricultural UniversityWuhan 430070PR China Technology&Equipment Center for Carbon Neutrality in Agriculture Huazhong Agricultural UniversityWuhan 430070PR China Carbon Neutral College(Yulin) Northwest UniversityXi’an 710069PR China

Previously,the once-through CO_(2)chemical absorption process by biogas slurry was experimentally verified to offer the unique advantages like low energy consumption,cost-effectiveness,and feasibility of CO_(2)fixation in ***,this technology also faces some challenges and limitations,including a low CO_(2)absorption rate and *** improve the effectiveness and reliability of this innovative carbon capture,utilization,and storage(CCUS)technology,this study proposes a novel method to enhance the CO_(2)absorption performance without affecting agricultural applications of CO_(2)by mixing biogas slurry with biomass ash as the green CO_(2)*** results indicate that when the solid-liquid mass ratio of biomass ash to biogas slurry is 5:10,the CO_(2)loading of the biomass ash and biogas slurry mixture(BA-BS)reaches 936.7±59.1 mmol/***,the pH of the BA-BS remains stable at 6.9,meeting the rhizosphere pH requirements for plant *** CO_(2)absorption of the BA-BS liquid phase,referred to as improved biogas slurry(IBS),reaches its maximum at 230.4±3.5 mmol/L,which is 126.8%higher than that of the unimproved biogas *** nitrogen content in the BA-BS solid phase,calling improved biomass ash(IBA),also reaches its maximum at 4.24±0.74 mg/g,thereby expanding the agricultural utilization of biomass *** most reasonable and effective way of utilizing CO_(2)-rich mixed biogas slurry and biomass ash involves use IBA as the base fertilizer for tomato cultivation,supplemented later with IBS to promote *** optimal application allows for substantial utilization of CO_(2),introduced into the tomato cultivation environment by IBA and *** carbon fixation of a single tomato has improved by 108.2%.This study thus provides a feasible solution for high-value negative carbonization of biogas slurry and biomass ash.

关键词： Biogas slurry Biomass ash CO_(2)capture CO_(2)fixation agricultural utilization

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