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Rice straw for energy and value-added products in China: a review
Ahmed Alengebawy1,2, Yi Ran1,3, Nirmal Ghimire4
1College of Engineering, Huazhong Agricultural University, Wuhan, 430070 China.
Environmental Chemistry Letters
|June 26, 2023
Summary
Rice straw can be recycled into valuable biogas and biofertilizer, overcoming processing challenges through pretreatment methods. This agricultural waste offers significant potential energy, supporting a sustainable bioeconomy.
Area of Science:
- Agricultural Science
- Energy Science
- Environmental Science
Background:
- Global waste generation and fossil fuel depletion necessitate waste-to-energy solutions.
- Rice straw presents a viable, yet challenging, feedstock for conversion into energy and valuable by-products.
- Current limitations include low energy content, high ash/silica, and variability in rice straw quality.
Purpose of the Study:
- To review the potential of rice straw recycling for energy and materials.
- To analyze the global and Chinese energy contexts related to rice straw utilization.
- To explore methods for improving rice straw quality and managing its conversion by-products.
Main Methods:
- Literature review focusing on rice straw's energy potential and conversion technologies.
- Analysis of pretreatment methods (baling, ensiling, co-digestion) to enhance rice straw quality.
- Examination of biogas upgrading, digestate management, and life cycle assessment.
Main Results:
- Pretreatments like ensiling and co-digestion improve rice straw quality for processing.
- Biogas digestate can be effectively utilized as a soil fertilizer.
- Annual potential energy from collectable rice straw is estimated at 2.41 × 10^9 megajoule.
Conclusions:
- Rice straw recycling is a promising avenue for sustainable energy and bio-product generation.
- Optimizing pretreatment and management strategies enhances the economic and environmental viability of rice straw conversion.
- Significant energy potential exists within collectable rice straw resources.
Keywords:
BiofertilizerBiogas productionBiorefineryEnvironmental impact assessmentLife cycle assessmentRice strawMore Related Videos
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