我国农作物残体制生物炭的固碳潜势和环境影响

Carbon Sequestration Potential and Environmental Impacts of Utilizing Crop Residues for Biochar Implementation in China

应用生命周期评价方法并结合Gabi软件量化了我国农作物残体在生物炭制备及其土壤应用过程中的固碳潜势和环境影响.结果表明:生物炭系统的年度GWP100值(100年尺度下的全球变暖潜势)可达-921.66 kg CO_(2e),能显著提高我国的固碳量;碳负性的实现主要依赖于所产生的生物油和热解气抵消燃煤发电,以及生物炭入土实现的碳固存,其中,生物炭产率对整个系统固碳潜势的影响最大;生物炭系统对人类毒性潜势、酸化潜势等环境问题均有改善和缓解;生物炭应用的环境可行性较强.

The carbon sequestration potential and environmental impacts of crop residue biochar implementation in China are quantified by using life cycle assessment combined with Gabi software.The results show that the annual GWP100(global warming potential at 100-year scale)value of the biochar system can reach-921.66 kg CO_(2e),which can significantly improve the carbon sequestration in China;The realization of negative carbon emission mainly depends on the bio-oil and pyrolysis gas generated to offset the coal-fired generation,and the carbon storage realized by biochar in the soil.Among all the parameters,the biochar yield has the greatest influence on the carbon sequestration potential of the whole system;the biochar system can also alleviate human toxicity potential,acidification potential and other environmental problems;the environmental feasibility of biochar implementation is confirmed.