Effects of biochar type and doping ratio on wetland soil carbon dioxide emissions from food waste digestate
CO2 emissions from wetland soil account for 11％of global carbon emissions and are an important source of greenhouse gases in the atmosphere.How to achieve CO2 emission reduction in wetland soil has become a research focus.In this study,the biogas residue,a byproduct of anaerobic digestion of food waste,as raw material to prepare biogas residue biochar at different pyrolysis temperatures to evaluate its leaching toxicity,and set different doping ratios to be added to wetland soil to explore the effects of biogas residue biochar on CO2 emissions of wetland soil.The results showed that the heavy metal leaching concentration of digestate biochar was much lower than the standard limit of Class Ⅱ surface water,and it was a safe and reliable biochar material.The type of biochar and its doping ratio significantly affect soil CO2 emission.When the pyrolysis temperature was 600 ℃ and the doping ratio was 30％,the emission reduction effect reached 82.69％.Combined with the characterization results,it was found that there was a significant correlation between micropore volume and emission reduction effect(R2＞0.90).This study can provide theoretical support for the utilization of food waste digestate in soil carbon sequestration.
万方数据
维普
