College of Resources and Environmental Science, China Agricultural University, Beijing 100193, China.
Chemosphere. 2013 Oct;93(7):1393-9. doi: 10.1016/j.chemosphere.2013.07.002. Epub 2013 Aug 31.
This study investigated the effect of bulking agents on the maturity and gaseous emissions of composting kitchen waste. Three different bulking agents (cornstalks, sawdust, and spent mushroom substrate) were used to compost kitchen waste under aerobic conditions in 60-L reactors for a 28-d period. A control treatment was also studied using kitchen waste without a bulking agent. During the experiment, maturity indexes such as temperature, pH value, C/N ratio, and germination index were determined, and continuous measurements of leachate and gaseous emissions (CH₄, N₂O, and NH₃) were taken. The results showed that all of the composts with bulking agents reached the required maturity standard, and the addition of spent mushroom substrate gave the highest maturity (C/N ratio decreased from 23 to 16 and germination index increased from 53% to 111%). The bulking agents also reduced leachate production and CH₄ and N₂O emissions, but had little impact on NH3 emissions. Composting with sawdust as a bulking agent was found to emit less total greenhouse gas (33 kg CO₂-eqt(-1) dry matter) than the other treatments.
本研究探讨了膨化剂对堆肥厨余物成熟度和气体排放的影响。在 60L 反应器中，采用三种不同的膨化剂（玉米秸秆、木屑和废蘑菇基质），在有氧条件下对厨余垃圾进行为期 28 天的堆肥。还研究了不添加膨化剂的厨余垃圾作为对照处理。实验过程中，测定了温度、pH 值、C/N 比和发芽指数等成熟度指标，并对渗滤液和气体排放（CH₄、N₂O 和 NH₃）进行了连续测量。结果表明，所有添加膨化剂的堆肥都达到了所需的成熟标准，添加废蘑菇基质的堆肥成熟度最高（C/N 比从 23 降至 16，发芽指数从 53%提高至 111%）。膨化剂还减少了渗滤液的产生和 CH₄ 和 N₂O 的排放，但对 NH₃ 的排放影响不大。以木屑作为膨化剂的堆肥发现，其总温室气体排放量（33kgCO₂-eqt(-1)干物质）低于其他处理。
