Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
Sci Total Environ. 2022 Mar 10;811:152415. doi: 10.1016/j.scitotenv.2021.152415. Epub 2021 Dec 16.
Electric field-assisted aerobic composting (EAC) has been recently believed as a novel and effective process for the resource utilization of organic solid waste. However, the effect of electric field in composting process needs to be further clarified. Herein, moisture migration and compost maturity along electric-field-direction (from anode to cathode) in EAC was first to be explored. It was found that moisture content and compost maturity changed regularly from anode to cathode. At the end of composting, the moisture content of S3 (cathodic zone) was 30% and 62% higher than that of S2 (middle zone) and S1 (anodic zone), respectively. The germination index (a key parameter for compost maturity) in S3 (138.92%) was significantly higher than that of S2 (104.98%) and S1 (84.45%). However, temperatures in S3 were lower than that of S1 and S2, indicating the moisture content played a more important role than temperature for compost maturity in EAC. Furthermore, the microbial activities in S3 were also higher than that of S1 and S2, supporting the trend of compost maturity. This pioneering study demonstrates the electric field can drive moisture gradient migration to control the directional differentiation of compost maturity, showing a great application potential in aerobic composting.
电场辅助好氧堆肥（EAC）最近被认为是一种新颖且有效的有机固体废物资源利用方法。然而，电场在堆肥过程中的作用仍需进一步阐明。在此，首次探索了 EAC 沿电场方向（从阳极到阴极）的水分迁移和堆肥成熟度。结果发现，水分含量和堆肥成熟度从阳极到阴极呈规律性变化。堆肥结束时，S3（阴极区）的水分含量分别比 S2（中区）和 S1（阳极区）高 30%和 62%。S3 的发芽指数（堆肥成熟度的关键参数）（138.92%）明显高于 S2（104.98%）和 S1（84.45%）。然而，S3 的温度低于 S1 和 S2，表明在 EAC 中，水分含量对堆肥成熟度的影响大于温度。此外，S3 的微生物活性也高于 S1 和 S2，这也支持了堆肥成熟度的趋势。这项开拓性研究表明，电场可以驱动水分梯度迁移，从而控制堆肥成熟度的定向分化，在好氧堆肥中具有很大的应用潜力。
