School of Environmental Science & Technology, Dalian University of Technology, Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian 116024, Liaoning, China.
School of Environmental Science & Technology, Dalian University of Technology, Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), Dalian 116024, Liaoning, China.
Waste Manag. 2019 Apr 15;89:165-176. doi: 10.1016/j.wasman.2019.04.004. Epub 2019 Apr 6.
In this study, thermal assistance was employed in the cooling stage of conventional biodrying. The results indicated that thermal assistance greatly enhanced water removal with improved vapor-carrying capacity of air-flow, and rapidly decreased moisture contents (MCs) from 45.15% to 49.42% to 15.20-25.85% in 6 days, which were much lower than those of conventional biodrying (CB, 34.90-40.85%). More importantly, a synergistic enhancement of physical and biological effects was observed in thermally assisted biodrying (TB) in terms of stimulated enzymes activity and microbial metabolism (higher oxygen uptake rate and degradation coefficient k). Among the degraded organics, lignocellulose was noted to be important for bio-heat generation in cooling stages, especially for straw as bulking agent. Heat balance results suggested that small fractions of thermal heat (19.76-24.73%) were required to upgrade CB processes for water evaporation with higher energy efficiency. Based on economic viability analysis and with consideration of the further drying for CB products, thermally assisted biodrying presented more economic benefits with less investment and shorter payback period. This research provided an efficient engineering approach to upgrade the cooling stage of conventional biodrying with low external heat cost.
在这项研究中，热辅助被应用于传统好氧堆肥的冷却阶段。结果表明，热辅助极大地增强了水的去除，提高了气流的载水汽能力，并使水分含量（MCs）在 6 天内从 45.15%迅速降低至 49.42%至 15.20-25.85%，明显低于传统好氧堆肥（CB，34.90-40.85%）。更重要的是，在热辅助好氧堆肥（TB）中观察到物理和生物效应的协同增强，表现在酶活性和微生物代谢的刺激（更高的耗氧速率和降解系数 k）。在降解的有机物中，木质纤维素被认为是冷却阶段生物产热的重要因素，特别是对于作为膨松剂的秸秆。热平衡结果表明，仅需少量的热（19.76-24.73%）即可提高 CB 工艺的水蒸发效率，从而实现更高的能源效率。基于经济可行性分析，并考虑到 CB 产品的进一步干燥，热辅助好氧堆肥具有更低的投资和更短的投资回报期，具有更大的经济效益。本研究为升级传统好氧堆肥的冷却阶段提供了一种高效的工程方法，该方法的外部热成本较低。
