Kazemi Khoshrooz, Zhang Baiyu, Lye Leonard M, Cai Qinghong, Cao Tong
Civil Engineering, Faculty of Engineering and Applied Science, Memorial University, St. John's, NL A1B 3X5, Canada.
Waste Manag. 2016 Dec;58:107-117. doi: 10.1016/j.wasman.2016.08.029. Epub 2016 Sep 3.
A design of experiment (DOE) based methodology was adopted in this study to investigate the effects of multiple factors and their interactions on the performance of a municipal solid waste (MSW) composting process. The impact of four factors, carbon/nitrogen ratio (C/N), moisture content (MC), type of bulking agent (BA) and aeration rate (AR) on the maturity, stability and toxicity of compost product was investigated. The statistically significant factors were identified using final C/N, germination index (GI) and especially the enzyme activities as responses. Experimental results validated the use of enzyme activities as proper indices during the course of composting. Maximum enzyme activities occurred during the active phase of decomposition. MC has a significant effect on dehydrogenase activity (DGH), β-glucosidase activity (BGH), phosphodiesterase activity (PDE) and the final moisture content of the compost. C/N is statistically significant for final C/N, DGH, BGH, and GI. The results provided guidance to optimize a MSW composting system that will lead to increased decomposition rate and the production of more stable and mature compost.
本研究采用基于实验设计（DOE）的方法，以研究多种因素及其相互作用对城市固体废物（MSW）堆肥过程性能的影响。研究了四个因素，即碳氮比（C/N）、水分含量（MC）、膨松剂类型（BA）和曝气速率（AR）对堆肥产品成熟度、稳定性和毒性的影响。使用最终C/N、发芽指数（GI），尤其是酶活性作为响应指标，确定具有统计学意义的因素。实验结果验证了酶活性在堆肥过程中作为合适指标的用途。最大酶活性出现在分解的活跃阶段。MC对脱氢酶活性（DGH）、β-葡萄糖苷酶活性（BGH）、磷酸二酯酶活性（PDE）以及堆肥的最终水分含量有显著影响。C/N对最终C/N、DGH、BGH和GI具有统计学意义。研究结果为优化城市固体废弃物堆肥系统提供了指导，该系统将提高分解速率，并生产出更稳定、更成熟的堆肥。
