Opatokun Suraj Adebayo, Yousef Lina F, Strezov Vladimir
Department of Environmental Sciences, Faculty of Science, Macquarie University, NSW 2109, Australia.
Department of Chemical and Environmental Engineering, Masdar Institute of Science and Technology, Abu Dhabi, P.O. Box 54224, United Arab Emirates.
J Environ Manage. 2017 Feb 1;187:24-30. doi: 10.1016/j.jenvman.2016.11.030. Epub 2016 Nov 18.
The digestate (DFW) of an industrial food waste treatment plant was pyrolysed for production of biochar for its direct application as bio-fertilizer or soil enhancer. Nutrient dynamics and agronomic viability of the pyrolysed food waste digestate (PyD) produced at different temperatures were evaluated using germination index (GI), water retention/availability and mineral sorption as indicators when applied on arid soil. The pyrolysis was found to enrich P, K and other micronutrients in the biochar at an average enrichment factor of 0.87. All PyD produced at different temperatures indicated significantly low phytotoxicity with GI range of 106-168% and an average water retention capacity of 40.2%. Differential thermogravimetric (DTG) thermographs delineated the stability of the food waste digestate pyrolysed at 500 °C (PyD500) against the degradation of the digestate food waste despite the latter poor nutrient sorption potential. Plant available water in soil is 40% when treated with 100 g of digestate per kg soil, whereas PyD500 treated soil indicated minimal effect on plant available water, even with high application rates. However, the positive effects of PyD on GI and the observed enrichment in plant macro and micronutrients suggest potential agronomic benefits for PyD use, in addition to the benefits from energy production from DFW during the pyrolysis process.
一家工业食品废弃物处理厂的沼渣（DFW）经过热解以生产生物炭，用于直接作为生物肥料或土壤改良剂。以发芽指数（GI）、保水/持水能力和矿物质吸附为指标，评估了在不同温度下生产的热解食品废弃物沼渣（PyD）施用于干旱土壤时的养分动态和农艺可行性。研究发现，热解过程使生物炭中的磷、钾和其他微量养分得到富集，平均富集系数为0.87。在不同温度下生产的所有PyD均显示出极低的植物毒性，GI范围为106%-168%，平均保水能力为40.2%。差示热重（DTG）热重曲线描绘了500℃热解的食品废弃物沼渣（PyD500）相对于未热解沼渣的稳定性，尽管未热解沼渣的养分吸附潜力较差。当每千克土壤施用100克沼渣时，土壤中的植物有效水含量为40%，而即使施用率很高，PyD500处理的土壤对植物有效水的影响也最小。然而，PyD对GI的积极影响以及观察到的植物大量和微量养分的富集表明，除了热解过程中DFW产生能源带来的益处外，PyD的使用还具有潜在的农艺效益。
