Abstract：
The increase in food waste generation has resulted in significant challenges for its sustainable management. Anaerobic digestion coupled with microalgae-based ponds for digestate treatment can be used as a low-cost eco-friendly technology approach. In this case, microalgal biomass harvested from the ponds may be valorized into bioenergy (biogas) and soil conditioner and/or biofertilizers. The aim of the present study was to evaluate the microalgal biomass produced from a food waste digestate treatment ponds as agricultural fertilizer. For this purpose, microalgal biomass was tested before and after anaerobic digestion and co-digestion with food waste, exploring its potential for valorization. The inorganic fertilizer urea and soil with no fertilization were also used as treatments. The experimental design consisted of applying the treatments in pots cultivated with hybrid grass Brachiaria cv. Sabiá and distributed in randomized blocks in a controlled greenhouse. Microalgal biomass was mainly composed by Scenedesmus sp.. The assessed parameters showed comparable results on plant growth (i.e. number of tillers, fresh and dry matter and Chlorophyll content index) for fresh and digested microalgal biomass and inorganic fertilizer. Furthermore, it was observed that fresh microalgae provided the highest Phosphorus content in the leaf (21 %). Additionally, there were increases of 9 % in Nitrogen and 12 % in organic matter in the soil after applying digested microalgae compared to the control group without any fertilization. Finally, experimental data obtained suggests that microalgae-based biofertilizer holds the potential to replace inorganic fertilizer as a nutrient source. Moreover, it contributes to the valorization of by-products from organic waste treatment.
摘要：
食物垃圾产生量的增加给其可持续管理带来了重大挑战。厌氧消化与基于微藻的池塘进行消化处理可用作低成本的生态友好技术方法。在这种情况下,从池塘收获的微藻生物质可以被有价值地转化为生物能源(沼气)和土壤调节剂和/或生物肥料。本研究的目的是评估从食物垃圾消化处理池作为农业肥料产生的微藻生物质。为此,在厌氧消化和与食物垃圾共消化之前和之后测试微藻生物量，探索其增值潜力。还使用无机肥料尿素和未施肥的土壤作为处理。实验设计包括在用杂交草Brachiariacv栽培的盆栽中应用处理。Sabiá并在受控温室中随机分布。微藻生物量主要由栅藻组成。.评估的参数在植物生长方面显示出可比的结果（即，分till数，新鲜和干物质和叶绿素含量指数），用于新鲜和消化的微藻生物量和无机肥料。此外，观察到新鲜微藻在叶片中提供最高的磷含量(21%)。此外,与未施肥的对照组相比，施用消化的微藻后，土壤中的氮增加了9％，有机质增加了12％。最后,获得的实验数据表明，基于微藻的生物肥料具有替代无机肥料作为营养来源的潜力。此外，它有助于有机废物处理副产物的增值。
