Department of Civil Engineering, Federal University of Viçosa, Av. Peter Henry Rolfs, s/n, Campus da Universidade Federal de Viçosa, Viçosa, Minas Gerais 36570-900, Brazil.
Department of Civil Engineering, Federal University of Viçosa, Av. Peter Henry Rolfs, s/n, Campus da Universidade Federal de Viçosa, Viçosa, Minas Gerais 36570-900, Brazil.
Sci Total Environ. 2020 Jul 1;724:138138. doi: 10.1016/j.scitotenv.2020.138138. Epub 2020 Mar 23.
Waste, especially biomass in general, is a large reservoir of nutrients that can be recovered through different technologies and used to produce biofertilizers. In the present study, environmental impacts of the production of microalgae biomass-based phosphate biofertilizer compared to triple superphosphate through life-cycle assessment conducted in the Simapro® software were investigated. The functional unit of the analysis was 163 g of P for both fertilizers. Phosphorus was recovered from a meat processing industry effluent in a high-rate algal pond. Impacts related to the entire biofertilizer chain impacted mainly on climate changes (3.17 kg COeq). Microalgae biofertilizer had higher environmental impact than conventional fertilizer in all impact categories, highlighting climate change and terrestrial ecotoxicity. An ideal scenario was created considering that: all energy used comes from photovoltaic panels; in the separation step a physical method will be used, without energy expenditure (i.e. gravimetric sedimentation) and; biomass will be dried in a drying bed instead of the thermal drying. In this scenario, the impact of biofertilizer approached considerably those of triple superphosphate. When impacts of biomass cultivation and concentration stages were disregarded, drying step was of great relevance, contributing to increase biofertilizer impacts. More research is needed to optimize the algae production chain and determine the possibility of obtaining higher added value products more environmental attractive.
废物，特别是生物质，是一种含有大量养分的巨大储存库，可以通过不同的技术回收利用，用于生产生物肥料。在本研究中，通过 Simapro®软件进行生命周期评估，比较了以微藻生物质为基础的磷酸盐生物肥料与过磷酸钙的生产的环境影响。分析的功能单位为两种肥料的 163g P。磷从肉类加工工业废水中在高速藻类池塘中回收。与整个生物肥料链相关的影响主要影响气候变化（3.17kg COeq）。在所有影响类别中，微藻生物肥料的环境影响均高于传统肥料，突出了气候变化和陆地生态毒性的影响。创建了一个理想的情景，假设：所有使用的能源都来自光伏电池板；在分离步骤中，将使用物理方法，不消耗能源（即重力沉降）；并且生物质将在干燥床上干燥，而不是在热干燥中干燥。在这种情况下，生物肥料的影响与过磷酸钙的影响相当接近。当忽略生物质培养和浓缩阶段的影响时，干燥步骤非常重要，会增加生物肥料的影响。需要进一步研究以优化藻类生产链，并确定获得更具环境吸引力的更高附加值产品的可能性。
