东非维多利亚湖畔城市基苏木(肯尼亚)的食物磷足迹情景分析

Foods Pub Date : 2024-07-16 DOI:10.3390/foods13142225
Zheng Guo, Sophia Shuang Chen, G. Kattel, Wenyi Qiao, Linglong Lu, Rong Li, Anna Charles Mkumbo
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摘要

粮食生产和消费模式的增加导致城市食物磷足迹增加,在全球范围内引发了一系列资源和环境问题。我们利用物质流分析法量化了非洲城市基苏木的食物磷足迹。我们的目的是制定基苏木的可持续磷管理框架,以减少该市食物系统中的磷损失。我们的研究结果表明,2023 年,基苏木食品系统中食品磷的进出口量分别为 2730.26 ± 2.7% 吨 P yr-1 和 3297.05 ± 2.4% 吨 P yr-1。基苏木食物系统的食物磷缺口为-566.79 ± -18%吨 P yr-1。作物种植子系统径流/淋溶/侵蚀损失、家庭消费子系统废物损失和坑厕子系统黑水损失是磷流失到环境中的主要途径,也是造成该市食物磷足迹的主要因素。2030 年的情景分析表明,在从磷输入到废物处置的整个生命周期过程中实施综合情景方案是减少磷损失、抑制未来食物磷足迹增长的最佳选择。我们的研究表明,到 2023 年,基苏木食品系统中的食物磷足迹为 0.67 千克 P cap-1yr-1,仍处于较低水平,但随着城市社会经济发展的改善,可能会进入持续上升趋势。在此框架下,我们提出了一些基本措施,包括尿液分离、安装化粪池、调整膳食结构、灵活布局卫生处理设施、分离有机废物流等,以减少基苏木的食物磷足迹。鉴于维多利亚湖沿岸城市的相似性,我们的计算方法和管理策略可适用于该地区的其他城市。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Scenario Analysis of Food Phosphorus Footprint in Kisumu, a Lakeside East African City in Lake Victoria (Kenya)
Increased food production and consumption patterns have resulted in higher urban food phosphorus footprints, leading to a series of resource and environmental problems worldwide. We quantified the food phosphorus footprint of the African city of Kisumu using substance flow analysis. Our aim was to develop Kisumu’s sustainable phosphorus management framework so that the city would reduce phosphorus losses into the food system. Our results show that in the year 2023, the import and export of food phosphorus in the Kisumu food system was 2730.26 ± 2.7% t P yr−1 and 3297.05 ± 2.4% t P yr−1, respectively. There was −566.79 ± −18% t P yr−1 food phosphorus deficit in the Kisumu food system. Crop planting subsystem runoff/leaching/erosion loss, household consumption subsystem waste loss, and pit latrine subsystem blackwater loss are the major pathways of phosphorus losses into the environment and the main contributors to the food phosphorus footprint in the city. The 2030 scenario analysis shows that implementing a comprehensive scenario scheme throughout the entire lifecycle process from phosphorus input to waste disposal is the best choice for reducing phosphorus losses and suppressing the growth of food phosphorus footprint in the future. Our study shows that the food phosphorus footprint in the Kisumu food system was 0.67 kg P cap−1yr−1 in 2023, which is still at a low level but may enter a continuous upward trend with the improvement of socio-economic development of the city. In our framework, we have proposed a few essential measures that include urine separation, installation of septic tank, adjustment of dietary structure, flexible layout of sanitary disposal facilities, and separation of organic waste streams to reduce food phosphorus footprints in Kisumu. Given the similarity of cities along the shores of Lake Victoria, our calculation methods and management strategies can be applied to other cities in the region.
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