关闭循环:对废水衍生肥料满足美国农业需求潜力的空间分析
Minhazul Islam1, Arghajeet Saha2, Rebecca Muenich3
1School of Sustainable Engineering & the Built Environment, Arizona State University, Tempe, AZ, 85287, USA.
The Science of the total environment
|November 11, 2025
概括
循环经济对于可持续性至关重要. 一项对美国废水处理厂的研究表明,大型设施产生了大多数污水,但物流方面的挑战阻碍了需要肥料的农业地区的当地再利用.
科学领域:
- 环境科学 环境科学
- 资源管理 资源管理
- 化学工程是化学工程的重要组成部分.
背景情况:
- (P) 是一个有限的资源,对农业和人类生活至关重要.
- 可持续的管理需要循环经济.
- 识别空间P流和重复使用潜力是一个基本步骤.
研究的目的:
- 为连接美国的废水处理厂 (WWTP) 制定一个全面的预算.
- 确定污水衍生P可以满足当地农业肥料需求的地点.
- 分析WWTP的P供应与农业需求之间的空间不匹配.
主要方法:
- 对约17000个市政水电站进行了全面的预算分析.
- 计算了使用比率 (P使用比率) = 废水 P / 商业化肥 P.
- 分析的P流,包括土地应用,填埋和焚烧.
主要成果:
- 200个最大的WWTP占污水总P的近50% (0.30万/年).
- 城市县通常具有P使用比率>1.0,超过了当地肥料需求.
- 农村农业地区,特别是中西部地区,使用率<0.25,表明肥料需求很高.
结论:
- 污水产生的P与农业的P需求之间存在显著的空间不匹配.
- 虽然一些P已经通过土地应用重新使用,但物流挑战阻碍了完全循环经济.
- 协调策略对于最大限度地提高P恢复和弥合空间断开是必不可少的.
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