Diversion of organic waste from landfills offers an opportunity to recover valuable nutrients such as nitrogen and phosphorus that are typically discarded. Although prior research has explored the potential for buildout of anaerobic digestion (AD) infrastructure to treat organic waste and generate energy, a better understanding is needed of the nutrient recovery potential from the solid and liquid byproducts (digestate) resulting from AD of these waste streams. We quantified the system-wide mass of nutrients that can potentially be recovered in California by integrating current and potential future AD facilities with existing nutrient recovery technologies. Based on a profitable build-out scenario for AD, the potential for nitrogen and phosphorus recovery by mass was greatest from municipal sewage sludge. The nutrient recovery (% total mass) was determined for three different end products for the combined organic waste streams: liquid fertilizer [38% of the total recovered nitrogen (TN)], struvite [50% TN, 66% total phosphorous (TP)], and compost (12% TN, 34% TP). Based on the profitable build-out scenario of AD facilities in California, the recovered nutrients would offset an estimated 11% of TN and 29% of TP of in-state synthetic fertilizer demand, whereas a scenario in which all technically recoverable biomass is collected and treated could offset 44% of TN and 97% of TP demand.

从垃圾填埋场转移有机废物为回收通常被丢弃的氮和磷等有价值的营养物质提供了机会。尽管先前的研究已经探索了建立厌氧消化 (AD) 基础设施以处理有机废物和产生能量的潜力，但需要更好地了解这些废物流的厌氧消化产生的固体和液体副产品（消化物）的养分回收潜力. 我们通过将当前和未来潜在的 AD 设施与现有的养分回收技术相结合，量化了加利福尼亚州可能回收的全系统养分质量。基于 AD 的有利可图的扩建方案，从城市污水污泥中按质量回收氮和磷的潜力最大。确定组合有机废物流的三种不同最终产品的养分回收率（% 总质量）：液体肥料 [总回收氮 (TN) 的 38%]、鸟粪石 [50% TN，66% 总磷 (TP) ] 和堆肥（12% TN，34% TP）。根据加利福尼亚州 AD 设施的盈利性扩建方案，回收的养分将抵消州内合成肥料需求的估计 TN 的 11% 和 TP 的 29%，而在所有技术上可回收的生物质被收集和处理可以抵消 44% 的 TN 和 97% 的 TP 需求。