Department of Civil & Environmental Engineering, University of California, Berkeley, CA 94720, United States; National Science Foundation Engineering Research Center for Re-inventing the Nation's Urban Water Infrastructure, Berkeley, CA 94720, United States.
Energy Analysis & Environmental Impacts Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States.
Water Res. 2021 Nov 1;206:117717. doi: 10.1016/j.watres.2021.117717. Epub 2021 Sep 30.
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.
将有机废物从垃圾填埋场转移出去，为回收有价值的营养物质（如氮和磷）提供了机会，这些营养物质通常会被丢弃。尽管先前的研究已经探索了构建厌氧消化（AD）基础设施来处理有机废物并产生能源的潜力，但需要更好地了解从这些废物流的 AD 产生的固体和液体副产物（消化物）中回收营养物质的潜力。我们通过将现有的 AD 设施与现有的营养回收技术相结合，量化了加利福尼亚州通过集成当前和未来的 AD 设施可以潜在回收的营养物质的系统范围的质量。根据 AD 的有利可图的建设方案，从城市污水污泥中回收氮和磷的潜力最大。对于三种不同的组合有机废物流的最终产品，确定了营养物质的回收（总质量的%）：液体肥料[总氮 (TN) 的 38%]、鸟粪石[TN 50%，TP 66%]和堆肥[TN 12%，TP 34%]。根据加利福尼亚州 AD 设施有利可图的建设方案，回收的营养物质将抵消估计 11%的州内合成肥料需求的 TN 和 29%的 TP，而如果所有技术上可回收的生物质都被收集和处理，则可以抵消 44%的 TN 和 97%的 TP 需求。
