Extracting high-value nutrients from agri-wastes: Impact on struvite production and pathogen reduction**

在环境中处理未经处理的家禽粪便（PM）的潜在影响是加拿大农业的主要挑战之一，考虑到这种农业废物的大量。厌氧消化（AD）等处理技术可以在PM管理中发挥重要作用，通过解决特定问题，如气味、病原体、水污染、温室气体排放以及一定程度的土壤磷和重金属污染，提供土地应用的替代方案。由于PM中总固溶体（TS）含量高、氨含量高，对产甲烷古菌有抑制作用，该方法尚未工业化。尽管AD过程是有效的，但从PM中消化的物质仍然会含有有机物和过量的营养物质，这些有机物和营养物质可能导致氨排放，地下水污染或雨水径流导致湖泊富营养化。****从营养丰富的PM废弃物中回收氮、磷等营养物质可以解决上述问题。它不仅为解决高氨含量问题提供了一个有前途的经济有效的选择，而且为商业肥料提供了另一种选择。由于商业肥料主要是从有限和不可再生的磷岩储备中生产的，预计它们将变得更加稀缺和昂贵。可行的替代方案应能降低农场规模上的肥料成本。将养分回收系统整合到AD处理方案中，可以在减少养分和其他污染负荷进入土地、地下水或湖泊，同时生产适合可持续种植和粮食生产的肥料方面发挥关键作用。然而，为了确定这两个过程的可行性，需要进行关键的研究，鸟粪石的营养成分，病原体的存活和消化材料中微生物耐药性的存在，这是该计划的主要里程碑。该项目的成果将有利于加拿大农业部门****

The potential impact of disposing untreated poultry manure (PM) in the environment is one of the Canada agriculture's major challenges considering high volume of this agri-waste. Treatment technologies such as anaerobic digestion (AD) can play an important role in the management of PM by providing an alternative to land application through solving specific problems such as odors, pathogens, water pollution, GHG emissions, and phosphorus and heavy metal contamination of soils to some magnitude. This method has not been industrialized yet due to the problems such as high amounts of total solid (TS) and high content of ammonia in PM which result in inhibition of methanogenic archaea. Despite the effectiveness of AD process, digested materials from PM will still contain organics and excess nutrients that could lead to ammonia emissions, groundwater pollution or eutrophication of lakes as a result of rainwater runoff. ****Recovering nutrients, such as nitrogen and phosphorus, from nutrient-rich PM wastes could solve the above problem. It provides a promising cost-effective option not only for tackling high ammonia content issue but also provides an alternative for commercial fertilizers. As commercial fertilizers are primarily produced from finite and non-renewable phosphorus rock reserves, they are expected to become more scarce and expensive. Viable alternatives should reduce the fertilizer costs at the farm scale. Integrating the nutrient recovery system into the AD treatment scheme could play a key role in reducing nutrients and other pollutional load into land, ground water or lake, while producing fertilizer suitable for sustainable cultivation as well as food production. However, critical research is needed in order to determine the feasibility of both processes, nutrient content of struvite, and survival of pathogens and presence of microbial resistance in digested materials which are the main milestones of this proposed project. The outcomes of this project will benefit the Canadian agricultural sectors****