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，考虑到大量的农业废物。厌氧消化（AD）等处理技术可以在PM管理中发挥重要作用，通过在一定程度上解决诸如气味、病原体、水污染、GHG排放以及土壤的磷和重金属污染等具体问题，提供土地应用的替代方案。由于PM中总固形物（TS）含量高、氨含量高等问题，导致产甲烷古菌受到抑制，该方法尚未实现工业化。尽管AD工艺有效，但PM中的消化物仍将含有有机物和过量营养物质，这些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废物中回收营养物质，如氮和磷，可以解决上述问题。它不仅为解决高氨含量问题提供了一种有前途的具有成本效益的选择，而且还为商业肥料提供了替代品。由于商业肥料主要是从有限和不可再生的磷矿石储备中生产的，预计它们将变得更加稀缺和昂贵。可行的替代品应能降低农场规模的化肥成本。将营养物回收系统纳入AD处理方案可以在减少营养物和其他污染物进入土地，地下水或湖泊方面发挥关键作用，同时生产适合可持续种植和粮食生产的肥料。然而，关键的研究是必要的，以确定这两个过程的可行性，鸟粪石的营养含量，和病原体的生存和微生物的耐药性存在的消化材料，这是这个拟议的项目的主要里程碑。该项目的成果将使加拿大农业部门受益 *

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****