Market Assessment for Electrochemical Method and System for Preparation of Ammonium Nitrate-based Fertilizers from Ammonia Waste

来自人类活动的富氨废物需要进行处理，以防止对环境的负面影响，如藻类水华和气候变化。大量含氮废物在厌氧消化厂内进行处理，以产生沼气和含铵废水，然后将其转化为氮肥或硫酸铵肥料。目前方法的主要缺点是最终产品的价值较低，并依赖于转换所需的危险化学品。此外，由于硫磺含量高，不利于某些土壤性能，因此在一些市政当局限制使用硫铵作为肥料。本发明提供了一种用于电化学合成低硫或无硫氮肥(具体地说，含硫和含磷的硝酸铵)与氢气或合成气生产相结合的方法和系统。这种方法可持续地将浓氨溶液转化为高价值的肥料，具有高电流效率和出色的脱氨效率(高达98%)。

Ammonia-enriched waste streams originating from human activities require being treated to prevent negative effects on the environment, such as algae blooms and climate change. Large amounts of nitrogen-containing waste are treated within anaerobic digestion plants to produce biogas and ammonium laden wastewater that is subsequently converted into dinitrogen or ammonium sulphate fertilizer. The main disadvantages of the current approach are low value of the final products and the reliance on hazardous chemicals required for the conversion. Moreover, the use of ammonium sulphate as a fertilizer is restricted in some municipalities due to a high sulphur content detrimental to certain soil performance. The present invention represents a method and system for electrochemical synthesis of nitrogen fertilizers with low to no sulphur content (specifically, sulphur- and phosphorus-containing ammonium nitrate) coupled with hydrogen or syngas production. This method enables sustainable conversion of concentrated ammonia solutions into high-value fertilizers with high current efficiency and excellent ammonia removal efficiency (up to 98%).