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流需要进行处理，以防止对环境产生负面影响，如藻类大量繁殖和气候变化。大量的含氮废物在厌氧消化装置中进行处理，产生沼气和含铵废水，随后转化为二氮或硫酸铵肥料。目前办法的主要缺点是最终产品价值低，而且依赖转换所需的危险化学品。此外，由于高硫含量对某些土壤性能有害，在一些城市限制使用硫酸铵作为肥料。本发明提供了一种用于电化学合成具有低硫含量至无硫含量的氮肥（具体地，含硫和含磷的硝酸铵）并结合氢气或合成气生产的方法和系统。这种方法能够将浓氨溶液可持续地转化为高价值的肥料，具有高电流效率和优异的氨去除效率（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%).