Nutrient recovery is a research area focused on developing technologies and methods to recover and reuse valuable nutrients from waste streams, such as wastewater, agricultural runoff, and food waste. This process helps to reduce nutrient pollution and can provide valuable resources for agriculture, industry, and other applications. Nutrient recovery methods may involve technologies such as anaerobic digestion, biofiltration, and struvite precipitation, among others. This research area plays a critical role in promoting sustainability and circular economy practices by closing the nutrient loop and reducing reliance on finite natural resources.