Struvite: Recovering nutrients from the digestate and reducing emissions from storage and soil application

STRUVITE operational Group designed and implemented a prototype, a farmscale system, capable of recovering struvite from agricultural digestate. The nitrogen emissions (sum of Nammonia and N-nitrous oxide) generated from the application of the treated digestate to the soil were reduced by 19% for the treated supernatant fraction due to depleted content of N. Application of the recovered struvite reduced by 63% for the precipitated fraction, even if rich in nitrogen and phosphorus, thanks to their presence in saline form.