JCFR68QL

2625

7 janvier 2021 14:14

7 janvier 2021 14:14

Repeated land application of dairy manure can increase soil phosphorus above crop requirements because of manure’s low nitrogen (N) to phosphorus (P) ratio (N:P < 4:1). This soil P build-up can lead to off-site P transport and impairment of surface water quality. We evaluated a treatment process to extract P from manures, called Quick Wash, integrated with a double-stage solids separation system to recover coarse and fine manure solids. The Quick Wash process uses a combination of acid, base, and organic polymers to extract and recover P from manures, improving the N:P ratio of recovered manure solids (RMS). Results showed that coarse RMS could have use as bedding materials for dairy cows, and the fine acidified RMS with N:P > 10:1 can be used as a low-P organic soil amendment. A soil incubation test showed that acidified RMS stimulated N mineralization and nitrification having higher nitrate levels than untreated dairy slurry when incorporated into soil. Our results suggest that the inclusion of Quick Wash in a dairy manure management system can improve manure’s value, lowering costs of bedding material and manure hauling, and recover P for use as fertilizer while reducing the environmental impact of land spreading manure P.

None

• AB - Transversal
• FREDO effluents et litière
• FREDO fertilisation
• FREDO technologie et innovation
• GEO Etats-Unis
• GEO Uruguay
• mineralization
• bovin laitier
• waste
• élevage

• n:p ratio
• animal waste
• dairy waste
• manure
• manure acidification
• nitrogen
• phosphorus
• quick wash

Agronomy

10

1725

2020/11

24 novembre 2020

10.3390/agronomy10111725 Le DOI est une URL unique de référencement d'une publication. Il est donc plus fiable et permanent qu'une URL classique