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ARS Home » Southeast Area » Florence, South Carolina » Coastal Plain Soil, Water and Plant Conservation Research » Research » Publications at this Location » Publication #390112
Research Project: Innovative Manure Treatment Technologies and Enhanced Soil Health for Agricultural Systems of the Southeastern Coastal Plain

Location: Coastal Plain Soil, Water and Plant Conservation Research

Title: Recovery of phosphorus by the quick wash process: agronomic evaluation

Author
item TAKATA, VIRGINIA - Universidad De La República
item Szogi, Ariel
item PINO, AMABELIA DEL - Universidad De La República

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 2/20/2022
Publication Date: 7/31/2022
Citation: Takata, V.H., Szogi, A.A., Pino, A. 2022. Recovery of phosphorus by the quick wash process: agronomic evaluation. Meeting Abstract.

Interpretive Summary: Abstract Only.

Technical Abstract: The Quick Wash (QW) process was used to reduce the phosphorus (P) content of agro-industrial wastes and their potential environmental impact due to their land disposal. The QW consisted of three steps: 1) liquid extraction of P using mineral acid (H2SO4) with separation of a washed-solids byproduct; 2) P precipitation from the liquid extract under alkaline pH; and 3) enhanced P recovery as concentrated calcium phosphate (Ca-P) using an anionic polymer. The concentrated Ca-P can be used as a fertilizer and a more economical manner to transport P away from animal production sites. The objective was to evaluate the P extraction using the QW process from manure and the agronomic value of recovered Ca-P precipitates and washed solids as soil amendments. Three animal wastes were used: dairy, feedlot, and poultry manure. The mineralization of the different Ca-P precipitates and the respective washed solids applied to two sandy soils were evaluated under controlled laboratory conditions. We found that 72% of total P in dairy manure, 90% in feedlot manure and 38% in poultry manure was recovered as Ca-P with the QW. The recovered Ca-P and washed manure solids materials released different amounts of P in the two types of soils used in this study. In both soils treated with the washed solids or the P precipitates, plant available P was higher than in the soil control. Therefore, the QW process is applicable to recover P from animal wastes and the concentrated P product can be used as a fertilizer material.