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United States Department of Agriculture

Agricultural Research Service

Research Project: INNOVATIVE BIORESOURCE MANAGEMENT TECHNOLOGIES FOR ENHANCED ENVIRONMENTAL QUALITY AND VALUE OPTIMIZATION

Location: Coastal Plain Soil, Water and Plant Conservation Research

Title: Process for recovery of calcium phosphates from solid manure

Authors
item SZOGI, ARIEL
item VANOTTI, MATIAS
item HUNT, PATRICK

Submitted to: Agronomy Society of America, Crop Science Society of America, Soil Science Society of America Meeting
Publication Type: Abstract Only
Publication Acceptance Date: May 3, 2012
Publication Date: N/A

Technical Abstract: Land application of manure in regions with intense confined livestock and poultry production is an environmental concern when land is limiting because it promotes soil phosphorus (P) surplus and potential pollution of water resources. Although manure can be moved off the farm, its transportation becomes less economical with increasing distances from the farm. Thus, management alternatives to land application are needed to recycle manure P. A treatment process, called “quick wash,” was developed for extraction and recovery of P from poultry litter and animal manure solids. In the quick wash process, P is selectively extracted from solid manure or poultry litter by using mineral or organic acid solutions. Following, P is recovered by addition of liquid lime and an organic poly-electrolyte to the liquid extract to form a calcium-containing P precipitate. The quick wash process generates two products: 1) washed solid residue, and 2) concentrated recovered P material. The washed solid residue has a more balanced nitrogen to phosphorusP (N:P) ratio that is more environmentally safe for land application. The use of recovered P can provide a recycled P source for use as crop fertilizer while minimizing manure P losses into the environment from confined animal production.

Last Modified: 9/10/2014