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United States Department of Agriculture

Agricultural Research Service

Title: Nutrient Separation from Liquid Manure Using Pam

Authors
item Vanotti, Matias
item Hunt, Patrick
item Rashash, D.M.C. - NC STATE UNIV.

Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: June 30, 1999
Publication Date: N/A

Technical Abstract: Most of the organic nutrients in liquid swine manure are contained in fine suspended particles not separated by mechanical separators. Treatment with polyacrylamide (PAM) has the potential for enhancing solids-liquid separation, thus concentrating nutrients and organic C. In this work we evaluated solids and nutrient removal from flushed swine manure using PAM and screening. The project was conducted at a 14,400 head feeder-to-finish operation in Bladen Co., N.C. Trials were done every other week during a complete growing cycle (16 wk). The flushed manure contained 110 to 590 mg/L of P, and 890 to 2440 mg/L of N; approximately 85% of P and 45% of N were organic. PAM treatment significantly increased capture of organic nutrients by screening: PAM rates of 60 to 100 mg/L provided efficiencies >90% for both suspended solids and organic P and N, vs. <15% for a control (no PAM). The technology provides an attractive alternative to existing manure handling methods for conserving nutrients and avoiding excessive nutrient application in areas where swine production is concentrated.

Last Modified: 8/22/2014