Assessing the efficacy of chemically-enhanced solid-liquid separation for management of hog manure

Project: MLMMI 2009-15


Specific objectives are to:

  1. determine the settling velocity of solids and phosphorus from liquid hog manure;
  2. evaluate the efficacy of metal salts and a cationic polymer in improving solids and phosphorus removal from liquid manure of varying solids content;
  3. determine the extent of solids and phosphorus removal under varying treatment combinations;
  4. quantify the partitioning of phosphorus, nitrogen and metal cations in the separated solids vs. the liquid fraction;
  5. determine the effect of amendments (flocculants) on nutrient balance in the separated solids and liquid fractions; and
  6. provide data necessary to establish a full-scale solid-liquid separation system for adoption by Manitoba’s hog producers.

Keywords: flocculant, hog manure, metal salts, sedimentation, phosphorus, solid-liquid separation, suspended solids


Dr. Francis Zvomuya, University of Manitoba (Project Leader)
Dr. Wole (Olalekan) Akinremi, University of Manitoba


Dr. Geza Racz, University of Manitoba
Gary Plohman, Manitoba Agriculture, Food and Rural Initiatives


Status: Completed
Started: 2010-06-01
Completed: 2014-09-30

Funding Partners: who have contributed to MLMMI in support of this project:
Manitoba Pork Council - $33,675
TBA - $33,675

Amount Funded: $67,350.00
Performer Funded: $0.00
Total Cost: $67,350.00


Progress report #1 due December 1, 2010.
Received January 20, 2011.
Progress report #2 due June 1, 2011.
Progress report #3 due December 1, 2011.
Final report due June 1, 2012.


This project adapted gravity-based solid-liquid separation through the addition of various chemical amendments. In addition to the final project report, the researchers provided a brief summary that addresses some of the questions producers may have in assessing whether or not chemical amendments can benefit gravitational settling.


Progress Report #1 - December 2010
Producer FAQ
Final Report

Manitoba Pork represents 614 Manitoba hog farms