The effect of limited aeration on swine manure phosphorus removal.
Two low level aeration schemes (intermittent vs. continuous) were investigated on a laboratory scale, in conjunction with swine manure pH adjustment using sodium hydroxide (1.0 M), for manure phosphorus (P) removal. According to the data, an 80% reduction in soluble P was observed when the manure pH was increased to 8. Both intermittent and continuous aeration treatments could raise manure pH above 8 with an airflow rate of 1 L/minute in a period of 15 days. A drastic increase in pH (about 1 unit) was observed for both aeration schemes within the first day of test, resulting in a 76% reduction in soluble P concentration in the liquid. It appeared that there is no difference in terms of P removal between the two aeration programs, suggesting that the intermittent aeration be preferred to save energy while still achieving the same level of P removal.
Zhu
J
J
University of Minnesota, Biosystems & Agricultural Engineering Department, Southern Research and Outreach Center, Waseca 56093, USA. zhuxx034@umn.edu
Luo
A
A
Ndegwa
P M
PM
D000388:Air; D000818:Animals; D019149:Bioreactors; D004867:Equipment Design; D006863:Hydrogen-Ion Concentration; D008372:Manure / Q000032:analysis*; D010084:Oxidation-Reduction; D010101:Oxygen Consumption; D010758:Phosphorus / Q000302:isolation & purification*; D012972:Sodium Hydroxide / Q000494:pharmacology; D013552:Swine; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification
D008372:Manure; D010758:Phosphorus; D012972:Sodium Hydroxide