CHARACTERISTICS OF PHOTOTROPHIC AND NON--PHOTOTROPHIC LAGOONS FOR SWINE MANURE

摘要: Odors are a major result of inadequately sized and mismanaged anaerobic lagoons. However, purple or pink colored lagoons, indicating the presence phototrophic bacteria, less likely to be an odor nuisance than non-purple Eight swine lagoons were studied quantify critical parameters thought allow more reliable control alternative. Bacteriochlorophyll (Bchl a), which indirectly measures abundance was greater in (P = 0.01). Oxidation-reduction potential (ORP) negative for both spring (lagoon temperatures 6.7C 8.8C) during summer (temperatures 22C 25C), conditions favoring phototrophism 0.04). Dissolved oxygen levels near zero light penetration minimal all Average sulfide concentrations range 1.6 6.5 mg/L, is below preferred sulfur bacteria (PSB) growth. Purple appeared have lower ammonia, alkalinity, chemical demand, electrical conductivity among studied. Copper zinc not considered toxic bacteria. Calculated volatile solids loading rates did explain differences Bchl