Systems which flush milking parlors and feeding lanes usually collect wastewater in lagoons and periodically pump from the last stage lagoon onto nearby forage fields.
Many dairies have one or two lagoons, while a few have three or four in series.
Alum flocculates organic matter and reacts with orthophosphate to form water-insoluble aluminum phosphate. O L -1 was added to 0.5 L wastewater in beakers. Alum solution was injected by pipette and mixed 1 min by using a magnetic plate with stir bar set at 400 rpm. Solids were determined before and after treatment. Total P and DRP values were log e transformed to increase homogeneity and additivity of the effects.