Phosphorus retention in anaerobic u

Phosphorus retention in anaerobic units occurs mainly because of the settling
of inorganic phosphate compounds under anaerobic conditions.
Additionally, a high concentration of iron ions that are present in
this region could contribute to the formation of these compounds.
However, the greatest nutrient removal efficiency was observed in
the duckweed ponds, which is discussed in the following sections.
A wide variation in the raw manure composition was found
throughout the studied period.
This range is primarily caused by the management and hog production cycle,
such as the number and age of animals, diet composition and quantity of water used,
but this was expected.
This variation in raw waste composition can be seen in Table 3, as the high standard deviation from the median.
Nevertheless, high treatment efficiency was observed through the stages of the system