2.2. Characteristics of swine wastewater
Several parameters in a livestock farm influence the characteristics
of swine wastewater. For instance, dilution, storage, and separation
in a livestock farm significantly affect the concentrations of
organic matter and nutrient [20,21]. Andreadakis [20] stated that
swine wastewater is solid waste that has some liquid, while
municipal or industrial wastewater is usually liquid waste that
has some solids. Total solids (TS) of swine excretion are approximately
10% and are usually diluted with urine. This implies that
swine wastewater should be sampled at a livestock WWTP to
obtain a representative sample. The swine wastewater investigated
in this study was collected from a livestock WWTP located at
Gongju, Korea. The collected sample was stored at 4 C until use.
The characteristics of swine wastewater investigated in this study
are shown in Table 1.