Flow back wastewater after the sludge treatment process was
collected as a wastewater sample for the experiment. Since the flow
back wastewater was generated by squeezing the spent sludge to
obtain solid sludge for disposal, the water contains the high concentrations
of many elements including phosphorus. Therefore,
removal of phosphorus in this type of wastewater can lead to the
reduction of phosphorus in the whole wastewater treatment system.
The flow back wastewater was collected in a plastic bottle
from the pipe connected to the sludge treatment process at the
wastewater treatment plant in Suwon, South Korea. The samples
were sealed and kept at 4 C to maintain the condition of the
samples.