As shown in Fig. 9 the batch test under aerobic condition
was carried out by using a sludge sample from thickener
tank and dosing synthetic phosphorus was added at 30 mg/l
concentration using NaH2PO4H2O at a duration time of
60 min.
The TP concentration in bulk liquid was 25 mg/l at
the start of the test, and then the TP value started to decrease
gradually to become 1.88 mg/l at the end.