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Figure 2(b) shows an example where a turbidity peak load resulted in neither 100% BW time nor in increased effluent turbidity. Table 1 gives the TP and SS values of influent and effluent of grab samples taken on the same day. During the peak at 14:00 h, only a slightly increased content of SS in the effluent (4.8 mg/L) could be observed. The TP removal remained at about 90% as observed before the peaks at 09:00 and 11:00 h. As the influent TP amounted to 1.2 mg/L at 14:00 h, this resulted in effluent TP values just above 100 μg/L.

Table 1

Pilot plant performance at peak load when dosing 0.11 mmol/L Al and 1.5 mg/L polymer

TimeTP [μg/L]
P removal [%]SS [mg/L]
InOutInOut
09:00 410 51 88 11.0 3.2 
11:00 490 59 88 9.4 4.2 
14:00 1,200 110 91 22.0 4.8 
TimeTP [μg/L]
P removal [%]SS [mg/L]
InOutInOut
09:00 410 51 88 11.0 3.2 
11:00 490 59 88 9.4 4.2 
14:00 1,200 110 91 22.0 4.8 

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