Figure 3 shows the changes in colour and PO3−4 −Pduring the experimental period. The colour of the influentwas stable at approximately 500 units and decreasedto a minimum of approximately 100 units with treatment.The increase of effluent colour after approximately 20 dayscould be because of the gradual drop of CSH additionrate (Figure 2). The PO3−4 −P of the influent fluctuatedbetween 40 and 150 mg/L and decreased to <20 mg/L withtreatment throughout the experimental period.
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