Evaluation of Electrochemical process on Polyphosphate Removal from the Aqueous Solution

Aims The effect of electrochemical process on polyphosphate alone has not been yetinvestigated. The aim of this study was to study polyphosphate removal from syntheticwastewater by electrochemical process.Materials & Methods This research was carried out experimentally on 50 samples ofsynthetic wastewater. In each run 2000ml of SW took place in a batch. A constant 600mAdirect current was applied on the batch content through steel electrodes. First syntheticwastewater samples with initial concentrations in the range of 2-16mgL-1-P were examinedand one sample was taken every 2min during 12min. Then samples in the range of 2 to32mgL-1-P were tested and one sample was taken every 10min during 1 hour. Residualphosphorous in taken samples was measured according to Standard Methods book.Findings The removal efficiency was 85-99.85%. Residual phosphorous concentrationwas reduced below 1mgL-1-P (Iranian standard) in 1.15mA/cm2 DC. The needed reactiontime was 10min. for 2-16mgL-1-P initial concentration whereas at higher concentrationsit was 30min. Also, the reaction was first order with respect to the residual phosphorousconcentration.Conclusion This process is efficient for removal of the over 99% of poly phosphate fromthe wastewater and able to reduce the residual phosphorous in effluent to less than Iranianstandard limits for reuse (≤1mgL-1).

Keywords:

Electrochemical Techniques , Polyphosphates , Waste Water