Abstract

D. S. Perwitasari^1,3, S. Muryanto², J. Jamari³ and A. P. Bayuseno^3,2

DOI : http://dx.doi.org/10.13005/ojc/340136

In this study, the recovery of heavy metal (Cu²⁺, Pb²⁺, and Zn²⁺) concentrations and the yield of struvite from MAP precipitation in the wastewater were optimized by SRM (surface response methodology). Struvite was a major mineral precipitated with an impurity of sylvite (KCl) as confirmed by the XRPD Rietveld method, and struvite crystal has a prism-like shape morphology according to the SEM/EDX analysis. The SRM estimates that the concentration of Pb²⁺ has a significant effect of retarding the yield of the struvite mass, while insignificant effects were related to the Cu²⁺ and Zn²⁺concentration. The optimum yield of struvite was reached at 8.342 mg, of which 59.4564 ppm of Cu²⁺; 70.7930 ppm of Pb²⁺ and 77.2114 ppm of Zn²⁺ could be recovered from wastewater. These optimized conditions could be valuable input data for engineering-design software in an equipment of the effluent treatment plant.

MAP Precipitation; Struvite; Surface Response Methodology (SRM); Heavy Metals; Wastewater Treatment

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