Synthesis of Struvite Crystal (MgNH4PO4.6H2O) from Laundry Waste to Consider its Potential as a Plant Fertilizer: Stirring and Processing Temperature Effect

This paper aimed to process phosphate from laundry waste be struvite crystal by precipitation and crystallization methods. In general, phosphates are difficult remove conventional treatment technologies. Therefore, methods can an alternative choice for recovery. Precipitation adding KOH serve dissolved content in wastewater, as well convert it into a solid form that reused industrial raw materials. The research variables used were stirring temperature (25, 30, 35 C) speed (100, 125, 150, 200 rpm). By using X-ray Fluorescence (XRF) Scanning Electron Microscope (SEM-EDX), the analysis showed highest percentage of removal was at 100 rpm 30°C, which 47.5%. Diffraction (XRD) also carried out on several samples confirmed dominant phase formed (MgNH4PO4.6H2O) all samples, secondary magnesium hydrate (Mg3(PO4)2.8H2O found 30°C. morphology crystals resembles irregular flakes SEM.