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Moh Moh Thant Zin,Diwakar Tiwari,DONG JIN KIM 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.86 No.-
Nitrogen (N) and phosphorus (P) removal and recovery as struvite from various waste streams havedrawn much attentions for environmentally friendly and economically competitive fertilizer production. In this study, integrated approach of using food wastewater (FW) and incinerated sewage sludge ash(ISSA) as the alternative N and P sources and optimum Mg dosage were investigated for thefirst time toachieve maximal nutrient recovery as struvite (MgNH4PO4 6H2O). Response surface methodology (RSM)successfully established the optimum condition for the maximum recovery of PO43 -P (97.7%), NH4+-N(74.8%), and Mg2+ (95.5%) as precipitate at pH 9.63 and molar ratio of PO43 -P:NH4+-N:Mg2+ of 1:0.6:1.59. The recovered precipitate mostly consists of struvite (72.6%) and shows high P-bioavailability (98.8%)with very low heavy metals content indicating a high performance fertilizer. Moreover, economicanalysis highlights that the struvite production pathway could gain $149.1/m3 of FW to move forwardsfor economical struvite production.