Sustainable improvement of fertilizer ’ s industry wastewater with CaCl 2 and Ca ( OH ) 2 treatment

Phosphate and fluoride are of commonly detected contaminants in the wastewater of fertilizer industries that produce nitro-phosphate. Chemical precipitation is the mainly responsible for remediation of TP and F-contaminated wastewater. Knowledge about the concentration of alkali and pH of TP and F removal rate is still very limited. Chemical reactions were constructed to investigate the stability of precipitates resulted from Ca3(PO4)2 and CaF2 complexes removal%. A high level of TP and F were significantly more that pH 7. Alkalis and pH were more responsive to TP amendment compared to soluble pyrophosphate. Precipitation rate for phosphate was more on pH and added alkali that Fluoride at 0.05 degree. The introduction of small amounts of CaCl2 increases these rates insignificantly decrease, resulting in a insolubility of the precipitation rates through the reaction pH. Fluoride removal rates measured down the pH become more slight alkali. We have improved the understanding of phosphate and fluoride precipitation mechanisms as function of change of alkali and pH.