I am trying to obtain pure crystals of struvite at laboratory scale from a synthetic solution prepared by mixing salts of equal concentrations of magnesium ,ammonium and phosphorus in distilled water. I used jar tester for slow mixing( around 30 rpm) conditions at a pH of 9 and 8 both . But there is no significant phosphorus removal and also absence of struvite crystal formation.I only obtain a small amount of precipitate. What might be the possible reason for such an observation ? I assumed since there is no interference of foreign ions, P removal and struvite crystal formation should take place. But I am not able to achieve that .
Dear Goel,
According to your information, pH and level of rpm may not enough for the crystal formation.
Please try the method below , and details are avilable in the link.
Method: struvite solutions sould be prepared by mixing NH4OH , MgCl2 and H3PO4 with the mol ratio of 1 : 1 : 1 in the stirred glass vessel , at 200 rpm for 70 minutes. Temperature 3°C , initial pH of 10.
Piyal Aravinna
https://www.researchgate.net/post/what_can_be_the_possible_reason_behind_non_formation_of_struvite_crystals_in_synthetic_solution_made_of_distilled_water_and_salts_of_Mg_P_and_NH4?_ec=topicPostOverviewQuestionRecommendations&isAnswerFieldFocused=true&_sg=uXhE-LUO9pbNPOdMTg8n4ZTFBBY4I95Dv1BXus-Dnguw-XqBWSqXKv2kKWDSOcQ0uA.5gfZQnmrkRdvcZTuw_RMloz3EqsZ3uwbDHI0X4xA25UD_c4m8DqLL2-Fzq-CTKC9dy6ny5kLG15Fh_gF9X2d2YA
Thank you Mr. Aravinna
I wanted to know if the temperature condition of 3 C is important or a temperature greater than this can also work (around 20-30 C)?
Also kindly share the link again.
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