Coagulation activity of spray dried salt extracted Moringa oleifera

摘要

A study on the effectiveness of salt extracted Moringa oleifera seeds as a coagulant for turbidity removal in water treatment process under different operational parameters (configurations) of spray drying, storage, and packaging conditions is presented. The operational parameters were inlet temperature, outlet temperature, and pumping rates. The coagulation activity was studied for the spray dried salt extracted M. oleifera which is stored under two different conditions, room temperature (29 ℃) and refrigerator (3℃), and two different packaging forms, closed container and vacuum packed. Eight configurations for operational parameters were used in this study. The results show that for inlet temperature below 115℃ the spray drying process failed to produce dry powder. For the successful configurations, there was no significant difference in coagulation activity between different configurations stored at the same storage and packaging conditions. However, the comparison of the coagulation activity of the spray dried M. oleifera with the same packaging conditions (closed container or vacuum packing) under different storage conditions (room temperature 29 ℃ or refrigerator 3℃) revealed that there was a significant difference between them; the coagulation activity of spray dried M. oleifera stored at room temperature was significantly better than refrigerator during the study duration. On the other hand, the packaging condition (closed container or vacuum packing) does not affect the coagulation activity of spray dried M. oleifera stored at the same temperature.