Parametric Analysis of the Ferrite Process

Author : Cortez, Von Ryan Villanueva
Major Adviser : Arquiza, Apollo C.
Committee Members : Acda, Reynaldo I.; Movillon, Jovita A. 
Year : 1996
Month : April
Type : Thesis
Degree: BS
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A parametric study on the Ferrite process developed by Tamaura (1986) was done using prepared solutions which approximate the iron content of electroplating wastewater. The prepared solutions contained 150 mg/L of ferrous ions. The pH adjustments were set at 9, 10, and 11. The temperature used for the precipitation was set at 65 °C.

Three replicates per pH value were done. Twenty-five milliliters of waste samples and volumes of 15 milliliters ferrous sulfate were poured into 250-ml beakers. The solutions were heated to 65 °C. Afterwards, these solutions were poured into 1-liter graduated cylinder to test the precipitates settling rates. The sedimentation tests were done with and without a magnet. The magnet strengths were set at 0.7, 0.8, 0.9, 1.0, and 1.1 gauss. It was found out that the settling rates become nearly constant at 1.0 to 1.1 gauss. The solutions were filtered in order to separate the precipitates (ferrite sludge) from the treated water. The precipitates and the treated water were further analyzed for their ferrous content. Permanganimetry was the method used.

The effect of pH on the percent removal of iron from prepared solutions was observed. Results showed that an increase in pH value caused a significant increase in the amount of ferrous ion from 0.1360 to 0.1434 grams in the precipitates reduced. It was observed that pH 11.0 had the highest amount of ferrous ion. On the other hand, the increase in pH caused a significant decrease in the amount of ferrous ion from 0.0123 to 0.0059 grams for every 25 milliliters of the treated water. pH 11.0 was found out to have the highest settling rate and lowest concentration of the ferrous ion in the treated water indicating that a higher pH value, more ferrous ions are precipitated. Consequently, the percent removal of iron increases as the pH value increases.

The settling rates of the precipitates subjected to different magnet strengths were significantly different from that of the precipitates without magnet. An increase in the magnet strengths caused a significant increase in the settling rates of the precipitates.

The higher the pH value, the higher the settling rates, the more the amount of ferrous ion to be removed from the prepared solutions and the higher the percent removal of iron and the higher the magnet strength, the higher the settling rate of the precipitates.

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