Citation:

Nadagouda, M., G. Varshney, E. Martin, C. Soryong, AND N. Kesav. Phosphate Removal and Recovery using Drinking Water Plant Waste Residuals - abstract. Presented at ACS Central Regional Meeting 2016, Covington, KY, May 18 - 21, 2016.

Impact/Purpose:

Nutrient Recovery

Description:

Phosphates adsorbed on calcium carbonate are environmental friendly, as they do not require further treatment for the phosphate species desorption due to its effectiveness as the plant fertilizer. In this study, an inexpensive calcium carbonate obtained as a waste material from drinking water plant was used as an adsorbent for phosphate removal and recovery from water. In this study, the adsorption behavior of phosphate on calcium carbonate was investigated via a series of batch experiments under different experimental conditions. The SEM images showed that particles were porous, irregular shaped and aggregated in the range of 1 to 10 µm. The failure to detect phosphorus in XRD results as detectable peaks suggested that the phosphates were not incorporated into the calcite and dolomite crystal lattice. The phosphate adsorption kinetics was studied from 5 min to 5 days onto several calcite adsorbents with masses ranging from 0.1 g to 2 g. The results showed that adsorption of phosphate was time dependent.

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