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SL 299: Are Alum-Based Drinking Water Treatment Residuals Safe for Land Application?

Fig. 5. Trends of total dissolved Al concentrations in groundwater samples collected from a WTR field study conducted in the Okeechobee watershed from (A) shallow and (B) deep wells in an 18-mo study period (Agyin-Birikorang et al., 2009). Various P sources (fertilizer, poultry manure, or biosolids) were applied at rates sufficient to meet the nitrogen (N-based) or phosphorus (P-based) needs of the crop.