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Jar testing

Case Study - Taste and Odor Removal

Background and Objectives

The purpose of this study was to evaluate the treatment effectiveness of various powdered activated carbon (PAC) products for the removal of common Taste and Odor (T&O) compounds. Raw sample water was collected, and analyzed for the T&O compounds 2-methylisoborneol (MIB) and geosmin to determine a baseline concentration. A high T&O event was simulated by spiking the water with geosmin to a target concentration of 30 to 35 ng/L (actual spike achieved was 33.7 ng/L).   

Figure 1: Jar test with various PAC dosages applied: (left) last stage of flocculation, (middle) beginning of sedimentation and (right) final clarified water.

Jar Testing Outcome

Standard Jar Testing was performed using the same coagulant type and dose used by the facility, as well as mixing energies/durations simulating the facility’s coagulation/flocculation basins followed by sedimentation. A total of thirteen jars were treated identically, with 1 control (no PAC addition) and each one of the other 12 jars receiving a different dose of PAC and/or a different PAC product for a direct comparison. Supernatant samples were analyzed for T&O compounds as well as DOC and UV absorbance at a wavelength of 254 nm (surrogate for organics). The results were used for the selection of the best product and dose to use onsite.

Figure 2: Geosmin removal comparison.

For More Information

Please contact Brad.Suedbeck@testamericainc.com 541-243-6131