Aulick’s Industrial Specialty Chemical Consultant, Jeff Woodrow, was recently tasked with finding a chemical solution for zinc removal for a metal plating company. The company had spikes above the city zinc discharge limits of 3.5 ppm. After samples were gathered, extensive jar testing was performed on-site.
Photo 1 (above) shows the wastewater sample before chemical addition. Sample jars appear 1-4 from left to right.
Photo 2 (above) shows the 4 samples after AulClear CFP coagulant was added. A very good pin floc was produced.
Photo 3 (above) – Our expertise in wastewater treatment results in excellent floc formation. Our flocculant has brought the coagulated pin floc together. This produced a fast reacting, fast settling large floc.
Photo 4 (above) shows the 4 jar samples after settling. Samples were then pulled from each jar and tested for zinc levels by the wastewater treatment operator:
- Jar 1 – 0.64 Zn ppm (no metal precipitant)
- Jar 2 – 0.45 Zn ppm (lowest Zn level with Aulick metal precipitant)
- Jar 3 – 0.65 Zn ppm
- Jar 4 – 0.69 Zn ppm
*Aulick was able to meet discharge limits on all metals and organics. The color left behind in sample photos was from a dye in this particular application’s manufacturing process.