Manufacturing Wastewater Treatment Case Studies
Aircraft Components Wastewater Case Study - 20 percent savings
A major manufacturer of aircraft engine components was having difficulty meeting their effluent limits for COD (limit 235 ppm) and Zinc (limit 1.0 ppm). The source of the wastewater came from these processes:
- Mop water with alkaline cleaner
- Petroleum based machining coolant
- Floor scrubber water
- Wet dust collectors
- Vibratory finishing
- Emulsified oils/surfactants
- Non-destructive dye penetrants
Their chemistry to treat 3,000 gal/day wastewater was Sulfuric acid/caustic to adjust the pH to 9.0, aluminum chloride (AlCl), an anionic flocculant, and a precoat filter aid on the plate and frame press.
The facility tested the Floccin™ I and found that it eliminated the AlCl, the anionic flocculant, and the press precoat. The treatment costs were 20% less than previous levels and the effluent now meets their discharge limits (see the comparison below).
| Constituent | Old Chemistry | Floccin-I |
|---|---|---|
| COD | 450 ppm | 180 ppm |
| Oil & Grease | 18.6 ppm | <1.0 ppm |
| TSS | 25 ppm | 5 ppm |
| Zinc | 3.2 ppm | <1.0 ppm |
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