Manufacturing Wastewater Treatment Case Studies
Mop Waste Water Treatment Test
Mop & Scrubber Untreated Waste Water Sample
The samples were tested at our facility on
Thursday, March 20, 2003. Visually the
samples were a homogeneous mixture of mop
water, oil, and metals. The initial pH was 10.5
and the conductivity was 7,500 uS.
The sample was ozonated at a setting of 35% of capacity (35% of 3.9 gm/hour) or 1.37 gm/hour in the stabilization column for 12 hours. There appeared to be very little separation of oils from the mixture although there was noticeable decrease in the water viscosity (surface tension) indicating the effect of the ozonation process. Post ozonation pH was 10.5 and the conductivity was 6,621 uS (a drop of 879 uS).
Flocculated Sample
With 2,000 ml of sample and using a 2,500 ml
square container, the pH was decreased with
sulfuric acid (the CO2 unit we would
normally use was in the field) using 20 ml of a
20% acid solution to a final pH of 7.0+/-.
The ORP meter was then used to measure the ORP, which is an indication of the residual metals in solution. The initial reading after pH adjusting to 7.0 was +86 mV. Adding IE- 061 dropped the ORP down to -123.4 mV with a dosage of 0.4 ml. (200 ppm)
Resulting Flocculent
50 gm. of Floccin™ HP was added to the 2,000 ml and mixed at 300 rpm for 10 minutes until the floc was stable and there was a clear separation of floc and water. The floc/water was then poured through dewatering paper and the samples were collected for analytical work.
The analytical results are shown in the table (units are in ppm or mg/L):
| Analyte | Untreated | Treated | % Reduction |
|---|---|---|---|
| Ammonia | 54 | ND | 99% |
| Biological Oxygen Demand | 6,600 | 2,700 | 59% |
| Chemical Oxygen Demand | 46,000 | 14,000 | 69.5% |
| Suspended Solids | 1,900 | 100 | 94.7% |
| Antimony | ND | ND | ND |
| Arsenic | ND | ND | ND |
| Barium | 0.90 | ND | 99% |
| Beryllium | ND | ND | ND |
| Cadmium | ND | ND | ND |
| Chromium | ND | ND | ND |
| Cobalt | ND | ND | ND |
| Copper | 1.1 | ND | 99% |
| Cyanide | 18 | 1.5 | 91.7% |
| Lead | .4 | ND | 99% |
| Mercury | ND | ND | ND |
| Molybdenum | ND | ND | ND |
| Nickel | ND | ND | ND |
| Selenium | ND | ND | ND |
| Silver | ND | ND | ND |
| Thallium | ND | ND | ND |
| Vanadium | ND | ND | ND |
| Zinc | 38 | 3.6 | 90.5% |
*Carbon Dioxide (non hazardous) will be used instead of acid (hazardous)
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