Landfill Leachate Treatment
A landfill leachate pond measuring at a pH of 7 had high antimony concentrations that were over the discharge limit of 0.07 mg/L. The contaminated water also contained high levels of arsenic, iron, magnesium, manganese, and silica.
Hydrosil was contacted to evaluate the project and lower the levels of antimony and any other compounds. Hydrosil suggested two products for the application: HS-250-AC and HS-AS. Resin was used in the middle of the train per the suggestion of the landfill owner. The bench scale testing was completed at 10 minutes EBCT with a flowrate of 0.16 gpm. The bed volumes utilized were 0.063 ft3. After the study was completed, the system was installed in the field at 5 gpm in 55-gallon drums. The results for the system are shown in the table below.
| TREATMENT TRAIN | ||||
| Influent (mg/L) | Post HS-250-AC (mg/L) | Post IX (mg/L) | Post HS-AS (mg/L) | |
| Alkalinity (as CaCO3) | 1750 | 1800 | 1460 | 603 |
| Hardness (as CaCO3) | 1100 | 1000 | 1000 | 280 |
| Antimony, Total | 0.155 | 0.020 | 0.020 | 0.020 |
| Arsenic, Total | 0.971 | 0.584 | 0.554 | 0.532 |
| Iron, Total | 11.1 | 0.435 | 0.4 | 0.4 |
| Magnesium, Total | 101 | 83.8 | 81.0 | 44.7 |
| Manganese, Total | 0.964 | 0.585 | 0.105 | 0.0374 |
| Silica, Dissolved | 25.4 | 28.1 | 7.8 | 0.18 |
| pH | 6.82 | 7.36 | 7.23 | 7.13 |
| Temperature (°C) | 25.8 | 21.4 | 20.8 | 20.5 |
| Dissolved Oxygen (mg/L) | 0.059 | 1.7 | 4.6 | 7.1 |
