Abstract
This study was designed to evaluate the effect of shock loadings of odor-control chemicals used in chemical toilets on wastewater treatment processes. Laboratory activated sludge and septic tank treatment units operating at steady state were spiked with different odor-control chemicals over a 2-day period to simulate dumping of chemicals over the weekend, and their performance was evaluated. Three different chemicals were used, one containing formaldehyde, on containing paraformaldehyde, and a chemical containing dimethylimino ethylene dichloride polymer as the primary odor-control agent. The effect of the chemicals on COD removal and suspended solids discharge and the rate of recovery after shock loading was monitored. Both treatment systems withstood loadings amounting to 25% of the recommended dose for holding tanks without loss of treatment efficiency. At higher doses, a temporary reduction in COD removal occurred but the systems recovered over a period of several days after chemical addition ceased. The major negative effect on operation was loss of solids due to foaming in the activated sludge systems caused by surfactants in the chemicals.
| Original language | English |
|---|---|
| Pages (from-to) | 288-295 |
| Number of pages | 8 |
| Journal | Research Journal of the Water Pollution Control Federation |
| Volume | 62 |
| Issue number | 3 |
| State | Published - 1990 |