| 1/00 | Treatment of water, waste water, or sewage (C02F 3/00-C02F 9/00 take precedence) |
| 1/02 | Treatment of water, waste water, or sewage (C02F 3/00-C02F 9/00 take precedence) by heating |
| 1/04 | Treatment of water, waste water, or sewage (C02F 3/00-C02F 9/00 take precedence) by heating by distillation or evaporation |
| 1/06 | Treatment of water, waste water, or sewage (C02F 3/00-C02F 9/00 take precedence) by heating by distillation or evaporation Flash evaporation |
| 1/08 | Treatment of water, waste water, or sewage (C02F 3/00-C02F 9/00 take precedence) by heating by distillation or evaporation Thin film evaporation |
| 1/10 | Treatment of water, waste water, or sewage (C02F 3/00-C02F 9/00 take precedence) by heating by distillation or evaporation by direct contact with a particulate solid or with a fluid, as a heat transfer medium |
| 1/12 | Treatment of water, waste water, or sewage (C02F 3/00-C02F 9/00 take precedence) by heating by distillation or evaporation by direct contact with a particulate solid or with a fluid, as a heat transfer medium Spray evaporation |
| 1/14 | Treatment of water, waste water, or sewage (C02F 3/00-C02F 9/00 take precedence) by heating by distillation or evaporation using solar energy |
| 1/16 | Treatment of water, waste water, or sewage (C02F 3/00-C02F 9/00 take precedence) by heating by distillation or evaporation using waste heat from other processes |
| 1/18 | Treatment of water, waste water, or sewage (C02F 3/00-C02F 9/00 take precedence) by heating by distillation or evaporation Transportable devices to obtain potable water |
| 1/20 | Treatment of water, waste water, or sewage (C02F 3/00-C02F 9/00 take precedence) by degassing, i.e. liberation of dissolved gases |
| 1/22 | Treatment of water, waste water, or sewage (C02F 3/00-C02F 9/00 take precedence) by freezing |
| 1/24 | Treatment of water, waste water, or sewage (C02F 3/00-C02F 9/00 take precedence) by flotation (C02F 1/465 takes precedence) |
| 1/26 | Treatment of water, waste water, or sewage (C02F 3/00-C02F 9/00 take precedence) by extraction |
| 1/28 | Treatment of water, waste water, or sewage (C02F 3/00-C02F 9/00 take precedence) by sorption (using ion-exchange C02F 1/42; sorbent compositions B01J) |
| 1/30 | Treatment of water, waste water, or sewage (C02F 3/00-C02F 9/00 take precedence) by irradiation |
| 1/32 | Treatment of water, waste water, or sewage (C02F 3/00-C02F 9/00 take precedence) by irradiation with ultra-violet light |
| 1/34 | Treatment of water, waste water, or sewage (C02F 3/00-C02F 9/00 take precedence) with mechanical oscillations |
| 1/36 | Treatment of water, waste water, or sewage (C02F 3/00-C02F 9/00 take precedence) with mechanical oscillations ultrasonic vibrations |
| 1/38 | Treatment of water, waste water, or sewage (C02F 3/00-C02F 9/00 take precedence) by centrifugal separation |