|  | C |
SECTION C — CHEMISTRY AND METALLURGY

CHEMISTRY

|  | C02 |
TREATMENT OF WATER, WASTE WATER AND SEWAGE (distilling, filtering, separating Fulltext... Hierarchy... Expanded...B01)

|  | C02C |
TREATMENT OF SEWAGE AND WASTE WATER (Fulltext... Hierarchy... Expanded...C02B takes precedence)

|  | C02C 1/00 |
Treatment of sewage

|  | C02C 1/02 |
· | Biological purification

|  | C02C 1/04 |
· · | using trickling filters or similar apparatus

|  | C02C 1/06 |
· · | by the activated sludge process

|  | C02C 1/08 |
· · · | using circulation pipes

|  | C02C 1/10 |
· · · | using means for aeration at the surface of the sludge

|  | C02C 1/12 |
· · · | Diffusers

|  | C02C 1/14 |
· · | by digestion; Production of methane

|  | C02C 1/16 |
· · · | Tanks provided with a separate digestion compartment

|  | C02C 1/18 |
· | Mechanical purification

|  | C02C 1/20 |
· · | Sand-retaining means

|  | C02C 1/22 |
· · | Screening devices; Cleaning rakes; Comminuters

|  | C02C 1/24 |
· · | Centrifugal purification of sewage

|  | C02C 1/26 |
· · | Settling tanks; Devices for separating or removing fatty or oily substances or similar floating material; Mechanical devices for use therewith

|  | C02C 1/28 |
· · · | with longitudinal liquid stream

|  | C02C 1/30 |
· · · · | with mowing scrapers

|  | C02C 1/32 |
· · · | with radial liquid stream

|  | C02C 1/34 |
· · · · | with mowing scrapers

|  | C02C 1/36 |
· · · | Discharge devices for sludge

|  | C02C 1/38 |
· · · | Devices for separating of removing fatty or oily substances or similar floating material (for use in drains leading to the main sewer Fulltext... Hierarchy... Expanded...E03F 5/16)

|  | C02C 1/40 |
· | Chemical purification

|  | C02C 3/00 |
Methods or installations for dewatering, drying sewage sludge

|  | C02C 5/00 |
Treatment of waste water (Fulltext... Hierarchy... Expanded...C02C 1/00 takes precedence)

|  | C02C 5/02 |
· | by chemical means; by adsorption

|  | C02C 5/04 |
· · | by oxidation

|  | C02C 5/06 |
· · · | combined with mechanical purification

|  | C02C 5/08 |
· · | with ion-exchange material

|  | C02C 5/10 |
· | Biological treatment

|  | C02C 5/12 |
· | Electrolytic treatment

|  | C02C 5/14 |
· | Removal of radioactive materials