IPC 6 English version C02F !A-C02F 11/20

C02-C02F01120

SECTION C– CHEMISTRY; METALLURGY

C 02

TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (settling tanks, filtering, e.g. sand filters or screening devices, B 01 D)

C 02 F

TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B 01 D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B 63 J; adding materials to water to prevent corrosion C 23 F; treating radioactively-contaminated liquids G 21 F 9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes) [3]

Note

Processes using enzymes or micro-organisms classified in this subclass are not further classified in subclass C 12 S. [5]

Treatment of water, waste water, or sewage (C 02 F 3/00 to C 02 F 9/00 take precedence) [3]

by heating (methods of steam generation F 22 B; preheating boiler feed-water or accumulating preheated boiler feed-water F 22 D) [3]

by distillation or evaporation [3]

Flash evaporation [3]

Thin film evaporation [3]

by direct contact with a particulate solid or with a fluid, as a heat transfer medium [3]

Spray evaporation [3]

using solar energy [3]

using waste heat from other processes [3]

Transportable devices to obtain potable water [3]

by degassing, i.e. liberation of dissolved gases (degasification of liquids in general B 01 D 19/00; arrangement of degassing apparatus in boiler feed supply F 22 D) [3]

by freezing [3]

by flotation (C 02 F 1/465 takes precedence) [3,5]

by extraction [3]

by sorption (using ion-exchange C 02 F 1/42; sorbent compositions B 01 J) [3]

by irradiation [3]

with ultra-violet light [3]

with mechanical oscillations [3]

ultrasonic vibrations [3]

by centrifugal separation [3]

Devices for separating or removing fatty or oily substances or similar floating material (cleaning or keeping clear the surface of open water from oil or like materials E 02 B 15/04; devices in sewers for separating liquid or solid substances from sewage E 03 F 5/14, e.g. for use in drains leading to the sewer E 03 F 5/16) [3,5]

by ion-exchange (ion-exchange in general B 01 J) [3]

by dialysis, osmosis or reverse osmosis [3]

by electrochemical methods [3,5]

461

by electrolysis [5]

463

by electrocoagulation [5]

465

by electroflotation [5]

467

by electrochemical disinfection [5]

469

by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis [5]

with magnetic or electric fields (C 02 F 1/46 takes precedence) [3]

by addition or application of a germicide or by oligodynamic treatment (C 02 F 1/467 takes precedence) [3,5]

by flocculation or precipitation of suspended impurities [3]

using organic material [3]

Macromolecular compounds [3]

by removing specified dissolved compounds (using ion-exchange C 02 F 1/42; softening water C 02 F 5/00) [3]

Silicon compounds [3]

Heavy metal compounds [3]

of iron or manganese [3]

by neutralisation; pH adjustment (for degassing C 02 F 1/20; using ion-exchange C 02 F 1/42; for flocculation or precipitation of suspended impurities C 02 F 1/52; for removing dissolved compounds C 02 F 1/58) [3]

by addition of specified substances, e.g. trace elements, for ameliorating potable water (medicinal water A 61 K) [3]

by reduction [3]

by oxidation [3]

with air (aeration of stretches of water C 02 F 7/00) [3]

with halogens or compounds of halogens [3]

with ozone [3]

Biological treatment of water, waste water, or sewage [3]

Aerobic processes [3]

using trickle filters [3]

using submerged filters [3]

using moving contact bodies [3]

Packings; Fillings; Grids (packing elements in general B 01 J 19/30, B 01 J 19/32) [3]

Activated sludge processes [3]

using surface aeration [3]

the aerator having a vertical axis [3]

the aerator having a horizontal axis [3]

using diffusers [3]

using circulation pipes [3]

using free-fall aeration or spraying [3]

using pure oxygen or oxygen-rich gas [3]

Anaerobic digestion processes [3]

Aerobic and anaerobic processes [3]

characterised by the animals or plants used, e.g. algae [3]

characterised by the micro-organisms used [3]

Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents (softening using ion-exchange C 02 F 1/42) [3]

Softening water by precipitation of the hardness [3]

using phosphates (C 02 F 5/06 takes precedence) [3]

using calcium compounds [3]

Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents [3]

using organic substances [3]

containing nitrogen (C 02 F 5/14 takes precedence) [3]

containing phosphorus [3]

Aeration of stretches of water [3]

Multistage treatment of water, waste water or sewage [3]

Notes

(1)

This group covers only those combined treating operations where the interest is directed to the relationship between the steps. [3]

(2)

This group does not cover, for example, chemical treatment followed by settlement or biological treatment involving normal mechanical treatment. [3]

11/

Treatment of sludge; Devices therefor [3]

11/

Biological treatment [3]

11/

Anaerobic treatment; Production of methane by such processes [3]

11/

by oxidation (incinerators or other apparatus for burning waste liquors, e.g. sulfite liquor from paper-making plant, F 23 G 7/04) [3]

11/

Wet air oxidation [3]

11/

by pyrolysis [3]

11/

by de-watering, drying, or thickening [3]

11/

with addition of chemical agents [3]

11/

using drying or composting beds [3]

11/

by thermal conditioning (by pyrolysis C 02 F 11/10) [3]

11/

by freezing [3]