IPC 7 English version C02F !A-C02F 103:44

C02-C02F10344

SECTION C – CHEMISTRY; METALLURGY

C 02

TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (settling tanks, filtering, e.g. sand filters or screening devices, B01D)

C 02 F

TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F 9/04) [3]

Notes

(1)

Processes using enzymes or micro-organisms classified in this subclass are not further classified in subclass C12S. [5]

(2)

In this subclass, it is desirable to add the indexing codes of group C02F 101:00. The indexing codes should be linked. [7]

(3)

In this subclass, it is desirable to add the indexing codes of group C02F 103:00. The indexing codes should be unlinked. [7]

Subclass Index

CHEMICAL OR PHYSICAL TREATMENT

C02F 1/00, C02F 5/00

BIOLOGICAL TREATMENT

C02F 3/00

AERATION OF STRETCHES

C02F 7/00

MULTISTEP TREATMENT

C02F 9/00

TREATMENT OF SLUDGE

C02F 11/00

Treatment of water, waste water, or sewage (C02F 3/00 to C02F 9/00 take precedence) [3]

by heating (methods of steam generation F22B; preheating boiler feed-water or accumulating preheated boiler feed-water F22D) [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 B01D 19/00; arrangement of degassing apparatus in boiler feed supply F22D) [3]

by freezing [3]

by flotation (C02F 1/465 takes precedence) [3,5]

by extraction [3]

by sorption (using ion-exchange C02F 1/42; sorbent compositions B01J) [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 E02B 15/04; devices in sewers for separating liquid or solid substances from sewage E03F 5/14, e.g. for use in drains leading to the sewer E03F 5/16) [3,5]

by ion-exchange (ion-exchange in general B01J) [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 (C02F 1/46 takes precedence) [3]

by addition or application of a germicide or by oligodynamic treatment (C02F 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 C02F 1/42; softening water C02F 5/00) [3]

Silicon compounds [3]

Heavy metal compounds [3]

of iron or manganese [3]

by neutralisation; pH adjustment (for degassing C02F 1/20; using ion-exchange C02F 1/42; for flocculation or precipitation of suspended impurities C02F 1/52; for removing dissolved compounds C02F 1/58) [3]

by addition of specified substances, e.g. trace elements, for ameliorating potable water (medicinal water A61K) [3]

by reduction [3]

by oxidation [3]

with air (aeration of stretches of water C02F 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 B01J 19/30, B01J 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 C02F 1/42) [3]

Softening water by precipitation of the hardness [3]

using phosphates (C02F 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 (C02F 5/14 takes precedence) [3]

containing phosphorus [3]

Aeration of stretches of water [3]

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

Notes

(1)

This group covers only those combined treating operations where the essential characteristic resides in the combination of treatment steps. [3]

(2)

This group does not cover treatments where the essential characteristic resides in an individual step of the treatment, which treatments are covered by groups C02F 1/00 to C02F 7/00. An example of such treatments is a treatment in which the essential characteristic resides in a chemical treatment step and in which the one or more other steps, such as filtration or settlement, are conventional. [3]

(3)

In this group, in the absence of an indication to the contrary, classification is made in the last appropriate place. [7]

(4)

In this group, it is desirable to add the indexing codes relating to individual steps of the multistep treatment. The indexing codes, which are chosen from groups C02F 1/00 to C02F 1/56 or C02F 1/66 to C02F 7/00 have the same numbers as the classification symbols, but a colon is used instead of the oblique stroke, and should be linked. [7]

(5)

Attention is drawn to Chapter IV of the Guide which sets forth the rules concerning the application and presentation of the different types of indexing code. [7]

involving a separation step [7]

at least one step being a chemical treatment [7]

Electrochemical treatment [7]

at least one step being a physical treatment [7]

Thermal treatment [7]

Irradiation or treatment with electric or magnetic fields [7]

at least one step being a biological treatment [7]

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, F23G 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 C02F 11/10) [3]

11/

by freezing [3]

Indexing scheme associated with groups C02F 1/00 to C02F 11/00 relating to the nature of the contaminant in the water, waste water, sewage or sludge. The indexing codes should be linked. [7]

Note

Attention is drawn to Chapter IV of the Guide which sets forth the rules concerning the application and presentation of the different types of indexing code. [7]

101:

Nature of the contaminant [7]

101:

Inorganic compounds [7]

101:

Halogens or halogen-containing compounds [7]

101:

Fluorine or fluorine-containing compounds [7]

101:

Nitrogen compounds, e.g. ammonia [7]

101:

Cyanides [7]

101:

Heavy metals or heavy metal compounds [7]

101:

Chromium or chromium compounds, e.g. chromates [7]

101:

Organic compounds [7]

101:

Hydrocarbons, e.g. oil [7]

101:

containing oxygen [7]

101:

containing halogen [7]

101:

containing nitrogen [7]

Indexing scheme associated with groups C02F 1/00 to C02F 11/00, relating to the nature of the water, waste water, sewage or sludge to be treated. The indexing codes should be unlinked. [7]

Note

Attention is drawn to Chapter IV of the Guide which sets forth the rules concerning the application and presentation of the different types of indexing code. [7]

103:

Nature of the water, waste water, sewage or sludge to be treated [7]

103:

Non-contaminated water, e.g. for industrial water supply [7]

103:

for obtaining pure or ultra-pure water [7]

103:

Contaminated groundwater or leachate [7]

103:

Seawater, e.g. for desalination [7]

103:

from quarries or from mining activities [7]

103:

from the silicate or ceramic industries, e.g. waste waters from cement or glass factories [7]

103:

Paint wastes [7]

103:

from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes [7]

103:

from the wet purification of gaseous effluents [7]

103:

from animal husbandry [7]

103:

from the processing of animals, e.g. poultry, fish, or parts thereof [7]

103:

from tanneries [7]

103:

from the processing of plants or parts thereof [7]

103:

from the paper or cellulose industry [7]

103:

from the textile industry [7]

103:

from the food or foodstuff industry, e.g. brewery waste waters [7]

103:

from the chemical industry not provided for in groups C02F 103:12 to C02F 103:32 [7]

103:

from the manufacture of organic compounds [7]

103:

Polymers [7]

103:

from the manufacture or use of photosensitive materials [7]

103:

from bathing facilities, e.g. swimming pools [7]

103:

from vehicle washing facilities [7]