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IPC 7
C02-C02F10344

SECTION C – CHEMISTRY; METALLURGY


C 02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (settling tanks, filtering, e.g. sand filters or screening devices, B01D)


C 02 FTREATMENT 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 



1/

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

1/

02.by heating (methods of steam generation F22B; preheating boiler feed-water or accumulating preheated boiler feed-water F22D)  [3]

1/

04..by distillation or evaporation  [3]

1/

06...Flash evaporation  [3]

1/

08...Thin film evaporation  [3]

1/

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

1/

12....Spray evaporation  [3]

1/

14...using solar energy  [3]

1/

16...using waste heat from other processes  [3]

1/

18...Transportable devices to obtain potable water  [3]

1/

20.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]

1/

22.by freezing  [3]

1/

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

1/

26.by extraction  [3]

1/

28.by sorption (using ion-exchange C02F 1/42; sorbent compositions B01J)  [3]

1/

30.by irradiation  [3]

1/

32..with ultra-violet light  [3]

1/

34.with mechanical oscillations  [3]

1/

36..ultrasonic vibrations  [3]

1/

38.by centrifugal separation  [3]

1/

40.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]

1/

42.by ion-exchange (ion-exchange in general B01J)  [3]

1/

44.by dialysis, osmosis or reverse osmosis  [3]

1/

46.by electrochemical methods  [3,5]

1/

461..by electrolysis  [5]

1/

463...by electrocoagulation  [5]

1/

465...by electroflotation  [5]

1/

467...by electrochemical disinfection  [5]

1/

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

1/

48.with magnetic or electric fields (C02F 1/46 takes precedence)  [3]

1/

50.by addition or application of a germicide or by oligodynamic treatment (C02F 1/467 takes precedence)  [3,5]

1/

52.by flocculation or precipitation of suspended impurities  [3]

1/

54..using organic material  [3]

1/

56...Macromolecular compounds  [3]

1/

58.by removing specified dissolved compounds (using ion-exchange C02F 1/42; softening water C02F 5/00)  [3]

1/

60..Silicon compounds  [3]

1/

62..Heavy metal compounds  [3]

1/

64...of iron or manganese  [3]

1/

66.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]

1/

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

1/

70.by reduction  [3]

1/

72.by oxidation  [3]

1/

74..with air (aeration of stretches of water C02F 7/00)  [3]

1/

76..with halogens or compounds of halogens  [3]

1/

78..with ozone  [3]


3/

00Biological treatment of water, waste water, or sewage  [3]

3/

02.Aerobic processes  [3]

3/

04..using trickle filters  [3]

3/

06..using submerged filters  [3]

3/

08..using moving contact bodies  [3]

3/

10..Packings; Fillings; Grids (packing elements in general B01J 19/30, B01J 19/32)  [3]

3/

12..Activated sludge processes  [3]

3/

14...using surface aeration  [3]

3/

16....the aerator having a vertical axis  [3]

3/

18....the aerator having a horizontal axis  [3]

3/

20...using diffusers  [3]

3/

22...using circulation pipes  [3]

3/

24...using free-fall aeration or spraying  [3]

3/

26...using pure oxygen or oxygen-rich gas  [3]

3/

28.Anaerobic digestion processes  [3]

3/

30.Aerobic and anaerobic processes  [3]

3/

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

3/

34.characterised by the micro-organisms used  [3]


5/

00Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents (softening using ion-exchange C02F 1/42) [3]

5/

02.Softening water by precipitation of the hardness  [3]

5/

04..using phosphates (C02F 5/06 takes precedence)  [3]

5/

06..using calcium compounds  [3]

5/

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

5/

10..using organic substances  [3]

5/

12...containing nitrogen (C02F 5/14 takes precedence)  [3]

5/

14...containing phosphorus  [3]


7/

00Aeration of stretches of water  [3]


9/

00Multistep 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]

9/

02.involving a separation step [7]

 

9/

04.at least one step being a chemical treatment [7]

 

9/

06..Electrochemical treatment [7]

 

9/

08.at least one step being a physical treatment [7]

 

9/

10..Thermal treatment [7]

 

9/

12..Irradiation or treatment with electric or magnetic fields [7]

 

9/

14.at least one step being a biological treatment [7]

 


11/

00Treatment of sludge; Devices therefor  [3]

11/

02.Biological treatment  [3]

11/

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

11/

06.by oxidation (incinerators or other apparatus for burning waste liquors, e.g. sulfite liquor from paper-making plant, F23G 7/04)  [3]

11/

08..Wet air oxidation  [3]

11/

10.by pyrolysis  [3]

11/

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

11/

14..with addition of chemical agents  [3]

11/

16..using drying or composting beds  [3]

11/

18.by thermal conditioning (by pyrolysis C02F 11/10)  [3]

11/

20..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:

00Nature of the contaminant [7]

101:

10.Inorganic compounds [7]

101:

12..Halogens or halogen-containing compounds [7]

101:

14...Fluorine or fluorine-containing compounds [7]

101:

16..Nitrogen compounds, e.g. ammonia [7]

101:

18...Cyanides [7]

101:

20..Heavy metals or heavy metal compounds [7]

101:

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

101:

30.Organic compounds [7]

101:

32..Hydrocarbons, e.g. oil [7]

101:

34..containing oxygen [7]

101:

36..containing halogen [7]

101:

38..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:

00Nature of the water, waste water, sewage or sludge to be treated [7]

103:

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

103:

04..for obtaining pure or ultra-pure water [7]

103:

06.Contaminated groundwater or leachate [7]

103:

08.Seawater, e.g. for desalination [7]

103:

10.from quarries or from mining activities [7]

103:

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

103:

14.Paint wastes [7]

103:

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

103:

18.from the wet purification of gaseous effluents [7]

103:

20.from animal husbandry [7]

103:

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

103:

24..from tanneries [7]

103:

26.from the processing of plants or parts thereof [7]

103:

28..from the paper or cellulose industry [7]

103:

30.from the textile industry [7]

103:

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

103:

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

103:

36..from the manufacture of organic compounds [7]

103:

38...Polymers [7]

103:

40..from the manufacture or use of photosensitive materials [7]

103:

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

103:

44.from vehicle washing facilities [7]

  
 

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