C
SECTION C — CHEMISTRY AND METALLURGY
  
CHEMISTRY
 C02
TREATMENT WATER, WASTE WATER AND SEWAGE (distilling, filtering, separating B01)
 C02C
TREATMENT OF SEWAGE AND WASTE WATER (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 1/17
·  ·  by combined aerobic and anaerobic processes  [2]
 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 E03F 5/16)
 C02C 1/40
·  Chemical purification
 C02C 3/00
Methods or installations for dewatering, drying or incineration of sludge
 C02C 5/00
Treatment of waste water (C02C 1/00 takes precedence; treating radioactive liquid waste material G21F 9/04)
 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
( transferred to G21F 9/04 )