|  | C |
SECTION C — CHEMISTRY AND METALLURGY

|  | C |
Note(s) Definitions for Section C: Alkali metals: Li, Na, K, Rb, Cs, Fr Alkaline earth metals: Ca, Sr, Ba, Ra Lanthanides: elements with atomic numbers 57 to 71 inclusive Rare earths: Sc, Y, Lanthanides Actinides: elements with atomic numbers 89 to 103 inclusive Refractory metals: Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, W Halogens: F, Cl, Br, I, At Noble gases: He, Ne, Ar, Kr, Xe, Rn Platinum group: Os, Ir, Pt, Ru, Rh, Pd Noble metals: Ag, Au, Platinum group Light metals: alkali metals, alkaline earth metals, Be, Al, Mg Heavy metals: metals other than light metals Iron group: Fe, Co, Ni Non-metals: H, B, C, Si, N, P, O, S, Se, Te, noble gases, halogens Metals: elements other than non-metals Transition elements: elements with atomic numbers 21 to 30 inclusive, 39 to 48 inclusive, 57 to 80 inclusive, 89 upwards

CHEMISTRY

|  | C02 |
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (settling tanks, filtering, e.g. sand filters or screening devices, Fulltext... Hierarchy... Expanded...B01D)

|  | C02B |
( transferred to Fulltext... Hierarchy... Expanded...C02F )

|  | C02C |
( transferred to Fulltext... Hierarchy... Expanded...C02F )

|  | C02D |
( transferred to Fulltext... Hierarchy... Expanded...A23L 2/00, Fulltext... Hierarchy... Expanded...B01F, Fulltext... Hierarchy... Expanded...C02F )

|  | C02F |
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general Fulltext... Hierarchy... Expanded...B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, Fulltext... Hierarchy... Expanded...B63J; adding materials to water to prevent corrosion Fulltext... Hierarchy... Expanded...C23F; treating radioactively contaminated liquids Fulltext... Hierarchy... Expanded...G21F 9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes) [3]