C CHEMISTRY; METALLURGY
C02 TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
C02F TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
C02F2103/00 Nature of the water, waste water, sewage or sludge to be treated
C02F2103/26 from the processing of plants or parts thereof