Patent classifications
C
CHEMISTRY; METALLURGY
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C02
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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C02F
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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3/00
Biological treatment of water, waste water, or sewage
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C02F3/10
Packings; Fillings; Grids
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C02F3/105
Characterized by the chemical composition
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C02F3/108
Immobilising gels, polymers or the like
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