Solar detoxification of wastewater in a novel aerated cascade photoreactor (ACP).
A newly developed aerated cascade photoreactor (ACP), based on a non-concentrating suspension photoreactor, combines the advantages of a cascade with the increased mass-transfer and the use of oxygen from air as an oxidizing agent in a bubble column. Systematic studies of the limiting hydrodynamic conditions in the ACP and the solid/liquid-separation of the photocatalyst from the treated wastewater have shown that the ACP is technically and commercially attractive. The ACP outperforms the thin-film fixed-bed reactor (TFFBR) with respect to a 3-13 times higher degradation efficiency for the model compound dichloroacetic acid (DCA). The treatment of two biologically pretreated real wastewaters, one from a textile factory and one from car-washing, have been successfully carried out under artificial light and sunlight.
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Institut für Thermische Verfahrenstechnik Technische Universität Clausthal, Clausthal-Zellerfeld, Germany.
Geissen
S U
SU
Vogelpohl
A
A
D004396:Coloring Agents / Q000737:chemistry; D003999:Dichloroacetic Acid / Q000737:chemistry*; D004867:Equipment Design; D017665:Hydroxyl Radical; D007700:Kinetics; D010084:Oxidation-Reduction; D010100:Oxygen; D010777:Photochemistry; D013472:Sunlight; D013783:Textile Industry; D014025:Titanium / Q000737:chemistry; D014865:Waste Disposal, Fluid / Q000379:methods*; D014872:Water Movements; D018508:Water Purification / Q000379:methods*
D004396:Coloring Agents; C009495:titanium dioxide; D017665:Hydroxyl Radical; D003999:Dichloroacetic Acid; D014025:Titanium; D010100:Oxygen