A comparative study between mechanical, thermal and oxidative disintegration techniques of waste activated sludge.
The release performances of an organic and mineral activated sludge matrix were studied for a wide range of disintegration treatments like mechanical, thermal, thermal-chemical and oxidative disintegration techniques. The maximal COD release was 35% of total COD after 24 hours contact time at 95 degrees C. A limiting value of 60% COD release was obtained for 500 and 700 bars after 10 passes. Concerning theoxidative disintegration techniques (O3 and H2O2), a limiting value of around 60-65% of TOC release was observed. Therefore, it was hypothesised that thermal and mechanical treatments allow mainly for breaking apart the micro-organisms while the oxidative treatment destroys the sludge flocs and disrupts the micro-organisms. A release effect of the mineral fraction is observed only oxidative disintegration techniques.
Camacho
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P
CIRSEE, ONDEO Services 38, Rue du President Wilson, 78230 Le Pecq, France. patricia.camacho@ondeo.com
Deleris
S
S
Geaugey
V
V
Ginestet
P
P
Paul
E
E
D006861:Hydrogen Peroxide / Q000737:chemistry; D016877:Oxidants / Q000737:chemistry; D010083:Oxidants, Photochemical / Q000737:chemistry; D010084:Oxidation-Reduction; D010100:Oxygen; D010126:Ozone / Q000737:chemistry; D012722:Sewage / Q000737:chemistry* / Q000382:microbiology*; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000379:methods*
D016877:Oxidants; D010083:Oxidants, Photochemical; D012722:Sewage; D010126:Ozone; D006861:Hydrogen Peroxide; D010100:Oxygen