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°C. A limiting value of 60% COD release was obtained for 500 and 700 bars after 10 passes. Concerning the oxidative 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.
A comparative study between mechanical, thermal and oxidative disintegration techniques of waste activated sludge
P. Camacho, S. Deleris, V. Geaugey, P. Ginestet, E. Paul; A comparative study between mechanical, thermal and oxidative disintegration techniques of waste activated sludge. Water Sci Technol 1 November 2002; 46 (10): 79–87. doi: https://doi.org/10.2166/wst.2002.0295
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