Treatment of organic synthesis wastewater using anaerobic packed bed and aerobic suspended growth bioreactors.
The performance of an anaerobic mesophilic packed bed reactor, with a mixture of GAC and tezontle, followed by an aerobic suspended growth system was studied for the treatment of organic chemical wastewater with a high COD concentration (22-29 g/L). The testing of the anaerobic-aerobic system was conducted in an experimental set-up for almost 2.5 years. Different operational conditions were evaluated. The anaerobic reactor showed performance stability and COD removals higher than 80% were obtained with loads up to 16.6 kg x m(-3) x d(-1). The acclimation of the aerobic biomass to the substrate in the anaerobic effluent was very quick and COD removals higher than 94% were obtained even at high organic loads. The combined anaerobic-aerobic system allowed total COD removals higher than 99.5% and the accomplishment of the discharge requirements of 200 mgCOD/L when the anaerobic reactor was operated with loads of 8-11 kg x m(-3)x d(-1) and the aerobic reactor with 0.33 kg x kg(-1) x d(-1), being the total HRT of 4.4. The average TKN removal in the anaerobic-aerobic system was 97%, the average for the anaerobic reactor being 52% and that one for the aerobic system being 94%.
Mijaylova-Nacheva
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Mexican Institute of Water Technology, Paseo Cuauhnahuac 8532, Col. Progreso, 62550 Jiutepec, Morelos, Mexico. petiam@tlaloc.imta.mx
Ramírez-Camperos
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Cuevas-Velasco
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D000332:Aerobiosis; D000693:Anaerobiosis; D018441:Biofilms; D019149:Bioreactors; D005374:Filtration; D009584:Nitrogen / Q000302:isolation & purification; D009930:Organic Chemicals / Q000302:isolation & purification*; D010100:Oxygen; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
D009930:Organic Chemicals; D014874:Water Pollutants, Chemical; D009584:Nitrogen; D010100:Oxygen