A Comparative Study of Physical and Chemical Processes for Removal of Biomass in Biofilters
| Autor: | Enrique Godínez Domínguez, José A. Morales-González, Sergio O. Flores-Valle, Pablo López-Albarán, Rafael Herrera-Bucio, Tomás Fregoso-Aguilar, Jorge Chanona-Pérez, Ángel Morales-González, Omar Ríos-Bernÿ, Jorge A. Mendoza-Pérez, Christian Kennes, Ma Carmen Veiga-Barbazán, V. Garibay-Febles, Oscar Jesús Prado-Rubianes |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
downward flow
biofilter backwashing air sparging biofilm clogging batch assay filter bed biomass control Clogging Sodium Hypochlorite Pharmaceutical Science Biomass Batch assay Analytical Chemistry Bioreactors Drug Discovery Biomass control Water content Chemistry Biofilm Temperature Hydrogen-Ion Concentration Pulp and paper industry Biodegradation Environmental Distilled water Chemistry (miscellaneous) Backwashing Biofilter Molecular Medicine Biotechnology Microbial Consortia Article lcsh:QD241-441 lcsh:Organic chemistry Air Pollution Pressure Downward flow Bioreactor Sodium Hydroxide Physical and Theoretical Chemistry Distillation Volatile Organic Compounds Filter bed Chromatography Organic Chemistry Water Biodegradation Kinetics Air sparging Filtration Toluene |
| Zdroj: | RUC. Repositorio da Universidade da Coruña instname Molecules Molecules, Vol 16, Iss 8, Pp 6927-6949 (2011) Molecules; Volume 16; Issue 8; Pages: 6927-6949 |
| ISSN: | 1420-3049 |
| DOI: | 10.3390/molecules16086927 |
| Popis: | After 6 months of operation a long-term biofilter was stopped for two weeks and then it was started up again for a second experimental period of almost 1.3 years, with high toluene loads and submitted to several physical and chemical treatments in order to remove excess biomass that could affect the reactor's performance due to clogging, whose main effect is a high pressure drop. Elimination capacity and removal efficiency were determined after each treatment. The methods applied were: filling with water and draining, backwashing, and air sparging. Different flows and temperatures (20, 30, 45 and 60 °C) were applied, either with distilled water or with different chemicals in aqueous solutions. Treatments with chemicals caused a decrease of the biofilter performance, requiring periods of 1 to 2 weeks to recover previous values. The results indicate that air sparging with pure distilled water as well as with solutions of NaOH (0.01% w/v) and NaOCl (0.01% w/v) were the treatments that removed more biomass, working either at 20, 30 or 45 °C and at relatively low flow rates (below 320 L h(-1)), but with a high biodegradation inhibition after the treatments. Dry biomass (g VS) content was determined at three different heights of the biofilter in order to carry out each experiment under the same conditions. The same amount of dry biomass when applying a treatment was established so it could be considered that the biofilm conditions were identical. Wet biomass was used as a control of the biofilter's water content during treatments. Several batch assays were performed to support and quantify the observed inhibitory effects of the different chemicals and temperatures applied. |
| Databáze: | OpenAIRE |
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