Please use this identifier to cite or link to this item:
https://hdl.handle.net/2445/158438
Title: | Assessing the usefulness of clostridia spores for evaluating sewage sludge hygienization |
Author: | Martín Díaz, Julia Ruiz Hernando, María Astals Garcia, Sergi Lucena Gutiérrez, Francisco |
Keywords: | Clostridi Bacteris patògens Indicadors biològics Llots de depuradora Clostridium Pathogenic bacteria Indicators (Biology) Sewage sludge |
Issue Date: | Feb-2017 |
Publisher: | Elsevier B.V. |
Abstract: | The capability of clostridia spores to act as pathogen indicators in sewage sludge treatment was investigated. Sulfite-reducing clostridia and E. coli levels were monitored during waste activated sludge pre-treatments (alkali and ultrasound) and its subsequent mesophilic anaerobic digestion. E. coli was maintained or reduced depending on treatment type and intensity. However, alkali pre-treatment (35.3 gNaOH/kg TS) by itself and alkali (157 gNaOH/kg TS) and ultrasound (27,000 kJ/kg TS) pre-treatments followed by anaerobic digestion provoked reproducible clostridia increases. Specifically, up to 2.7 log10 after 35.3 gNaOH/kg TS pre-treatment and up to 1.9 and 1.1 log10 after digesting the 157 gNaOH/kg TS and 27,000 kJ/kg TS pre-treated sludge, respectively. Having rejected the hypotheses of sporulation and floc dissipation, the most plausible explanation for these clostridia increases is re-growth. These results question the suitability of clostridia spores as indicators of sludge treatment and other biological treatments where clostridia may have a role. |
Note: | Versió postprint del document publicat a: https://doi.org/10.1016/j.biortech.2016.11.075 |
It is part of: | Bioresource Technology, 2017, vol. 225, p. 286-292 |
URI: | https://hdl.handle.net/2445/158438 |
Related resource: | https://doi.org/10.1016/j.biortech.2016.11.075 |
ISSN: | 0960-8524 |
Appears in Collections: | Articles publicats en revistes (Genètica, Microbiologia i Estadística) |
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