Biodrying of dewatered secondary sludge: behavior of dynamic respiration index (DRI) and energy release under different operating conditions
Abstract
BACKGROUND Biological activity monitored through the dynamic respiration index (DRI) and the calculation of biological heat generation (Q(bio)) through O-2 consumption has been reported only scarcely in the case of biodrying. Therefore, the present work studies the DRI and Q(bio) for a dewatered secondary sewage sludge biodrying process under different operating conditions: airflow rate (AFR) and initial moisture content (IMC). RESULTS It was found that AFR has an important effect on oxygen consumption, with higher DRI (<= 6 gO(2) kgVS(-1) h(-1)) at higher AFR for different studied IMCs. IMC also affects the DRI, with higher values of DRI at higher IMC. Determination of the Q(bio) indicated that its calculation through O-2 consumption provided better explanations of the water removal of the process. AFR also affects water removal and volatile solids (VS) degradation, with greater water removal (c. 30%) and lower VS degradation (c. 3.6%) at lower AFR. CONCLUSIONS AFR strongly affects the DRI, with higher DRI at low AFR. The calculation of Q(bio) through O-2 consumption is recommended. (c) 2019 Society of Chemical Industry
Más información
Título según WOS: | Biodrying of dewatered secondary sludge: behavior of dynamic respiration index (DRI) and energy release under different operating conditions |
Título según SCOPUS: | Biodrying of dewatered secondary sludge: behavior of dynamic respiration index (DRI) and energy release under different operating conditions |
Título de la Revista: | JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY |
Volumen: | 95 |
Número: | 1 |
Editorial: | John Wiley & Sons Ltd. |
Fecha de publicación: | 2020 |
Página de inicio: | 94 |
Página final: | 101 |
Idioma: | English |
DOI: |
10.1002/JCTB.6210 |
Notas: | ISI, SCOPUS |