Biodrying of dewatered secondary sludge: behavior of dynamic respiration index (DRI) and energy release under different operating conditions | Zendy

Huiliñir César | Zendy; Leiva Estefanía | Zendy; Stegmaier Francisco | Zendy; Castillo Antonio | Zendy; Cottet Luis | Zendy; Montalvo Silvio | Zendy

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Biodrying of dewatered secondary sludge: behavior of dynamic respiration index (DRI) and energy release under different operating conditions

Author(s) -

Huiliñir César,

Leiva Estefanía,

Stegmaier Francisco,

Castillo Antonio,

Cottet Luis,

Montalvo Silvio

Publication year - 2020

Publication title -

journal of chemical technology and biotechnology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.64

H-Index - 117

eISSN - 1097-4660

pISSN - 0268-2575

DOI - 10.1002/jctb.6210

Subject(s) - sewage sludge , water content , moisture , respiration , environmental science , oxygen , environmental engineering , degradation (telecommunications) , energy consumption , pulp and paper industry , chemistry , sewage , environmental chemistry , botany , geotechnical engineering , organic chemistry , engineering , biology , telecommunications , ecology , computer science

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 kg VS –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. © 2019 Society of Chemical Industry

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