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Enhanced dewaterability of anaerobically digested sewage sludge using Acidithiobacillus ferrooxidans culture as sludge conditioner

Title
Enhanced dewaterability of anaerobically digested sewage sludge using Acidithiobacillus ferrooxidans culture as sludge conditioner
Author
Mayur Bharat Kurade
Keywords
Acidithiobacillus ferrooxidans; Anaerobically digested sewage sludge; Sludge conditioning; Sludge dewaterability
Issue Date
2014-06
Publisher
ELSEVIER SCI LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
Citation
BIORESOURCE TECHNOLOGY, 권: 169, 페이지: 374-379
Abstract
Role of Acidithiobacillus ferrooxidans culture in bioacidification and dewaterability of anaerobically digested sewage sludge (ADS) was investigated. A. ferrooxidans culture grown in 9K medium along with Fe2+ produced iron flocculant containing, secondary iron minerals and biopolymeric substances as confirmed by FT-IR, XRD, and SEM-EDX. Bioacidification of ADS was performed using 10% (v/v) A. ferrooxidans culture, isolated cells and cell-free culture filtrate; and dewaterability was assessed using the capillary suction time (CST) and specific resistance to filtration (SRF). Isolated bacterial cells significantly (P < 0.05) reduced the sludge dewaterability when supplemented with Fe2+ while the whole culture and cell-free filtrate rapidly acidified the sludge without Fe2+ and showed significant reduction of CST (71.3-73.5%) and SRF ( 84-88%). Results clearly indicated that the culture and filtrate of the A. ferrooxidans facilitated rapid sludge dewaterability while the cells supplemented with Fe2+ also enhanced dewaterability but required 2-4 days. (C) 2014 Elsevier Ltd. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0960852414009018?via%3Dihubhttp://hdl.handle.net/20.500.11754/55735
ISSN
0960-8524; 1873-2976
DOI
10.1016/j.biortech.2014.06.057
Appears in Collections:
INDUSTRY-UNIVERSITY COOPERATION FOUNDATION[S](산학협력단) > ETC
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