Aeration pre-treatment role in improving the performance of bio-conditioning dewatering of food waste anaerobic digestate

Bibliographische Detailangaben
Veröffentlicht in:	Waste management (New York, N.Y.). - 1999. - 177(2024) vom: 01. März, Seite 298-306
1. Verfasser:	Zhou, Bo (VerfasserIn)
Weitere Verfasser:	Zhao, Guangliang, Yan, Cheng, Dong, Yan, Wang, Dianzhan, Liang, Jianru, Zhang, Mingjiang, Zhang, Dejin, Zhou, Yujun, Li, Jiansheng, Zhou, Lixiang
Format:	Online-Aufsatz
Sprache:	English
Veröffentlicht:	2024
Zugriff auf das übergeordnete Werk:	Waste management (New York, N.Y.)
Schlagworte:	Journal Article Aeration pre-treatment Anaerobic digestate Bio-conditioning dewatering Flocculation Food waste Food Loss and Waste

Beschreibung
Zusammenfassung:	Copyright © 2024 Elsevier Ltd. All rights reserved. Bio-conditioning dewatering followed by activated sludge process (BDAS) is a promising technology for purifying food waste anaerobic digestate (FWAD). However, the bio-conditioning dewatering efficiency is often affected by FWAD properties and ambient temperature. Here, we firstly reported that aeration pre-treatment of FWAD played an important role in improving the bio-conditioning dewatering performance of FWAD. The study found that the accumulated carbonate (CO32-) in FWAD severely affected the flocculation of Fe-containing flocculant formed in microbial fermentation liquor due to the competitive consumption of the flocculant by CO32-. The capillary suction time (CST) and specific resistance to filtration (SRF) of the bio-conditioned FWAD increased from initial 77.8 s and 2.0 × 1012 m/kg to 122.7 s and 3.4 × 1012 m/kg, respectively, within 1 day of aeration. Prolonged aeration pre-treatment of FWAD could reduce its CO32- concentration and total alkalinity. Additionally, the aeration pre-treatment simultaneously decreased the proportion of macromolecular organic matter that hindered dewatering and the content of total solids (TS) and hydrophilic protein-like substances in FWAD. After 20 days of aeration followed by bio-conditioning, the CST and SRF reduced to final 36.5 s and 2.3 × 1011 m/kg, respectively, indicating a substantial improvement in dewatering performance. Successive forced aeration combined with the addition of CaCl2 to eliminate adverse factors mainly CO32- was a feasible and cost-effective strategy to realize bio-conditioning dewatering of FWAD in less than 2 days and a lower reagents dose of bio-conditioning, which was helpful in the engineering application of the novel BDAS process for FWAD purification
Beschreibung:	Date Completed 04.03.2024 Date Revised 04.03.2024 published: Print-Electronic Citation Status MEDLINE
ISSN:	1879-2456
DOI:	10.1016/j.wasman.2024.02.015