Steel slag assists potassium ferrate to improve SCFAs production from anaerobic sludge fermentation

Yali Wang; Xianglong Yang; Hang Li; Lei Zhu; Hongjie Wang

doi:10.1016/j.jenvman.2023.117996

Steel slag assists potassium ferrate to improve SCFAs production from anaerobic sludge fermentation

J Environ Manage. 2023 Aug 15:340:117996. doi: 10.1016/j.jenvman.2023.117996. Epub 2023 Apr 21.

Authors

Yali Wang¹, Xianglong Yang², Hang Li², Lei Zhu², Hongjie Wang³

Affiliations

¹ Hebei Key Laboratory of Close-to-Nature Restoration Technology of Wetlands, Hebei University, Baoding, 071002, China; School of Eco-Environment, Hebei University, Baoding, 071002, China; Institute of Xiong'an New Area, Hebei University, Baoding, 071002, China; School of Life Science, Hebei University, Baoding, 071002, China.
² Hebei Key Laboratory of Close-to-Nature Restoration Technology of Wetlands, Hebei University, Baoding, 071002, China; School of Eco-Environment, Hebei University, Baoding, 071002, China; Institute of Xiong'an New Area, Hebei University, Baoding, 071002, China.
³ Hebei Key Laboratory of Close-to-Nature Restoration Technology of Wetlands, Hebei University, Baoding, 071002, China; School of Eco-Environment, Hebei University, Baoding, 071002, China; Institute of Xiong'an New Area, Hebei University, Baoding, 071002, China; School of Life Science, Hebei University, Baoding, 071002, China. Electronic address: wanghj@hbu.edu.cn.

PMID: 37087889
DOI: 10.1016/j.jenvman.2023.117996

Abstract

Potassium ferrate (PF) pretreatment in anaerobic sludge and its potential influence mechanisms have received widely attention. This study investigated the coupling effect of PF loading on steel slag (SS) on excess sludge anaerobic fermentation. Results showed that SS loading increase the treatment performance of PF on short chain volatile fatty acids (SCFAs) production from anaerobic fermented sludge. It was showed that the modified PF loaded SS (MPF-SS) promoted the dissolution and release of organic substrates from intracellular to extracellular. Further exploration showed the promotion of PF and MPF-SS exposure to acid production microorganisms was much more than that to acid consumption microorganisms. MPF-SS addition can also effectively reinforce the carbohydrate transport, amino acid metabolism and the key enhanced genes associated with fatty acid biosynthesis pathways. This study fills the knowledge gap about modified PF on sludge treatment and also expands a new perspective for its application for sludge resource recovery.

Keywords: Anaerobic fermentation; Fermentation functional bacteria; Ferrate pretreatment; Metagenomics; Short chain fatty acid.

MeSH terms

Anaerobiosis
Fatty Acids, Volatile
Fermentation
Hydrogen-Ion Concentration
Sewage* / chemistry
Steel*

Substances

Sewage
potassium ferrate
Steel
Fatty Acids, Volatile