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Cited by 267

The DOI matches its Crossref record; 22 of the 22 references it cites were found in a registry or an index.

Free Nitrous Acid (FNA)-Based Pretreatment Enhances Methane Production from Waste Activated Sludge

Wang, Qilin, Ye, Liu, Jiang, Guangming, Jensen, Paul D., Batstone, Damien J., Yuan, Zhiguo·2013·Environmental Science & Technology

Abstract

Anaerobic digestion of waste activated sludge (WAS) is currently enjoying renewed interest due to the potential for methane production. However, methane production is often limited by the slow hydrolysis rate and/or poor methane potential of WAS. This study presents a novel pretreatment strategy based on free nitrous acid (FNA or HNO2) to enhance methane production from WAS. Pretreatment of WAS for 24 h at FNA concentrations up to 2.13 mg N/L substantially enhanced WAS solubilization, with the highest solubilization (0.16 mg chemical oxygen demand (COD)/mg volatile solids (VS), at 2.13 mg HNO2-N/L) being six times that without FNA pretreatment (0.025 mg COD/mg VS, at 0 mg HNO2-N/L). Biochemical methane potential tests demonstrated methane production increased with increased FNA concentration used in the pretreatment step. Model-based analysis indicated FNA pretreatment improved both hydrolysis rate and methane potential, with the highest improvement being approximately 50% (from 0.16 to 0.25 d(-1)) and 27% (from 201 to 255 L CH4/kg VS added), respectively, achieved at 1.78-2.13 mg HNO2-N/L. Further analysis indicated that increased hydrolysis rate and methane potential were related to an increase in rapidly biodegradable substrates, which increased with increased FNA dose, while the slowly biodegradable substrates remained relatively static.

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Crossref · 10.1021/es402933b

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Metadata

Authors
Wang, Q., Ye, L., Jiang, G., Jensen, P. D., Batstone, D. J., & Yuan, Z.
Venue
Environmental Science & Technology
Published
2013-09-27
Volume
47
Issue
20
Pages
11897-11904
ISSN
  • 0013-936X (ISSN-L)
  • 1520-5851
OpenAlex
W1970091067
Cited by
267
References
22
FWCI
32.92
Type
journal article
Language
en
Open access
closed

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