Towards energy positive wastewater treatment by sludge treatment using free nitrous acid

Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)1869-1873
Journal / PublicationChemosphere
Volume144
Publication statusPublished - 1 Feb 2016
Externally publishedYes

Link(s)

DOI

DOI
Check@CityULib
Link to Scopus https://www.scopus.com/record/display.uri?eid=2-s2.0-84953775632&origin=recordpage
Permanent Link https://scholars.cityu.edu.hk/en/publications/publication(bb9142de-9b18-4736-9288-f8d4e011a4a7).html

Abstract

Free nitrous acid (FNA i.e. HNO2) was revealed to be effective in enhancing biodegradability of secondary sludge. Also, nitrite-oxidizing bacteria were found to be more susceptible to FNA than ammonium-oxidizing bacteria. Based on these findings, a novel FNA-based sludge treatment technology is proposed to enhance energy recovery from wastewater/sludge. Energy analysis indicated that the FNA-based technology would make wastewater treatment become an energy generating process (yielding energy at 4 kWh/PE/y; kWh/PE/y: kilowatt hours per population equivalent per year), rather than being a large energy consumer that it is today (consuming energy at 24 kWh/PE/y). Importantly, FNA required for the sludge treatment could be produced as a by-product of wastewater treatment. This proposed FNA-based technology is economically and environmentally attractive, and can be easily implemented in any wastewater treatment plants. It only involves the installation of a simple sludge mixing tank. This article presents the concept of the FNA-based technology. © 2015 Elsevier Ltd.

Research Area(s)

  • Energy recovery, Free nitrous acid, Methane, Nitrite pathway, Sludge treatment

Bibliographic Note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to lbscholars@cityu.edu.hk.

Citation Format(s)

[ RIS ] [ BibTeX ]
Towards energy positive wastewater treatment by sludge treatment using free nitrous acid. / Wang, Qilin; Hao, Xiaodi; Yuan, Zhiguo.
In: Chemosphere, Vol. 144, 01.02.2016, p. 1869-1873.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review