Enhancing post aerobic digestion of full-scale anaerobically digested sludge using free nitrous acid pretreatment

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

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Author(s)

  • Qilin Wang
  • Xu Zhou
  • Lai Peng
  • Dongbo Wang
  • Guo-Jun Xie

Detail(s)

Original languageEnglish
Pages (from-to)152-158
Journal / PublicationChemosphere
Volume150
Publication statusPublished - 1 May 2016
Externally publishedYes

Link(s)

DOI

DOI
Check@CityULib
Link to Scopus https://www.scopus.com/record/display.uri?eid=2-s2.0-84960911503&origin=recordpage
Permanent Link https://scholars.cityu.edu.hk/en/publications/publication(ef2feffd-6faa-4d10-ad3b-25577a330f6f).html

Abstract

Post aerobic digestion of anaerobically digested sludge (ADS) has been extensively applied to the wastewater treatment plants to enhance sludge reduction. However, the degradation of ADS in the post aerobic digester itself is still limited. In this work, an innovative free nitrous acid (HNO2 or FNA)-based pretreatment approach is proposed to improve full-scale ADS degradation in post aerobic digester. The post aerobic digestion was conducted by using an activated sludge to aerobically digest ADS for 4 days. Degradations of the FNA-treated (treated at 1.0 and 2.0 mg N/L for 24 h) and untreated ADSs were then determined and compared. The ADS was degraded by 26% and 32%, respectively, in the 4-day post aerobic digestion period while being pretreated at 1.0 and 2.0 mg HNO2-N/L. In comparison, only 20% of the untreated ADS was degraded. Economic analysis demonstrated that the implementation of FNA pretreatment can be economically favourable or not depending on the sludge transport and disposal cost. © 2016 Elsevier Ltd.

Research Area(s)

  • Anaerobically digested sludge, Free nitrous acid, Post aerobic digestion, Sludge degradation

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 ]
Enhancing post aerobic digestion of full-scale anaerobically digested sludge using free nitrous acid pretreatment. / Wang, Qilin; Zhou, Xu; Peng, Lai et al.
In: Chemosphere, Vol. 150, 01.05.2016, p. 152-158.

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