Enhancing post aerobic digestion of full-scale anaerobically digested sludge using free nitrous acid pretreatment
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
Author(s)
Detail(s)
Original language | English |
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Pages (from-to) | 152-158 |
Journal / Publication | Chemosphere |
Volume | 150 |
Publication status | Published - 1 May 2016 |
Externally published | Yes |
Link(s)
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
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Citation Format(s)
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.
In: Chemosphere, Vol. 150, 01.05.2016, p. 152-158.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review