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Feasibility of phosphate precipitation from digested anaerobic sludge in a continuous aerated reactor
Year:
2016
Source of publication :
Desalination and Water Treatment
Authors :
Lew, Beni
;
.
Yudachev, Vladimir
;
.
Volume :
57
Co-Authors:

Abid Ali Khan

Facilitators :
From page:
24450
To page:
24455
(
Total pages:
6
)
Abstract:

This study investigates the effectiveness of a complete stirred and aerated reactor for deliberate phosphate precipitation as struvite from anaerobic sludge in a domestic wastewater treatment plant and, to achieve the optimum operational conditions in order to reduce the potential formation of struvite downstream of the digester and decrease the phosphate (P) and nitrogen (N) load on the treatment plant. The reactor was fed with anaerobic sludge and operated at different hydraulic retention times (HRT) and aeration rates. Theoretical calculations indicated that a minimum pH of 7.5 would be necessary to attain struvite precipitation to its potential. To reach this pH value, a minimum HRT of 1.0 h with aeration flow rate of 46.7 m3 air/h/m3 reactor was necessary. Struvite precipitation kinetics were observed to be much faster than other minerals that can precipitate and a decrease in HRT promotes a precipitate richer in struvite. An increase in the HRT to 2.0 h, for the same aeration rate led to a higher phosphate precipitation with calcium. However, for all HRT and air flows studied, the precipitate obtained can be considered to be poor in struvite (maximum 0.72 mmol/l) and it was responsible for around only 4 and 0.5% decrease in the phosphate and ammonia load on the plant, respectively.

Note:
Related Files :
aeration rate
Anaerobic sludge
hydraulic retention time
pH
struvite
wastewater treatment
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More details
DOI :
https://doi.org/10.1080/19443994.2016.1140085
Article number:
0
Affiliations:
Database:
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
55899
Last updated date:
02/03/2022 17:27
Creation date:
15/08/2021 14:20
Scientific Publication
Feasibility of phosphate precipitation from digested anaerobic sludge in a continuous aerated reactor
57

Abid Ali Khan

Feasibility of phosphate precipitation from digested anaerobic sludge in a continuous aerated reactor

This study investigates the effectiveness of a complete stirred and aerated reactor for deliberate phosphate precipitation as struvite from anaerobic sludge in a domestic wastewater treatment plant and, to achieve the optimum operational conditions in order to reduce the potential formation of struvite downstream of the digester and decrease the phosphate (P) and nitrogen (N) load on the treatment plant. The reactor was fed with anaerobic sludge and operated at different hydraulic retention times (HRT) and aeration rates. Theoretical calculations indicated that a minimum pH of 7.5 would be necessary to attain struvite precipitation to its potential. To reach this pH value, a minimum HRT of 1.0 h with aeration flow rate of 46.7 m3 air/h/m3 reactor was necessary. Struvite precipitation kinetics were observed to be much faster than other minerals that can precipitate and a decrease in HRT promotes a precipitate richer in struvite. An increase in the HRT to 2.0 h, for the same aeration rate led to a higher phosphate precipitation with calcium. However, for all HRT and air flows studied, the precipitate obtained can be considered to be poor in struvite (maximum 0.72 mmol/l) and it was responsible for around only 4 and 0.5% decrease in the phosphate and ammonia load on the plant, respectively.

Scientific Publication
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