TY - JOUR
T1 - Enhancement of struvite pellets crystallization in a full-scale plant using an industrial grade magnesium product
AU - Crutchik, D.
AU - Morales, N.
AU - Vázquez-Padín, J. R.
AU - Garrido, J. M.
N1 - Publisher Copyright:
© IWA Publishing 2017.
PY - 2017/2
Y1 - 2017/2
N2 - A full-scale struvite crystallization system was operated for the treatment of the centrate obtained from the sludge anaerobic digester in a municipal wastewater treatment plant. Additionally, the feasibility of an industrial grade Mg(OH)2 as a cheap magnesium and alkali source was also investigated. The struvite crystallization plant was operated for two different periods: period I, in which an influent with low phosphate concentration (34.0 mg P·L-1) was fed to the crystallization plant; and period II, in which an influent with higher phosphate concentration (68.0 mg P·L-1) was used. A high efficiency of phosphorus recovery by struvite crystallization was obtained, even when the effluent treated had a high level of alkalinity. Phosphorus recovery percentage was around 77%, with a phosphate concentration in the effluent between 10.0 and 30.0 mg P·L-1. The experiments gained struvite pellets of 0.5-5.0 mm size. Moreover, the consumption of Mg(OH)2 was estimated at 1.5 mol Mg added·mol P recovered-1. Thus, industrial grade Mg(OH)2 can be an economical alternative as magnesium and alkali sources for struvite crystallization at industrial scale.
AB - A full-scale struvite crystallization system was operated for the treatment of the centrate obtained from the sludge anaerobic digester in a municipal wastewater treatment plant. Additionally, the feasibility of an industrial grade Mg(OH)2 as a cheap magnesium and alkali source was also investigated. The struvite crystallization plant was operated for two different periods: period I, in which an influent with low phosphate concentration (34.0 mg P·L-1) was fed to the crystallization plant; and period II, in which an influent with higher phosphate concentration (68.0 mg P·L-1) was used. A high efficiency of phosphorus recovery by struvite crystallization was obtained, even when the effluent treated had a high level of alkalinity. Phosphorus recovery percentage was around 77%, with a phosphate concentration in the effluent between 10.0 and 30.0 mg P·L-1. The experiments gained struvite pellets of 0.5-5.0 mm size. Moreover, the consumption of Mg(OH)2 was estimated at 1.5 mol Mg added·mol P recovered-1. Thus, industrial grade Mg(OH)2 can be an economical alternative as magnesium and alkali sources for struvite crystallization at industrial scale.
KW - Industrial magnesium hydroxide
KW - Municipal wastewater
KW - Phosphorus recovery
KW - Struvite pellets
UR - http://www.scopus.com/inward/record.url?scp=85017253184&partnerID=8YFLogxK
U2 - 10.2166/wst.2016.527
DO - 10.2166/wst.2016.527
M3 - Article
C2 - 28192355
AN - SCOPUS:85017253184
SN - 0273-1223
VL - 75
SP - 609
EP - 618
JO - Water Science and Technology
JF - Water Science and Technology
IS - 3
ER -