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 - Funding Information:
The authors acknowledge the project Pioneer-STP (ID 199) funded by the WaterWorks2014 Cofunded Call (Water JPI/Horizon 2020). The authors from the University of Santiago de Compostela belong to the Galician Competitive Research Group (GRC 2013-032) programme co-funded by FEDER. The authors gratefully acknowledge the staff of Guillarei WWTP and 'Consorcio de Augas do Louro' for their assistance, the process control and optimization group of the Chemical Engineering Department, UVigo, for the assistance with automation of the plant, and the members of Magnesitas de Rubian that kindly provided the industrial grade magnesium oxide product.
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 -