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Author (up) Crutchik, D.; Morales, N.; Vazquez-Padin, J.R.; Garrido, J.M.
Title Enhancement of struvite pellets crystallization in a fullscale plant using an industrial grade magnesium product Type
Year 2017 Publication Water Science And Technology Abbreviated Journal Water Sci. Technol.
Volume 75 Issue 3 Pages 609-618
Keywords industrial magnesium hydroxide; municipal wastewater; phosphorus recovery; struvite pellets
Abstract 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.
Address [Crutchik, D.; Garrido, J. M.] Univ Santiago de Compostela, Inst Technol, Dept Chem Engn, Santiago De Compostela 15782, Spain, Email: dafne.crutchik@gmail.com
Corporate Author Thesis
Publisher Iwa Publishing Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0273-1223 ISBN Medium
Area Expedition Conference
Notes WOS:000394350100013 Approved
Call Number UAI @ eduardo.moreno @ Serial 710
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Author (up) Crutchik, D.; Rodrigues, S.; Ruddle, D.; Garrido, J.M.
Title Evaluation of a low-cost magnesium product for phosphorus recovery by struvite crystallization Type
Year 2018 Publication Journal Of Chemical Technology And Biotechnology Abbreviated Journal J. Chem. Technol. Biotechnol.
Volume 93 Issue 4 Pages 1012-1021
Keywords continuous stirred tank reactor; fluidized bed reactor; industrial magnesium hydroxide; phosphorus recovery; struvite
Abstract BACKGROUND: The development of a cost-effective process of struvite crystallization requires the selection of appropriate sources of alkali and magnesium. In this study, the effectiveness of two industrial grade products, MgO and Mg(OH)(2), as magnesium and alkali sources to recover phosphorus as struvite were investigated and compared in a first set of experiments. Subsequently, the use of industrial Mg(OH)(2) was compared in two different struvite crystallization systems, an upflow fluidized bed reactor (FBR) and a continuous stirred tank reactor (CSTR) coupled to a settler tank. RESULTS: At the same operational conditions, the consumption of MgO was higher than Mg(OH)(2) consumption. Moreover, industrial Mg(OH)(2) consumption for FBR and the CSTR operation was 1.6 and 1.1 1 mol Mg added mol(-1) P precipitated, respectively. This difference was caused by the high mixing intensity and the higher contact time between the Mg(OH)(2) slurry and the influent in the CSTR, favouring the conversion. CONCLUSIONS: Both industrial grade magnesium products are promising options for struvite crystallization. However, Mg(OH)(2) was more effective than the starting material, MgO, to recover phosphorus. Struvite crystallization by adding an industrial grade Mg(OH)(2) could be economically viable with regard to alternative physico-chemical P removal processes using metal salts, increasing the attractiveness of this P recovery process. (C) 2017 Society of Chemical Industry.
Address [Crutchik, Dafne] Univ Adolfo Ibanez, Fac Engn & Sci, Diagonal Las Torres 2640, Santiago, Chile, Email: dafne.crutchik@uai.cl
Corporate Author Thesis
Publisher Wiley Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0268-2575 ISBN Medium
Area Expedition Conference
Notes WOS:000426859900010 Approved
Call Number UAI @ eduardo.moreno @ Serial 847
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