Phosphorus Recovery and Reuse Using Calcium-Silicate Hydrate Made from Rice Husk
Publication: Journal of Environmental Engineering
Volume 147, Issue 6
Abstract
Calcium silicate hydrate was synthesized from rice husk and used to recover phosphorus from model wastewaters. The phosphorus removal capacity of calcium silicate hydrate was substantially lower in a high alkalinity model animal wastewater ( as at pH 9), compared to deionized water, due to the formation of calcite, which reduced the concentration of free calcium available to react with phosphorus. By gradually decreasing the alkalinity, a proportionate increase in phosphorus uptake was observed, and model wastewaters with alkalinity levels of up to as showed a phosphorus uptake () similar to deionized water with no alkalinity. Phosphorus was extracted from spent calcium silicate hydrate by modified soil phosphorus tests. For calcium silicate hydrate exposed to phosphorus in deionized water, the best recovery was under acidic and alkaline conditions, and for calcium silicate hydrate exposed to phosphorus in high alkalinity model wastewaters, the best phosphorus release was under acid and neutral conditions. The results indicate that calcium silicate hydrate synthesized from rice husk shows promise for phosphorus recovery from wastewaters and subsequent reuse as fertilizer.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This work was supported by the Agriculture and Food Research Initiative (AFRI), Grant No. 2018-67020-27805 from the US Department of Agriculture (USDA) National Institute of Food and Agriculture. The authors thank Anna McClung and Laduska Sells of the USDA Dale Bumpers National Rice Research Center in Stuttgart, Arkansas, for providing the rice straw, Preston Larson for help with SEM analyses, and Andrew Elwood Madden for help with XRD analyses.
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Published In
Journal of Environmental Engineering
Volume 147 • Issue 6 • June 2021
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© 2021 American Society of Civil Engineers.
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Received: Nov 30, 2020
Accepted: Feb 18, 2021
Published online: Mar 26, 2021
Published in print: Jun 1, 2021
Discussion open until: Aug 26, 2021
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