Favorable Operating Conditions for Obtaining High-Value Struvite Product from Sludge Dewatering Filtrate
| Autor: | Chaim Sheindorf, Mario Kummel, Menachem Rebhun, Somaya Phalah, Ori Lahav, Beni Lew |
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| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | Environmental Engineering Science. 27:733-741 |
| ISSN: | 1557-9018 1092-8758 |
| DOI: | 10.1089/ees.2009.0279 |
| Popis: | Struvite (MgNH4PO4) is emerging as a potential fertilization product for agriculture. As other phosphate minerals that can be precipitated from wastewater are known to have lower value as fertilizers, the overall fertilization quality of the solids precipitated in struvite recovery systems depends largely on the percentage of struvite in the mixture of precipitated solids. This work focused on determining the most appropriate operating conditions (with a focus on pH and hydraulic retention time [HRT]) for removing >90% of the dissolved phosphate and, at the same time, attaining a precipitate with the highest possible struvite content from typical filtrates of sludge dewatering belt press systems. To this end, a continuous laboratory-scale completely mixed reactor was operated at different pH values and HRTs and the precipitant composition was determined. Theoretical calculations showed that the most cost-effective MgCl2 dosage to typical Israeli belt press filtrate is ∼10 mM. Using this dosage, ∼... |
| Databáze: | OpenAIRE |
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