Feasibility of phosphate precipitation from digested anaerobic sludge in a continuous aerated reactor
| Autor: | Abid Khan, Vladimir Yudachev, Beni Lew |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Hydraulic retention time
Precipitation (chemistry) 0208 environmental biotechnology Environmental engineering chemistry.chemical_element Ocean Engineering 02 engineering and technology 010501 environmental sciences Phosphate 01 natural sciences Pollution Nitrogen 020801 environmental engineering Volumetric flow rate chemistry.chemical_compound chemistry Struvite Sewage treatment Aeration 0105 earth and related environmental sciences Water Science and Technology |
| Zdroj: | Desalination and Water Treatment. 57:24450-24455 |
| ISSN: | 1944-3986 1944-3994 |
| DOI: | 10.1080/19443994.2016.1140085 |
| Popis: | This study investigates the effectiveness of a complete stirred and aerated reactor for deliberate phosphate precipitation as struvite from anaerobic sludge in a domestic wastewater treatment plant and, to achieve the optimum operational conditions in order to reduce the potential formation of struvite downstream of the digester and decrease the phosphate (P) and nitrogen (N) load on the treatment plant. The reactor was fed with anaerobic sludge and operated at different hydraulic retention times (HRT) and aeration rates. Theoretical calculations indicated that a minimum pH of 7.5 would be necessary to attain struvite precipitation to its potential. To reach this pH value, a minimum HRT of 1.0 h with aeration flow rate of 46.7 m3 air/h/m3 reactor was necessary. Struvite precipitation kinetics were observed to be much faster than other minerals that can precipitate and a decrease in HRT promotes a precipitate richer in struvite. An increase in the HRT to 2.0 h, for the same aeration rate led to a h... |
| Databáze: | OpenAIRE |
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