| Autor: |
Jonathan Chenoweth, Devendra P. Saroj, Roland Clift, Stephen Morse, Pete Pearce, Rosanna Kleemann |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
Resources, Conservation and Recycling. 105:347-359 |
| ISSN: |
0921-3449 |
| Popis: |
P recovery from wastewater treatment plants (WWTPs) as struvite fertiliser is a recognised method of improving P use efficiency and reducing P losses into the environment. The main driver for P recovery from the water industry viewpoint is the reduction in the nuisance of struvite clogging inside pumps and pipes. Struvite recovery leads to an average P recovery rate of 72 ± 7% from centrifuge centrate, with 8.8 ± 0.7% total P and 20.5 ± 3.2% PO4-P removed from the WWTP influent as struvite. This reduces the potential for struvite precipitation, moderates P loads on biological nutrient removal processes and lowers P concentration in the final effluent. Totalling revenue from sale of struvite and operational site savings, P recovery becomes an attractive option for water companies. The implementation of P recovery technologies to produce struvite fertiliser in all UK WWTPs could produce a national P fertiliser source of 7.05 ± 2.01 kt P/year. In addition, sludge produced at WWTPs could be diverted to advanced energy recovery (AER) processes and P recovered from AER residues; up to 21.71 ± 0.95 kt P/year could be recovered in this way in the UK. Combining the two methods of P recovery, UK imports of P fertiliser could be reduced by 36.2 ± 1.1%. P recovery on a large scale has the further benefit of protecting against eutrophication by reducing P emissions to water bodies by 21.7 ± 1.9%. The protection of the environment and reduction in reliance on imported P are major national motivations to legislate P recovery from waste. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect