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- W3040989867 abstract "A system dynamics modeling approach was used to assess the potential impact of intentional struvite crystallization recovery on wastewater treatment plant (WWTP) allocation of N and P in effluent and biosolids outputs. Struvite crystallization has been used to recover wastewater N and P and produce valuable fertilizer. However, it is often overlooked whether additional benefits may be realized by diverting N and P from other fates. A system dynamics model was used with operational data from three activated-sludge WWTPs in North Florida. Incorporating struvite crystallization reduced the effluent P load by 37 to 100%, dependent upon the WWTP. This may translate into substantial savings for systems facing severe restrictions in effluent P release outside the plant. Additionally, biosolids P load reductions ranged from 17 to 46%. The model also predicted a 37% average increase in the biosolids N:P ratio. Increasing the N:P ratio may allow for greater biosolids land-application rates where P fertilizer restrictions exist. In comparison, the N load reductions were much less dramatic, i.e. below 10% reduction from the effluent and 14% from the biosolids. Most N inputs into an activated-sludge type WWTP are likely lost through denitrification during wastewater processing and struvite does not appear to be a significant means of recovering N from small WWTPs. However, incorporating struvite recovery into even the simplest WWTPs reduces effluent post-treatment needs and results in a more useful biosolids product." @default.
- W3040989867 created "2020-07-16" @default.
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- W3040989867 date "2020-11-01" @default.
- W3040989867 modified "2023-09-27" @default.
- W3040989867 title "Mitigating rural WWTP impacts: System dynamics modeling of downstream nutrient outputs" @default.
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- W3040989867 doi "https://doi.org/10.1016/j.scitotenv.2020.140809" @default.
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