A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Understanding Nitrogen and Phosphorus Leaching from Compost Addition to Bioretention Media
https://orcid.org/0000-0002-4384-9253
https://orcid.org/0000-0002-8076-5593
https://orcid.org/0000-0001-7818-1890
Bioretention is a popular stormwater control measure (SCM) with limited information regarding the impact of compost addition to the media. Although compost combined with bioretention soil media (BSM) has the potential for increased pollutant removal and water storage, it also may leach harmful nutrients. This project analyzes the effects of incorporating two forms of compost, biosolids-derived and green waste–derived, at two compost-BSM ratios, on bioretention nutrients performance; addition of aluminum-based water treatment residual (WTR) was also evaluated. Bioretention mesocosm column studies compared leaching/removal effects of a standard BSM (sand, topsoil, and hardwood mulch) and BSM mixed with 15% and 30% compost (biosolids and green waste) as well as 30% tap water–washed biosolids compost and 15% green-waste compost + WTR. Synthetic stormwater was applied to the columns and the effluent was analyzed for total nitrogen (TN), total phosphorus (TP), and their speciation. All compost-amended columns leached greater TN (2.1-fold to 67-fold) and TP (2.8-fold to 19-fold) concentrations than BSM-only, with biosolids compost leaching the most nutrients. This was largely due to greater nutrients exported within the initial flush, but also due to the continued mineralization of compost organic matter, resulting in constant leaching and 2-fold to 21-fold greater TN and 1.3-fold to 28-fold greater TP than BSM. Initial washout of compost fines contributed to nutrients in the bioretention discharge. Based on results from this study, addition of compost to BSM is not recommended. Unamended BSM produced the most nutrient removal from input stormwater.
Understanding Nitrogen and Phosphorus Leaching from Compost Addition to Bioretention Media
https://orcid.org/0000-0002-4384-9253
https://orcid.org/0000-0002-8076-5593
https://orcid.org/0000-0001-7818-1890
Bioretention is a popular stormwater control measure (SCM) with limited information regarding the impact of compost addition to the media. Although compost combined with bioretention soil media (BSM) has the potential for increased pollutant removal and water storage, it also may leach harmful nutrients. This project analyzes the effects of incorporating two forms of compost, biosolids-derived and green waste–derived, at two compost-BSM ratios, on bioretention nutrients performance; addition of aluminum-based water treatment residual (WTR) was also evaluated. Bioretention mesocosm column studies compared leaching/removal effects of a standard BSM (sand, topsoil, and hardwood mulch) and BSM mixed with 15% and 30% compost (biosolids and green waste) as well as 30% tap water–washed biosolids compost and 15% green-waste compost + WTR. Synthetic stormwater was applied to the columns and the effluent was analyzed for total nitrogen (TN), total phosphorus (TP), and their speciation. All compost-amended columns leached greater TN (2.1-fold to 67-fold) and TP (2.8-fold to 19-fold) concentrations than BSM-only, with biosolids compost leaching the most nutrients. This was largely due to greater nutrients exported within the initial flush, but also due to the continued mineralization of compost organic matter, resulting in constant leaching and 2-fold to 21-fold greater TN and 1.3-fold to 28-fold greater TP than BSM. Initial washout of compost fines contributed to nutrients in the bioretention discharge. Based on results from this study, addition of compost to BSM is not recommended. Unamended BSM produced the most nutrient removal from input stormwater.
Understanding Nitrogen and Phosphorus Leaching from Compost Addition to Bioretention Media
https://orcid.org/0000-0002-4384-9253
https://orcid.org/0000-0002-8076-5593
https://orcid.org/0000-0001-7818-1890
Bioretention is a popular stormwater control measure (SCM) with limited information regarding the impact of compost addition to the media. Although compost combined with bioretention soil media (BSM) has the potential for increased pollutant removal and water storage, it also may leach harmful nutrients. This project analyzes the effects of incorporating two forms of compost, biosolids-derived and green waste–derived, at two compost-BSM ratios, on bioretention nutrients performance; addition of aluminum-based water treatment residual (WTR) was also evaluated. Bioretention mesocosm column studies compared leaching/removal effects of a standard BSM (sand, topsoil, and hardwood mulch) and BSM mixed with 15% and 30% compost (biosolids and green waste) as well as 30% tap water–washed biosolids compost and 15% green-waste compost + WTR. Synthetic stormwater was applied to the columns and the effluent was analyzed for total nitrogen (TN), total phosphorus (TP), and their speciation. All compost-amended columns leached greater TN (2.1-fold to 67-fold) and TP (2.8-fold to 19-fold) concentrations than BSM-only, with biosolids compost leaching the most nutrients. This was largely due to greater nutrients exported within the initial flush, but also due to the continued mineralization of compost organic matter, resulting in constant leaching and 2-fold to 21-fold greater TN and 1.3-fold to 28-fold greater TP than BSM. Initial washout of compost fines contributed to nutrients in the bioretention discharge. Based on results from this study, addition of compost to BSM is not recommended. Unamended BSM produced the most nutrient removal from input stormwater.
Understanding Nitrogen and Phosphorus Leaching from Compost Addition to Bioretention Media
J. Sustainable Water Built Environ.
Owen, Dylan C. (author) / Gardina, Colleen (author) / Ostrom, Travis K. (author) / Davis, Allen P. (author)
2023-05-01
Article (Journal)
Electronic Resource
English
| ASCE | 2017
Bioretention with Shallow Fill Media
| British Library Conference Proceedings | 2013
Bioretention with Shallow Fill Media
| British Library Conference Proceedings | 2013