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Filter Media Additives for Phosphorus Removal (view source)
Revision as of 14:51, 19 August 2025
, 3 months ago→Overview
[[File:Screenshot 2025-08-19 093748.png|250px|thumb|right|link=https://sustainabletechnologies.ca/app/uploads/2019/06/improving-nutrient-retention-in-bioretention-tech-brief.pdf|Click on the image to read STEP's report on improving nutrient retention in bioretention (STEP, 2019)<ref name = "STEP 2019">STEP. 2019. Improving nutrient retention in bioretention. Technical Brief. Accessed: https://sustainabletechnologies.ca/app/uploads/2019/06/improving-nutrient-retention-in-bioretention-tech-brief.pdf</ref>.]]
[[File:Screenshot 2025-08-19 093748.png|250px|thumb|right|link=https://sustainabletechnologies.ca/app/uploads/2019/06/improving-nutrient-retention-in-bioretention-tech-brief.pdf|Click on the image to read STEP's report on improving nutrient retention in bioretention (STEP, 2019)<ref name = "STEP 2019">STEP. 2019. Improving nutrient retention in bioretention. Technical Brief. Accessed: https://sustainabletechnologies.ca/app/uploads/2019/06/improving-nutrient-retention-in-bioretention-tech-brief.pdf</ref>.]]
==Overview==
==Overview==
[[File:Screenshot 2025-08-19 101828.png|400px|thumb|right|Study site location at Kortright showing the locations of the different media amendments used (STEP, 2019)<ref name = "STEP 2019"></ref>.]]
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Design innovations to improve water quality treatment performance of filter media mixtures involve the incorporation of additives to enhance retention of reactive or dissolved pollutants, such as [[Phosphorus|phosphorus]]. A number of granular amendments have been demonstrated to improve nutrient removal from discharge water in BMPs such as [[bioretention]] systems, [[stormwater planters]], [[absorbent landscapes]], [[sand filters]] or [[green roofs]].
Design innovations to improve water quality treatment performance of filter media mixtures involve the incorporation of additives to enhance retention of reactive or dissolved pollutants, such as [[Phosphorus|phosphorus]]. A number of granular amendments have been demonstrated to improve nutrient removal from discharge water in BMPs such as [[bioretention]] systems, [[stormwater planters]], [[absorbent landscapes]], [[sand filters]] or [[green roofs]].
There are two primary processes involved, chemical precipitation and adsorption. Both mechanisms are ultimately finite, but have been shown in some cases to make significant improvements on the discharged water quality over several years. For instance, a two year STEP research study that compared standard bioretention media, to the same media amended with Sorbtive™ in one plot and iron enriched sand (aka red sand) in another showed statistically significant improvements in effluent phosphorus concentrations from the two media amended plots (STEP, 2019)<ref name = "STEP 2019"></ref>.
There are two primary processes involved, chemical precipitation and adsorption. Both mechanisms are ultimately finite, but have been shown in some cases to make significant improvements on the discharged water quality over several years. For instance, a two year STEP research study that compared standard bioretention media, to the same media amended with Sorbtive™ in one plot and iron enriched sand (aka red sand) in another showed statistically significant improvements in effluent phosphorus concentrations from the two media amended plots (STEP, 2019)<ref name = "STEP 2019"></ref>.