Additives

From LID SWM Planning and Design Guide
Revision as of 14:39, 8 August 2017 by Jenny Hill (talk | contribs) (Jenny Hill moved page Amendments to Additives without leaving a redirect: Amendments is going to be something else)
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A number of granular amendments have been demonstrated to improve nutrient removal from discharge water in BMPs such as bioretention cells, absorbent landscapes, sand filters or green roofs.

There are two primary processes involved, precipitation and adsorption. Both mechanisms are ultimately finite, but have been shown in come cases to make significant improvements on the discharged water quality over several years.

Soil Amendments
MaterialBenefitsPotential concerns
Biochar-Currently expensive
Energy intensive to produce
Bold and GoldTMTotal Phosphorus removal upto 71%[1]Proprietary
Iron filings (ZVI)Proven phosphorous retentionMay harm plants[2]
Red sandProven phosphorous retention-
Sorptive mediaTMProven phosphorous retentionProprietary
Water treatment residualsWaste product reuseProprietary

  1. Hood A, Chopra M, Wanielista M. Assessment of Biosorption Activated Media Under Roadside Swales for the Removal of Phosphorus from Stormwater. Water. 2013;5(1):53-66. doi:10.3390/w5010053.
  2. Logsdon SD, Sauer PA. Iron Filings Cement Engineered Soil Mix. Agron J. 2016;108(4):1753. doi:10.2134/agronj2015.0427.