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Line 43: − A number of granular amendments have been demonstrated to improve nutrient removal from bioretention discharge water. 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. Typically these type of amendments would comprise 5- 10 % by volume of the filter media mixture. + − <table class = "table table-striped table-responsive">+ − <caption><strong>Soil Amendments</strong></caption>+ − <tr class ='success'><th>Material</th><th>Benefits</th><th>Potential concerns</th></tr> − <tr><td>[[Biochar]]</td><td>-</td><td>Currently expensive<br>Energy intensive to produce</td></tr> − <tr><td>[[Iron filings (ZVI)]]</td><td>Proven phosphorous retention</td><td>May harm plants<ref>Logsdon SD, Sauer PA. Iron Filings Cement Engineered Soil Mix. Agron J. 2016;108(4):1753. doi:10.2134/agronj2015.0427.</ref></td></tr> − <tr><td>[[Red sand]]</td><td>Proven phosphorous retention</td><td>Proprietary</td></tr> − <tr><td>[[Sorptive media]]<sup>TM</sup></td><td>Proven phosphorous retention</td><td></td></tr> − <tr><td>[[Water treatment residuals]]</td><td>Waste product reuse</td><td>Proprietary</td></tr> − </table>
→Amendments
===Amendments===
===Amendments===
<p>Typically these type of amendments would comprise 5- 10 % by volume of the filter media mixture.
It is recommended that this fraction be taken from the topsoil or the organic portion otherwise; keeping the sand as minimum 65 % by volume. </p>
{{:Amendments}}
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