Oil and sediment removal - best products? 2

[CFTguy]

I am working on a project where we hope to discharge runoff from a parking lot into a natural drainageway. We will be required to remove oil and sediment from the runoff. The lot will accomodate cars and buses, so typical parking lot-type loads would be expected. I have looked at a couple of products online, including Vortechs and Stormceptor, and I am looking for input from other designers about which products are most cost-effective and work the best. The client is a non-profit entity and this is an extremely cost-sensitive project.

Any help you could provide would be much appreciated!

 

[cvg]

most of these types of units only work at low flows. And realistically, you just cannot remove pollutants from a larger rainfall runoff event in real time. If you want to filter all of the runoff, you will need to capture the entire storm and then release it slowly through the stormceptor. Alternatively, you can bypass the larger flows straight to the river. If you are going to capture all of the flows, it might be cheaper to just construct a grassed (or graveled) retention basin and forget about the stormceptors. Just let the runoff infiltrate into the soil.

 

[Hoagie]

If you have the area and head, you may want to consider bioretention. It's much cheaper than an oil-water-grit seperator and is considered a sustainable device. Not only will it filter, but it will also treat hydrocarbons, nitrate/ites, phosphates and some of the other usual pollutants. Check out this link to Prince George County's bioret site.

http://www.co.pg.md.us/Government/AgencyIndex/DER/ESD/Bioretention/bioretention.asp