Rooftop Gardens


Atlantis America provide a range of solutions to help you build your commercial or residential Rooftop Garden. With advanced drainage products and our engineering expertise, we can both provide and consult on all areas of your rooftop garden production. Besides the aesthetic benefit, rooftop gardens can provide a source of food, hydrological sustainability, increased air quality and regulation of temperature.

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Atlantis Swales / Rain Gardens


Swales (or Rain Gardens) are an ecological way to manage storm water and rain water run-off by planting native flora into a depressed hole or channel. Water is directed to these channels via gravity and are absorbed by the plants and water table, reducing stormwater runoff.

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Vertical Gardens


Atlantis America has built some of the most impressive, large scale vertical gardens in the world. From Dubai to Australia we are continually growing and developing towards our dream of a Green City.

 

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Geosynthetics in the construction of a Southern California subsurface biofilter cell system

bio-filter-system-usa

INTRODUCTION

These benefits are perfectly matched for this project: construction of a subsurface biofilter cell system for the removal of selenium and nitrate.
 
To meet this EPA requirement, the Irvine Ranch Water District (IRWD) developed a plan to address regional water quality treatment. The plan included the Cienega Filtration Facility adjacent to the Peters Canyon Channel that is specifically for removing selenium from dry weather low flows.
 
The selenium TMDL is based on meeting the chronic California Toxics Rule (CTR) criterion of five parts per billion (ppb) for protection of aquatic health in dry weather flows. Selenium concentrations in dry weather flows in the Peters Canyon Channel typically range from about 30–50 ppb, but can be much higher at groundwater seeps and weep holes. The current selenium concentration levels are not harmful to humans but have potential to bio-accumulate.
 
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Placement of granular media matrix inside of the cell.
 

CONCEPT OF BIOFILTER CELL

The project was designed to pass dry weather flows that are diverted from Peters Canyon Channel through an organically augmented biofilter cell, which was composed of a gravel matrix.

The flows are amended with a carbon source to feed bacteria and create anoxic (oxygen-deficient) conditions in the biofilter cell. Under these conditions, common forms of selenium (i.e., selenate and selenite) are converted into elemental forms of selenium, which have relatively low toxicity and are encapsulated by bacteria growing on the bed materials (e.g., gravel) in the biofilter cell.

The biofilter cell was created using geosynthetic materials, principally Atlantis Flo-Tank/ D-Raintanks and granular media matrix. The biofilter cell is the primary treatment component of this project. Raw water is pumped from Peters Canyon Channel, amended with electron donor, and injected into the biofilter cell through a piped header system.

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Within the biofilter cell, an active biofilm is grown, which attaches to the aggregate. The biological activity helps to create anoxic conditions that are favorable for the conversion of soluble selenium compounds to insoluble colloids and precipitates. The insoluble selenium precipitates are adsorbed to the biofilm and sequestered within the biofilter cell. Hydraulic retention time and electron donor feed rate are the variables that can be adjusted to maintain the desired environmental conditions.

CONCLUSIONS

Design and construction of the biofilter cell were successfully implemented Geosynthetics provided a nonreactive barrier for environmental isolation of the biofilter cell.

 

 

Distributor: Layfield
Project: Demonstration of field-scale biofilter cell system with Atlantis Flo-Tank/D-Rain Tank
Purpose: Verification and evaluation of field-scale effectiveness and practicality of subsurface biofilter cell system for
removal of selenium and nitrate from dry weather flows in Peters Canyon Channel
Client: Irvine Ranch Water District (www.irwd.com)
Engineer/Designer: Construction Quality Assurance (CQA):Geosyntec Consultants (www.geosyntec.com)
Contractor: CDM Construction

 

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