Oct 01, 2010

Compact Filtration

A full-service commercial and residential developer has installed Imbrium Systems Jellyfish fine sediment filter to treat storm water runoff at a redevelopment project in Newton, N.J. The developer chose Jellyfish as the most effective treatment device to meet the state’s storm water requirements.

The New Jersey Department of Environment Protection (NJDEP) storm water treatment program requires the use of a filtration system prior to infiltration to protect groundwater from storm water pollutants. Jellyfish’s state-of-the-art verified technology, which has obtained interim certification from NJDEP, was identified as the ideal storm water treatment best management practice (BMP) for this site for several key reasons.

Site Constraints

Design and installation considerations were important to this site because of pre-existing underground utilities and surrounding infrastructure on an adjacent property. Due to limited space, it was essential to install a small high-performance filtration system. After rejecting larger vault alternatives, the compact, highly efficient Jellyfish JF6 model was chosen. It offered an ideal combination of enhanced treatment flow capacity and a small footprint.

The typical elevation drop design requirement for filtration BMPs is 2 ft or more. Because the Jellyfish is designed with only 18 in. of “head,” or drop, to fully operate the system, it fit easily within the site drainage system parameters. In addition, Jellyfish’s advanced membrane filtration treats fine sediment particles at a superior treatment flow rate of 50 gal per minute per cartridge.

The Jellyfish precast concrete structure’s components are significantly lighter when compared to other NJDEP-approved filter systems. The Jellyfish unit was easier to install because the heaviest lift was less than half the weight of other alternative vault structures. This means significant time and equipment cost savings for the contractor and developer.

Economic Decision-Making

The technology’s low long-term maintenance costs make it an extremely attractive choice. In this case, a major reason the Jellyfish was chosen over other filtration BMPs was its long-term affordability. The Jellyfish unit installed at the commercial redevelopment site contains seven small, 20-lb cartridges. Other filtration devices considered required 22 large, 200-lb-plus cartridges.

Another important consideration was that Jellyfish cartridges are passively backwashed after every storm. The cartridges are manually backwashed each year during routine maintenance, thus extending the cartridge life. The Jellyfish is also a simple system to inspect and maintain. At this site, the maintenance cost over a three-year period was estimated to be one-third the cost of other filtration BMPs considered.

Martin Realty Development & Construction Co., a well established full-service developer, has been operating in central New Jersey since 1972. President Steve Martin was excited about the implementation of the Jellyfish technology.

“For us, using the Jellyfish system was more economical, and it easily met NJDEP requirements,” he said. “It was also a pleasure to work with Imbrium Systems because of their hands-on approach and technical support at the time of installation.”

Solution Summary

Jellyfish is a remarkably compact system that allows three times the flow capacity with just one-third the footprint and one-fifth the weight of conventional filtration BMPs. Its unique high-surface-area membrane filtration tentacles trap more than 80% of total suspended solids, effortlessly capturing neutrally buoyant particles, oils and saturated hydrocarbon-based particles, making it a cost-effective treatment solution.

Daniel S. J. Wilson is director of government & public affairs
at Imbrium Systems Corp.