Storage and Filtration System Required to Process Effluent Groundwater at Illinois Construction Site

Illinois Soil Remediation Site Requires – Filtration of Contaminated Storage Cell

The St. Louis branch was asked to provide a complete storage and filtration system for dewatering a contaminated liquid storage cell at a construction site.  The design criteria required 250,000 gallons of storage and a 350 gallons-per-minute filtration flow capacity.

The scope of the job expanded when the contractor had to increase excavation depth at the contaminated site.  Influent groundwater at the rate of 1,000 gallons-per-minute threatened to bring the project to a halt.  Rain for Rent was again called upon to provide emergency filtration. 

Within one week, with the help of our Specialty Rental Division and the Engineering Department, Rain for Rent was able to install  a system capable of removing trace amounts of PCBs, VOCs and dioxins at a flow rate of 1,000 gallons-per-minute.  The equipment for this system included: one 48-4 sand media filter, three BF400 units with oil-absorbent bags, two 20,000-pound carbon units, one 21,000-gallon bi-level tank for backwash containment, a digital flow meter and all the associated manifolds. 

 With the problem of the influent groundwater at the contaminated site solved, Rain for Rent’s attention could now be directed back to the original project, storing and processing rainwater from the site cell.  The equipment for this project included:  one 18,000-gallon weir tank; thirteen 21,000-gallon bi-level, coated tanks; two HH-80 Power Prime™ pumps; one 48-2 sand media filter; one BF400; two 8,000-pound carbon vessels; a digital flow meter and complete manifolding and valving of the entire system.

All 14 tanks were manifolded together, isolating one tank to store the backwash from the sand media unit.