Stormwater Treatment System: Series Stormceptor For Large Spill Capacity
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Designed to treat run-off and manage erosion control from larger drainage areas, the Series Stormceptor can more than double the treated drainage area of the In-Line Stormceptor System. The series models are available in 11,000, 13,000 and 16,000 gallon sizes. The Series Stormceptor consists of two structures. The first structure acts as a flow splitter, diverting half of the flow into the first treatment chamber, and allowing the second half of the flow to travel through the unit to the second treatment chamber. The Series Stormceptor units contain the patented internal by-pass inherent in all Stormceptor designs, preventing scour and resuspension during high flows, which have hampered the performance of conventional separator systems.
Normal Operating Conditions
Under normal (frequent) operating conditions, stormwater enters the upper by-pass chamber of the first structure. Half of the flow is diverted by a u-shaped weir into the separation/holding chamber of the first structure. This downward flow is directed, by right-angle outlets, around the circular walls of the chamber. Fine and coarse sediment settle to the floor of the chamber, while the petroleum products rise and become trapped beneath the fiberglass insert. The half of the flow which is not diverted in the lower chamber continues through the first structure to the second structure. This remaining flow is diverted into the lower chamber of the second structure. Suspended solids and floatables are separated as they are in the first chamber.
By-Pass Operating Conditions
During infrequent high flow events, peak stormwater flows will pass over the diverting weirs in the first and second chamber and continue through the by-pass chamber into the downstream sewer system. This by-pass activity creates pressure equalization across both units, preventing scouring. A portion of incoming sediment continues to be diverted by the weirs in the first and second structure into the treatment chamber.
Maintenance Procedure
You can inspect and maintain the Series Stormceptor from the surface, without entry into the unit. Perform maintenance once the stored volume reaches 15% of the Stormceptor capacity, or immediately in the event of a spill.
Maintenance intervals vary depending on the application. Therefore, we recommend quarterly inspections during the first year of installation, so you can accurately establish the maintenance schedule.
Remove oil and sediment through each of the 24-inch diameter outlet riser pipes. Alternatively, you may remove floatables and hydrocarbons through the 6-inch oil inspection port. Both steps must be performed in each of the two structures.
The requirements for the disposal from Stormceptor are similar to that of any other Best Management Practice (BMP). Consult local guidelines or your Stormceptor Area Marketing Manager prior to disposing the separator contents.
The In-Line Stormceptor has been applied numerous times as an NPDES Phase I Best Management Practice, and is an ideal solution for communities dealing with the NPDES Phase II Regulations.