Treatment of parking lot stormwater using a StormTreat system.
The effectiveness of a StormTreat system in treating stormwater from a commercial parking lot in Connecticut was evaluated. Flow-weighted composite samples were collected from StormTreat inflow and outflow during a 2-yr study. Bypass flow was not monitored. The StormTreat significantly (P < 0.05) reduced total suspended solids, total phosphorus, total Kjeldahl-N, total zinc, total copper, and fecal coliform bacteria on a concentration basis. The StormTreat system retained 49% total suspended solids, 74% total phosphorus, 44% total Kjeldahl-N, 45% total zinc, 29% total copper, 2% total lead on a mass basis, and 99% fecal coliform on a concentration basis. Treatment efficiency was not associated with storm size, chamber stage, discharge rate, or hydraulic retention time (r < 0.355). The system retained ammonia-N more efficiently during the summer than during the winter (P < 0.01) and retained total zinc less efficiently during the summer than during the winter (P < 0.05). Season did not significantly (P > 0.05) affect the treatment of other monitored water quality variables. The StormTreat system reduced the concentrations of stormwater pollutants commonly found in parking lot runoff.
Sonstrom
Rebecca S
RS
Department of Natural Resources Management and Engineering, University of Connecticut, Storrs 06238-4087, USA.
Clausen
John C
JC
Askew
David R
DR
D004755:Enterobacteriaceae / Q000302:isolation & purification; D005374:Filtration; D019216:Metals, Heavy / Q000302:isolation & purification; D011891:Rain; D012621:Seasons; D001335:Vehicle Emissions; D014872:Water Movements; D018508:Water Purification / Q000379:methods*
D019216:Metals, Heavy; D001335:Vehicle Emissions