PM02 Remediation Techniques and Strategies
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(PM016) Performance of Constructed Wetland Systems for Treatment of Crankcase Oil in Stormwater.

Mastin, B1, Rodgers, Jr., J2, Shah, Y3, 1 EA Engineering, Science and Technology, Sparks, MD, USA2 Clemson University, Clemson, SC, USA3 University of Missouri-Rolla, Rolla, MO, USA

ABSTRACT- Crankcase oil in stormwater runoff enters surface waters with sufficient concentration and duration of exposure to cause adverse effects to aquatic receiving system biota. For oil contaminated waters that can be coalesced into streams or pipes, constructed wetland treatment systems may be a viable option for risk mitigation. The objectives of this study were to: 1) formulate a simulated oil-contaminated stormwater, 2) measure initial risks of this simulated oil-contaminated stormwater to Ceriodaphnia dubia and Pimephales promelas, 3) assemble a pilot-scale constructed wetland treatment system to decrease toxicity of this simulated oil-contaminated stormwater (1.24 g Havoline® SAE 10W30 crankcase oil/L), and 4) measure the performance (toxicity and chemical specific parameters) of this system over a 90-d treatment period. Decreases (i.e., rates and extents) of total organic carbon (TOC), chemical oxygen demand (COD), 5-d biological oxygen demand (BOD5), and acid-soluble Zn concentrations were measured from the inflow and outflow of each stage of three pilot-scale wetland treatment systems. In addition, 7-day static, renewal toxicity experiments were conducted with P. promelas and C. dubia to measure declines in toxicity. Overall, mean reductions of TOC, COD, BOD5, and acid-soluble Zn concentrations by these pilot-scale treatment systems were 88.3%, 51.3%, 84.6%, and 76.4%, respectively. Mean survival (7-d) of C. dubia and P. promelas increased from 0 (inflow) to 97.8 (±4.4) and 85.6 (±3.7)% (outflow), respectively. The pilot-scale constructed wetland treatment system in this study was designed to treat a predictable mass and volume of simulated oil-contaminated stormwater. Use of constructed wetland treatment systems in full-scale applications for stormwater treatment is reasonable with further information about the variability (i.e., concentration and mass) of targeted constituents in coalesced stormwater streams from parking areas and other impervious surfaces.

Key words: crankcase oil, constructed wetlands, stormwater, risk mitigation

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