Application of a gravel wetland system for treatment of parking lot runoff

作者：Choi Jiyeon; Maniquiz Redillas Marla C; Lee Soyoung; Mercado Jean Margaret R; Kim Lee Hyung^*

来源：Desalination and Water Treatment, 2013, 51(19-21): 4129-4137.

DOI：10.1080/19443994.2013.781109

• Best management practice
• Gravel wetland system
• Parking lot
• Stormwater runoff

In this study, the applicability of a gravel wetland system, a best management practice similar to horizontal subsurface flow constructed wetland was investigated for the treatment of parking lot runoff. Monitoring of storm events was performed between July 2010 and November 2011 to estimate the pollutant event mean concentration (EMC) at the inflow and outflow of the gravel wetland system. The ratio of the discharge EMC to the inflow EMC (EMCout/EMCin) was assessed by treatment-affecting factors such as rainfall, rainfall intensity, volume, average flow and peak flow ratios. Based on the results, the system showed satisfactory treatment efficiency for total suspended solids (more than 70%) and total Zinc (almost 60%). Average treatment efficiency for chemical oxygen demand was 50%; while 35 to 45% for nutrient such as total nitrogen and phosphorus. Among the factors, the volume ratio (Vol(out)/Vol(in)) and average flow ratio (Avg. flow(in)/Avg. flow(out)) showed greater influence in the EMC ratio. Rainfall also influenced the EMC ratio but not very significantly. Overall, the system was able to treat 30-60% of inflow and improved the water quality standard of outflow to one or two levels higher than the inflow, even if the inflow was highly polluted.

• 出版日期2013-5-1