Stormwater Symposium

Oral

394829 - Evaluation of microorganisms in raingarden treating stormwater runoff from different land uses

Tuesday, June 5
8:30 AM - 10:00 AM
Location: Greenway AB
Co-Authors: Franz Kevin Geronimo, 1223-24 Cheonan-daero, Seobukgu, Cheonan city, Chungnam province, South Korea, 31080 – Kongju National University; Hyeseon Choi, 1223-24 Cheonan-daero, Seobukgu, Cheonan city, Chungnam province, South Korea, 31080 – Kongju National University; Lee-Hyung Kim, 1223-24 Cheonan-daero, Seobukgu, Cheonan city, Chungnam province, South Korea, 31080 – Kongju National University; Marla Redillas, Taft Avenue, Malate Manila, Philippines, 2401 – De La Salle University-Manila; Marla Redillas, Taft Avenue, Malate Manila, Philippines, 2401 – De La Salle University-Manila

Different kinds of microorganisms inhabit the ecosystems of various land uses due to the differences in environmental conditions. Limited studies have been conducted about microorganisms in LID facilities for non-point source (NPS) pollution removal. In this study, the microbial distribution in raingarden facilities treating different concentrations of NPS was investigated to determine the design factors for optimized biological functions. Raingarden1 was developed to treat roof runoff in 2011 and has been monitored for more than four years. On the other hand, raingarden2 was developed to treat parking lot runoff and has been monitored for more than two years since its construction in 2013. Soil samples were collected at the inlets of the raingardens and were analytically analyzed for microorganisms count to evaluate the effects of pollutant concentration on the distribution of microorganisms. The dominant microbial phyla commonly found in the in-situ soil and raingardens occupying more than 2.5% of the entire microbial communities were Proteobacteria, Acidobacteria, Actinobacteria, Chloroflexi, Planctomycetes, Bacteroidetes and Verrucomicrobia. Most of these phyla were actively involved in soil organic matter biodegradation. In addition to the nutrient availability, the differences in physical properties of soil also had an impact on the microorganism count. The growth of Cyanobacteria, Streptophyta, Chlorophyta, Bacillariophyta and Xanthophyceae were good when there was appropriate water content in the soil, light exposure and in sandy soil environment. The results of this study on the biological characteristics may be used as cost-effective design criteria of LID facilities for NPS pollutant treatment in urban areas.

Jungsun Hong

PhD Candidate
Kongju National University

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