Department of Civil and Environmental Engineering, Kongju National University, 1223-24 Cheonan-daero Seobukgu, Cheonan city, Chungnamdo, 31080, Republic of Korea.
Department of Civil and Environmental Engineering, Kongju National University, 1223-24 Cheonan-daero Seobukgu, Cheonan city, Chungnamdo, 31080, Republic of Korea.
Chemosphere. 2018 Oct;209:20-27. doi: 10.1016/j.chemosphere.2018.06.062. Epub 2018 Jun 9.
Low-impact development (LID) techniques are being applied to reduce non-point source (NPS) pollution which are generated from various land uses. Cost-effective LID design requires consideration of influent runoff properties as well as physical and ecological pollutant-removing mechanisms. However, current LID technology design has failed to reflect the different properties of influent water from various land uses, and the biological design factors in LID facilities causing low efficiency and difficulties in maintenance. This study was conducted to identify biological design factors by analyzing the impact of the pollutants included in influent runoff and physical environment on microbial growth in rain garden facilities applied to different land uses. The results showed that the non-point source pollutant loadings were about 1.5-3 times higher in the runoff from parking lots, which are frequently visited by automobiles than in roof runoff. Type of soil, chemical species, and chemical composition were assessed as internal environmental factors having significant impact on the phylum and the count of microorganisms in the facilities. The growth of Cyanobacteria, Streptophyta, Chlorophyta, Bacillariophyta, and Xanthophyceae was good when there was appropriate water content in the soil, light, and sandy soil. Based on these results, the future design of rain garden facilities should be performed by considering a microorganism appropriate to the properties of the influent pollutants, determining appropriate water content, nutrient content and soil type, and choosing plants that contribute to microbial growth.
低影响开发（LID）技术正被应用于减少各种土地利用产生的非点源（NPS）污染。具有成本效益的 LID 设计需要考虑到进水径流特性以及物理和生态污染物去除机制。然而，当前的 LID 技术设计未能反映出不同土地利用的进水特性，以及 LID 设施中的生物设计因素导致效率低下和维护困难。本研究旨在通过分析应用于不同土地利用的雨水花园设施中进水径流和物理环境对微生物生长的影响，确定生物设计因素。结果表明，停车场等汽车频繁出入的区域的径流水中非点源污染物负荷约为屋顶径流水的 1.5-3 倍。土壤类型、化学物质和化学成分被评估为对设施中微生物的门和数量有重大影响的内部环境因素。当土壤中有适当的水分、光照和沙土时，蓝藻、苔藓植物、绿藻、硅藻和黄藻的生长良好。基于这些结果，未来的雨水花园设施设计应考虑到与进水污染物特性相适应的微生物，确定适当的水分含量、养分含量和土壤类型，并选择有助于微生物生长的植物。
