The PPL filtration treatment for highway runoff.
The purpose of this research is to design a device which can treat highway runoff, especially runoff during initial rainfall with high pollution intensity, by connecting it with the draining grid sink of a drainage ditch on a highway, through which runoff flows. Porous polypropylene (PPL) particles were used as a treatment agent. The device treated highway runoff during initial rainfall by filtration and adsorption. It had a capacity to treat highway runoff in an area of 7.0 m x 20.0 m when rainfall intensity was up to 10 mm/hr. Two cases of rainfall intensity were set for the experiment: 5 and 10 mm/hr. The relationships between the efficiency of SS and COD removals and the rainfall intensity were investigated. Using artificial highway runoff with constant flow and SS concentration, results of 70% or more of SS removal with 5 mm/hr and 50% or more with 10 mm/hr were obtained. COD removal efficiency was about 90% of SS removal efficiency. This device was effective to remove non-point source pollutants in runoff on highways.
Kimura
S
S
Hokukon Inc., 3-15-27 Tarumi-cho, Suita-shi, Osaka, Japan. kimura@mail.hokukon.co.jp
Matsui
S
S
Simuzu
Y
Y
Lee
B C
BC
Shinya
M
M
D005374:Filtration; D010100:Oxygen / Q000378:metabolism; D010316:Particle Size; D011126:Polypropylenes; D016062:Porosity; D011891:Rain; D001335:Vehicle Emissions; D014872:Water Movements; D014873:Water Pollutants / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
D011126:Polypropylenes; D001335:Vehicle Emissions; D014873:Water Pollutants; D010100:Oxygen