Evaluation of particle transport in permeable pavements under oil loadings: Fid-Bau Portal

Evaluation of particle transport in permeable pavements under oil loadings

Aryal, Rupak / Beecham, Simon / Lee, Byeong-Kyu

Abstract Permeable pavements with gravel base courses promote infiltration of stormwater and can improve water quality. However, finer grained particles on the surface of the pavements or their surrounding areas may enter the underlying void spaces along with stormwater due to their wash-off behavior and their smaller size. After entry into the void space, the smaller particles can act as a barrier that may reduce the infiltration over time. This can reduce the functionality of the pavement and can alter water quality by either sorbing or leaching chemicals present in the infiltrating stormwater. Factors affecting the particulate deposition in the void spaces include shape and size, hydrophobicity, natural organic matter, metals, and the surface charge of the particulate as well as the media. Red sand particles of three sizes <10, 10–25 and 30–50 μm with crankcase oil and without crankcase oil were mixed with semi-artificial stormwater and passed at a constant flow rate through a glass column containing aggregate with and without being pre-soaked in crankcase oil. This study focused on the resulting transport behavior of particles less than 50 μm in diameter, which were generally not picked up by street sweeping. The results show that the particles with and without oil transported in the column at different scales. The presence of oil in the infiltration media and in the stormwater had a nearly 10 fold higher risk of becoming clogged than when no oil was present. Similarly the calculated serviceable life of pavement was reduced by a similar factor when oil was present.