[Distribution form of nutrients in roof runoff].
6 rainfall-runoff events were examined from a concrete roof by a traffic artery in Shanghai to characterize the particle-bound and dissolved nutrients in roof runoff and to get more knowledge about roof runoff pollutants and lay the theoretic foundation for the selection of roof runoff purification method. Results indicated that event mean concentration (EMC) of TN ranges between 4.208 mg/L and 8.427 mg/L compared to 0.078-0.185 mg/L for TP. DN and PP are respectively the primary forms of TN and TP. During the runoff, the number ratio of small particles is gradually increased. The dynamic behavior of TP is similar to TSS, but the TN-TSS relationship in the course of runoff is not obvious. The increase of both PN/TSS and the number ration of small particles showed that nitrogen (microgramme per gram particle weight) attached to small particles is more than large particles. Regression analysis between TSS and TP & PP of samples in the early 10 min of runoff results in a high R2, but the relationship between TSS and TP & PP of samples in the entire runoff is not as close as the early 10 min, which reflects that the phosphorus quantity attached to the particle changes from the perspective of the entire course of runoff. First flush of TP is stronger than TN because the load discharge of dissolved nutrients is more stable than particle nutrients. In addition, more nitrogen absorbed by the unit mass small particles to a certain degree weakens the first flush of TN.
Wang
Biao
B
State Key laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China. csile@163.com
Li
Tian
T
Meng
Ying-Ying
YY
Ren
Zhong-Jia
ZJ
Cao
Bing-Yin
BY
D002947:Cities; D009584:Nitrogen / Q000032:analysis*; D010316:Particle Size; D010758:Phosphorus / Q000032:analysis*; D011891:Rain / Q000737:chemistry; D014872:Water Movements; D014874:Water Pollutants, Chemical / Q000032:analysis*
D014874:Water Pollutants, Chemical; D010758:Phosphorus; D009584:Nitrogen