2. Materials and methods
2.1. Location of pilot scale experiment
Wastewater from aquacultural drainage river, which was located in Songjiang Modern Agricultural Ecological Park(Shanghai, China), was selected as objective in the present study. The length and width of the selected aquacultural drainage river were 600 m and 6.5 m, respectively. The average water depth was 1.2 m, and the highest water depth could reach 1.65 m when breeding peak . The bank of river was totally hard cement,the average length of bank was 4 m, and the slope angle was 45◦.There was a water outlet in every aquacultural pond, through which the wastewater in aquacultural ponds could drain away to the selected river and the average amount of inlet aquaculture wastewater was 2590 m3/d.