Abstract:

 In order to expand the purification function of rainwater storage tank, feasibility of adding microoganism to purify initial rainwater in storage tank was studied. The results showed that the purification effect was significantly improved by adding microoganism including 9 bacteria species and 2 fungal species into initial rainwater. Aeration was an important environmental factor that greatly influences the biological treatment effect. A high purification rate was obtained even if the dosage of microoganism added to the initial rainwater was small so long as the time for microoganism growth was enough. Under the conditions of aeration, 24 h treatment time, and 0.1 mL microoganism inoculating in 1 L initial rainwater, the removal rates of chemical oxygen demand (COD), NH3N, total nitrogen (TN) and total phosphorus (TP) were 71.2%, 55.3%, 51.1% and 82.6%, respectively.

Key words:  initial rainwater; adding microorganism method; purification; storage tank