| Title |
A Study on Behaviour of Nitrogen , Phosphate , pH and ORP in Intermittently Aerated Activated Sludge System |
| Authors |
서인석(In Seok Seo),김병군(Byong Goon Kim),박승국(Seung Kook Park) |
| Abstract |
In this research, 5 types of intermittently aerated activated sludge system were operated for nitrogen and phosphorus removal in wastewater. Also, pH and ORP (Oxidation-reduction potential) behaviour was evaluated as a control parameter for nitrogen removal. Nitrogen and phosphorus removal efficiency is strongly dependent on COD/TN ratio of influent The behaviour of nitrogen concentration and ORP values during a aeration-nonaeration cycle is described by a typical profile with 3 bending points. Also, pH raised at nonaeration state and decreased at aeration state. From analysis of ORP or pH slope ( ΔORP/ Δt or ΔpH/ Δt), ORP was more critical at endpoint of denitrification than pH. As a results, ORP pattern is more useful than pH as a control method in intermittently aerated activated sludge system. |