| Nutrients of nitrogen and phosphorus in the effluent inadequately treated by the existing wastewater treatment system have aggregated the contamination of the river, estuary, and coastal areas. In order to improve the effluent, the introduction of an advanced treatment processes into the existing wastewater treatment system have required. Therefore, this study was performed to evaluate and investigate on the conversion of the existing wastewater treatment system to an advanced wastewater treatment system through the investigation of characteristics of wastewater in our country. This experiment was carried out pilot-scale plant of Advanced Step Aeration (ASA) system at D Wastewater Treatment Plant in M city. The results of this study showed that the ASA system was very effective in improving the effluent compared to the existing wastewater treatment system. The percentages of nitrogen and phosphorus removals by ASA system were more than 80% as well as more than 85% removal of BOD, COD and SS. Compared to Bardenpho, VIP, A₂O and AO systems, the ASA system deviced from this study was the cost-effectiveness for required land area, control and management, and cost in retrofiting the existing wastewater treatment system largely depending on conventional activated sludge processes. |
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