title: A concept for planning and management of on-site and centralised municipal wastewater treatment systems, a case study in Bangkok, Thailand. II: scenario-based pollutant load analysis.
abstract: Scenario-based pollutant load analysis was conducted to develop a part of a concept for planning and management of wastewater treatment systems (WWTSs) under the mixture conditions of centralised and on-site WWTSs. Pollutant discharge indicators and pollutant removal efficiency functions were applied from another paper in the series, which were developed based on the existing conditions in urban and peri-urban areas of Bangkok, Thailand. Two scenarios were developed to describe development directions of the mixture conditions. Scenario 1 involves keeping the on-site wastewater treatment plants (WWTPs) within the areas of centralised WWTSs. Scenario 2 is dividing the centralised and on-site WWTS areas. Comparison of the smallest values of total pollutant discharge per capita (PDCtotal) between Scenarios 1 and 2 showed that the smallest PDCtotal in Scenario 1 was smaller than that in Scenario 2 for biological oxygen demand, chemical oxygen demand and total phosphorus whereas the smallest PDCtotal in Scenario 2 was smaller than that in Scenario 1 for total nitrogen, total coliforms and faecal coliforms. The results suggest that the mixture conditions could be a possible reason for smaller pollutant concentrations at centralised WWTPs. Quantitative scenario-based estimation of PDCtotal is useful and a prerequisite in planning and management of WWTSs.
authors: School of Civil Engineering, The University of Queensland, QLD 4072, Australia. tsuzuki.yoshiaki@gmail.com
authors: Yoshiaki
authors: Y
authors: Tsuzuki
authors: Thammarat
authors: T
authors: Koottatep
authors: Thitiphon
authors: T
authors: Sinsupan
authors: Supattra
authors: S
authors: Jiawkok
authors: Chira
authors: C
authors: Wongburana
authors: Suraphong
authors: S
authors: Wattanachira
authors: Yuttachai
authors: Y
authors: Sarathai
mesh_terms: D019982:Organizational Case Studies; D010934:Planning Techniques; D013785:Thailand; D062065:Wastewater; D018508:Water Purification / Q000379:methods*
chemical_list: D062065:Wastewater