Calibration of a parsimonious water quality model to estimate seasonal TSS loading in a combined sewer system: A case study in Khon Kaen, Thailand
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Abstract
A parsimonious water quality model was calibrated and validated to 36 samples analyzed for total suspended solids (TSS) collected from the Khon Kaen’s combined sewer system during 12 sampling events from June 1 to October 28, 2015. TSS concentrations were simulated using observed flow rates in the sewer as the input, computed continuously at 5-minute time steps. The calibrated model was then used to estimate the seasonal mass loading of TSS through the system and percentage of which that was sent to the wastewater treatment plant (WWTP) for treatment. Calibration achieved a Nash-Sutcliffe Efficiency value of 0.74, while validation achieved 0.54. The modelling results estimated that 537,000 kilograms of particulate matter were transported via 11.8 million cubic meters (m3) of stormwater and wastewater that discharged through the sewer system (average concentration of 45.7 mg/L) from June to October 2015. Calculations also estimated that 44% of the particulate matter was collected by the WWTP.
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