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ANALYSIS OF TREATMENT PERFORMANCE OF CONSTRUCTED STORMWATER WETLANDS WITH UTILISING A SIMPLIFIED CONCEPTUAL MODEL

Mangangka, Isri R. and Goonetilleke, Ashantha and Egodawatta, Prasanna and ., Soekarno and Supit, Cindy Jeane (2014) ANALYSIS OF TREATMENT PERFORMANCE OF CONSTRUCTED STORMWATER WETLANDS WITH UTILISING A SIMPLIFIED CONCEPTUAL MODEL. In: The International Conference on Environmentally Friendly Civil Engineering Construction and Materials (EFCECM 2014), Manado - Indonesia, 13-14 November, Manado.

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          Abstract

          Constructed wetlands are used to treat stormwater pollutants and reduce impacts no downstream environment by attenuating peak discharge and reducing runoff volume. They can also treat stormwater quality by removing pollutants through processes such as settling, filtration, adsorption, and biological uptake. The hydrologic and hydraulic characteristics such as rainfall depth and intensity, wetland area and bathymetry, inflow discharge, hydraulic retention time and outlet structure are the most important parameters influencing treatment performance. A simplified conceptual model to replicate hydraulic processes of a constructed wetland has been developed. The model is based on conceptual approaches using empirical mathematical equations to represent water movement through interlinked storage of wetland inlet pond and its cells via inlet/outlet structures, and estimation loss rates due to percolation and evapotranspiration. The model has been calibrated and validated using recorded data from a monitored constructed wetland. The model enables to evaluate the fluctuation of stormwater in the wetland during the storm event and predict the retention time. Water quality treatment process in a wetland has also been evaluated in this study. The evaluation involved water quality analysis to a number of water samples from a monitored constructed stormwater wetland, univariate, bivariate and multivariate statistical analysis including Principal Component Analysis (PCA) and development of Partial Least Square (PLS) model. The water quality parameters which have been evaluated in this study were Total Suspended Solid (TSS), Total Nitrogen (TN) and Total Phosphorus (TP). The analysis results show that rainfall intensity does not influence the treatment performance. The results also show that more rainfall depth and runoff volume decrease the treatment performance. Prior to develop the PLS models the dataset was normalized and transformed using principal component analysis (PCA) in order to increase the efficiency of the model. The developed PLS models have been calibrated and validated using cross validation procedure. The calibration plots show that the developed PLS models are adequate to be used for prediction.

          Item Type: Conference or Workshop Item (Paper)
          Subjects: T Technology > TA Engineering (General). Civil engineering (General)
          Divisions: UNSPECIFIED
          Depositing User: Mr. Benhard W. Tampangela, ST
          Date Deposited: 07 Sep 2017 13:35
          Last Modified: 22 Sep 2017 09:47
          URI: http://repo.unsrat.ac.id/id/eprint/1700

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