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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Hydro-environment : Water quality level in stormwater runoff throughconstructed wetland under tropical climate
Water quality level in stormwater runoff throughconstructed wetland under tropical climate
Author : NUR EMYLIA JOHARI(1), CHUN KIAT CHANG (2), MARFIAH AB. WAHID(1), AMINUDDIN AB. GHANI(2) & SUHAIMI ABDUL TALIB(1)
ABSTRACT
The acceleration of urbanization with variable land use and increasing population, the natural environment has
consistently deteriorated especially river water. The climatic change will change the rainfall pattern as well as evaporation
and evapotranspiration. Urban stormwater runoff is becoming important to be treated before discharge into the river water
as pollutant was carried off and gave significant impact to aquatic ecosystem. The incoming pollutant concentration by
stormwater runoff would be increasing the actual pollutant level in river water body. Constructed wetland as one of the
best management practice has been potentially to overcome this problem. However, an assessment of how much the
urban stormwater pollutant level reduction and water quality can be achieved is needed. Therefore, this study was
conducted to evaluate the performance of water quality level in stormwater runoff through a constructed wetland under
tropical climate. This study was conducted in actual constructed wetland according to the design criteria and requirement
as specified in MSMA 2nd Edition located in Universiti Sains Malaysia (USM) Engineering Campus, Nibong Tebal,
Penang, Malaysia. The parameters that investigated in this study were pH, temperature, dissolved oxygen (DO),
biochemical oxygen demand (BOD), chemical oxygen demand (COD), ammoniacal nitrogen (AN) and total suspended
solid (TSS). This study was conducted for eight months and grab sampling method were applied for 14 sampling stations.
The mean of water quality index (WQI) of the inlet constructed wetland was 79.26 3.94 indicated as slightly polluted at
Class III with WQI ranged from 70.22 to 85.00. After passing through the treatment at constructed wetland, the mean of
WQI of the outlet constructed wetland was 84.49 3.68 indicated as clean at Class II with WQI ranged from 74.74 to
89.31. High and low intensity of rainfall event will affect the level of pollutant as the land used of catchment area was
same. The results showed a reduction of pollutant level for TSS and AN with 72.99% and 74.06% of percentage reduction,
respectively throughout the constructed wetland. These results may be explained further by the treatment media in
constructed wetland. Therefore, an appropriate design of constructed wetland with the consideration of pollutant level in
catchment area land used is necessary to be identified as the constructed wetland shown the high contribution of the
stormwater runoff quality enhancement.
File Size : 399,688 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Hydro-environment
Date Published : 20/08/2015
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