Please use this identifier to cite or link to this item: http://hdl.handle.net/10497/18963
Title: 
Spatial and temporal variations of dissolved oxygen in Cha-Am municipality wastewater treatment ponds using GIS Kriging interpolation
Authors: 
Issue Date: 
2017
Citation: 
Koko, S., Irvine, K. N., Jindal, R., & Thongdara, R. (2017). Spatial and temporal variations of dissolved oxygen in Cha-Am municipality wastewater treatment ponds using GIS Kriging interpolation. Journal of Water Management Modeling, 25:C427. https://doi.org/10.14796/JWMM.C427
Abstract: 
This study investigated the spatial and temporal variations in dissolved oxygen (DO) in the Cha-Am wastewater treatment ponds
to assess treatment dynamics and to identify possible areas where the treatment train could be improved. Cha-Am is a small resort
town with extensive beaches, located on the west coast of the Gulf of Thailand. The wastewater treatment system for Cha-Am
consists of four ponds in sequence: aeration pond, sedimentation pond, extended aeration pond, and evaporation pond. Two YSI
6920 datasondes were installed near the inlet of the aeration pond and in the sedimentation pond, to measure dissolved oxygen
(DO), pH, conductivity, temperature, and turbidity at 30 min time intervals over a 3 month period. DO averaged 3.09 mg/L and 3.33
mg/L, respectively in the aeration pond and in the sedimentation pond. DO generally varied over a diel cycle with higher values
observed in midafternoon and lower values observed after midnight. DO often increased after a rainfall event. Ordinary Kriging
(OK) interpolation in ArcGIS10.1 was used to map the spatial distribution of DO at different depths based on YSI spot measurements.
OK indicated the highest DO concentrations were near the surface (0.5 m to 1.0 m); averaging 18.53 mg/L, 20.5 mg/L, 17.31
mg/L and 9.7 mg/L in the four ponds, but sometimes the concentrations were <2 mg/L near the bottom of the ponds. Two of the
ponds are used as a wild catch fishery and low DO seems to negatively impact the fish. The spatial trend of DO shows that normally
DO is lower at the inlet of the aeration pond than at its outlet even though mechanical aerators are operated through part of the
day. Improved aeration and sunlight penetration through enhanced particle settling may be of benefit.
URI: 
ISSN: 
2292-6062
Appears in Collections:Journal Articles

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