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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Hydro-environment : Monitoring of thermal power plant operation on aquatic ecosystem in tropical estuarine river of thai...
Monitoring of thermal power plant operation on aquatic ecosystem in tropical estuarine river of thailand, 2008-2013
Author : SARAWUTH CHESOH(1) & APIRADEE LIM(1)
ABSTRACT
This study aimed to assess the aquatic ecological impacts of the operation of 750 MW combined cycle power plant in
southern Thailand. About 39,000 cubic meters of raw water in tidal river which connects to the gulf of Thailand has been
drawn daily for cooling system and then thermal effluents are drained back into the river. Aquatic habitat alteration and
biodiversity loss are key environmental concerns that may affect the well-being of the locals. Integrated field surveys
were used for water sampling and data collection. Monthly water quality, heavy metals, fish larvae, and bi-monthly
plankton, benthos and fishing activity in the river were investigated from January 2008 to December 2013. Standard
methods, in situ and laboratory measurements were used for water sample analysis. Species and abundance of
plankton, benthos and fish larvae were examined and categorized.
The results revealed that water quality parameter index can be classified as medium clean, fresh surface water
resources used for consumption, but passing through an ordinary treatment process before using and for agriculture.
Salinity and turbidity gradients showed statistically significant association with living organism variation. An estimated
daily loss of phytoplankton and zooplankton by processing once through a cooling system were about 335 and 5.3 billion
cells (individuals), respectively. In addition, approximate 15 million individuals of fish larvae were destroyed annually
(15% of total upstream). No detectable of chlorinated toxic and heavy metals leakage, massive heated cooling water
was kept in a huge retention pond prior to be drained by gravity into natural waters. However, a change of riverí»s flow
direction, increased potential of saltwater intrusion into the freshwater zone in dry season, and about 3% of annual
upstream fish catch decrease, was identified.
Our findings highlight that the river regime has been regulated mainly by the seasonal phenomena of marine and
riverine effects. Although effluents from the power plant showed no significant effect on water quality of the river, we
suggest that fish population enhancement and mangrove or forest rehabilitation program towards local participation are
desirable. We strongly recommended that further studies and a continuation of ecological monitoring are necessary.
File Size : 240,922 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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