Page 89 - SD RATCH EN

PM 2.5 alert
RATCH Group PCL.
Sustainability Report 2020
89
Ratchaburi Power Plant has measured fine particulate matter PM2.5 in Ban Chaonua community nearby the power plant, and started measuring PM2.5 in March and September. It found that the level stays in the level that will not cause impacts on the community quality of life and the environment. The measuring will be conducted every year to surveillance air quality situation of the community.
Result of PM 2.5 measurement
Noted : Notification of National Environment Board No.36 B.E. 2553 (2010) : The standard level of particle size less than 2.5 microns in the ambient air
4.2 Wastewater management
Wastewater from power plants and an office building is treated separately. Parts of treated water are reused, for example, to water demonstration agricultural fields and trees. The rest are recycled and reused before discharge to the last water treatment pond. There, the Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) are measured and the results are reported to the Department of Industrial Works through an online system, before being discharged to the natural water channels outside the power plant.
Ratchaburi Power Plant improves the quality of some treated water through the reversed osmosis filter system and reuses the water in the production process. It also checks the quality of water at the discharge point, above and below the discharge point, to ensure that discharged water will not send negative impacts on the natural water channel and that the community downstream can use water safely.
Period
Unit
2020
Standard Level
March (5 consecutive days)
Microgram/cubic meter
23.8
Below 50*
September (5 consecutive days)
19.4
Power plants’ wastewater management procedure
Chemical contaminated water
Resin-washing water
Water from cooling tower
Reusing such as water trees
Waste water from production process
Water Treatment system (SPP facilities use the system of the Industrial Estate
Waste water from office buildings
PH balance adjustment
and lower temperature
Holding pond
Water quality checkpoints
Water trees
Above the water discharge point
At the water discharge point
Below the water discharge point
Retention pond for sedimentation
Water Treatment system