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90
Sustainability Report 2020
RATCH Group PCL.
Power plants’ water discharge
Power plant
Discharge (cubic meter)
Discharge point
Ratchaburi Power Plant
1,168,601
Khlong Bang Pa, Mae Klong River
Tri Energy Power Plant
17,767
Mae Klong River
Nava Nakorn Power Plant
83,082
Nava Nakorn Industrial Zone’s treatment system
Berkprai Cogeneration Power Plant
240,465
Mae Klong River
RATCH Cogeneration Power Plant
121,274
Given to other organizations as requested
Results of water quality measurement
Indicator
Unit
Ratchaburi Power Plant [1]
Nava Nakorn Power Plant
Berkprai Cogeneration Power Plant
RATCH Cogenertion Power Plant
Target
Royal Irrigation Department’s standard limit [2]
Industry Ministry’s standard limit [3]
Temperature
degree Celcius
31.1
29.5
29.3
-
Not exceeding 40 (only for Ratchaburi Power Plant not exceeding 33)
Not exceeding 40
pH
-
7.5
7.3
7.8
8.3
6.5-8.5
5.5-9.0
Biochemical Oxygen Demand (BOD)
Milligram/liter
3.1
5.8
2.3
5.7
Not exceeding 20
Not exceeding 20
Chemical Oxygen Demand (COD)
Milligram/liter
32
-
29.9
57.3
Not exceeding 100
Not exceeding 120
Total Dissolved Solids (TDS)
Milligram/liter
1,300
274
837
1,628
Not exceeding 1,300
Not exceeding 3,000
Conductivity
Microsiemens/ centimeter
1,011
309
1,410
2,702
Not exceeding 2,000
Unspecified
Note : Biochemical Oxygen Demand (BOD) is the amount of dissolved oxygen needed to dissolve biological organisms. Chemical Oxygen Demand (COD) is the oxygen required to oxidize soluble and particulate organic matter in water. Total Dissolved Solids (TDS) is the dissolved combined content of all inorganic and organic substances.
[1] Quality of wastewater from Ratchaburi Power Plant and Ratchaburi-Power’s Power Plant
[2] The Royal Irrigation Department’s standard is based on Order #73/2011 regarding the prevention and mitigation of low-quality water discharge to irrigation channels and all channels connected with irrigation channels.
[3] Industry Ministry’s standard is based on Ministerial Regulation #2 (B.E.2539), issued under Factory Act BE.2535, regarding the specifications of factories’ discharged water
4.3 Waste management
All power plants emphasize the 3Rs principle in managing waste, to single out reusable and recyclable waste for the production process and other purposes. They also choose disposal methods that reduce waste to landfill as much as possible; for example, using waste as raw materials for the manufacturing of other products or burning in kilns to produce energy. The efforts are to prevent negative impacts on the environment like contamination to soil, surface and underground water, and the food chain.
In 2020, total waste from power generation and office buildings of main power plants like Ratchaburi Power Plant totaled 4,210.48 tons: 3,842.12-ton non-hazardous waste and 368.36-ton hazardous waste. The waste was disposed of through the following approaches: