Water Pollutant Discharge Source
03/14/24
The Water Using Process and Wastewater Recycling Effectiveness of Thermal Power Plants
All TPC thermal power plants have general wastewater treatment systems. We will also ensure by monitoring that wastewater discharge is compliant with the Effluent Standards. Otherwise, we do our best to recycle wastewater in order to enhance water usage efficiency.
Before setting up the discharge facilities, the best discharge method is determined by numerical simulation and hydraulic model tests, in order to reduce the impact of thermal effluent on marine ecology.
Thermal Power Plant Wastewater Reuse in 2023
Power
Plant |
Water Source |
Effluent of Treated Wastewater (tons) |
Reuse of wastewater
(tons) |
Recovery
(％) |
Remark |
| Hsiehho |
tap water |
38,551 |
30,455 |
79.00 |
|
| Linkou |
tap water
well water |
436,977 |
320,441 |
73.33 |
|
| Tatan |
tap water |
242,187 |
196,422 |
81.10 |
|
| Tunghsiao |
tap water |
222,643 |
158,107 |
71.01 |
Unit 2 and unit 3 were overhauled successively in the first quarter, and the unit 1 was overhauled in May. Therefore, the amount of recycled water continuously flushed by the boiler was greatly reduced, resulting in a reduction in the recovery rate in the first and second quarters. |
| Taichung |
tap water |
675,774 |
675,774 |
100.00 |
|
| Hsinta |
tap water |
461,652 |
295,834 |
64.08 |
1. In the third quarter, because the recycling water tank has been replenished to a high liquid level, and there was rainfall in July and August. The utilization rate of recycled water for irrigation and road dust suppression was low. The recycling water was not decontaminated at the recycling rate, resulting in the failure of general wastewater recycling. Reducing the recovery rate.
2. In the fourth quarter, unit 1, unit 2, and unit 4 have been shut down since October, resulting in reduced demand for boiler flushing water and general wastewater recovery as supplementary water for the bottom ash system. |
| Talin |
tap water |
532,684 |
324,891 |
60.99 |
In the fourth quarter, due to the shutdown of the desalination plant in October, the load on the demineralized water plant increased, resulting in an increase in wastewater. In addition, affected by underground water seepage in the coal yard area, the amount of wastewater and discharge increased. |
| Nanpu |
tap water |
72,719 |
25,704 |
35.35 |
1. Unit 4 and unit 3 were successively overhauled in the first and second quarters. The boiler flushing water recovery volume decreased, resulting in a reduction in the recovery rate in the first and second quarters.
2. In the third quarter, due to the heavy rain caused by the typhoon, the runoff wastewater flowed into the wastewater plant and was directly discharged, resulting in a reduction in the recovery rate. |
| Chienshan |
tap water |
7,136 |
7,136 |
100.00 |
|
| Tashan |
tap water |
8,843 |
3,064 |
34.65 |
In the third quarter, the flowmeter calibration at the beginning of the month, the recycled water pipeline was not switched. Therefore some domestic sewage was released. |
Note: The industrial wastewater had excessive salt concentration from the flue gas desulfurization process (FGD). This wastewater was unusable because it could cause serious corrosion and salination of the soil, therefore, it was not counted in the total wastewater.
Monitoring the Quality of Effluent from Thermal Power Plants
The annual average value of effluent water monitoring of each thermal power plant in 2023, including the content of hydrogen ion concentration index(PH), suspended solids(SS), and chemical oxygen demand(COD), etc. The monitoring results all meet the Effluent Standards, as shown in the table below.
Effluent
Power
Plant |
Water Discharge
(tons/day) |
pH |
Suspended Solids
(SS)
(mg/L) |
Chemical Oxygen Demand
(COD) (mg/L) |
Biochemical Oxygen Demand
(BOD) (mg/L) |
| Hsiehho |
21 |
7.9 |
3.6 |
14.6 |
2.5 |
| Linkou |
292.3 |
7.8 |
2.3 |
11.8 |
3.4 |
| Tatan |
124 |
7.4 |
6.5 |
9.7 |
1.9 |
| Tunghsiao |
176.8 |
7.6 |
6.6 |
12.2 |
2.2 |
| Taichung |
641 |
7.8 |
4.7 |
17.2 |
5.1 |
| Hsinta |
839 |
7.2 |
4.0 |
12.2 |
2.8 |
| Nanpu |
129 |
7.5 |
4.8 |
10.3 |
2.7 |
| Talin |
570 |
7.8 |
10.4 |
20.1 |
1.3 |
| Standards |
- |
6 ~ 9 |
30 |
100 |
30 |
Note: pH is the hydrogen ion concentration index.
Thermal Effluent
Power
Plant |
Water Discharge
(10,000 tons / day) |
Water
Temperature at the Discharge Point
(°C) |
the Temperature Difference of Surface Water 500m far from the Discharge Point
(°C) |
| Hsiehho |
229 |
26.0 |
0.05 |
| Linkou |
902 |
30.7 |
0.04 |
| Tatan |
977 |
30.2 |
0.52 |
| Tunghsiao |
796.5 |
30.97 |
0.02 |
| Taichung |
1638 |
30.0 |
0.25 |
| Hsinta |
1127 |
31.85 |
0.1 |
| Nanpu |
260 |
30.7 |
0.72 |
| Talin |
836 |
32.43 |
0.085 |
| Standards |
- |
＜42 |
＜4 |
Note: pH is the hydrogen ion concentration index.
Water Discharge of Thermal Power Plants in 2023
pH of Thermal Power Plants in 2023
SS of Thermal Power Plants in 2023
COD of Thermal Power Plants in 2023
BOD of Thermal Power Plants in 2023
Thermal Effluent Discharge of Thermal Power Plants in 2023
Thermal Effluent Temperature at the Discharge Point of Thermal Power Plants in 2023
The Temperature Difference OF Surface Water 500m far from the Thermal Effluent Discharge Point of Thermal Power Plants in 2023
