Water Pollutant Discharge Source

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 W Thermal Power Plant Wastewater Reuse in 2018astewater Reuse in 2018

Power  Plant	Water Source	Effluent of Treated Wastewater (tons)	Reuse of wastewater (tons)	Recovery (％)	Remark
Hsiehho	tap water	46,344	35,862	77.38
Linkou	tap water well wate	489,897	356,233	72.72
Tatan	tap water	227,055	167,817	73.91
Tunghsiao	tap water	326,020	189,156	58.02	Reduction in recovery due to the unit renovation and expansion in 2015 and 2016.Then they gradually improve in 2017 and 2018.
Taichung	tap water	734,926	734,926	100
Hsinta	tap water	717,185	648,798	90.46	Due to the heavy rainfall in July and August was collected to the wastewater treatment system, the treatment capacity of the wastewater treatment system increased. However, the amount of recovery and reuse is fixed, so the increase of effulent leads to the decrease of the recovery.
Talin	tap water	308,237	73,053	23.70	The problem of the large amount of wastewater from the test run of the new unit has urged the contractor to start wastewater reduction and recovery improvement . The effluent of wastewater in the fourth quarter of 2018 decreased.
Nanpu	tap water	67,769	23,145	34.15	Due to heavy rainfall in some months was collected to the general wastewater system. And the limited amount of reuse after wastewater treatment lead to increased effulent and reduced recovery.
Chienshan	tap water	6,206	6,206	100
Tashan	tap water	7,819	0	0.00	At present, there is no recycling equipment. When the units # 9 and # 10 are constructed,  recycling ponds will be set up in 2020.
total		2931458	2235196	76.24

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 2018, including the content of hydrogen ion concentration index(PH), suspended solids(SS), and chemical oxygen demand(COD).

Effluent

Power  Plant	Water Discharge (tons/day)	pH	Suspended Solids (SS)	Chemical Oxygen Demand (COD)	Biochemical Oxygen Demand (BOD)
Hsiehho	26.8	7.1	17.3	26.0	9.5
Linkou	363	7.9	5.3	13.6	2.2
Tatan	162	7.6	3.5	28.3	5.7
Tunghsiao	403	8.2	2.9	12.4	3.2
Taichung	546	7.7	4.3	11.0	2.2
Hsinta	888	7.4	3.6	9.6	3.2
Nanpu	122	7.3	4.8	15.4	4.1
Talin	644	7.9	6.0	12.5	1.2
Standards	-	6~9	30	100	30

Thermal Effluent

電廠	Water Discharge (10,000 tons / day)	Water Temperature at the Discharge Point (oC)	the Temperature Difference of Surface Water 500m far from the Discharge Point (℃)
Hsiehho	458	27.3	0.63
Linkou	645	30.1	0.64
Tatan	892	30.2	1.04
Tunghsiao	367	29.2	0.71
Taichung	1,813	31.5	0.71
Hsinta	1,152	33.4	0.65
Nanpu	264	31.5	0.49
Talin	320	33.3	0.81
Standards	-	＜42	＜4

 

 

 

 

 

 

 

 

Water Discharge of Thermal Power Plants in 2018

 

 

 

 

 

Water Discharge of Thermal Power Plants in 2018

 

 

 

 

 

 

 

 

pH of Thermal Power Plants in 2018

 

 

 

 

 

 

 

SS of Thermal Power Plants in 2018

COD of Thermal Power Plants in 2018

BOD of Thermal Power Plants in 2018

Thermal Effluent Discharge of Thermal Power Plants in 2018

Thermal Effluent Temperature at the Discharge Point of Thermal Power Plants in 2018

The Temperature Difference OF Surface Water 500m far from the Thermal Effluent Discharge Point of Thermal Power Plants in 2018