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Tamaki Plant: Environmental Data (FY 2021)

Environmental Performance

Category Unit FY2020 FY2021
Energy use kL per year (crude oil equivalent) 10,218 8,756.9
CO2 emissions t-CO2 per year 18,923 16,112.4
Water use m³ per year 102,185 87,683
Industrial waste generation kg per year 748,026 469,430
Wastewater discharge (water treatment facility) m³ per year 42,150* 33,493.1

 * 11,501.2 m³ was discharged into the river and 30,648.8 m³ was discharged into the sewers. On July 14, 2019, treated wastewater had begun to be discharged into the sewer system instead of the river.

Wastewater Quality

Category Unit Regulatory threshold Voluntary standards Measured values
Average values Maximum values Measurement frequency
Hydrogen ion concentration (pH) mg/L Within the 5.0 to 9.0 range 5.7～8.7 7.2 7.6 Once a month*
Biochemical oxygen demand (BOD) mg/L 600 300 0.9 1.8 Once a month
Suspended solids (SS) mg/L 600 300 2.1 5 Once a month
Mineral oils in n-hexane extracts mg/L 5 5 Less than 1 Less than 1 Once a month
Vegetable oils and animal fats in n-hexane extracts mg/L 30 30 Less than 1 Less than 1 Once a month
Nitrogen mg/L 240 240 4.7 12 Once a month*
Phosphorus mg/L 32 20 0.1 0.54 Once a month*

* Analysis was performed every two hours using an automatic analyzer in addition to the monthly analysis by an accredited measurement laboratory.

Wastewater Quality Total discharge load

(Unit: ton)

Category Total discharge load
FY2020 FY2021
Biochemical oxygen demand (BOD) 0.03 0.03

Foul Odors

Not subject to regulations

Noise and Vibration

No exceedance of standard values

Dusts

No exceedance of standard values

PRTR Substances

(Unit: ton)

Sub-stance No.  Substances subject to reporting Amount handled Amount released Amount transported Other amounts
Released into air  Released Into waterways Released Into soil  Waste Se-wage Recy-cled Con-sumed Re-moved 
30 Linear alkylbenzene sulfonic acids and their salts 2.61 0 0 0 0.01 0 0 2.60 0
31 Antimony and its compounds 1.53 0 0 0 0 0 0 1.53 0
66 1,2-Epoxybutane 0.05 0 0 0 0 0 0 0.05 0
384 1-Bromopropane 0.94 0 0 0 0 0 0 0.94 0
412 Manganese and its compounds 34.9 0 0 0 0 0 0 34.9 0
Total for substances subject to reporting 40.03 0 0 0 0.01 0 0 40.02 0
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