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Hirakata Plant: Environmental Data (FY 2022)
Environmental Performance
| Category | Unit | FY2021 | FY2022 |
|---|---|---|---|
| Energy use | kL/year (crude oil equivalent) | 3,162 | 3,874 |
| CO2 emissions | t-CO2/year | 4,526 | 5,019 |
| Water use | m³/year | 28,665 | 30,655 |
| Industrial waste generation | t/year | 50 | 49 |
| Wastewater discharge (water treatment facility) | m³/year | 15,111 | 15,615 |
Wastewater Quality
| Category | Unit | Regulatory threshold | Measured value |
|---|---|---|---|
| Hydrogen ion concentration (pH) | - | Within the 5.8 to 8.6 range | 7.5 |
| Biochemical oxygen demand (BOD) | mg/L | Less than or equal to 35 | 3.7 |
| Suspended solids (SS) | mg/L | Less than or equal to 70 | 2.8 |
| Normal-hexane extracts | mg/L | Less than or equal to 4 | 1.0 |
Exhaust Air
| Category | Unit | Facility | Regulatory threshold | Measured value |
|---|---|---|---|---|
| Dust and soot | g/Nm³ | AR-1 gas absorption type water cooler/heater | Less than or equal to 0.05 | 0.011 |
| NOx* | ppm | AR-1 gas absorption type water cooler/heater | Less than or equal to 150 | 34 |
* NOx: Nitrogen oxides
Noise
| Time division | Unit | Regulatory threshold | Measured value |
|---|---|---|---|
| Morning (6 am～8 am) | dB | Less than or equal to 50 | 36.1 |
| Afternoon (8 am～6 pm) | Less than or equal to 55 | 48.2 | |
| Late afternoon (6 pm～9 pm) | Less than or equal to 50 | 44.6 | |
| Night (9 pm～6 am the following day) | Less than or equal to 45 | 42.3 |
Vibration
| Time division | Unit | Regulatory threshold | Measured value |
|---|---|---|---|
| Afternoon (6 am～9 pm) | dB | Less than 60 | 39 |
| Night (9 pm～6 am the following day) | Less than 55 | 33 |
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