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Komatsu's Environmental and Social Activities Data

Site Data (Japan)  Oyama Plant


Year of Establishment 1962
Location Oyama, Tochigi Prefecture
Main Products Engines for construction/industrial machinery, diesel generators, hydraulic equipment, axle, excimer lasers, etc.
Site/Green Landscape (1,000 m2) 570/118
Number of employees 3,327
Date of ISO14001 certification acquisition May 1997
* The number of employees includes those working for Komatsu affiliates on the premises.
* The number of employees as of the end of March 2013.

Major Performance

Environmental impact Energy consumption
Item Actual value Item Actual consumption Converted to calorie equivalents (GJ)
Total CO2 emissions 51,250 t-CO2 Electricity 74,722 MWh 726,904
NOx total amount 39,464 kg Heavy oil A 166 kl 6,479
SOx total amount 208 kg Kerosene 2,475 kl 90,821
Total emissions of waste 1,716 t Light oil 3,429 kl 130,999
Amount recycled 1,713 t Town gas 3,388 Nkm3 141,952
Recycling rate 99.9 % LPG 41 t 2,038
BOD emissions 4,271 kg Other   1,484
COD emissions 6,973 kg Total   1,100,679
Wastewater 568,800 m3
* Refer to the Data on Environmental Impact Resulting from Business Activities for details on the methods used to calculate amounts.
* Total emissions of waste are expressed as a composite of the amount recycled (excluding valuables) and the amount disposed.
* Recycling rate is calculated by dividing the amount recycled (including valuables) by the amount generated (including valuables).
* Total emissions of BOD and COD are calculated by multiplying the average concentration by the amount of wastewater.

* The heat energy conversion factor is calculated in keeping with Greenhouse Gas Emission Calculation - Reporting Manual, which is based on the act on Promotion of Global Warming Countermeasures.

Compliance Conditions to Major Regulations

Item Unit Facility Regulated value Actual value
Nitrogen oxides (NOx) ppm Diesel engine 950 777
  ppm Gas turbine 70 14
Sulfur oxides (SOx) - K-value regulation 7.0 0.65
Soot and dust g/m3N Diesel engine 0.1 0.029
* Regulated values are in accordance with the Air Pollution Control Law and local regulations.
Item Regulated value according to the Water Pollution Control Law Regulated value Actual value
Maximum Minimum Average
pH 5.8-8.6 5.8-8.6 8.4 7.0 7.4
BOD (Biochemical oxygen demand) 160 mg/l 25 12.5 2.4 7.5
COD (Chemical Oxygen Demand) 160 mg/l 25 17.7 6.2 12.3
Suspended solids (SS) 200 mg/l 50 36.4 1.0 14.0
Mineral oils 5 mg/l 5 1.0 ND 0.6
Copper 3 mg/l 3 ND ND ND
Zinc 2 mg/l 2 0.09 ND 0.06
Nitrogen 120 mg/l 20 9.7 2.5 5.2
Phosphorus 16 mg/l 2 0.5 0.1 0.3
Cadmium 0.1 mg/l 0.1 ND ND ND
Lead 0.1 mg/l 0.1 ND ND ND
Chromium (VI) 0.5 mg/l 0.1 ND ND ND
Trichloroethylene 0.3 mg/l 0.3 ND ND ND
Tetrachloroethylene 0.1 mg/l 0.1 ND ND ND
Dichloromethane 0.2 mg/l - - - -
1,1,1-trichloroethane 3 mg/l 3 ND ND ND
* Regulated values are in accordance with the Water Pollution Control Law and local regulations.
* ND ("not detected") indicates a value below the lower limit of detection.
* ND is considered to be the lower limit of detection when calculating the average.
* Other items are confirmed to be below the regulated value.

* Data for the Oyama Plant include data for the Komatsu Cummins Engine Co., Ltd., the Industrial Power Alliance Ltd., and the GIGAPHOTON, Inc..