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Komatsu's Environmental and Social Activities Enhancing Quality of Life


Environmental Risk Management  Management of Chemical Substances and Pollution Prevention

Reducing the amount of PRTR-related substances

The number of substances covered by PRTR* with a handling volume exceeding 1 ton (0.5 tons or more for Class I Specified) is 23, which one substance has been decreased since last fiscal year. The three substances of xylene, ethylbenzene, and toluene included in paints and thinners account for approximately 94% of the emissions from domestic group production sites. Additionally, most of the emissions are released into the atmosphere.
At domestic Komatsu group production facilities, initiatives such as switching to paint with lower content of PRTR substances, using high-solid paints, improving coating efficiency, and reducing film thickness, are being undertaken for the continuous reduction of transaction volume. Also, for substances with a high transaction volume, transitions are being made by secondary materials including chemical substances with lower impact on humans. In fiscal 2013, the transaction and emission volume was reduced by approximately 9% compared to the previous year.

*PRTR:Law designed to mandate the disclosure of the amount of specific chemical substances released into the environment to promote the management of such substances (The notification system based on the PRTR Law)

Reducing the amount of VOC released

Solvent Recovery Equipment at the Kanazawa Plant

Solvent Recovery Equipment
at the Kanazawa Plant


The majority of VOC emissions are from VOC contained in paint such as ethylbenzene and xylene. In fiscal 2013, emissions were reduced by approximately 1.7% from the previous fiscal year, but the basic unit slightly increased. At the Kanazawa plant, solvent recovery equipment is used to recover and reuse thinner in order to reduce the emission of solvents.

In fiscal 2014, the paint consumption volume will be reduced through the reduction of film thickness to further reduce VOC emissions.

■Workflow
Workflow

Names of Class I Designated Chemical Substances and the Amounts

Released and Transferred from Komatsu Group Manufacturing Facilities in Japan

(handling 1 ton or more, or 0.5 ton or more for Class I Specified Chemical Substances) (applicable PRTR substances from April 2010)

(Unit: t)
Number
under
the
PRTR
Law
Name Amount
handled
Amount released Amount
transferred
Chemically
transformed
or
eliminated
Amount
Contained
in
Products
Air Water Soil Buried Sewage Waste
412 Manganese and its compounds 512.4 1.2 0.0 - - - 13.7 0.0 497.6
80 Xylene 330.8 232.2 - - - - 22.0 74.8 1.8
53 Ethylbenzene 208.1 181.3 - - - - 12.0 14.5 0.3
87 Chromium and chromium
(III) compounds
125.1 0.0 - - - - 1.7 0.0 123.4
300 Toluene 105.9 80.9 - - - - 16.8 5.5 2.7
438 Methylna
phthalene
94.7 0.5 - - - - - 87.8 6.4
296 1,2,4-
trimethyl
benzene
39.9 16.2 - - - - 2.6 21.1 0.0
453 Molybdenum and
its compounds
38.6 0.0 - - - - 0.0 0.4 38.2
448 Methylenebis (4,1
phenylene) = diisocyanate
33.8 0.0 - - - - 0.0 33.6 0.2
308 Nickel 17.2 0.0 - - - - 0.3 - 16.9
88 Chromium (VI)
compounds *1 *2
10.0 0.0 - - - - 2.4 - 0.0
277 Triethylamine 9.5 2.0 - - - - 0.0 7.4 0.0
297 1,3,5-
trimethyl
benzene
9.2 4.0 - - - - 0.7 3.7 0.8
321 Vanadium compounds 8.8 0.0 - - - - 0.0 - 8.8
132 Cobalt and its compounds 7.3 0.0 - - - - 1.0 - 6.3
188 N,N-
dicyclohe
xylamine
5.0 0.3 0.0 - - - 4.3 0.2 0.1
392 n-hexane 4.6 2.0 - - - - 0.0 1.5 1.0
349 Phenol *3 4.1 1.7 - - - - - 2.4 0.0
302 Naphthalene 3.2 1.3 - - - - 0.6 1.3 0.0
207 2,6-Di-tert-butyl-4-
methylphenol
2.8 0.7 0.0 - - - 0.5 0.0 1.6
258 1,3,5,7-
tetraaza
tricyclo[3,
3,1,1(3,7)] decane *3
2.7 - - - - - - 2.7 -
1 Zinc compounds
(water- soluble)
1.3 - - - - - 0.1 - 1.2
83 Isopropyl
benzene
1.0 0.9 - - - - 0.04 0.1 -
*1: During chrome plating, chromium (VI) compounds become chromium compounds. Therefore, the amount transferred and the amount contained in products are entered as chromium and chromium(III) compounds.
*2: PRTR Class I Specified Chemical Substances
*3: Although the amount contained is below the amount that requires registration with the PRTR, we report the data because the amount released exceeds one ton.

Breakdown of the Amount of PRTR-related Substances Released and

Transferred from Komatsu Group Manufacturing Facilities in Japan

Breakdown of the Amount of PRTR-related Substances Released and Transferred at Komatsu Group Manufacturing Facilities in Japan

Amount of PRTR-related Substances Released

from Komatsu Group Manufacturing Facilities in Japan

Changes in the Amounts of PRTR-related Substances Released* at Group Manufacturing Facilities in Japan

Amount of VOC Released from Komatsu Group

Manufacturing Facilities in Japan

Amount of VOC Released by Group Manufacturing Facilities in Japan