Environmentally Conscious Business Management


Prevention of Air Pollution

Exhaust emissions in 2008 was 7.472 billion m3 (7.461 billion m3 in Japan and 10.5 million m3 outside of Japan), which was a decrease of about 10% compared to last year domestically.

Emission of nitrogen oxide domestically increased by 6.2% compared to last year, while sulfur oxide and ash dust also decreased compared to last year.

q Changes of Annual Emission r
q Changes of Emission per Substance r

Prevention of Water Pollution

Quantity of waste water discharge in 2008 was about 125 million m3 (125 million m3 in Japan and 3,300 m3 outside of Japan).

To protect water resources, we strive to reduce waste water discharge by promoting recycling of water and process improvement, which has resulted in about 2.2% decrease of discharged water in 2008 compared to last year.

Emission of BOD (biochemical oxygen demand) in Japan decreased by 24% compared to last year, while COD (chemical oxygen demand) increased by 4.2%.

q Changes of Annual Waste Water Discharge r
q Emission of BOD and COD r

Control of Chemical Substances (those targeted for PRTR)

We endeavor to reduce disposal of substances targeted by the PRTR (Pollutant Release and Transfer Register) law in each of our plants, based on the law concerning assessing the discharged amount of special chemical substances and promotion of improving their management.

In 2008 we improved the processes in Kosaka Smelting and Refining, significantly reducing the amount of antimony, lead and arsenic.


Cabinet order no. Name of Class I chemical substances Discharged amount Transferred amount
Atmosphere Water area Soil Landfill within our own property Sewage system Outside of each business establishment
1 Water-soluble
compounds of zinc
- 6 - - - 26
16 2- amino ethanol - - - - - 0.3
25 Antimony and
its compounds
0.1 0.3 - 120 - 1
43 Ethylene glycol - 0.05 - - - 5
47 Ethylenediaminetetraacetate - 0.1 - - - 22
60 Cadmium and
its compounds
0.03 0.04 - 71 - -
63 Xylene 0.3 - - - - 7
64 Silver and
its water-soluble compounds
0.1 0.1 - 7 - 0.2
68 Chrome and trivalent chrome compounds - - - 4 - 1
85 R-22 - - - - - 4
89 Toluene 5 - - - - -
100 Cobalt - - - - - 4
108 Inorganic cyanogen compounds - - - - - 0.01
121 R-12 - - - - - 3
175 Mercury and its compounds - 0.0003 - 1 - -
178 Selenium and its compounds 0.1 0.2 - 10 - -
198 tetraazatricyclo - 0.04 - - - 225
207 Water-soluble copper salt - 0.4 - - - 22
217 R-11 - - - - - 9
227 Toluene - - - - - 10
230 Lead and its compounds 0.3 0.01 - 1,100 - 31
231 Nickel - 0.02 - - - 58
232 Nickel compounds - - - - - 0.02
243 Barium compounds - - - - - 16
252 Arsenic and its
inorganic compounds
0.1 0.01 - 665 - 2
253 Hydrazine - - - - - 1
283 Hydrogen fluoride and
its water-soluble salt
1 28 - - - -
304 Boron and its compounds - 7 - - - 11
311 Manganese and
its compounds
- 7 - - - 1.028
179 Dioxine 0.07 0.004 - - - 14.03


Our Main Efforts towards Proper Control and Reduction of the Substances Targeted for the PRTR

  • To set up and manage voluntary control standards that are stricter than the legal standards (Eco-System Sanyo)
  • To reduce lead by switching to production methods/processes that discharge less substances targeted for the PRTR (New Nippon Brass)


2008NWastes generated in 2008 were about 359,000 t (359,000 t in Japan and 0.1 t outside Japan), a decrease of 32% compared to last year. This is due to significant decrease of slag as a result of installation of a new smelting and refining facilities in Kosaka Smelting and Refining.

Wastes consisted of 89% of industrial wastes and 11% of general wastes (business-related). Industrial wastes mainly consisted of sludge (26%), burnt residues (25%), slag (20%) and ash dust (11%). We strive to make improvement and changes by recycling byproducts from our production processes, improving processes and yields as part of our efforts to reduce wastes.

q Changes of Annual Production of Wastes r
q Details about Wastes r
q Details of Industrial Wastes r



In 2008, volume of recycling amounted to 495,000 t (495,000 t in Japan and 0.6 t outside Japan), a decrease by about 23% in Japan compared to last year. This is mainly due to the decreased disposed soil or iron scraps.

Recycling consisted of recycling of materials (91%) and thermal recycling (9.1%). The materials recycled were mainly soil (69%), gypsum (18%) and metals (7.1%). Thermal recycling consisted of shredded dust (71%) and waste plastics (7.9%).

q Changes of Annual Recycling Amount r
q Recycling Method r
q Details of Recycling of Materials r

Greenhouse gases

Emission of greenhouse gases from the entire DOWA group in 2008 was 1.246 million t (1.239 million t in Japan and 7,300 t outside Japan), a decrease of 3.3% domestically compared to last year, while specific emission per sale increased due to the metal price drop.

DOWA Metal Mine has the largest emissions and the next is DOWA ECO-System sharing a large amount of emissions.

On the other hand, greenhous gas is mainly through electricity consumption, accounting for 52% of all emissions.

Emission of CO2 generated from incineration of wastes from outside sources in connection with the environmental business activities accounts for a large amount of our emissions. Annual CO2 emissions caused by wastes from outside sources accounts for 400,000 t since 2004. This type of emission is very difficult to control on the entrusted side. Therefore, we strive to promote thermal recycling using heat generated from burning wastes and use the steam generated for effective use of recycled energy.

We also eliminate ozone-destroying CFC and other CFC substitutes including HFC and PFC that cause global warming, while utilizing the heat generated from burning these wastes. We are also promoting installation of invertors in machines and processes we use, switching part of the fuel we use to natural gas, and introducing of solar power generation equipment.

Furthermore, we encourage modal-shifting of transport to railways and vessels that emit less CO2, more effective collection and delivery of shipments and introduction of low emission vehicles.

q Changes of Annual Emission of Global Warming Gas r
q Changes of Annual Emission of Global Warming Gas (by source) r
q Details of Sources of Global Warming Gas r

Basis for Calculations

Emission factor set forth in the Act on Promotion of Global Warming Countermeasures is used in calculating carbon-dioxide emissions. CO2 emissions derived from wastes are calculated by accepted volume multiplied by the emission factor according to each categories set forth in the Wastes Disposal and Public Cleaning Law. As an emission factor for power generation 0.555 kg CO2/kWh is used, which is a national uniform emission factor set forth in the Act on Promotion of Global Warming Countermeasures. As a result, the figures may differ from those in the Dowa Group Report submitted to administration authorities.

Our Efforts towards Prevention of Global Warming

Energy saving activities Control of the output and RPMs of equipment@@
Production system@@@
Improvement of production efficiency
Switching to high-efficiency lighting equipment
Introduction of the control by inverter@@
Implementation of power generation from wastes.
Introduction of renewable energy

Solar power generation
Purchasing of green electricity
(solar power generation)
Introduction of a heating system using pellets

Switching to energy that produces less greenhouse effect Switching from LPG to electricity
Switching from gasoline and Bunker A fuel to natural gas
Activities related to transportation Switching to transportation by ship or railways
More efficient collection and delivery
Introduction of low emission vehicles
(electric, hybrid and low fuel efficient vehicles)
Other efforts around our workplaces Heat insulating coating on the roofs of plants
Turning light off when nobody is there and conduct energy-saving patrols
Control of air conditioning temperature settings
Stop engine idling


Measures to Fight Global Warming Together!

PhotoIn-house manual

Participating in gTeam Minus 6%h
The DOWA group participated in the national movement of gTeam Minus 6%h, aimed at achieving the goal set by the Kyoto Protocol in June 2008.


In addition to temperature control of air conditioning and implementation of Cool Biz, we use the logo of gTeam Minus 6%h on our business cards or brochures to remind people inside and outside our companies of global warming.


Employees and their families of The DOWA group are committed to fight global warming together. We registered on ECO-FAMILY.JP, the website of an initiative by the Ministry of Environment who has been working as a team since October 2008. Through in-house social occasions and newsletters, we encourage employees and their family members to actively cooperate for environmentally-conscious activities, energy saving and reduction of CO2 at home.