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Komatsu's Environmental and Social Activities Enhancing Quality of Life


Promoting Recycling  Effective Utilization of Resources in Manufacturing Operations (Water Resources)

In FY2011, Komatsu set a new medium-term target of achieving a 25% or greater reduction in the amount of water used per unit of manufacturing by FY2015, compared to the FY2005 level. The water-conservation campaign concentrates on manufacturing facilities with extensive groundwater usage located in the Hokuriku District. The Company has achieved reductions in the amount of water used per unit of manufacturing by 52.4% compared to the FY2005 level, through the reuse of water during processing and the elimination of wasteful day-to-day practices.

In particular, the Awazu Plant significantly reduced its groundwater consumption through measures such as adjusting the pump discharge, reevaluating the temperature of cooling water used for heat treatment, and the installation of water-circulation equipment. As a result, the Awazu Plant was able to reduce water usage by more than 75% per unit of manufacturing value.

Also, from FY2014, the goal was changed to a mid-term target value of an over 50% reduction compared to FY2005.

Komatsu will continue efforts to save water resources to achieve its medium-term goals.

■Amount of Water Resources Used and Index Per Units of Manufacturing Value
(Data coverage: Komatsu Ltd. and the Komatsu Group manufacturing facilities in Japan)
(Reflects results of the reviews of the data on KCX for the year of 2009 and earlier)
Amount of Water Resources Used and Base Measurement Units

China: Wastewater Reuse Initiatives

In order to become a model company for environmental protection, Komatsu Shantui Construction Machinery Co., Ltd., is striving to reduce environmental burdens through environmental improvement efforts to fulfill social responsibilities and contribute to regional development.

■A Purification System that Far Exceeds Local Government Emission Standards (Introduced in 2011)

To become a model of environmental improvement in China's Jining district, Komatsu Shantui Construction Machinery Co., Ltd., introduced Membrane Bioreactors (MBR), a purification technology, which is being implemented domestidally in China, combines microorganisms with a filtration membrane. As a result, the quality of waste water was far below the local government emission standards and also river standards (South to North Water Division Project Wastewater Standards).

Wastewater Purification System and Flow

Wastewater Purification System and Flow

■Situation of Wastewater Quality Improvement (COD, BOD, Oil and Fat Content)
Situation of Wastewater Improvement (COD, BOD, Oil and Fat Content)
■Fiscal 2013 Initiatives for Wastewater Reuse

The wastewater purification system described above purified 58% of the water used at plants and the water quality was improved to the allowable level of reuse for farm fields. At the time, water was discarded after treatment and not being reused.

As a company striving for the conservation of water resources and the CEO policy of "becoming the world's No.1 medium-sized hydraulic excavator plant", a new wastewater reuse system was installed for the purpose of social accountability and public interest. Water treated to meet national wastewater reuse standards are further filtered and chemically treated with chlorine dioxide for the use of watering greenery and toilet facilities.

Since operating from October 2013, a total of 12,333 tons of water was reused and in April the recycle rate was improved to 65.3%.

For the future, the efforts will be made to reduce water consumption and achieve 100% recycle rates through initiatives such as improving the summer rooftop fountain system. Also, Komatsu Shantui Construction Machinery Co., Ltd., will continue to make improvements regarding the environment and make contributions for the sustainable development of society.

■Volumes of Waters Consumption by Use (112,000 tons in total for 2012) and Recycling Uses
Volumes of Waters Consumed by Use (112,000 tons in total for 2012) and Recycling Uses
■Wastewater Reuse Volume and Rate from October 2013
Wastewater Reuse Volume and Rate from October 2013