Global

Home > Environment > Greening of Process > Management of Chemicals: Reduction in the Amount of Chemical Substances Handled 

Environment

Committed to People, Committed to the Future.

Reduction in the Amount of Chemical Substances Handled

Results of FY2015 and future initiatives

In FY2015, electronic devices as well as power and social infrastructure systems accounted for over 90% of the total amount of chemicals handled, with substances used for chemical reactions and wastewater treatment raking high among chemicals. The material balance for PRTR-covered chemicals indicates that 37% of them are removed through coagulation and absorption and 58% are consumed together with the products that contain them, which taken together represent the majority of the chemicals handled. It also indicates that only about 1% of the chemicals used are discharged into the atmosphere or hydrosphere. Under the Fifth Environmental Action Plan, the Group is aiming to reduce the amount of chemicals handled per unit production by 16% compared to the FY2010 level in FY2016.

Amounts of substances targeted for reduction handled
[Image] Amounts of substances targeted for reduction handled

Breakdown of the amounts of substances targeted for reduction handled (FY2015)
[Image] Breakdown of the amounts of substances targeted for reduction handled

Amounts of top five substances targeted for reduction handled (FY2015)
[Image] Amounts of top five substances targeted for reduction handled

To Top

Case Study: Improving efficiency in reducing the amount of gases and chemicals by visualization and abnormality detection

Oita Operations, Toshiba Corp.

Toshiba Corporation's Oita Operations has developed a tool (iCAS: Integrity Cost Analysis System) designed to clarify the optimal (theoretical) amounts of gases and chemicals required for processing in semiconductor manufacturing and to visualize and analyze disparities between the theoretical amounts and amounts actually used.
iCAS enables the differences between theoretical and actual amounts of gases and chemicals to be grasped, thereby helping reduce emissions.

[Image] Universal system accessible to a wide range of users, from managers to production line operators
Universal system accessible to a wide range of users, from managers to production line operators

[Image] Implementing an improvement cycle with iCAS

To Top

Case Study: Paint process cleaners: Reduction in the amount handled by recycling for reuse

[Image] Paint process cleaners: Reduction in the amount handled by recycling for reuse

Toshiba Industrial Products Asia Co., Ltd.

In Vietnam, waste thinner used to clean hanging tools, spray guns, and jigs used in the paint process was commissioned to a cement manufacturer for thermal recycling. In order to reduce both the amount of thinner used and waste thinner treatment costs, the company introduced thinner recycling equipment and began to recycle thinner for reuse. This enabled the company to reduce the amount of new thinner used by about 440 liters per month compared to the pre-introduction level. In addition, the amount of waste thinner discharged was reduced substantially, reducing waste thinner treatment costs by approximately 160 US dollars per month.

To Top

Case Study: Reduction of the amount of chemicals handled through reuse in semiconductor photolithography

Yokkaichi Operations, Toshiba Corp.

[Image] Reduction of the amount of chemicals handled through reuse in semiconductor photolithography

Toshiba had been outsourcing the collection of waste chemicals used in semiconductor photolithography to collectors and had been using newly purchased liquids in all processes. In order to reduce the amount of chemicals used, we reviewed the levels of purity required for different processes and identified those processes in which recycled chemicals having lower purity than new liquids could be used. Also, by adjusting the mixing ratio of waste liquids collected from manufacturing processes, which contain different elements, we reduced the workload required for distillation and purification, thereby facilitating delivery of recycled products that meet purity specifications. Toshiba outsources distillation and purification of waste liquids to outside contractors. These measures made it possible to reduce purchases of new liquids by 10%. We are evaluating the possibility of using recycled chemicals in a wider range of processes.

To Top