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Hitachi High-Tech Group is very careful in managing the chemical substances it uses. A system to efficiently grasp the amounts of chemical substances generated and moved in each process of its manufacturing flow has been built using an integrated chemical substance management system built and used by the Hitachi Group, to appropriately manage a wide range of chemical substances. The status of atmospheric emissions of volatile organic compounds (VOCs), which cause photochemical smog, is continually monitored, and from fiscal 2016, PRTR substances are also subject to monitoring as substances that have a negative effect on human health and the environment. Year-on-year changes of VOC emissions are provided in the following diagram.
In fiscal 2016, a 57.8% reduction was achieved in atmospheric emissions of chemical substances per unit, against a target of a 44.6% reduction (base year: fiscal 2006).
The business sites of Hitachi High-Tech Group have set voluntary standard values for water, air, noise, and vibration that are stricter than those set by laws and ordinances in their efforts to conserve the living environments of the areas around them.
In the Kasado area of Yamaguchi Prefecture, measures are taken to reduce chemical oxygen demand (COD), which is an environmental indicator for sea areas because it faces the Seto Inland Sea, a place protected by the Special Measures Law for Conservation of the Environment that features the strictest criteria among laws related to the Water Pollution Control Law. More specifically, pollution is prevented by increasing the treatment capacity of night soil septic tanks, replacing old septic tanks that greatly deteriorate the COD value with ones that have larger treatment capacity, through ease of maintenance by consolidating septic tanks and through other measures. Additionally, a central monitoring system has been installed for the real-time measurement of water quality at the various facilities of the factories, thereby enabling minute management of water quality. Factory operation is immediately stopped in case a problem arises. These measures considerably reduce the risk of problems that cause deterioration of water quality.