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Waste management
# Environmental assessments
Living Environment Impact Assessment Relating to an Incineration Facility for Low-Concentration PCB Waste, etc.
ClientPrivate company (industrial waste management)
LocationOkayama Prefecture
We conducted a living environment impact assessment for the installation of a new incinerator (for incineration of low-concentration PCB waste, etc.) in an existing waste incineration facility. We discussed assessment items and methods with prefectural officials and conducted a one-year on-site study. We then predicted and assessed the scope and degree of the incinerator’s impact based on the study’s data and the project plan.

PROJECTProject outline

The assessment covered air quality, noise, vibration, and odor associated with the facility’s operation. We conducted studies, and made predictions and assessments of each item and prepared a report concluding that the facility will not have an impact on the surrounding living environment. We explained our conclusions to local governments and others, and then applied for permission to install the incinerator.
The area around the project site has a complex topography. Additionally, there are three communities nearby, each lying in a different direction from the facility. In the view of these considerations, we set up survey points to monitor air quality in each of the three communities and conducted a study in each season. As a result of the atmospheric diffusion simulation of stack exhaust gas, the maximum landing concentration of some items exceeded standard values. We therefore presented results (gained from on-site studies made during the existing incinerator’s operation and simulations) showing that exhaust gas landed in nearby mountains before it was diffused in a certain wind direction, that those landing locations were not habitable, and that there were almost no impacts on the nearby communities.
Due to the area’s complex topography, predictions of long-term average occasionally produced irregular results that exceeded predictions of short-term maximums. However, we were able to obtain the prefecture’s understanding with respect to atmospheric diffusion at the planned project area, including the fact that standard values may be exceeded, by explaining variations in atmospheric diffusion and ground-level concentration that come from the topography and stack height and performing some simple diffusion calculations.
Comment from the person in charge

It is not unusual for environmental standards to be exceeded when conducting simulations based on a project plan as it is. We do not simply make mechanical assessments by inputting data into simulation software. Instead, by considering a variety of factors―In what ways is the prediction formula significant? How will the prediction conditions be reflected in the results? Are there any other influencing factors besides those of the prediction formula? Are the prediction conditions excessively conservative? Is comparison with the assessment standards appropriate? And what environmental safety measures are being taken? Then we draw on the latest expertise and our experience to make the best assessment.

Description of the project presented in the example


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