2.2. Data collection and compilation
This research considered only material cost and energy cost.
Auxiliary materials, such as chemicals, were not included because
they account for less than 1% of mass flow and do not form part of
the company's products. System cost and waste treatment cost
were not included due to confidentiality and limited availability of
data. Data used in the MFCA calculation in this study come from
interviewing the plant manager and engineers in 2013.