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Program for North American Mobility in Higher Education Introducing Process Integration for Environmental Control in Engineering Curricula. Module 3: Environmental Challenges – Pulp & Paper Industry Caroline Gaudreault Created at: École Polytechnique de Montréal & Texas A&M University, 2003.
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Module 3: Environmental Challenges – Pulp & Paper Industry
École Polytechnique de Montréal &
Texas A&M University, 2003
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Tier III: Statement of Intent
The purpose of this is to provide students with an open-ended problem which assimilates the concepts of minimum impact manufacturing including process integration and LCA .
You are an environmental engineer in a pulp and paper mill. The head office wants to enhance its competiveness by putting together a technology roadmap with the ultimate goal to be a minimum impact manufacturing mill.
Some information about the mill is given at the following page.
A few months ago the company as ordered a partial LCA study in order to have an idea about its life cycle environmental impacts. As a first step, your boss ask you to look at this study as well as at the mill simulation and make him your recommendations for environmental improvement. To do this look at unit process contribution to each impacts and perform sensibility analysis. Do not use any normalization or weighting. Without doing calculations, you can also use cost arguments. Also determine, by mass balances by how much fresh water can be theoretically reduced (by recycle).
System boundaries are defined in the LCA study and the main hypothesis are presented next pages.
The total fresh water consumption is 9.33+0.97+3.83+20.66=34.79 ton/ton of dry pulp.
Only liquid water can be “directly” recycle: 0.967+5.92+0.681+20.66= 28.23 ton/ton of dry pulp.
For mass conservation reasons, only the min of fresh water or liquid effluent can be recycle ie. 28.23 ton.
So the minimum water consumption is 34.79-28.23=6.56 ton (ie a reduction of 81%).Solution – Q1 (Cont’d)