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- Path: sparky!uunet!cs.utexas.edu!swrinde!mips!atha!aupair.cs.athabascau.ca!louis
- From: louis@cs.athabascau.ca (Louis Schmittroth)
- Newsgroups: sci.environment
- Subject: Re: Plastic or Paper...which is environmentally correct?
- Message-ID: <2374@aupair.cs.athabascau.ca>
- Date: 15 Aug 92 15:57:18 GMT
- References: <JYM.92Aug7161413@remarque.berkeley.edu> <1992Aug10.194053.8900@nap.amoco.com>
- Organization: Athabasca University
- Lines: 43
-
- In article <1992Aug10.194053.8900@nap.amoco.com>, pgravel@nap.amoco.com (Philip L. Gravel) writes:
- > In article <JYM.92Aug7161413@remarque.berkeley.edu>, jym@mica.berkeley.edu
- > (Jym Dyer) writes:
- >
- > > =o= Mind you, I am aware of toxic wastes involved in the making
- > > of paper bags, but these are far less endemic to the process
- > > than those involved in the making of plastic bags.
- >
- > Excuse me??? Do you know how polyethylene is manufactured? The
-
- ...Excellent summary of on polyethelene manufacturing deleted...
-
-
- > Contrast this with the paper pulp industry. So how are the toxic wastes in
- > making paper paper bags "far less endemic to the process than those involved
- > in making plastic bags"? What are the "endemic" toxic wastes to which you
- > are referring?
-
- If you are talking the brown paper bags, these are made from unbleached
- kraft process pulp -- no toxic wastes involved. The effluent has
- "biochemical oxygen demand" (BOD) which when discharged into a stream
- will deplete the dissolved oxygen, and hance could be considered
- "toxic." If the receiving stream is big enough and the pulp mill has
- been required to treat the effluent, this does not *have* to be a
- concern, although in the past, and in some cases now, it has been
- serious.
-
- Producing white paper bags is another thing. Usually the bleach is
- either CL2 or CLO2, or both, and hence produces organochlorines in the
- effluent. These are "toxic", although there is the argument that at
- the level permitted they are not a threat. BUT, acceptably white
- paper for bags can be produced without using chlorine compounds in the
- bleaching process, and some mills the world are doing just that. In
- a June issue of Der Spiegel there was a two page ad from Soedra Cell,
- the largest producer/distributor of pulp in Europe stating that they
- are offering now TCF pulp -- Total Chlorine Free -- no CL2, no CLO2,
- and that their stated aim is to eliminate chlorine compounds from
- their bleaching processes.
- --
- Louis Schmittroth louis@cs.athabascau.ca
- ========================================
- Not everything that counts can be counted. Not everything that can be
- counted counts. - Charles Garfield
-