Ingemar,
RE1:
COD is the acronym for 'chemical oxygen demand' and is a measure of how much
oxygen is consumed during waste water ( sewage ) treatment
RE2:
I do not know it under this name ( translation from swedish?) , but it is
probably a measure
of how much a substance inhibits the growth of the bacteria cultures in a
biological sewage
treatment system. The objective is to maintain an active culture by avoiding
waste that is toxic
to the bacterias. It is a tecnical way of ensuring that the municipal system
works optimally, at not
really bureaucracy.....
RE3:
Active carbon is the common method for reducing COD values, but I'm no
expert on this.
Are the carbon filters you mention treating water or air?
In your place, I would ask the Vigon supplier for advise on how best
to improve the quality of the waste water. After all, he supposedly has
an interest in selling the stuff?
regards
Torben Østeraa
GPV Printca A/S
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Ingemar Hernefjord
(KC/EMW)
Sent: Tuesday, March 15, 2005 10:14 AM
To: [log in to unmask]
Subject: [TN] Vigon go-on or gone-Vigon
Dear Mr/Mrs TN,
Our environment government has declared that we must leave the use of VIGON
A200 and use other and less contaminative cleaner. We have installed carbon
filters and other stuff, but the sword hangs over our heads still. Reason
is said to be this: when our process water is added to the commune's waste
water system, our waste water contains too much of COD(Cr) which is 'oxygen
consuming compounds'. Furthermore, the requirements say, that the
'nitrification retardment factor' must be maximum 20% when our contribution
is 20%, and maximum 40% when our contribution is 50%. There is no way out,
they say, we must change to another cleaning process.
Now, all know that a 30 feet long automatic cleaner is quite a lot of money,
and to verify a new process means a lot of money too.
Anyone out there with experience from escaping hungry wolves? I'm not
against environment protection and all that greenish, but in this case it
seems like bureaucracy fulfilness rather than sense.
Q1: after flux removal and water cleaning and drying, what 'oxygen consuming
compounds' can develop?
Q2: what is 'nitrification retardment factor'?
Q3: what more can be done than installing extra carbon filters?
Ingemar Hernefjord
Ericsson Microwave System
PS. Had a long message from our Cyprus man long ago, but he never said
anything about these Vigon disadvantageous properties.
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