CASE STUDY #250
1. Headlines: Internal recycling in a chemical manufacturer
reduces effluents.
2. Background: The Manufacture Landaise des Produits
Chimiques manages a general sewerage programme launched in
1992, including the implementation of clean processes in
order to reduce the discharges. Within this framework,
they plan to recycle GUANIDINES wash water. This case
study was carried out in 1993.
3. Cleaner Production Principle: Internal recycling
4. Description of Cleaner Production Application:
Information about the process and wastes
Cyanogen chloride is synthesized from gas chlorine and
sodium cyanide in solution. The gas cyanogen chloride
obtained is purified by washing with water before being
used for the GUANIDINE synthesis.
A draining machine separates the raw GUANIDINE from the
mother liquor with a clean water supply which generates a
discharge of 9 m3/d i.e. 96 kg/d of COD at pH 8.
The project recovers the wash water and recirculates it
into the manufacture.
Material / energy balance and substitution
BEFORE
AFTER
Volume of effluents 9 m3/d 0
COD 96 kg/d 48 kg/d
5. Economics:
Cost of direct investment
Water collection 330 000
Recirculation 200 000
Total 530 000 FF (1993)
6. Advantages: Suppression of effluent. Decrease in COD by
50%.
7. Constraints: No information provided.
8. Contacts:
Sources of information
Agence de l'Eau Adour-Garonne
M. GARIADOR
Tel: 33 61 36 37 38
M. GRARD
In Charge of the Environment
M.L.P.C.
40370 RION DES LANDES
Tel: 33 58.57.10.16
Manufacture Landaise des Produits Chimiques
40370 RION DES LANDES - France
Tel:33 58.57.02.00
Fax:33 58.57.02.05
M. Maton
M. Chatenet
Office International de l'Eau
Direction de la Formation et des Etudes
rue Edouard Chamberland
87065 Limoges Cedex, France
TEL: 33 55114770
FAX: 33 55777115
9. Keywords: ISIC 3511, France, chemical, recycling,
cyanogen, guandine, draining, COD
10. This case study was submitted to UNEP IE in 1994 by the
French Office International de l'Eau. It has not undergone
a formal technical review.