INTERNATIONAL CLEANER PRODUCTION INFORMATION CLEARINGHOUSE

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.