Case Study #256
1. Headline: Internal recycling at a French resin and
terpine manufacturer
2. Background: Les DÆrivÆs RÆsiniques et TerpÆniques (DRT)
carried out an environment audit on their production and
pollution removal units in 1992. The inventory and
characterization of the effluents led to the
implementation of a programme to decrease the COD
polluting flow by 30 %, within the framework of an
agreement with the River Agency, concerning the decrease
in effluents. This case study was carried out in 1992.
3. Cleaner Production Principle: Internal recycling
4. Description of Cleaner Production Application:
Information about the process and wastes
In the polyterpenes workshop a polymerization of alpha
pinene is carried out by means of aluminum chloride in
solvent phase. The process consists of washing with acid,
and discharging effluent, loaded with aluminum chloride,
oil, and hydrochloric acid, (about 2m3/h) into the sewer.
The company put in place :
--recycling waters so that they can be reused as a
flocculating agent in the treatment plant, and
--recycling the organic solution.
The decrease in discharges reaches 50 m3/d ; 28 tons of
oil are recovered a year and the COD load is decreased by
20 %.
The chlorinated water coming from the settling processes
can carry away an emulsified phase of resins and
chlorinated water. The settling tank breaks this emulsion
and enables the oily organic phase to be recovered.
Level of marketing
Material / energy balance and substitution
Recovery of 28 t/year of terpenic oil.
5. Economics:
Cost of direct investment
Settling tank 175 000
Equipment 237 000
Total 412 000 FF (1992)
6. Advantages: Besides the decrease in the pollution sent to
the treatment plant, this technology avoids a phenomenon
of anarchic flocculation in the collectors due to the
discharge of aluminum chloride. The organic phase is
recycled in the process.
7. Constraints: The chlorinated waters are acid and warm.
The equipment must be made of PVDF or PVC to prevent
corrosion.
8. Contacts:
Agence de l'Eau Adour-Garonne
M. GARIADOR
TEL: 33 61.36.37.38
M. LAGUIAN
In Charge of the Environment - DRT
Les DÆrivÆs RÆsiniques et TerpÆniques
40560 VIEILLE-SAINT-GIRONS - France
TEL: 33 58.47.95.95
FAX: 33 58.47.95.50
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: France, aluminium chloride, oil, hydrochloric,
ISIC 3515, chemical, terpene, recycling, COD, chlorine,
acid
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.