BVT-Merkblatt zu Abwasser- und Abgasbehandlung

Annexes
Extract of Annex 2
32. Installations for the production of acrylonitrile
The waste gas produced by the reactor and the absorber must be burnt. The gaseous emission
produced during the purification products of distillation by reaction and the one coming from
the transfer must be conveyed to suitable abatement systems.
34. Installations for the production of PVC
VCM (vinyl chloride monomer) residues in the polymer must be reduced to minimal values,
especially in the boundaries between open and closed system; the final value is to further reduce
vinyl chloride concentration in the gaseous stream coming from the dryer.
PVC mass flow 10 mg VCM/kg PVC
Homopolymers in suspension 100 mg VCM/kg PVC
Copolymers in suspension 400 mg VCM/kg PVC
PVC in micro-suspension and emulsion of PVC 1500 mg VCM/kg PVC
The gaseous stream coming from the dryer must be used as raw material in a combustion plant,
to further reduce vinyl chloride concentration.
Emissions to Water
Provisions for the water protection against pollution and adoption of the Council Directive
91/271/EEC concerning urban waste water treatment and of the Council Directive 91/676/EEC
concerning the protection of waters against pollution caused by nitrates from agricultural
sources [Decreto legislativo 11 May 1999, no. 152, updated by D. Lgs 18 august 2000, n. 258)].
Emission limit values for wastewater discharges in surface water bodies and in municipal
sewage systems.
Parameter Unit Discharge into surface
water bodies
Discharge into municipal
collecting systems
Discharge into Venice
Lagoon and surface
water bodies of
its draining area (extract)
pH 5,5-9,5 5,5-9,5 6.0 – 9.0
Temperature °C (1) (1)
Colour not perceptible after not perceptible after not perceptible after
dilution of 1:20 dilution 1:40
dilution of 1:10
Odour must not cause nui- must not cause nui- must not cause nuisancesancesance
Coarse material absent absent absent
TSS mg/l 80 200 35
BOD5 (as O2) mg/l 40 250 25
COD (as O2) mg/l 160 500 120
Aluminium mg/l 1 2.0
Arsenic mg/l 0.5 0.5
Barium mg/l 20 -
Boron mg/l 2 4
Cadmium mg/l 0.02 0.02
Total Chromium mg/l 2 4
Chromium(VI) mg/l 0.2 0.20
Iron mg/l 2 4
Manganese mg/l 2 4
Mercury mg/l 0.005 0.005
Nickel mg/l 2 4
Lead mg/l 0.2 0.3
Copper mg/l 0.1 0.4
Selenium mg/l 0.03 0.03
Tin mg/l 10
428 Waste Water and Waste Gas Treatment