Division BAT 81: In order to reduce emissions to water of PCDD/F and copper from the oxychlorination process, BAT is to use technique a. or, alternatively, technique b together with an appropriate combination of techniques c., d. and e. given below.

United Kingdom

Technique		Description	Applicability
*Process-integrated techniques*
a.	Fixed-bed design for oxychlorination	Oxychlorination reaction design: in the fixed-bed reactor, catalyst particulates entrained in the overhead gaseous stream are reduced	Not applicable to existing plants using the fluidised-bed design
b.	Cyclone or dry catalyst filtration system	A cyclone or a dry catalyst filtration system reduces catalyst losses from the reactor and therefore also their transfer to waste water	Only applicable to plants using the fluidised-bed design
*Waste water pretreatment*
c.	Chemical precipitation	See Section 12.2. Chemical precipitation is used to remove dissolved copper	Only applicable to plants using the fluidised-bed design
d.	Coagulation and flocculation	See Section 12.2	Only applicable to plants using the fluidised-bed design
e.	Membrane filtration (micro- or ultrafiltration)	See Section 12.2	Only applicable to plants using the fluidised-bed design

Table 10.4

BAT-AEPLs for emissions to water from EDC production via oxychlorination at the outlet of the pretreatment for solids removal at plants using the fluidised-bed design

Parameter	BAT-AEPL(average of values obtained during 1 year)
Copper	0,4–0,6 mg/l
PCDD/F	< 0,8 ng I-TEQ/l
Total suspended solids (TSS)	10–30 mg/l

The associated monitoring is in BAT 79.

Table 10.5

BAT-AELs for direct emissions of copper, EDC and PCDD/F to a receiving water body from EDC production

Parameter	BAT-AEL(average of values obtained during 1 year)
The lower end of the range is typically achieved when the fixed-bed design is used.
The average of values obtained during one year is calculated from the averages of values obtained during each day (at least three spot samples taken at intervals of at least half an hour).
Purified EDC is the sum of EDC produced by oxychlorination and/or direct chlorination and of EDC returned from VCM production to purification.
Copper	0,04–0,2 g/t EDC produced by oxychlorination^f1
EDC	0,01–0,05 g/t EDC purified^f2 ^f3
PCDD/F	0,1– 0,3 μg I-TEQ/t EDC produced by oxychlorination

The associated monitoring is in BAT 79.

Annotations

Footnotes

f1: The lower end of the range is typically achieved when the fixed-bed design is used.
f2: The average of values obtained during one year is calculated from the averages of values obtained during each day (at least three spot samples taken at intervals of at least half an hour).
f3: Purified EDC is the sum of EDC produced by oxychlorination and/or direct chlorination and of EDC returned from VCM production to purification.