# The Environmental Authorisations (Scotland) Regulations 2018, Paragraph 21: Special provisions for combustion plants co-incinerating waste


(1) Cproc is to be expressed as a daily average values (mg/Nm3).
(2) The aggregation rules in paragraph 3 of schedule 21 apply to determining the total rated thermal input of combustion plants.
(3) Half-hourly average values are only needed for the purpose of calculating the daily average values.
(4) Cproc for combustion plants referred to in paragraph 6(1) of schedule 21, with the exception of gas turbines and gas engines, are as set out in Table 6—
Table 6
Cproc for solid fuels with the exception of biomass (O2 content: 6%)
Polluting substance
<50 MWth
50-100 MWth
100 to 300 MWth
>300 MWth
SO2
-
400
300 for peat
200
200
NOx
-
300
400 for pulverised lignite
200
200
Dust
50
30
25
For peat: 20
20
Cproc for biomass (O2 content: 6%)
Polluting substance
<50 MWth
50-100 MWth
100 to 300 MWth
>300 MWth
SO2
-
200
200
200
Nox
-
300
250
200
Dust
50
30
20
20
Cproc for liquid fuels (O2 content: 3%)
Polluting substance
<50 MWth
50-100 MWth
100 to 300 MWth
>300 MWth
SO2
-
350
250
200
NOx
-
400
200
150
Dust
50
30
25
20
(5) Cproc for combustion plants referred to in paragraph 6(2) of schedule 21, with the exception of gas turbines and gas engines, are as set out in Table 7—
Table 7
Polluting substance
<50 MWth
50-100 MWth
100 to 300 MWth
>300 MWth
Cproc for solid fuels with the exception of biomass (O2 content: 6%)
SO2
-
400
300 for peat
200
300 for peat, except in the case of fluidised bed combustion: 250
150 for circulating or pressurised fluidised bed combustion or, in the case of peat firing, for all fluidised bed combustion: 200
NOx
_
300
For peat: 250
200
150
For pulverised lignite combustion: 200
Dust
50
20
20
10
For peat: 20
Cproc for biomass (O2 content: 6%)
So2
-
200
200
150
NOx
-
250
200
150
Dust
50
20
20
20
Cproc for liquid fuels (O2 content: 3%)
So2
-
350
200
150
NOx
-
300
150
100
Dust
50
20
20
10
(6) Total emission limit values (C) for heavy metals (mg/Nm3) expressed as average values over the sampling period of a minimum of 30 minutes and a maximum of 8 hours (O2 content 6% for solid fuels and 3% for liquid fuels) is as provided for in Table 8—
Table 8
Polluting substances
C
Cd + Tl
0.05
Hg
0.05
Sb + As + Pb + Cr + Co + Cu + Mn + Ni + V
0.5
(7) Total emission limit value (ng/Nm3) for dioxins and furans expressed as average value measured over the sampling period of a minimum of 6 hours and a maximum of 8 hours (O2 content 6% for solid fuels and 3% for liquid fuels) is 0.1.

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Source: https://www.legislation.gov.uk/ssi/2018/219/schedule/22/paragraph/21 (the official version)
Page: https://openlegislation.uk/environmental-authorisations-scotland-regulations-2018/schedule-22/paragraph-21
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.