Environmental Report 2000 - EnBW

State of the Environment Report
Avoiding waste and recycling secondary raw materials
In accordance with our belief in a closed-loop economy, we subscribe to the principle of
minimising the production of waste and recycling whatever waste is produced. This is a
principle we have fully integrated into our business operations.
Our coal-fired power plants which are
responsible for producing the main
part of secondary raw materials and
waste are a case in point: we have
now achieved a performance where
94% of all waste material can be
recycled. The 217,000 tonnes of kfly
ash and kgypsum collected during
2000 from the kdust separator in
the electric filter or from the kflue
gas desulphurisation unit after due
quality control and certification have
been sold to the construction materials
industry as secondary raw materials.
The gypsum we obtain from the
flue gas purification process has a
particularly sparing effect on the consumption
of primary raw material and
has been given the seal of the “blue
eco-angel” by the Federal Office for
the Environment.
We were able to recycle 57% of the
waste from the EnBW energy division;
however, the refurbishment of the
cooling towers at Heilbronn and
Philippsburg produced a relatively
high, if non-recurrent, quota of nonrecyclable
waste.
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Secondary Raw Materials in t
Ash Granulate
155,334 t
Boiler Sand
14,479 t
Sludge as fertiliser for the farm
Gypsum
61,495 t
Residual Lime
3,554 t
We have also delivered 3,600 tonnes
of certificated sludge to the agricultural
sector for use as fertiliser on the land
and for soil improvement. Gained
from the auxiliary water treatment
unit at the cooling tower of the Heilbronn
plant.
Overview of Main Types of Waste in the Energy Division in %
Rakings
3,400,6 t
Asbestos-based Construction Materials,
Mineral Fibres 5,133,9 t
17.66%
26.66%
16.07%
14.34%
In all our companies we take stock of
the amount of waste produced once
a year and every five years we draw
up a waste management strategy for
minimising and recycling waste. In
this context our treatment and disposal
subsidiary U-plus has a range of
excellent services and cutting-edge
techniques.
To promote graded recycling, we dispose
of the different kinds of waste
in separate and clearly labelled containers,
thus permitting the disposal
of smaller amounts of waste.
This is a principle which doesn’t just
apply to our power plant sites but to
all of our other installations, sites,
companies and administrative offices.
15.31%
9.96%
Metallic Scrap
3,093,8 t
Other Types
2,762,8 t
Construction/Demolition Debris
(excluding asbestos) 2,948,3 t
Sludge from Oil and Water Precipitators
1,917,2 t
Success in reducing emissions of hazardous air pollutants
Industrial sites, power plants, factories and vehicles produce emissions of harmful air
pollutants like sulphur dioxide, nitrogen oxide, carbon monoxide, dust and the greenhouse
gas CO2. It is vital, taking into consideration both the current state of technological development
and the economic and ecological opportunities, to keep these emissions to a
bare minimum.
A few years ago, we invested a great
deal of money in retrofitting our old
coal-fired power plants with flue gas
desulphurisation and denox facilities
whilst all new units were equipped in
line with the latest developments in
environmental technology. This investment
has had a markedly positive
effect in reducing emission levels of
hazardous gas.
We have installed calibrated measuring
devices in our power plant chimney
stacks for continuous emission measurement
to ensure strict observance
of official critical limits. Protocols are
delivered to the authorities. The protocols
of our coal-fired plants at Heilbronn
and Karlsruhe in particular are
compelling evidence of what can be
achieved to cut back emission levels
of sulphur dioxide and nitrogen oxide.
Regression of Specific SO 2 Emissions in Heilbronn and Karlsruhe
in g/kWh
7
6
5
4
3
2
1
0
1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000
Regression of Specific NO 2 Emissions in Heilbronn and Karlsruhe
in g/kWh
7
6
5
4
3
2
1
0
1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000
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