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NA AG at the Hamburg site can report excellent achievements in environmental protection, both as regards the consumption of potable water and wastewater cleaning.
Saving of groundwater as a resource
Water is primarily needed for cooling purposes. We use water from the River Elbe for this, part of which we feed into cooling circuits and part into the open cooling systems. Since commissioning our own river water treatment installation in 2002, we use Elbe water as well for the production of sulphuric acid and other processes which formerly required potable water, such as steam generation. Thus, our potable water consumption has almost halved since 2002. In fiscal year 2003/04 we recorded an increase in potable water consumption due to a plant stoppage for repairs and maintenance.
Discharge of wastewater
The separation of very differently contaminated wastewater flows enables the wastewater to be optimally cleaned. Norddeutsche Affinerie AG therefore operates four different wastewater systems:
- for cooling water: cleaning inasmuch as needed ¨ discharge into the River Elbe
- precipitation that falls on the works precincts: chemical/physical cleaning in two plants ¨ discharge into the River Elbe
- process wastewater: multi-stage chemical/physical cleaning ¨ discharge into the River Elbe
- domestic wastewater ¨ feeding into the municipal sewerage network of the City of Hamburg, cleaning performed by the City of Hamburg
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Accordingly, we differentiate between indirectly and directly discharged wastewater. The cooling water as well as process wastewater and precipitation that are cleaned in our wastewater treatment plants are discharged direct into the River Elbe. Water samples are taken regularly from the individual wastewater flows and analysed. Specific emissions were reduced further in 2006 and reached a very low
level.
The remaining wastewater from the works (sanitary sectors, kitchens, etc.) are channelled into the municipal sewerage network as dirty water. The quantities of this indirectly discharged dirty water at 60.000 to 70,000 m3 p.a. have stayed at a constant low level since 2000.
For the Lünen site, it is planned to collect, treat and use the precipitation water as process water for cooling purposes. This should reduce the potable water consumption in Lünen in future. |
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German
