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BOC Immingham Dissolved Acetylene Project Environmental Statement: Vol. 2 Main Text
Water Use
3.72 The proposed development will use two new water supplies from Anglian Water’s mains water
supply on Hobson Way. The two supplies will be potable and non potable water. The potable
water is a secure supply, whereas the non-potable supply cannot be guaranteed. The water use
philosophy will be to use the non-potable water supply when and where possible. The Anglian
Water supplies will be supplemented by water that is recycled from the process. In addition, (as
described previously) a rainwater harvesting system will collect clean surface water runoff to
augment the supply of process water.
3.73 The water requirements for the process have been estimated at approximately 29,600 t/yr,
approximately 8,660 t/yr of this will be provided by water that has been recycled from the process.
Non-process water requirements are estimated at approximately 860 t/yr. Thus, mains water
usage is expected to be in the region of 21,800 t/yr. In reality water usage will be lower, as these
figures do not account for water that is collected by the rainwater harvesting system.
Electricity
3.74 All equipment involved in the manufacturing and cylinder filling processes will be electrically
driven. Annual electricity use has been estimated at 1,515,035 kWh/yr.
Gas Use
3.75 The site has a requirement for a natural gas supply which will serve the new boiler house, which
will be used for domestic purposes and heating buildings. The new facilities will be connected to
the mains gas supply on Hobson Way. Annual gas usage has been estimated at 71,000 kWh/yr.
Diesel Use
3.76 Diesel use will be limited to firewater deluge pumps and forklift trucks. Diesel will be supplied via
the existing site. The firewater pumps will be on skids with an integral diesel supply built in. The
fire pumps will be run each month for 30 minutes to confirm availability. Total annual diesel use is
estimate to be less than 5 m 3 /yr.
Atmospheric Emissions
3.77 Emissions to atmosphere will consist of acetylene, ammonia, phosphine, hydrogen sulphide and
acetone. Ammonia, phosphine and hydrogen sulphide are only present as a result of the
impurities in the raw carbide.
3.78 An estimate of the likely emissions from the proposed facility has been produced using the EIGA
methodology and spreadsheet 16 for the calculation of air emissions from an acetylene plant. This
gave the following approximate values:
� acetylene 22,000 kg/yr;
� phosphine 1.9 kg/yr;
� ammonia 2.2 kg/yr;
� hydrogen sulphide 0.06 kg/yr; and
� acetone