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BOC Immingham Dissolved Acetylene Project Environmental Statement: Vol. 2 Main Text Raw Materials and Resources Use and Storage Chemicals 3.71 The main raw materials are carbide and water. Other process related chemicals include sulphuric acid and sodium hydroxide (for the scrubbers), glycol (for the cooling water system for cylinder filling) and acetone (as a solvent for the acetylene). An estimate of raw material and chemical usage is provided in Table 3.1, along with the location where the material is stored and the main form of secondary containments (as applicable). Material Form Usage Calcium carbide Sodium hydroxide Irregular solid lumps (5 mm 80 mm) Table 3.1 Chemical Usage and Storage 3,700 t/yr Storage Method Turnbins (1.8 t) Liquid
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
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