Basic Assessment Report - Transnet

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Transnet LimitedProposed RO Plant: Port of SaldanhaFinal Basic Assessment ReportInitiationPhaseSubmit Notice of Intent to DEATAuthority AcknowledgementCommence and Announce Basic Assessment ProcessComment Period (30 days)Basic Assessment ProcessRelease Draft Basic Assessment ReportComment Period (30 days)Release Final Basic Assessment ReportComment Period (30 days)WE ARE HERESubmit Basic Assessment Report, Application Form andComments and Reponses Report to DEATDecision by AuthoritiesAuthority Acceptance of Basic Assessment SubmissionsAuthority Decision and NotificationAppeal PhaseFigure 3-1: The Basic Assessment Process19Prepared by the PDNA/SRK Joint Venture
Transnet LimitedProposed RO Plant: Port of SaldanhaFinal Basic Assessment Report4 The Proposed Activity4.1 Desalination and Reverse Osmosis TechnologyDesalination refers to a water treatment process whereby salts are removed fromsaline water to produce fresh water. Osmosis is the natural movement of solvent froman area of low solute concentration through a membrane to an area of high soluteconcentration when no external pressure is applied. RO is a separation process used topurify concentrated solutions of dissolved minerals and salts, and is used indesalination plants. RO involves forcing water through a semi-permeable membraneunder high pressure, leaving the dissolved salts and other solutes behind on thesurface of the membrane. The basic RO process (assuming the use of beach/intakewells for intake of seawater) is shown in Appendix B15.4.2 Proposed RO PlantIt is proposed that the RO Plant will generate potable water 4 to the same quality ofthe existing municipal supply to the iron ore handling facility. Immediate waterrequirements at the iron ore handling facility, in addition to the current municipalallocation, is approximately 1 200m³/day (1 RO module) although in the long-term itis planned that the RO Plant will be able to produce a total capacity of 3 600m³/daypotable water (up to 3 RO modules). All infrastructure associated with the RO plantwill be installed during the initial construction phase, although it is anticipated thatonly one of the three RO modules would initially be installed, with subsequentmodules being installed as required, based on the water demands of the iron oreterminal. 5The RO process proposed for this project will use a pump to draw sea water, eithervia a borehole/beachwell or pipeline and this water will be pumped to a sea waterbuffer tank situated adjacent to the RO Plant building with a capacity of 200kl.(Intake via beach wells / boreholes on the quay is the preferred intake method;however intake via a pipeline is a viable alternative and has been included in theassessment.) A high pressure pump will then force the sea water through a semipermeablemembrane (within the RO modules) to remove the dissolved minerals andsalts. This process results in a high salinity solution (brine) and a very low salinitysolution (fresh water). The brine passes through an energy recovery turbine beforebeing discharged back into the sea and the potable water is diverted to the storagereservoir(s), with a capacity of 5 megalitres (Ml), for use (dust mitigation). Chemicalswill be used in the process to treat the intake sea water before it goes through the RO4This requirement is to safeguard the quality of the exported iron ore and avoid contamination of the product by industrialquality water.5Note that the basic assessment and all associated specialist studies have been based on the full capacity of the plant (3modules) in order to ensure that a holistic impact assessment process is followed.20Prepared by the PDNA/SRK Joint Venture
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Basic Assessment Report - Transnet

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