After extensive test work and design, mineral processing specialist Multotec Group is commissioning a full scale DeSALx® plant to treat waste water from a flue gas desulphurisation scrubber, at a minerals processing plant in Oman in the Middle East. According to Carien Spagnuolo, Senior Process Engineer at Multotec Process Equipment, the leading edge DeSALx® technology is being combined with more traditional technologies, to achieve water recoveries exceeding 90%.“The pyro-metallurgical antimony plant in which we are installing this facility, is located in a very water-constrained area, requiring a high level of water recovery and permitting no liquid effluent from the site,” says Spagnuolo. “The antimony roaster produces waste water with high levels of heavy metals including antimony and arsenic, which need to be precipitated in a pre-treatment phase.”Based on the Continuous Ionic Filtration (CIF®) process from Multotec’s Australian technology partner CleanTeq Water, DeSALx uses two stages of CIF to desalinate brackish water and enables this effluent treatment process to operate at a much higher water recovery than conventionally possible.“This is achieved when the system is used in conjunction with an upfront precipitation step,” she explains. “This essentially creates a closed loop with no liquid waste production, as the waste from the DeSALx can be routed to the precipitation step.”The CIF system consists of a series of columns – each designed for a specific function: ion exchange and filtration; resin washing; and resin regeneration. In the DeSALx desalination process, a cationic resin is used in the first stage to remove cations from water, while in the second stage an anionic resin is used to remove anions.“Water produced using this technology has low total dissolved solids (TDS) and a neutral pH,” she further explains. “The system is regenerated with sulphuric acid and lime – both low-cost chemicals – producing a brine slurry saturated with gypsum.”The Oman plant comprises two precipitation steps. The first is dedicated to precipitating antimony, arsenic and heavy metals using ferric chloride to remove them from the limestone scrubber blowdown, while in the second step a lime precipitation neutralises the acid quench blowdown and treats the brine or waste produced by the DeSALx system.“Once the streams have been pre-treated in this way, they are fed into the dual-stage continuous ion exchange system to remove the high concentrations of calcium and sulphates,” Spagnuolo says. “This enables the reverse osmosis system to operate at these high water recovery levels.”The water treatment plant, which produces 10 m3/h of potable quality water for re-use within the antimony recovery plant, also includes a Multotec filter press to dewater solid waste.To achieve the optimal design, Multotec conducted a lengthy test work program at its dedicated laboratory in Spartan near Johannesburg. This included simulating the precipitation, continuous ion exchange and filtration unit processes on both a bench-top and laboratory pilot scale.“These tests gave us the basis for our design, while confirming that the proposed process would remove the necessary elements down to the required levels,” she notes. “During the test work, we were able to simulate the effect of changing feed conditions on the DeSALx system – proving its ability to adjust effectively to these variable conditions.”The project installation has been completed and commissioning is in progress, with final commissioning expected to be completed in Q4 2018.As the main contractor for the project, Multotec worked with other water treatment technology providers to supply a complete water treatment solution. DeSALx is marketed and distributed by Multotec on behalf of its Australian partners CleanTeq Water.
Updated: 2.25pmJONNY SEXTON — WHO was this morning named in the starting XV for Ireland’s trip to Rome — has now been ruled out.Sexton was hurt in training this morning, going over on his foot, though Declan Kidney insisted the Paris-bound kicker would be okay. Not so.“A scan has confirmed that he has torn a tendon in his left foot and is therefore ruled out this weekend,” an IRFU statement reads.Ian Madigan is now promoted to the replacements as Paddy Jackson starts. Craig Gilroy returns on the right wing after overcoming a groin strain, replacing rib-fracture victim Fergus McFadden.The pack is unchanged from the team that started against France with lock Donnacha Ryan being passed fit after sustaining a shoulder injury in that game. Devin Toner is on the bench in place of veteran second row Donncha O’Callaghan however.“The Italian line-out is going really well and I thought tactically it’d be good to cover off that area,” explained Kindey at the team’s base. “Devin has been going really well in training too. It’s extremely disappointing for Donncha but it’s just on the balance of things what I think we’ll need.” Ireland have never lost to Italy in the Six Nations with their last defeat to the Azzurri coming in 1997 before they joined the tournament.Victory in Rome, combined with France defeating Scotland in Paris, would give Ireland third-place – a reasonable return given the number of injuries they have endured in the championship. But defeat, combined with a French win, would thrust them into contention for the wooden spoon.Asked to sum up the championship so far, from an Irish point of view, Kidney added: “It’s been frustrating in terms of results. And in terms of creating opportunities and not finishing them off. But they’ve been working really hard, they’ve been a joy to work with and sometimes you’ve just got to work through these things in life. If we weren’t creating stuff we’d say okay, we have to go back to the drawing board but it’s like that at all.”Ireland (15-1): Rob Kearney; Craig Gilroy, Brian O’Driscoll, Luke Marshall, Keith Earls; Jonathan Sexton, Conor Murray; Jamie Heaslip, Sean O’Brien, Peter O’Mahoney; Donnacha Ryan, Mike McCarthy; Mike Ross, Rory Best, Cian Healy.Replacements: Sean Cronin, David Kilcoyne, Stephen Archer, Devin Toner, Iain Henderson, Paul Marshall, Paddy Jackson, Luke Fitzgerald.- additional reporting AFPWhat do you think?O’Driscoll and Sexton named in starting line-up to face ItalyCampaign to retain Declan Kidney for 2015 World Cup gathers momentum