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32 August 2016 E N V I R O N M E N T HM040 MILSON CLEARS AIR WITH EGMONT Milson Foundry Ltd, a local leader in foundry developments recently installed a new classifier for recovery of sand used in mold making. Removal of any impurities and fine dust is critical in recovery of sand for mold making, so that the best quality castings are produced. As part of the process the sand is also aerated in a holding tank and this requires carefully calibrated extraction to draw-off the fine dust particles without removing the good quality sand used for the molds. Egmont Air was called in to evaluate and specify an extraction system to provide the precise level of airflow for the classifier and aerating tank as well as cope with the dust loading generated by the process. Lincoln Davis from Milson Foundry says, “We are very pleased with the performance of the system.” The system incorporated a decantation chamber which separates off the majority of dust before reaching the filters greatly reducing the dust loading and filter maintenance requirements. Cartridge filtration technology was used offering high filtration efficiencies on micron particles as well as durability to provide long-life expectancy and therefore minimal maintenance and operating costs. The fan was positioned on the clean-side of the filters free from abrasive wear. The dusts decant into a drum which can be easily removed for disposal of waste. For a free brochure and more information contact Egmont Air on 0800 781 200 or visit website www.egmontair.co.nz An upgrade of a council sewage treatment plant in Australia certainly proved timely for the local body. The Richmond Valley Council upgrade of its Casino Sewage Treatment plant has paid immediate dividends by withstanding the fury of June’s storms and flooding without suffering any polluting spills or odours. The turnkey upgrade – which included retrofitting of fine screening technology by CST Wastewater solutions – was completed just days before the bad weather along Australia’s East Coast dumped more than 160mm of water on the council region within 48 hours. “The Council couldn’t have timed the upgrade any better. Their foresight and technology upgrade was perfect,” says CST Wastewater Solutions managing director Michael Bambridge. “The Northern Rivers District of NSW is one of the most flood-prone areas outside of the tropics, where events like this are likely to occur and reoccur, so the investment in new technologies has already paid off.” The retrofit project - of a type that is applicable to councils and industrial uses throughout Australia and New Zealand – replaces the previous coarse raked screen design with current fine screening technology. This captures more solids to reduce potential blockages in tanks and downstream equipment, while reducing odours by sealing the inlet works and by the installation of new odour control units. The project’s high-efficiency fine screening SFC technology (screen press for channel installation) is engineered to deliver low-maintenance performance with reduced WHS hazards for municipal and industrial waste water operators. The SFC allows for a much finer level of screening – 5mm compared with typical old systems at 60mm or more – which has led to a significant reduction in solids in the tanks, while producing more efficient treatment with less maintenance The retrofit also involved the installation of an SDS 20 compactor with two inlets - one for each screen - to dewater screenings to 25-30% dry solids. Each screen has an enhanced design capacity of 250L/s flow, providing a total capacity of 500L/s. Technology transplant The original inlet works at Casino STP were designed with a coarse manual raked bar screen system. The functional components of the treatment process downstream of the bar screen receive a high amount of debris, which formerly impacted the efficiency of the treatment process. The original inlet area also received a high amount of odorous gases, which previously contributed significantly to odours emanating from the treatment plant. In addition to minimising these issues, the upgrade project involved fitting new technology into an existing layout, including tailoring the screens to fit into the existing formed channel. The SFC technology involved in the retrofit – designed to lower investment, operational and maintenance costs in screening of municipal and industrial waste water with compacting of extracted solids – has also cut the amount of maintenance and waste that has to be handled by plant operators, reducing operational health hazards and improving OHS performance. The same benefits are widely applicable to other industry and municipal applications, says Mr Bambridge. The technology is also suitable for applications such as food and beverage, manufacturing and processing, mining, energy and resources camps where its low maintenance/high hygiene qualities are appreciated, agribusiness, and remote installations where low maintenance and high efficiency is a priority for users who don’t need to have specialist staff constantly available. “Not only are the tanks clearer and more efficient now, but the screen extractor also operates on level control and is fully automated, eliminating the previous labour-intensive operator handling of screenings,” he says. The robust and proven extractor is constructed SEWAGE TREATMENT UPGRADE WITHSTANDS NATURE’S FURY


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