Water & Wastewater Asia November/December 2020

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54 ON OUR RADAR Australasian deciduous crops such as apples and pears have a clean, green reputation internationally, which extends from growing through to production, and KDS sludge dewatering technology is being used internationally to handle food and beverage waste in an environmentally sensitive manner Sustainable food producer introduces NZ’s first KDS sludge dewatering technology to cost-efficiently reduce waste and environmental footprint A New Zealand food processing company committed to environmental excellence has become the country’s first adopter of a sludge dewatering technology engineered to cost-efficiently reduce the sustainability footprint of food, beverage, and wastewater treatment. The fruit producer is installing a compact and cost-efficient KDS multidisc Roller system from CST Wastewater Solutions to dewater wet sloppy screened waste from the peeling process. This transforms fruit waste from a wet and sticky heavy mass to a much drier product that is less messy, easier to handle, and transport for stockfeed or landfill. of $150 a ton to dispose of, including the specialised transport from the places where trade wastes are generated to centres where compacting, drying, recycling and disposal can take place in controlled environments,” said CST Wastewater Solutions Managing Director Mr Michael Bambridge. The NZ producer – which cannot be named because of contractual confidentiality provisions – is adopting its KDS technology to handle a highly variable quality and volume of up to 5m 3 /h. “This first NZ adopter of the KDS technology had previously tried alternative technologies, but none handled the variable volume involved or dewatered the fruit waste enough to prevent excess water and product from creating an unhygienic site and causing leakage,” said Mr Bambridge. The NZ producer selected a model SS611 KDS with a longer press zone to achieve optimum dewatering of the sloppy and wet mix of peelings, leaves and pulpy fruit material. The technology will reduce volume by up to 90%, thus reducing transport costs and preventing any potential spillages during transport. There are also operational and OH&S benefits with the site being cleaner and easier to maintain, and the financial gain of not paying for transport and disposal of unnecessary water. “Heavy cakes of byproduct from growers and food processors can cost upwards KDS technology with its multi-roller system (above) eliminates sticky, sloppy sludge and spillages by producing a drier, much lighter and hygienic waste that is more easily transported and recycled) (See animation of the rollers here. See a video of the KDS used in fruit processing here.) November / December 2020 • waterwastewaterasia.com
ON OUR RADAR 55 Wet, sloppy waste is eliminated by KDS technology, which produces a lighter, drier, and more hygienic waste product KDS technology is also available in a skidmounted version, pictured above, which can be easily transported by truck or trailer to remote, sensitive or difficult to access sites “The dewatering concept being employed in this instance is to spread the waste over the table width and dewater a mat of material to maximise the surface area and minimise water retention. Waste activated sludge dryness levels are typically 15%-18% dryness. The high quality, Japanese-manufactured stainlesssteel technology: • Uses minimal energy, consuming as little as 0.06kW hr of electricity • Operates at low (63dBa) non-intrusive noise and vibration levels • Does not need water to keep clean, eliminating aerosol OH&S problems • Requires minimal daily maintenance, saving cost and enhancing OH&S performance • Occupies typically half the space or less of conventional dewatering plants • Is engineered to overcome the limitations of technologies such as screw presses, belt presses and centrifuges typically employed by small-to-medium applications to treat the sludge produced by their operations. This lighter, dryer waste it produces – in addition to being easier and cheaper to transport – reduces the need for manual labour in cleaning and transport operations and curtails the need for staff to handle sloppy heavy waste potentially hazardous to health in applications including: fruit and vegetable producers, juice processing and production facilities, food kitchens and catering facilities, as well as livestock, horticulture, agribusiness producing waste during processing of grains, cereals and grapes. The technology is also suitable for municipal and remote industrial worksite waste handling. where its cost-effectiveness and low-maintenance operation is a major advantage where engineering support may be far distant. This is an outstanding application of this globally proven technology, which is eminently suited to the food and beverage processing industry. It also very costefficiently advances the environmental credentials of a significant member of the Australasian fruit industry, which is also a major contributor to the local and export agricultural market,” said Mr Bambridge. The largest KDS unit can handle about 100kg DS (dry solids) an hour at 98% solids capture, explained Mr Bambridge. The KDS technology limits the possibility of spillages on public roads while sludge is being transported, as well as reducing their carbon footprint required to transport the much lighter and more hygienic byproduct. Used for thickening of dissolved air flotation sludge – a very common application throughout wastewater operations – the KDS achieves solids capture of 97% thickened sludge at a dryness of 17%. Pristine Lord Howe Island uses waste treatment technology incorporating KDS technology, which produces drier, lighter and healthier output that is easier to handle November / December 2020 • waterwastewaterasia.com
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Water & Wastewater Asia November/December 2020

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