Water Journal : Water Journal September 2013
water september 2013 38 Feature article In order to reduce the cost as much as possible, several funding sources were used for the project. Government grants, council and winery funds were utilised, with the remainder coming from project equity delivered by TRILITY. The project was also broken up into four separate contracts for earthworks, pipelines, lagoon liners and MEI and Process. Three contractors were engaged. The Lion Co AusTrALiA WAsTeWATer reCyCLing PLAnT As one of Brisbane’s largest water consumers, Lion Co Australia has been proactive in reducing its impact on the city’s water infrastructure with support from TRILITY in an operation and maintenance contract. Lion Co Australia’s 3.8ML/day wastewater recycling plant uses microfiltration and a reverse osmosis membrane system and is located within the company’s Castlemaine-Perkins Brewery in Milton, Brisbane. The company is one of Australasia’s leading beverage companies with operations in Australia and New Zealand and is engaged in the production, marketing, sales and distribution of beer and other beverages in both countries. The effects of drought and climate change on water sources have been particularly severe in the high growth region of South-East Queensland. Lion Co Australia has been proactive in managing its water sources and sought a solution to reduce its mains water intake. The plant treats trade waste effluent to produce high quality water suitable for reuse within the brewery, incorporating a complex design of traditional wastewater treatment technologies to produce an intermediate system suitable for further treatment in its integrated membrane system of microfiltration and reverse osmosis. The plant also produces a biogas suitable for partially replacing the town gas necessary for the operation of the site’s steam boiler, thus further reducing the carbon footprint of the site. ViCTor hArbor WAsTeWATer TreATmenT PLAnT Back in South Australia, on behalf of SA Water, TRILITY designed, built, financed and now operates and maintains the Victor Harbor Wastewater Treatment Plant in the popular coastal town located on the Fleurieu Peninsula 90km south of Adelaide. The project includes a wastewater treatment plant (commissioned in 2005), pumping stations and storage reservoirs to deliver recycled water suitable for unrestricted irrigation of private gardens, community parklands and golf courses. On completion, the Victor Harbor WWTP was the largest double-deck Submerged Membrane Bioreactor (SMBR) plant built in Australia. In 2011, the plant was upgraded to accommodate Department of Health regulations and further reuse options, as well as catering for Victor Harbor’s population swell during the holiday season. The new treatment plant had to cope not only with these peak seasonal loads, but also replace ageing and overloaded infrastructure. The plant design concept incorporates several staged upgrades to financially align it with population growth in the region. The Wastewater Treatment Plant (WWTP) and ancillary infrastructure treat sewage to six-log virus removal, incorporating the SMBR process fitted with Kubota flat-sheet membranes. The SMBR process involves multi-point load balancing with the addition of carbon from liquid sugar and alum precipitation for enhanced denitrification and phosphorus removal, respectively. Pathogens are removed by membrane filtration and the treated effluent is then subjected to ultraviolet disinfection and a chlorine contact time of more than 30 minutes before being delivered to the finished water storage lagoon. The agreement also involved the construction of pump stations and approximately 13km of pipelines to enable storage of the reclaimed water in the Hindmarsh Valley reservoir, an unused basin that SA Water re-commissioned. The treated effluent is suitable for the unrestricted irrigation of crops, parks and gardens and is delivered by a controlled gravity reticulation network system. The nutrient concentration of the treated wastewater, as required by the Environment Protection Authority (EPA), is one of the tightest specifications in Australia, to allow winter discharges to the sensitive Inman River catchment. The plant was originally designed to utilise polymer sludge thickening and clay-lined lagoons to dry the waste-activated sludge. High rainfall caused these lagoons to become overloaded and emit objectionable odours. This led to complaints from neighbouring residents, financial penalties and a letter from the EPA requesting immediate and permanent actions. The operations team worked to find a temporary solution to immediately mitigate the odour, as well as a permanent, sustainable solution for the remaining operational years. Water-capping was the most effective method for immediate odour mitigation and provided extra time to implement the permanent solution of decommissioning the sludge thickener and installing underdrains. Not only did these upgrades significantly reduce sludge drying time and odour, but they were more environmentally sustainable, more cost effective, reduced overall power consumption and enabled the plant to provide more reuse water to the community. WAikerie WAsTeWATer sCheme The Waikerie Wastewater Scheme in South Australia’s Riverland was instigated because the original wastewater treatment lagoons were located on a River Murray floodplain and were overloaded. A new solution was required to remove the risk of flooding, while also preparing for future growth and a sustainable long-term disposal path. With only 1,100 connections, the financial viability of the project was a challenge, requiring innovative solutions. A new wastewater treatment plant was designed and built, in addition to the upgrade of an existing pump station and the construction of a 40-megalitre capacity recycled water storage lagoon, as well as the installation of a pipeline for the recycled water. The facility is a purpose-built aerated biological WWTP that provides treated water in compliance with the Department of Health and Environment Reclaimed Water Guidelines for Class B treated effluent, which is then used for irrigating the local golf course. The plant is operated in accordance with EPA and Department of Health approvals, with regular sampling undertaken to verify performance. WJ The AuThor robran Cock (email: email@example.com) is TRILITY’s Regional Operations Manager – SA/ WA, where he is responsible for service delivery. Robran is a professional engineer with a Masters Degree in Civil and Environmental Engineering and a Bachelor of Chemical Engineering with honours. He also has undergraduate qualifications in science and an MBA from the University of South Australia.
Water Journal August 2013
Water Journal November 2013