IFAT Trade Show 2012 - Veolia Water Ireland

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page 2 IFAT 2012 Edition Global Soft, uranium-free drinking water leader in water treatment “€2.3 billion revenue in 2011, 10,767 employees worldwide” “Ensured compliance with the revised German drinking water regulation in force since November 2011 with a limit of 10μg/l uranium” The largest Uranex plant so far for removing uranium, and one of the largest Carix plants for partial desalination, is in operation in the waterworks in Windesheim, Rhineland Palatinate, by the Trollmühle association. The geologically-related uranium content of the water is now reduced with the aid of these two ion exchange processes, from an average 14 μg/l to less than 0.1 μg/l. In addition, the overall hardness is reduced from 22° to 12° and the nitrate content from 35 mg/l to less than 25 mg/l. About 42,000 people in 14,000 households in the local area are supplied with 2.1 million cubic metres of drinking water a year. The plant was realised by Krüger WABAG, a subsidiary of Veolia Water Solutions & Technologies. Building work began in August 2010 and the plant was commissioned in October 2011, after only 14 months’ construction time. The planned building time and costs were both strictly adhered to. The moderate increase in water costs for the households is offset by the absence of decentral water softeners and the lower use of detergents and descalers that are harmful to the environment. In addition, the increased demands on the water quality and public health care are taken into account. Finally, compliance with the revised German drinking water regulation in force since November 2011 with a limit of 10μg/l uranium is ensured. www.krueger-wabag.de Serving municipal and industrial clients worldwide through a network of 135 business units, Veolia Water Solutions & Technologies: • delivers engineering and turnkey design & build projects • provides client-tailored water treatment solutions and associated services Services: what we deliver We provide customized best-in-class water treatment service through our expertise and 250 market-leading technologies. Our worldwide network of local business units and specialized knowledge produces added-value service solutions tailored to the unique needs of each client. Value: what we create We’re experts at reusing, recycling and leveraging value from water for clients. We apply a portfolio of cutting-edge technologies to: • treat and reuse wastewater • produce and recover energy • extract raw materials • create valuable byproducts Responsibility: at the heart of everything we do We know that our performance depends on the creativity and commitment of our more than 10,700 employees. Our teams deliver the water treatment solutions that improve quality of life in communities around the world. Our sustainable carbon and water footprint initiatives help clients respond to stakeholder expectations to reduce environmental and resource impacts. Clients and host communities trust us to ensure safety and meet the most stringent performance standards. Veolia Water Solutions & Technologies is a fully-owned subsidiary of Veolia Water, the global benchmark for water services. www.veoliawaterst.com The power of sludge Sludge? Beautiful? Check the dictionary and you’ll find such unflattering descriptors as, “mire,” “muck,” “ooze” and “slush.” Search for synonyms and it only gets worse: “guck (or gook),” “slime,” “slop” and “mud.” But efforts in recent years to improve the sustainability of the wastewater treatment plants that produce sludge is giving rise to a new vocabulary; words like, “fuel,” “bio-solid,” “energy,” “green,” “renewable” and, particularly resonant in these times, “economical.” As municipalities and industrial companies look for new ways to manage increasing waste volumes and control the costs from their wastewater treatment processes, the image of the once-lowly sludge is ascending. Increasingly sludge is being viewed and treated as a source of valuable by-products and agriculturally beneficial ingredients, such as phosphorus extracted from struvite. For many sites, however, the real pay-off comes in the capacity to recover energy. Proven technologies such as anaerobic digestion, thermal hydrolysis, co-digestion or thermal drying are converting sludge/biosolids into a valuable energy source. Veolia Water Solutions & Technologies has long regarded sludge not as a waste but as a resource from which to extract value for the benefit of customers. Veolia applies an array of technologies to custom-design value creating solutions for customers around the world, including: • In Hilleroed, Denmark, the Exelys thermal hydrolysis solution, combined with anaerobic digestion maximizes biogas and green energy production, while minimizing sludge volumes. Thermal hydrolysis uses heat and pressure to break down sewage sludge prior to treatment by anaerobic digestion. This considerably increases the biogas yield and reduces the quantity of sludge for final disposal. Biogas production is increased by as much as 40% and sludge quantities are reduced up to 35%. Local subsidy premiums for green energy also make it possible to sell excess energy for cogeneration. The Exelys process will also be installed at Marquette-Lez-Lille and Versailles, in France. • Another leading thermal hydrolysis technology, Biothelys is being applied to increasingly large projects, including at the Esholt Wastewater Treatment Works in the UK. The biogas generated from the process will be used to run a seven megawatt combined heat and power plant. The digested sludge that is generated can be applied as a fertilizer/soil conditioner for all crops including cereals, vegetables and salads as well as for horticultural applications. • Applying the BioCon® lowtemperature sludge thermal drying process allowed the municipality of Buffalo, Minnesota, to do much more than simply reducing the biosolids mass from its wastewater treatment plant, by 95%; it also resulted in 70-80% savings of the plant’s thermal energy requirements, helping reduce operating costs by 50% (compared to disposal of wet sludge). In addition to generating inexpensive renewable energy, the remaining biosolids are ready for land application. Expressly designed for drying of dewatered sludge from municipal and industrial wastewater treatment plants, the solution utilizes a dual-belt low temperature dryer operating with a temperature range between 80°C - 180°C, reducing the portion of water content in the material to less than 10%. • The Pyrofluid thermal treatment solution oxidizes organic matter contained within sewage sludge in France, Poland and Russia amongst other countries. The solution reduces volumes while it can also generate energy at plants. At Marne-Aval in France, for example, steam from two Pyrofluid furnaces feed an electricity-generating turbine, contributing to meeting the plant’s energy needs. Veolia’s sludge/biosolids expertise doesn’t stop with energy recovery solutions: “we are constantly looking for new ways to derive value and produce materials that are recyclable or reusable. In Brussels, Belgium, for example, we inaugurated a worldunique bio-refinery prototype capable of recovering the components from sanitation plants and vaporizing them into bio-plastics, usable in certain industries”, explains Jean-Marc Philipot, Technical Department Deputy Manager. Veolia also provides advanced control technologies to optimize the environmental and energy performance of facilities; combined with anaerobic digestion, the result is energy neutral wastewater treatment plants…today! www.veoliawaterst.com Exelys energyefficient thermal hydrolysis Biosolids are the largest potential energy source for a wastewater treatment facility, and therefore need to be utilized as effectively and efficiently as possible. Enhanced anaerobic digestion is now the performance benchmark for biogas production, with thermal sludge hydrolysis being recognized as the most effective pre-treatment. However, traditional batch thermal hydrolysis systems are somewhat energy and capital cost intensive. A truly continuous thermal hydrolysis system, Exelys has been developed to overcome these shortcomings while maintaining a high level of effectiveness. Exelys is a simple process: dewatered sludge with a high solids concentration (± 25%, which can be obtained from a conventional dewatering system) is continuously pumped under pressure into the reactor tube. Steam is injected into the sludge, where it condenses and heats the sludge. The sludge flows in a plug-like manner through the reactor tube at a temperature of 165° Celsius and 8 bar pressure with a retention time of at least 30 minutes. This provides the conditions required to hydrolyse the biological sludge and significantly
Hall A3, Stand 139-238 page 3 increase the biogas potential of this fraction of the solids going to the anaerobic digesters. At the end of the reactor tube, the hydrolysate is cooled down, first through a heat exchanger (with heat recovery) and finally by water addition, to reduce its temperature and solids content so that it can be added directly to the anaerobic digestion process. “The Exelys thermal hydrolysis process consumes considerably less energy per unit of solids hydrolysed compared to traditional batch systems, while achieving at least the same level of performance” Due to the continuous operation, high solids content of the feed and an effective control system, the Exelys thermal hydrolysis process consumes considerably less energy per unit of solids hydrolysed compared to traditional batch systems, while achieving at least the same level of performance. Downstream, there are less solids requiring disposal, leading to lower costs. Exelys is a modular system and therefore is very flexible, yet at the same time capital and maintenance costs are reduced. The high temperature and pressures in the reactor tube also produce a sludge hydrolysate that is truly pasteurized. Through its innovative design and continuous operational configuration, Exelys is the most energyefficient technology available for thermal sludge hydrolysis. And due to the unique characteristics of the hydrolysed sludge product, Exelys is the ideal solution for significant increase of the capacity of the existing digestion systems. www.veoliawaterst.com/exelys Water reuse and energy recovery in France The Petite Californie wastewater treatment plant, located in Nantes (Northwest of France) was recently upgraded to treat 71,000 m 3 /day of wastewater, equivalent to 180,000 inhabitants. The upgrade and extension of the plant not only improved the quality of the treated wastewater which is mainly discharged to the Loire River, but also allowed the plant to meet stringent requirements for sustainable development with regards to water reuse and energy recovery. The city of Nantes takes a keen interest in sustainable development and opted for an overall energy efficiency approach which includes biogas production from mesophilic treatemnt of the sludge in the plant’s digesters. Flexible solar panels have also been installed at the plant. In total this covers one third of the power consumption at the wastewater treatment plant, i.e. the energy used for lighting and heating. The residual sludge (12,500 T./year) is recovered for agricultural use after treatment by digestion, a technology which reduces volumes by over 30%, thus minimizing the environmental impact of transportation. The upgrade of the wastewater treatment processes includes Veolia’s patented Multiflo and Biostyr® processes, selected on the basis of their high technical performance, as well as compactness. The treated wastewater is used on-site for cleaning activities and could eventually be suitable for use at the nearby bus washing station. Despite having almost doubled its capacity, the plant’s surface has been reduced by half and the vacant area has been converted into gardens. The architecture of the premises, of a bioclimatic type, combines mineral and vegetal elements, with the creation of gardens inside the building. Fully covered, the plant is also characterized by a minimization of the sounds and olfactory nuisances. A permanent network of Odowatch electronic noses, capable of detecting 64,000 volatile olfactory elements, was installed and enables to mitigate the inconvenience of the odors. “The city of Nantes takes a keen interest in sustainable development and opted for an overall energy efficiency approach for its WWTP” Reduce CAPEX and OPEX with newly designed digesters Sludge is now more and more considered as a resource rather than a waste, so focus is big on sludge treatment and anaerobic digestion. Anaerobic digestion is a highly efficient and widely used method for green energy production and stabilizing of sludge. Digestion converts organic solids into biogas, significantly reducing the requirement for sludge disposal, while at the same time improving its final dewaterability. The biogas produced can be utilized for heat and power production, while disposal costs for the sludge are significantly reduced. Therefore, anaerobic digestion is efficient when it comes to reducing costs and generating income for a wastewater treatment plant. In recent years, Veolia’s Danish subsidiary Krüger has developed a new design for digesters with the main purpose of reducing CAPEX and OPEX while improving the performance of the digester. Key elements of the new design include: • Construction with a flat roof and no headspace in the top concrete part of the digester which results in a significant reduction in CAPEX. The design simplifies the construction and reduces the risk of corrosion of internal digester surface in acidic gas headspace. • Integrated gas cooler (Gas Top) that improves the gas quality, reduces foam overflow and acts as a flame arrester. • Built-in cleaning and maintenance possibilities, e.g. easy cleaning of blocked pipes, removal of sand and grit during operation, safe servicing of overhead mixer and no shut-down of the digester. All these improvements increase the operational reliability and reduce OPEX. The new design is making the civil construction easier and much cheaper. The Gas Top is important to our commitment to Service, Value and Responsibility: Service: Easy maintenance and foam removal Value: Very cost-effective system designed to avoid expensive maintenance Responsibility: Very safe workplace as gas leakages are prevented www.kruger.dk Roche uses energy from wastewater The pharmaceutical company Roche Diagnostics has built a new anaerobic plant for the biological pre-treatment of a partial wastewater flow at the Penzberg site in Upper Bavaria. The plant, which produces energy-rich biogas, supplements an existing membrane bioreactor system. The new anaerobic plant was built by Aquantis, a subsidiary of Veolia Water Solutions & Technologies. The new system pre-treats partial wastewater flows especially rich in carbon as well as biologically degradable liquid waste from the bio-technological production. A 480 m 3 Biobed® EGSB reactor (Expanded Granular Sludge Bed) is used for the biological treatment. In the course of this process energy-rich biogas is produced, collected and processed. The gas is used in a combined heat and power plant to generate both forms of energy. The amount of electricity thus gained will cover more than 90 per cent of the energy requirements of the wastewater treatment plant, and the thermal energy will be used to heat water that supplies a newly constructed local heating pipeline for replacing high energy steam. Further savings will be achieved by eliminating the upstream aerobic high-load step. The carbon dioxide emissions will be reduced by about 1,400 metric tons per year, so that Roche Penzberg will achieve a sustainable reduction of its carbon footprint. The Roche Penzberg plant, with a size of approximately 350,000 m², is one of the largest biotech centres in Europe and one of the leading biotechnology research, development and production centres of the Roche Group. Over 30 years of experience in biotechnological production make the Penzberg site a pioneer in the industrial application of biotechnology. Today, approximately 4,800 people work on site. In addition, the Penzberg facility is the only international centre for the development and production of both diagnostics and pharmaceuticals. Thus the Group’s Personalised Healthcare strategy is part of daily business in Penzberg. Test development for patient stratification and research support work hand in hand with the pharmaceutical scientists to develop products with clear benefit for patients. The goal is to deliver diagnostics and medicines to improve patient’s health and quality of life. www.vws-aquantis.com “The amount of electricity thus gained will cover more than 90 per cent of the energy requirements of the wastewater treatment plant”
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IFAT Trade Show 2012 - Veolia Water Ireland

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