Water / Wastewater Treatment New Line of Agitators Launched


With a new line of top-entry agitators, ITT now offers broadest range of wastewater mixing solutions. The Flygt Top-Entry Agitator is specially designed for demanding denitrification, digester and sludge mixing applications. They round out the mixing solutions portfolio from the company that pioneered the first submersible mixers over three decades ago.


Engineered for energy efficiency, hygienic handling, and ease of installation and service, Dieter Neitemeier, marketing director for biological treatment at ITT’s Water & Wastewater business, said the three top-entry models were developed to offer additional reliable and efficient choices to serve customer needs. Aside from increasing regulation, Neitemeier said, a big challenge municipal wastewater processors face today is managing sewage sludge. More municipalities are turning to improved biogas recovery systems, such as anaerobic digestion, to optimise profitability, generate on-site power and ultimately help the environment. Benefits of anaerobic digestion include odor control, improved soil nutrients and reduction of greenhouse gas emissions. Broader and better mixing options with top-entry agitators solve many of these requirements.


ITT’s top entry agitator product manager, Per Selenius who has a 30-year career with these products, was brought on board two years ago for final rollout of the Flygt top-entry


agitator. He stressed, "As for applications engineering and support and helping the customer in making the right selections and layout of the mixers and the tank, we are second to none there, regardless of mixer type.“


The top-entry agitators come in two blade styles, hydrofoil stainless steel and composite polyurethane – the banana blade used on Flygt low-speed mixers – for optimum performance in different fluids and/or tank types. An advantage of the banana style is high density rag or fibrous material don‘t attach due to the heavily backswept impeller, Selenius said. And the hydrofoil style is particularly effective in high temperature applications above 50-60°C.


The Flygt Top-Entry Agitator is available in three base models. The model 4850 serves many mixing applications and includes banana blade impellers, with an optional bottom support assembly to affix longer shafts to the basin floor. The models 4860 and 4870, which are for digester mixing, include hydrofoil blades, a patented rotating stabiliser that secures the variable- length shaft to the digester bottom, and a patented leveling flange with gas seal that makes it easy to adjust the shaft to true vertical by just one person. These two models also feature a wear-proof water lock to prevent leakage of harmful gases and agitator breakdown. Through its global sales and service network, ITT continues to follow emerging customer needs and constantly improves its offerings to provide new and innovative solutions. With the new top-entry agitators, it owns the broadest product portfolio for mixers available including low-speed mixers, compact mixers and jet mixers.


Reader Reply Card No 92


Process Visualization System Enhanced with Telecontrol for Smaller Installations


The Siemens Industry Automation Division has developed a telecontrol option for its process visualisation system Simatic WinCC V7. Simatic WinCC TeleControl is ideally suited for smaller installations and complements the existing Siemens telecontrol portfolio. In addition to Simatic PCS 7 TeleControl for process automation it also includes PVSS for hierarchical widely distributed system architectures. The Simatic WinCC TeleControl software option uses a WAN (Wide Area Network) to flexibly integrate remote terminal units equipped with Simatic automation components into the installation’s central process visualisation system. Main applications are in the water and wastewater industries as well as oil and gas.


Simatic WinCC TeleControl supports the three main telecontrol protocols IEC 60870-5 101/104, DNP V3 (serial or TCP/IP) and Sinaut ST7 (serial or TCP/IP).


The software can be customised for the requirements of a particular installation. A uniform user interface for local and remote processes minimises the risk of errors. Employee training costs are reduced since the Simatic WinCC process visualisation system is used both for telecontrol operations and for the actual process visualisation. This results in considerably lower installation, start-up and maintenance costs.


Reader Reply Card No 93


Veolia Water to Build and Operate the New Marquette-lez-Lille Wastewater Treatment Plant


The Lille metropolitan area has awarded Veolia Water the contract to reconstruct the Marquette-lez-Lille wastewater treatment plant, the biggest such facility in the north of France. The new treatment plant will be built on the site of the previous one, which is now obsolete. Project design and construction has been awarded to a consortium headed by OTV France Nord, a Veolia Water subsidiary, and comprising NORPAC, DEMATHIEU & BARD, AMODIAG, BONNARD & GARDEL, and ALH (Alain Le Houedec, architect).


Work will begin in mid-October and will last a little over four years. It will generate cumulated revenue of 75 million euros for Veolia


Water. Operation of the plant will start on January 1, 2011. Veolia Water will be the operator under a contract of almost six years that will generate estimated cumulative revenue of 28 million euros. All the civil engineering structures needed to obtain good ecological status of water, which will be required by 2027, will be in place by February 2013, when the new wastewater treatment will become operational. The new sludge treatment process will follow, by 2015 at the latest.


The new plant will have the capacity to treat wastewater from an equivalent population of 620,000, and will have two separate


treatment trains, one for wastewater (2.8 cubic meters per second) and one for stormwater (5.3 cubic meters per second). Proven technical solutions will be used, such as the MULTIFLO®


and ACTIFLO® settling processes, and HYBAS™ biological treatment, which combines


the best of the two technologies: the activated sludge process and the fixed culture process. For sludge treatment, the implementation of EXELYS®


, a new thermal hydrolysis process from OTV, will reduce the quantity of sludge


produced by 20–40% and increase the production of biogas by 15–30% compared to a standard digestion. After being dried and stored, half of the sludge will be used in agriculture and the other half in a cement works.


As the Marquette-lez-Lille plant is in a densely populated urban area, particular care has to be taken in dealing with odours. Veolia Water’s offer includes full control over odour emissions, their treatment and monitoring.


Reader Reply Card No 94


BioSpikes from Novozymes (France) offer a new way to minimise settled sludge volume and reduce solids handling costs in municipal and pulp & paper wastewater lagoons. BioSpikes are made using a unique process that creates a dense spike that rapidly sinks to the bottom of a lagoon, even when applied at the surface of the water. The easy dosing method ensures contact between the beneficial microorganisms and sludge settled on the bottom of a lagoon. This easy application is also useful in problem buildup areas where shortcircuiting is a problem.


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Once BioSpikes reach the bottom of a lagoon, they release billions of microorganisms, powerful enzymes, and essential micronutrients directly into the sludge layer. This combination ensures rapid stimulation of biological activity and reduction of the sludge layer. BioSpikes reduce dredging frequency, increase hydraulic retention time, and improve overall lagoon performance.


“By reducing the sludge volume and increasing the lagoon treatment capacity, plants are able to operate within a larger range of organic loading,” adds Senior Applications Specialist Steve Leach.


Reader Reply Card No 95


Sludge Reduction in Municipal and Pulp & Paper Lagoons


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