The Solution to Process Engineer's On-Going Problems… …Unique Fluid
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The solution to process engineer’s on-going problems… …unique fluid mixing technology from StemDrive. StemDrive No moving parts! No direct mechanical coupling! No regular maintenance required! Other benefits StemDrive mixer technology • MULTI-FUNCTIONAL – Replaces electric • Easy to install and suited to a wide variety of motor and direct mechanical apparatus. applications, from liquids through powders and granular materials to semi-solids. • UNRESTRICTED MEDIA FLOW – Semi-solid pumping and self cleaning. • Designed to work in arduous conditions and are safe to use, even in hazardous areas. • EASY INSTALLATION / FAST REPLACEMENT – Can be fitted into existing • Environment friendly and can be operated in piping systems. conditions not suited to normal mechanical mixing equipment. • ANY ORIENTATION – Allows flexibility in systems design and installation. • Fully submersible, require practically no maintenance and can run continuously, even in • SUBMERSIBLE AND RESILIENT – Safe in the most rigorous of applications. hazardous areas and tolerant to hostile environments. • EASY OPERATION – Simply fit the unit, supply the power and turn on. • SPECIALS – Can be purpose built in different materials and sizes. The unique StemDrive system! The STEM Drive Fluidic Mixer can be used can be manufactured in various materials and is to mix a wide range of materials. It employs low suitable for use in hazardous environments. pressure air or liquid as the In addition, as the fluidic prime power source and, mixer has no moving parts, without any moving parts, it is environmentally friendly mixes liquids, solids or a and plays a major part in combination i.e. sludges or energy saving. slurries. It is already being successfully In the fluidic mixer, a primary stream of applied within the wastewater industry, potable fluid (the power source) is used to induce linear water along with industrial waste management. and angular motion to a secondary fluid (the Just a few applications for material to be mixed). The motion created in this StemDrive. secondary fluid is imparted by means of an array • Mixing sludge prior to centrifuge of specially designed jets operating in an annulus • Blending lime slurry with sludge within the fluidic mixer. • Mixing sludges to allow tank emptying The primary power stream can be either • Mixing different chemicals to give a air or gas (normally low pressure) or a liquid. As homogenous mix. the primary power fluid is supplied from a remote It should be noted that the tanks source there are no moving parts requiring mixing do not need to in contact with the be emptied to allow the fitting of material being moved, the mixers to take place: a hence the unit is virtually fitment can be fitted to the rim of maintenance free. the tank to allow the mixer to be The fluidic mixer, which is the subject of suspended to any depth. full patents is only available from STEM Drive ltd. Aeration The StemDrive fluidic mixer can also be used for As the unit is mounted as the bottom of the aeration purposes. Its principle of operation is as tank, waterway etc any eves air is then expelled explained in the ‘Mixers’ section. from the end of the mixer, rising upwards aerating the media above. The units can also be built into a liquid line e.g. centrate being returned for further processing, thus aerating before reaching the main plant. For aeration purposes air or gas is used as the prime power source. The action within the unit forces the air into the media being aerated whether liquid or slurry/sludge. StemDrive StemDrive Limited, Solway Works, Eastriggs, Annan, Dumfriesshire DG12 6NJ Tel. +44 (0)1461 40904 • Fax. +44 (0)1461 40801 • Email. [email protected] • Website. www.stemdrive.com Gas mixing There is no need to empty the digester to fit a StemDrive Mixer as it can be connected to the existing gas mixing system mounted through an existing roof top aperture and up and missing with a few hours. The graph below shows the mixing time for a primary digester containing 823m3 of sludge. The StemDrive fluidic mixer can be used in The digester was fitted with a 100mm StemDrive primary digesters using bio-gas as the power mixer and indicates a mixing time of between 30 source. and 45 minutes. Normal turnover time for a The diagram above shows a digester before digester of this volume would be 90 minutes. and after fitting a StemDrive mixer. The mixer re-entrains all grits, solids etc back into the A comparison by Anglian Water sludge giving homogenous mix. As well as mixing at StemDrive unit will increase the production of bio-gas by forcing the bio-gas into the sludge, encouraging further production. StemDrive StemDrive Limited, Solway Works, Eastriggs, Annan, Dumfriesshire DG12 6NJ Tel. +44 (0)1461 40904 • Fax. +44 (0)1461 40801 • Email. [email protected] • Website. www.stemdrive.com Customer problems – solved! Dalmuir Wastewater Treatment Liverpool Waste Water Treatment Works now has no sludge consistency Works save £107,000. problem. A concrete tank some 30mts high by 24mts in diameter was required to the mixed to keep it in a homogenous An innovative new mixing system from StemDrive Ltd has been successfully installed in sludge storage tanks at state and at the same time introduce a given amount of Dalmuir WTW in Scotland. oxygen / hour to keep sludge sweet. The mixers ensure the delivery of sludge of a consistent StemDrive Ltd proposed fitting 8 off100mm nominal nature to the centrifuge plants. bore x 750mm long fluidic mixers mounted on the tank bottom equip-spaced on an 18mts PCD each on a tripod The new Fluidic Mixer employs low pressure air as the type support. The mixers would be supplied by 8 of primer power source and, without any moving parts, can 1inch N.B. feed lines, run down the tank wall then be applied to stirring, transporting, elevating and mixing around the periphery of the tank floor to each mixer. a wide range of fluids and semi-solids. The air source chosen was a Hydrovane 975 Airlogic Compressor. In the Fluidic Mixer a primary stream of fluid (the power sources) is used to induce linear and angular motion to a secondary fluid (the material to be mixed or moved). The motion induced in this secondary fluid is created by an array of specially designed jets operating in an annuls within the Fluidic Mixer. The primary power stream can be either air or gas (normally low pressure) or a liquid, and the material to be moved can be a liquid, solid or a combination e.g. the sludges and slurries of a sewage plant. The primary power fluid is supplied from a remote source (a low- pressure blower) and there are no moving mechanical parts in contact with the material being moved, hence the unit is virtually maintenance free. The patented Fluidic Mixer, which is only available from A study was completed comparing the proposed StemDrive, can be manufactured in various materials and StemDrive solution with the alternative and there was a suitable for use in hazardous environments. In addition, saving of £107,000 with the StemDrive Proposal. the driver is energy efficient and environmentally friendly. The companies concerned decided to go with the StemDrive proposal. The order was placed and material Other waste water and waste uses include mixing of delivered to the site some 7 weeks later, when work sludge tanks into slurry prior to emptying (ensuring ease commenced. Some 10.5 days later the installation was of operation and maximum utilisation of disposal completed. It should be noted the with the StemDrive tankers) and the blending of lime into waste for pH installation there is only 1 moving part in the complete adjustment. solution, that of the Hydrovane Compressor. The Fluidic Mixer can be installed into waste systems without cleaning or emptying of tanks and, So if you require a cost-effective solution through effective and maintenance free mixing, to your mixing problem, contact ensures maximum utilisation of plant with StemDrive for your solution. minimum costs. StemDrive StemDrive Limited, Solway Works, Eastriggs, Annan, Dumfriesshire DG12 6NJ Tel. +44 (0)1461 40904 • Fax. +44 (0)1461 40801 • Email. [email protected] • Website. www.stemdrive.com 1. Problem Reduced time and increased operator safety and efficiency 2. Solution Heavy slurry tank – top crust 3m thick So simple but so effective! 12 hours StemDrive Fluidic Mixer 3. Result Amazing results for so short a time scale. Fantastic results for so little effort. Crust/slurry dissolved to liquid state Quality Awards & accolades We are dedicated to providing a customer service StemDrive named as winner of the Regional Finals of the second to none. And to assist us in achieving this goal, all UNiSYS John Logie Baird Award for Innovation. In a our manufacturing requirements are carried out by H&I ceremony at the Scottish Enterprise Office, Dumfries, Engineering Ltd. StemDrive was presented the award by Laurence McGarry, Chairman, Scottish Innovation. StemDrive was Our quality link is provided by H&I Engineering Ltd, who on of the 16 finalists in the National Finals, with the are accredited to ISO-9001 (2000 revision) and carry award ceremony held at Strathclyde University, Glasgow. out all our manufacturing requirements to this standard. Presenter of the awards to various categories was professor Malcolm Baird, son of John Logie Baird. StemDrive StemDrive Limited, Solway Works, Eastriggs, Annan, Dumfriesshire DG12 6NJ Tel. +44 (0)1461 40904 • Fax. +44 (0)1461 40801 • Email. [email protected] • Website. www.stemdrive.com .