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Converting organic waste material into re-usable energy is an important part of the governments overall strategy for achieving targets for zero food and packaging into landfill by 2015. Anaerobic digestion systems are increasingly playing a key role in this process and P&M Pumps Ltd have provided specialist knowledge and expertise to a number of the UK’s water utility companies. One recent example is an Advanced Digestion project where they were awarded the contract to design and manufacture suitable mixing systems for 4 anaerobic digesters at Dwr Cymru Welsh Water wastewater treatment works located at the Cardiff and Afan. The award of this contract followed many months of design and development by P&M in conjunction with the VAUGHAN Co. the original designers and supplier of the patented ROTAMIX system.

The main objectives:

The main design remit for these mixing systems was to provide optimum active volume mixing within the two sizes of digester proposed. Afan STW digesters required a working volume of 4300m³ with geometry of 17.8m deep x 17.2m Ø; the Cardiff digesters required 6500m³ with geometry of 20.2m deep x 20.2m Ø; while all digesters were to be new build and constructed from concrete.

Hydrolised sludge from the CAMBI process was to be fed into the digesters at a minimum of 10% DSC (Dried Solid Content). The requirements set by Welsh Water and by contractors Imtech Process, was to achieve a homogenous mix of the resulting digestate with an excellent level of active volume mixing. A CFD (Computational Fluid Dynamics) analysis was specifically calculated to develop the design and provided detailed data to all parties showing that the mixing systems offered would achieve this requirement and furthermore, backed this up with a 10 year warranty of all the internal mixing nozzle assemblies. Part of the design solution required by Welsh Water and contractors, Imtech Process, was to have the internal mixing system in a format that would allow the installation and removal of mixing nozzles without the need to empty a digester, stop or interrupt the digestion process nor loose gas during this operation.

A simple yet highly effective system:

The principle of the system is relatively simple with a now patented ‘Drop-In’ Mixing Lance system that has a gas sleeve that seals with the top fluid level, allowing lance assemblies to be inserted and withdrawn without loosing gas pressure. Lances are inserted through the roof of the digester and locate on docking cones permanently installed on the floor of the vessel. These docking cones locate each lance; stopping deflection and ensuring correct alignment for optimum mixing efficiency. Nozzles are strategically placed along the lance to create the VAUGHAN verified dual zone mixing action; lower nozzles create rotation around and across the floor area whilst high level nozzles accelerate upper sludge volume inducing a coriolis effect which drafts high level sludge back down to the central suction points. Sludge is drawn out through the suction point to the VAUGHAN Chopper pumps which are located outside the vessel at ground level. The VAUGHAN Chopper Pumps are at the heart of all or digester mixing systems and each lance is powered by its own chopper pump ensuring that there is always mixing, even when a unit is out for maintenance.

The development of these high performance mixing systems is due to the inclusion of the VAUGHAN Chopper Pump. These robust and reliable pumps condition the sludge as it passes through the impeller cutter area and this reduces solid size as well as preventing reweave agglomeration of fibrous content. The continued conditioning of sludge enhances bio digestion as well as reducing the problems of rag mass down stream in the process.

Drop-in lance enhances process:

Using Drop-In Lance mixing systems has been a significant development in digester mixing technology, these lances allow for easy removal and installation. This facility offers users greater flexibility for future enhancements by adding advance pre-digestion processess such  hydrolisation and pasteurisation as well as increases in dry solids loading, with little disruption to the biological process. The ability to maintain internals without needing to drain and enter the vessel removes the significant cost of disposing of high volumes of sludge.

Once the design of digesters was approved by Imtech Process detailed 3D drawings of the systems were produced to include within their design package. Construction of all 4 digesters (2 at Afan and 2 at Cardiff) were completed by Morgan Est. and Imtech on time, early April 2010 and mixing systems for each were delivered in accordance with the agreed contract dates.

P&M supervised the installation of lances into each digester; the two digesters at Afan were installed in one day and Cardiff within two days from first lift, with an average installation time of only 4 hours per vessel.

P&M designed and supplied a similar system into digesters at Anglian Water Kings Lynn STW, adding credence to designs and methodology. The Kings Lynn digestion has the most productive and efficient digester and this helped convince Welsh Water that pumped mixing was the right solution for these applications. These successes, in addition to the standard designs installed at other advanced digestion schemes at Cotton Valley, Great Billing, and Bran Sands and Frameworks held with Southern Water, has significantly increased the awareness of these systems. This has established P&M and VAUGHAN Co. as important players in digester mixing technology to the Anaerobic Digestion industry, not only in municipal applications but also in the rapid growth area of Bio Waste Industry.

A summary of the benefits:

The features and benefits of System Mix are; retained digester volume and minimal settlement during its working life, maximising solids reduction, continuous recirculation during mixing ensures full distribution and breakdown of solids, both mechanically and biologically, retained gas production is maintained to levels seen at system start without drop-off, minimal cleanout costs as the digester can be easily cleaned at minimal cost. And finally, low installation costs as all rotating equipment is externally mounted and internal equipment is easily installed.

Further information on ROTAMIX systems is available from:

Andy Parr Director P&M Pumps UK.

Tel: +44 (0) 1487 830123
Fax: 01487 832888
Email: sales@pumpmix.co.uk
Website: www.pumpmix.co.uk

Achieving over £37k per year of savings was one of the key benefits appreciated by Anglian Water following the installation of two mixing systems for handling secondary sludge at their Colchester sewage treatment works. In August 2009 P&M Pumps Ltd were commissioned to supply STM (Small Tank Mixing) pumped mixing systems for both secondary sludge tanks at Colchester STW. These tanks measure 30m x 15.2m have a depth of 2.5m and a flat floor with a 1.5% fall. The STM systems replaced four submersible mixers which were constantly failing. Due to this existing poor mixing process continuing problems were evident. For example, the formation of large islands of deposition within the tanks which reduced storage capacity created ever-increasing cleanout costs, but most importantly resulted in inconsistent sludge being fed to the centrifuges. In addition to the poor mixing, maintenance and safety issues had to be addressed each time the submersible mixers needed to be lifted.

Polymer Savings

Each STM system was of bespoke design and consisted of a series of six nozzles in each tank with a Vaughan HE6U chopper pump and motor, auto-self priming tank, associated pipework and valves. To date, Anglian Water Engineers at Colchester STW remain delighted with the performance of the new mixer systems and report that there has been a big reduction in polymer Superfloc C498 usage compared to what was previously required with the submersible mixers.

Sludge feeding the centrifuges used to be very inconsistent (thick & thin) but after a homogenous mix with the new systems the sludge now retains a more consistent character. Taking a closer look at the cost-savings these are the figures calculated cover a time period up to August 2009. In January 2009 the site was using one 750kg bag of polymer per week, at a cost of £1455 per bag. In August 2009 a minimum of 50% was being saved in polymer usage, one bag for every two weeks, with the potential for further savings if optimized for longer resulting in a saving of £37.830 per year minimum. Furthermore, another benefit was a reduction in anti-foam chemical usage to the centrifuges thanks to a fully homogenised and improved quality sludge feed to the centrifuges, providing further savings.

Man Hour Savings

Before the new mixing systems were installed site operatives at Colchester STW would spend approximately one to two hours per day operating a series of valves to control the sludge to the centrifuges. This operation is no longer required, as the systems are fully automated requiring no attention, giving further cost savings and time for the site operatives to carry out other duties on site.

Maintenance

The chopper pumps operating on the mixing systems do require a simple inspection adjustment check every six months, which is a one man operation on site and should take approximately one hour per visit to complete. The mixing systems will have been in operation for two years in January 2011 and the only maintenance costs required to date have been to replace a bearing in one of the drive motors. Colchester STW do not envisage any other costs for at least another two years and this should give a pay-back period, covering the cost to supply and install the mixing systems, of around 2-3 years.

Further information on STM and ROTAMIX systems is available from:

Andy Parr Director P&M PUMPS Ltd UK.

Tel: +44 (0) 1487 830123
Email: sales@pumpmix.co.uk

Website: www.pumpmix.co.uk

With increasing volumes of UK waste now being processed to create biogas from the anaerobic digestion process it is becoming increasingly important to ensure that plant availability and working capacities are maintained. Whilst it is acknowledged that the Biogas industry has benefitted from the technological expertise gained from both the digestion of feed crops such as maize and to some extent from the UK waste water industry, problems are occurring with other types of waste material. For example, the use of household waste material within the anaerobic digestion industry highlights the problems associated with inconsistent waste materials, even when they have been pre-conditioned and blended before entering the digestion process.

Whilst the sludge’s associated with the waste water industry are usually well screened pre-digestion, and energy crops such as maize are uniform before and during the digestion process, it has been proven that heavier, fibrous materials in ‘waste-to-energy’ digestion processes create new problems. In many applications where submersible and paddle type mixers have shown acceptable results where non-accumulating solids are the norm, there are other examples which indicate a direct relationship between poor mixing and gas production.

In addition to the more commonly accepted problems associated with poor mixing (reduced volatile solids reduction caused by less than ideal anaerobic conditions) other factors should also be considered.

These problems directly affect the digester performance in that they either reduce working capacity by settlement or strangle gas release by blanketing the surface of the digester. These problems, combined with solids that are prone to reweave or accumulate in clumps, cause specific problems with unsuitable mechanical plant inside the digester.

Failure to suitably condition simultaneously with mixing also creates problems with concentrated material leaving the digester either via a heat exchanger recirculation system, or onward processing, such as dewatering prior to composting. Premature wear of heat exchanger re-circulation pumps caused by grit deposition is also common where poor mixing at low level is prevalent.

Furthermore, transfer pumps can be prone to clogging and premature wear and unless suitable mixing systems are employed inside a post digestion storage tank it is likely that other problems could be encountered with settlement, dewatering or onward transfer to land.

Whilst numerous types of mixing systems have been developed and implemented for use in anaerobic digestion process systems, many have been subsequently discarded. The VAUGHAN ROTAMIX has become an established and successful digester mixing system, but not only in municipal installations but also in the rapid growth area of Bio Waste Industry.

A recent example is where ROTAMIX tank mixing systems were retrofitted as replacements for submersible and paddle mixers on two digesters at a major waste to energy plant in Bedfordshire during 2010. During the preparation for the retrofit a very significant amount of settled solids were removed from the digester tanks which accounted for over 20% of the available working volume, after only 4 years in operation. The installation of a single externally mounted Vaughan Chopper Pump for each digester and an array of nozzles and pipework were installed quickly and easily.

Since being commissioned gas production has increased significantly and maintained its high level. Post digested sludge condition has shown that the benefits of simultaneous conditioning and mixing create a digestate that is more consistent and more acceptable for use in agriculture.

A summary of the benefits:

The features and benefits of the ROTAMIX system are; retained digester volume and minimal settlement, with over 90% being retained during its working life, maximised solids reduction, continuous recirculation during mixing ensures full distribution and breakdown of solids, both mechanically and biologically, retained gas production is maintained to levels seen at system start without drop-off, minimal cleanout costs as the digester can be easily cleaned at minimal cost. And finally, low installation costs as all rotating equipment is externally mounted and internal equipment is easily installed.

 

Extending operating life and optimising pump performance are among the important benefits behind the introduction of a ‘Health Check Package’, a new initiative from solids pumping and mixing specialists P&M Pumps. The company is offering pre-scheduled site visits incorporating the health check package for existing VAUGHAN chopper pump users in the UK.

Pump operators will acknowledge the importance of conducting routine maintenance in accordance with their in-house policies as well as the recommendations included in the operators manuals supplied by P&M Pumps when the pump(s) were installed. However, the reality in some situations is that pumps are operating 24/7 for extended periods, for several years or maybe even longer, without ANY checking or maintenance. The attached pictures illustrate a ‘before and after’ example. The first picture shows a pump which was extracted and checked having being operated for approximately 5 years with operators commenting that it’s performance was ‘becoming unacceptable’. The second picture shows a similar pump, having been correctly maintained over the same period.

Whilst Vaughan chopper pumps are acknowledged as being extremely durable and well engineered, they include components which need checking and adjusting to ensure optimum performance. However, in some applications and environments if pumps are left unchecked for extended periods this could lead to faults, or in extreme cases catastrophic failure. The result is serious downtime and disruption for operators.

The P&M Pumps Health Check Package is designed to help operators achieve on-going optimum pumping performance with the emphasis on a pro-active, preventative policy, as opposed to a reactive approach, for example ‘if it isn’t broke, why maintain it?’. This approach will also contribute toward the increasing requirement for protecting the capital value of expensive plant and equipment, such as pumps, in addition to their performance as an operational asset.

P&M Pumps offer two types of Health Package which include; site visits by one or two engineers at 6 monthly intervals, or at the customers’ discretion, checking and adjusting of key pump components, re-installing pump for start-up along with a full visit report of individual pumps including all recommendations and proposals.
ENDS.

Further details are available from: Matt Harvey, P&M Pumps,

Tel: +44 (0) 1487 830123
Fax: 01487 832888
Email: sales@thesolidsolution.co.uk
Website: www.pumpmix.co.uk

PROBLEM:

Extreme weather situations in the UK, including severe storm conditions with significant rainfall are an increasing phenomenon and when they do occur usually result in specific challenges for both waste water and industrial effluent treatment operators. A major storm event will trigger a natural flushing mechanism within the mains sewers with the excess foul water carrying larger quantities of rag and debris into the works usually resulting in the main invert system being overridden, choking pumps and flooding tanks, even to the extent of compromising local water courses.

SOLUTION:

Solids pumping and mixing specialists P&M PUMPS identified the potential for a combined mixing, aeration and cleaning system that will also condition and effectively deal with problem solids and rags without causing the blockages that occur with traditional methods. As a result the STORMTHRUST™ system has been developed which can meet the requirements through bespoke tank designs (any size and shape of tank). The system incorporates the unique VAUGHAN Chopper pump which not only conditions the heavy solids but also creates sufficient flows through multiple high velocity venturi nozzles located on the floor of the tank. The result is comprehensive solids suspension and as liquid levels fall the system will direct flow towards the drain end of the tank.

This process removes the majority of debris and settlement ensuring improved tank conditions and cleanliness compared to current systems. The development and application of STORMTHRUST™ is both a natural progression and a great ally to P&M Pumps’ highly rated ROTAMIX and STM tank mixing systems. Following extensive trials P&M Pumps are delighted to report that 21 STORMTHRUST™ systems are currently being installed at two large Thames Water sites.

TO SUMMARISE THE BENEFITS

These established and successful systems, combined with their ever increasing knowledge and experience, makes P&M Pumps confident in their ability to supply an effective solution to any tank conditioning process or application.

The key features and benefits of the Storm Thrust system:

• • Designed for effective storm tank cleaning
  • Simple replacement / retrofit of existing inefficient units
  • Mixes and aerates tank contents if required
  • Chops and conditions all solids present
  • Suitable for any tank size or shape
  • Tank bridges can be removed
  • Lower life cycle costs

Further details are available from: Matt Harvey, P&M Pumps,

Tel: +44 (0) 1487 830123
Fax: 01487 832888
Email: sales@thesolidsolution.co.uk
Website: www.pumpmix.co.uk

The Ford Engine plant in Dagenham is not the type of site you usually associate with an application for a VAUGHAN chopper pump as these powerful, heavy-duty pumps are more likely to be found operating at sewage treatment works around the UK. However, motor manufacturing, like any major process involves its own unique solids pumping challenges. For example, how to handle the difficult combination of swarf, cutting oils and coolants being collected from huge CNC machines operating on engine and transmission manufacture.

The origins of the application began in the late 1990’s when Vaughan Co. supplied an initial trial pump to a Michigan based OEM filter systems manufacturer. The pump was to be tested to see how it would perform against the conventional method of handling waste material and coolant collected from CNC machines. The design and operational characteristics of the Vaughan pump provided an effective, all-in-one combination of shredder and pump which could handle all the ingredients of the machine waste, affectionately known as ‘pump backs’ in the industry.

After 4 years of validation and ongoing collaboration between Vaughan, the filter systems engineers and Ford Motor Company’s transmission and coolant specialists, Vaughan succeeded in being chosen as the preferred type of pump for the waste handling applications.

Fast forward to 2005 and Vaughan’s Huntingdon based UK distributor P&M Pumps became involved with the supply of 74 bespoke design V3M ‘pump back’ pumping systems for similar waste handling applications at Ford’s UK engine plant sites at Dagenham and Port Talbot.

These pumps were supplied from Detroit and then the packaged system was fabricated and built in the UK by P&M Pumps. They were then shipped to the German CNC manufacturer for eventual delivery and installation at the Ford UK sites. Today, approximately 175 Vaughan pumps are, in the words of Ford Motor Company’s engineers, “performing flawlessly” on the waste handling pump applications associated with their huge machine tool process.

Through their experiences at numerous UK waste water treatment and manufacturing sites, P&M Pumps have been able to demonstrate that Vaughan Chopper Pumps are an extremely effective option on the most challenging solids pumping applications.

Further information on Vaughan Chopper Pumps is available from; Matt Harvey,

Tel: +44 (0) 1487 830123
Fax: 01487 832888
Email: sales@thesolidsolution.co.uk
Website: www.pumpmix.co.uk

Effective and reliable pumping of solids in wet wells 24/7, even when ‘rogue’ items present exceptional challenges to heavy-duty submersible pumps, is usually taken for granted, whatever the site or the circumstances. Huntingdon based solids pumping and mixing specialists P&M PUMPS are delighted to have provided an effective solution which has helped the engineers at Peterborough Prison to eliminate the problems arising from blocked pumps.

Opened in 2005, HMP in Peterborough has the distinction of being the first mixed prison in the UK with both male and female wings. P&M‘s Vaughan Chopper pumps were considered for the initial procurement specification during 2004, however the decision was taken (essentially on price) to install another type of submersible pump.

The prison population at Peterborough has increased steadily over several years to around 900+ ‘customers’ and in December in 2011 P&M Pumps were contacted by the engineering services company contracted to maintain pumps, sewers and pipe work systems on the site as frequent problems were occurring as a result of blockages. In fact, the existing pumps were being lifted every week for cleaning and maintenance, where on some occasions suction tankers were called in to maintain the removal of effluent. This of course amounted to significant extra cost and disruption as the pumps could be out-of-action for several days at a time.

P&M Pumps were invited to demonstrate the effectiveness of their Vaughan Chopper pump by bringing their trailer mounted pump set on to site. During the trial, engineers brought items that were regularly causing the existing pumps to block, including gloves, towels and even fleece jackets. The demonstration was a success as the offending items were handled by the chopper pump with impunity.

As a result two VAUGHAN SE4L 7.5kw submersible chopper pumps were purchased and these were adapted to fit straight down onto the existing guide rail mount system in the female wing wet well to ensure an easy retrofit with minimal disruption. Two more similar pumps are now due for installation into the male wing wet well.

Other successes of Vaughan Chopper pumps operating in similar arduous conditions include the maximum security HMP Whitemoor in Cambridgeshire stretching up to HMP Bowhouse, Kilmarnock in Ayrshire with installations also at Wellingboro, Whatton, Stocken, Lexhill and Feltham young offenders’ institution.

Within these numerous UK prison sites P&M Pumps have demonstrated the Vaughan Chopper Pump to be an effective and reliable pumping option for the most challenging solids handling applications requiring vital 24/7 operation.

Further information on Vaughan Chopper Pumps is available from;

Tel: +44 (0) 1487 830123
Fax: 01487 832888
Email: sales@thesolidsolution.co.uk
Website: www.pumpmix.co.uk

The Royal Ballet School in London’s Covent Garden wouldn’t normally be high on anyone’s list of potential effluent treatment pumping applications, but pumping stations need to be kept clean and working, wherever they are situated. In May 2011, Essex based Technical Drain Solutions were looking for a solution to blocking pumps and contacted solids pumping and mixing specialists P&M Pumps.

The problem of blocking pumps was occurring in a central London pumping station which was receiving effluent from a number of sites, including the prestigious Royal Ballet School. Unfortunately, the result of the pumps becoming blocked was the need for unscheduled call-outs whereby Technical Drain Solutions had to clear and clean the pumping station. The combination of poor accessibility in such a congested part of central London along with the high-profile, sensitive nature of the site was proving to be poor practice and a more effective pumping solution was required.

Following discussions between Technical Drain Solutions and P&M Pumps, (UK distributor for Vaughan Chopper Pumps), two pumps were specified to replace the existing pumps. These were a duty and a standby pump from the Vaughan range, model PE4L Vertical Pedestal Mounted options with 7.5kw/4p/415v motors. The pumps have, according to Technical Drain Solutions, operated without any problems and the issues regarding call-outs to deal with blocked pumps have been eliminated.

Furthermore, a testimony to the rugged, durable design and construction of Vaughan chopper pumps, was their performance following a more recent incident. This was when the telemetry / control system ‘tripped-out’ at the pumping station causing the dry-well where the pumps are fitted, to be completely flooded. As a result the pumps and motors (which were not submersible design) became completely submerged. Once the control system was restored and the ‘dry-well’ was pumped out, the Vaughan pumps were powered-up and started without any problems to ensure that the sewage system was operating normally again.</>

Through their experiences at numerous UK waste water treatment sites, P&M Pumps have been able to demonstrate that Vaughan Chopper Pumps can be an effective solution to the most challenging ‘solids pumping’ situations which block other types of chopper pumps. In most cases, retrofitting a Vaughan Chopper Pump into a problematic area improves the whole process and will be self-financing, with payback periods of less than one year, thereafter minimising the effect to the budget holders.

Further information on Vaughan Chopper Pumps is available from;

Tel: +44 (0) 1487 830123
Fax: 01487 832888
Email: sales@thesolidsolution.co.uk
Website: www.pumpmix.co.uk

Maximising the benefits of an anaerobic digestion system by achieving a higher gas yield, reducing foaming and eliminating the potential for maintenance problems, are among the important objectives for all AD plant owners. However, in today’s climate AD operators are now seeking to fully maximise the sustainability benefits of their AD process plant which means each part of the process is coming under even closer scrutiny.

Mixing is a crucial part of the AD process and Huntingdon based SYSTEM MIX LTD who market the Rotamix System incorporating the Vaughan chopper pump, are an established supplier of digester mixing systems at numerous installations across the UK. Andy Parr, Director of System Mix comments, “It is crucial to the AD process that suitable pre-conditioning of solids is carried-out prior to digestion and our system has been proven to be one of the most effective in achieving this”. He continued, “The Vaughan pump prevents re-accumulation of fibrous and fatty material in the digester and this means that material continues to pass through the nozzles. This in turn ensures that digestate is adequately conditioned and actually benefits all post-digestion equipment”. He concluded, “As many AD operators are now looking to maximise the sustainable credentials of their plant and equipment even further, we are confident that the benefits of our mixing systems are becoming even more important”.

Over last few years System Mix Ltd has been involved with ‘retrofit’ projects at existing AD plants where existing mixing systems were contributing to operational and biological issues.

For example, high grit deposition was reducing the active volume of digesters and threatening to significantly reduce output outside compliance requirements. Also, compressors were requiring high levels of maintenance and were proving costly to keep running. Furthermore, as deposition increased, the maintenance issues escalated because not only did the rag mass reweaving within the digester impair their efficiency, it also caused blockage problems in the heat exchangers and further downstream pumps and systems.

For further information on how SYSTEM MIX can help to eliminate the operational and biological issues occurring in AD operations, contact:

Andy Parr, System Mix Ltd, Sawtry, Huntingdon, UK.

Tel: +44 (0) 1487 830123
Fax: 01487 832888
Email: sales@thesolidsolution.co.uk
Website: www.pumpmix.co.uk

PROBLEM:

Many sewage sludge mixing applications utilise submersible, guide-rail type mounted mixers on the basis that they are easy-to-install and remove, thanks to the guide rail system. However, these systems are vulnerable to failure usually due to rag-accumulation on their rotating parts which results in expensive repair or replacement. In many cases the build-up of rag becomes so severe that the lifting davits exceed safe working limits and this can lead to possible safety implications. Furthermore, process throughput and the associated equipment reliability, can also be affected.

SOLUTION:

System Mix Ltd, a division of P&M Pumps, the UK distributor of Vaughan Chopper Pumps and Rotamix Tank Mixing Systems, has established a reputation for developing innovative retrofit in-tank mixing systems. Their versatile approach to sludge mixing has resulted in a number of successful installations across the UK. These include Peacehaven (Southern Water), Howden (Northumbrian Water), Jaywick & Clacton (Anglian Water) and Mogden (Thames Water).

A recent requirement has been to develop a ‘Mini Drop’ retrofit mixing system that can be installed into a tank without having to empty and clean it and also to utilise existing guide rails and lifting equipment, previously used for unsuitable submersible mixers which failed due to rag accumulation. This type of system provides effective mixing for tanks where a suitable suction connection is available for re-circulation through the guide rail mounted vertical nozzle manifold header.

THE BENEFITS:

It is not uncommon for users of submersible mixers where fibrous material causes frequent and expensive breakdowns to have to tolerate the situation because of the cost-implications associated with emptying and cleaning sludge tanks. However, the Mini-Drop system significantly reduces these costs by eliminating the need to empty and clean the tank as it utilises existing guide rail and lifting davit arrangements and in some situations the existing tank openings can also be utilised. The associated Vaughan Chopper Pump required for the system is competitively priced when compared against the frequent submersible mixer repairs and can also be supplied on a hire basis if required.

A SUMMARY OF THE MINI-DROP SYSTEM:

The System Mix Mini-Drop system is in operation at several sites and is proving to be a reliable and cost-effective alternative to submersible mixers where capital projects are unlikely to be allocated. The main features and benefits are; utilisation of the powerful and effective external Vaughan Chopper Pump, tank entry not required to install or remove the system, orientation of the nozzle can be adjusted as required, the pump conditions as it mixes, all submersible parts in 316 stainless steel, quick installation, even into full tanks, full design service available if required.

Further information on the Mini-Drop System is available from:

Andy Parr, System Mix Ltd, Sawtry, Huntingdon, UK.

Tel: +44 (0) 1487 830123
Fax: 01487 832888
Email: sales@thesolidsolution.co.uk
Website: www.pumpmix.co.uk