Willsbridge Mill on the edge of Bristol is popular with dog walkers and historians alike. Constructed in 1792 and surrounded by the natural beauty of Willsbridge Valley, it attracts tourists from far and wide. Set in an isolated area far from the mains drains however, dealing with wastewater poses a challenge. When the old packaged pumping station at the site failed, Willsbridge Mill turned to Rotamec, who installed a green, cost-effective treatment system that removed the need for a pump altogether.
As an older listed building, Willsbridge Mill is not directly connected to mains drains. Usually, wastewater from a building directly enters the mains drains where it flows to pumping stations and onto treatment facilities. However, the mill was relying on a packaged pumping station buried underground. As wastewater entered a chamber, the system intermittently pumped the sewage 80 metres uphill so it could enter the mains drain outlet. When the pump failed, it was clear that a radical new alternative was required.
Located in a chamber underground, carrying out continued maintenance on the pump was time consuming and costly due to repetitive blockages. This sometimes resulted in unpleasant smells, which at a tourist hot spot like Willsbridge Mill, is not ideal. Furthermore, the substantial cost of having to empty the chamber of wastewater on a regular basis was becoming unsustainable for facility managers. To solve the issue, the local council approached Rotamec, a leading electromechanical service provider to the engineering sector, to propose a new treatment system.
Paul Pearce, Sales Director at Rotamec, carried out a site inspection to determine the best course of action: “The old pumping station consisted of a single-phase 230 volt powered submersible pump. The downside with these installations is not only reliability issues, but the energy consumption to pump the wastewater to the drains. These maintenance and operational issues translate to greatly increased costs – before we even consider emptying the tank regularly when the pump fails.
“A new system was needed. After assessing the visitor numbers at the site and its geography, I was convinced that a sewage treatment plant that harnessed the anaerobic digestive process would be an optimal solution.”
The system Paul proposed to the council removed the need for a pump altogether. Instead, sewage flows into an underground tank, where digestion by bacteria occurs. A low voltage air blower inside the tank circulates air around the clock to promote the growth of this bacteria and neutralise harmful substances in the sewage. Once digestion is completed after a period of weeks, the now treated water is then gravity fed back into the water table.
Powerful type 8139 radar level measurement
Those facing challenges in measuring fluid levels in hygienic applications should be aware of Bürkert’s new Type 8139 non-contact radar measuring device. Designed to provide highly accurate, continuous measurement for specialised tanks that contain difficult to measure fluids, the Type 8139 is optimised to meet the needs of the pharmaceutical, food and beverage and water industries.
Radar level measurement relies on a signal being emitted, reflected by the medium and then received by the device’s antenna. Differences between the emitted and received signal are then rationalised via sensors to provide a level reading.
For hygienic applications, this provides the advantage of non-contact level measurement, all important in minimising contamination. As a result, the Type 8139 is suitable for bioreactors, ultra-pure water storage tanks, clean agent storage, beer and raw milk tanks, as well as containers for liquid foodstuffs, water treatment tanks, mixing and equalisation ponds, intake channels and flocculant storage tanks.
What differentiates the Type 8139 from competitive solutions is how it applies its radar signals. Delivering a radar frequency at 80 GHz with a dynamic range of 120 dB ensures continuous radar measurement of the medium. Higher frequency translates to short radar wavelengths, improving the accuracy of received signals. As a result, the Type 8139 delivers a measuring accuracy of +/- 1 mm, regardless of temperature or pressure in the tank.
The medium itself can pose difficulties to traditional radar level measurement devices – but not the Type 8139. Media with poor reflective properties (a low dielectric level) can flummox devices with a low dynamic range. However, the 120 dB range of the Type 8139 radar signal is able to detect even the smallest of reflections, ensuring accurate measurement of substances with a low dielectric constant.
This is also of great value when measuring through foam, an issue inherent to beer tanks for example. A higher dynamic range means less radar signal attenuation is caused, ensuring results are still accurate.
Another challenge that the Type 8139 overcomes is the interference by equipment installed in the tank, such as heating coils and agitators. The 80 GHz frequency allows the device to focus emitted radar signals within a tighter cone, therefore delivering greater accuracy from received signals, as the tight beam avoids installed equipment that may otherwise interfere.
A narrower radar beam means more signal returns to the sensor. The high frequency also ensures that the Type 8139 can emit and receive signals through glass, steam and condensate. This is an advantage for hygienic end users utilising small, narrow or high tanks.
The Type 8139 is inherently compact, however its powerful signal enables a measuring range of up to 30 metres. The device offers an IP67 ingress rating as standard and a 4-20 mA output. Furthermore, it can withstand temperatures up to 150°C, which makes it ideal for steam in place (SIP) processes encountered in hygienic applications.
Options include a plastic horn antenna, threads with integrated antenna and flanges with encapsulated antennas to suit different mounting applications. The device is maintenance free, offers easy installation as well as the exceptional chemical resistance properties that are expected of all hygienic equipment.
Joining forces for a better future
To create a bigger impact on the fight for clean water we have partnered up with BRAC, a global leading NGO that reaches 120 million people around the world, creating opportunities and making a difference.
We are committed to delivering solutions that strengthen the reliability and sustainability of the water supply in the developing world. By joining hands with BRAC, we are taking effort to honor this commitment. BRAC is a Bangladesh based enterprise committed to working with communities to solve their problems by eradicating poverty and creating social enterprise while focusing on overall development including water and sanitation.
BRAC is working in eleven countries and reaches 120 million people, aiding the most marginalized people in extremely poor, conflict-prone, and post-disaster settings. Partnerships such as this is a necessary step in combatting the world’s water crisis as it enables our products and solutions to be put to work, where the need is dire, and they can make a great impact.
– If we want to make a real difference, we need partnerships. By teaming up with BRAC we can accelerate our efforts to deliver clean water to millions of people in need, and at the same time transform our business towards an even greater positive impact, says Mads Nipper, Group President and CEO.
Sharing the same values is what empowers this partnership to make great opportunities for taking the world’s water crisis head on and create ripples into communities in need around the world.
– BRAC is delighted to have signed a partnership agreement with Grundfos. We feel very much aligned with their work, values and products and are truly excited about the potential for the partnership to have huge impact through the delivery of safe water to millions of people living in poverty. I’m very much looking forward to seeing the partnership grow and flourish, says Lewis Temple, CEO, BRAC UK.
One of the key initiatives in our partnership is the WASH services. BRAC has been working on breaking the cycle of contamination due to bad hygiene and sanitation for nearly 85 million people in Bangladesh, who lack access to basic sanitation facilities. With our new and innovative technologies to remove contaminants from water, such as arsenic, salt, iron and other heavy contaminants we can help combat the water challenges while working together to advocate the case for universal access to clean water and SDG 6.
– With this partnership we set out to create opportunities, not only for the people who need access to safe water, we also get to demonstrate the benefits of our pioneering approach, gain valuable insights and mark ourselves as an innovative leader in delivering sustainable services, says Peter Trillingsgaard, Group Vice President, Group Communication & Public Affairs.
Drive solutions for sewage plants – We keep our slate clean
In the field of water treatment, the drive technology is decisive for the availability and efficiency of pumping and fan stations. NORD DRIVESYSTEMS offers branch-optimised solutions that are characterised by great operational reliability, long service life and high axial and radial load capacities.
Completely unobstructed operation is just as essential as high efficiency in sewage plants. For drive units which operate continuously, energy costs are a very important factor. In addition to the operation of aeration systems, it is mainly the pumps which are the significant factors for electricity consumption in sewage treatment plants. NORD DRIVESYSTEMS combines energy-efficient motor technology and almost loss-free gear unitsas well as frequency inverters with energy-saving functions for its drive solutions, ensuring top reliability and economic efficiency. Additionally, the service and maintenance friendly drive units by NORD reduce down times and thereby increase the efficiency and plant availability.
Even with the extreme environmental conditions, like moisture, dust and dirt, to which the drive units for waste water treatment and outdoor applications are often exposed to, drive technology by NORD is perfectly prepared. Double covers, IP66 brakes, increased corrosion protection through multiple coat painting, overload protection, stainless steel shafts and reinforced output shaft extensions are only a few examples for the high level of protection that is offered by NORD units.
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