Connect with us

Water & Waste Water

Improved ground water protection
Approval for bitumen-based joint system

Published

on


Water & Waste Water
TOK-Sil Resist: Reliable joint design in concrete. (Picture: Denso)
TOK-Sil Resist: Reliable joint design in concrete. (Picture: Denso)

Denso Group Germany achieves optimal sealing against aggressive liquids. TOK-Sil Resist is the first approved bitumen-based sealing system for both concrete and asphalt joints. As a result, the leading company for protective products in sealing technology and civil engineering protects biogas plants and agricultural storage areas against the leakage of hazardous liquids.

For over two years the Deutsches Institut für Bautechnik (German Center for Civil Engineering, DIBt), the Kiwa Polymer Institute, and Denso worked on developing a superior solution also for concrete joints. The approval for asphalt was already given two years ago. Thomas Kaiser, Denso’s Managing Director, is pleased with the results. “Ground water protection is important to all of us. With the extended DIBt approval, we now have a product that protects both concrete and asphalt structures from hazardous substances.”

Until now, available solutions were only approved for either asphalt or concrete, or not traversable. A system solution meeting all requirements did not exist. Application was technically challenging, sometimes close to impossible. Traversable asphalt often meets concrete walls and there a joint sealant for both surfaces is necessary.

TOK-Sil Resist is the solution for this critical contact point of asphalt and concrete and the intersection between vertical and horizontal joints. The traversable system protects all contact surfaces and even the most challenging joint designs – and with that it is unique on today’s market.

Andreas Schrepffer, Manager of BSFT SiloTec GmbH, knows the difficulties ground-wall intersections pose. “There are often problems with these intersections. So far, we used different materials in the wall joints and the ground joints. Bituminous products are commonly used with asphalt. TOK-Sil Resist is a perfect solution because it is also bitumen-based. So now we have just one material to seal off all joints and don’t have to worry about any incompatibilities.”

TOK-Sil Resist is traversable and hardens fast. Only two hours after cooling, joints can be subjected to mechanical pressure and are chemically resistant. The system solution is suitable for construction and maintenance of all types of agricultural storage areas as well as liquid manure, slurry and silage effluent plants.

Construction & Commissioning Water & Waste Water

Wastewater treatment
Czech town welcomes wastewater treatment installation

Published

on

Czech town welcomes wastewater treatment installation

A new wastewater treatment system installed in a town in the Czech Republic will protect valued fishing ponds and raise the quality to required EU environmental standards. Packaged wastewater treatment plant provider WPL installed a below-ground system in Klimkovice, in the country’s Moravian-Silesian region, as part of a municipality-led project to construct a first-time sewerage network to serve 340 of the town’s residents.

Some 110 properties will connect to the new system, replacing ageing septic tanks that had been seeping into streams which flowed into the popular fishing ponds, impacting the quality of the waters, which have protections under the EU’s Water Framework Directive. The project was welcomed by the local community and its successful completion marked with an opening ceremony.

Frantisek Lindovsky, WPL’s manager for central Europe, said: “It was the municipality’s aim to protect the ponds and provide a clean and healthy environment for the fish, which is why the decision was taken to invest in a new sewer network and sewage treatment plant. WPL’s technology was considered the most suitable because our treatment units are modular, compact and ready-to-use.

“The completed system, which will be fed by the town’s new sewer network, will significantly improve the quality of the local streams and fishing ponds and ensure they meet the environmental standards set out by the EU.”

The project team had to overcome significant challenges caused by high groundwater levels, which hindered installation of the treatment tanks.  To manage this, engineers built a temporary well so that water could be continually pumped out and levels kept down throughout construction.

The installed treatment plant – WPL’s Hybrid-SAF biological system – comprises units designed to control chemical oxygen demand (COD), biochemical oxygen demand (BOD) suspended solids, and ammonia. A remote monitoring system was also installed.  The high environmental standards required included 30mg/l BOD, 110mg/l COD, 40mg/l suspended solids and 20mg/l ammonia.

To protect the below-ground units from excess groundwater the excavation was fully backfilled with water-resistant concrete.  A small biological pond was also constructed by a municipality-sourced supplier to provide tertiary treatment and extra capacity was built into the system to cater for population growth. The scheme was financed by the EU Cohesion Fund, which aims to promote sustainable development, and the Ministry of the Environment of the Czech Republic.

The mayor of Klimkovice, Jaroslav Varga, said: “The area’s fishing ponds are used for fish farming as well as leisure, so it was important to protect them.  Installation of the project was executed without any problems and WPL worked with us very proactively. We’re happy they will assist us in the first few months of operation.”

Lindovsky said: “The mayor considered this to be a very successful project because it was on time and within budget and they wanted to celebrate completion with drinks and a speech. As wastewater treatment specialists it is very satisfying to see the pride taken in the new system and the level of appreciation for the environmental benefits it will bring.” The site will be managed by the municipality with WPL providing supervision and support.

Continue Reading

News Water & Waste Water

Water Action Platform
Latest learnings

Published

on

Assessing risk and determining responses to Covid-19 were major themes of the most recent Water Action Platform webinar which took place on 9 July.  Here are six key learnings from the interactive event which was hosted by Isle chairman Piers Clark.

  1. Expect seasonal resurgence of Covid-19
    Recent research shows that we can expect resurgence of Covid-19 due to seasonal fluctuations. In an interview on the Water Action Platform webinar on 9 July, hydrologist Fernando Miralles-Wilhelm, Chair and Professor at University of Maryland said research into the environmental conditions needed for virus outbreaks to “explode” showed the sweetspot for temperature was between 5-11oC and for relative humidity, between 40-70%. He also explained that this information is not yet included in predictive models.Miralles-Wilhelm said, “We do expect resurgence of the virus. It’s a seasonal virus like influenza. As we have very good ways to predict weather and climate we can expect to see a resurgence in November/early December in the northern hemisphere.

    “If we are prepared and take the social distancing measures needed, we can minimise the impact. We have plenty of warning, there is no excuse for not being ready.”

  2. Wastewater detection can give early warning on Covid
    The potential for wastewater to act as an early-warning-system for outbreaks of Covid-19 in communities is being demonstrated by Canadian technology company LuminUltra. Repeatedly testing everyone in a given population for Covid-19 may not be feasible, but identifying and quantifying the presence of SARS-CoV-2 in their collective wastewater can serve as an early warning system, alerting health authorities.Patrick Whalen, chief executive, LuminUltra said, “The science is still evolving but what we know is that people not only infect others directly, but also through air and surfaces. There is potential for wastewater to act as early warning system, to determine the presence of asymptomatic carriers without having to run tests directly on people.”

    Responding to a government callout for technologies for diagnostic testing, LuminUltra contacted Public Health Canada and offered to help shore-up the supply chain for reagents.

    The company has now produced 5 million quantitative polymerase chain reaction (qPCR) tests for Canada and is helping other countries.

  3. Sewage based epidemiology costs quantified
    Participants in the Water Action Platform have been keen to better understand the cost of implementing a sewage-based epidemiological system. A new research paper from a collaboration between engineering consultancy Arup, KWR research institute in the Netherlands and Exeter University in the UK outlines the tasks and costs associated with designing an early-warning system and cites two main cost elements.The first is the initiation phase during which systems are set up, for which the costs are estimated at £200,000. Deployment costs then have to be factored in and for populations of 3-5 million that could run up to £1 million, depending on localised variables.

    Spanish technology company GoAigua has developed a similar pricing model which shows that costs vary depending on size and complexity of the utility and the number of samples, the cost of which ranges from US$30-50 dollars per unit.

  4. Far-UVC light inactivates coronaviruses safely
    Recent research carried out in the US has shown that far-UVC light – wavelengths in the 207-222nm range – efficiently inactivates airborne human coronaviruses. It is well known that conventional germicidal UVC lamps, emitting 254nm wavelengths, can be used to disinfect unoccupied spaces such as empty hospital wards and train carriages, but direct exposure poses a health hazard to humans and cannot be used in occupied spaces.The new study from Columbia University Irving Medical Center found that more than 99.9% of seasonal coronaviruses present in airborne droplets were killed when exposed to a particular wavelength of ultraviolet light that is safe to use around humans. Far-UVC light cannot penetrate the tear film on the surface of the eye or the outermost layer of skin so it cannot damage living cells in the human body.
    Isle chairman Piers Clark said, “At these low dose rates, far-UVC exposure might well provide a method for reducing the virus in public locations. On its own this doesn’t solve the pandemic, but it’s definitely part of the solution.”
  5. Very low risk of virus spreading through sewage
    An ongoing review of the available academic literature by analysts from Isle continues to conclude that the risk of contracting Covid-19 through exposure to sewage is very low. A recent paper on transmission in recreational waters in the journal Science of the Total Environment says that while wastewater is a potential dissemination route for SARS-CoV-2 to recreational waters, there is limited data on the presence and viability of the virus in water bodies.Isle chairman Piers Clark says, “More research is needed, but we hold to our previously stated conclusions that the risk of the virus spreading through sewage is very low.”
  6. Workplace diversity accelerated at innovation sprint
    A collaborative sprint on Improving Workplace Diversity in the Water Industry will take place as part of the Northumbrian Water Innovation Festival. The event, which facilitates sprints and challenges to help solve real-world water issues, will be delivered digitally and internationally for the first time and takes place from 14-17 September.Isle is leading the diversity sprint which will take place 24-hours-a-day, over all four-days of the festival.

    Isle chairman Piers Clark said, “We’re going to look at how we can improve workplace diversity in the water sector and I’m delighted that a much wider group can get involved than ever before, from anywhere around the world. We aim to highlight key issues, gather data and share best practice on a topic which very relevant, especially in light of the Black Lives Matter movement.”

Continue Reading

Measurement, Instrumentation, Control & Automation Plant Construction, Engineering & Components Videos Water & Waste Water

Control Plex Rack
The intelligent all-in-one system

Published

on

E-T-A Elektrotechnische Apparate ControlPlex Rack - the intelligent all-in-one system

Whether in telecommunications, transfer technology or data system engineering, system availability is always a top priority. Control Plex Rack is a complete intelligent system for power distribution and overcurrent protection, combined with control and monitoring technology.

Control Plex Rack supports system uptime by using electronic overcurrent protection. It selectively disconnects loads in the event of a failure and prevents the entire system from shutting down. The Control Plex Rack’s modular design offers our customers a tailor made and very cost efficient system for their applications. The hot-swappable, plug-in design of the components and their plug-and-play capabilities ensures flexible system expansion during operation.

Serviceability and transparency is possible through remote load control and easy integration into existing management systems. Server cabinet space is at a premium. Control Plex Rack can record external sensor data and transmit it to the existing management system. This creates more space in the server cabinet for additional equipment.

Continue Reading