Spreading the word to the future generation: Water-Energy webinars with the children of Rathnure Primary School, Co. Wexford (Ireland)

Roberta Bellini

Sharing research findings with the wider public is one of the objectives of the Dŵr Uisce project. In particular, engaging youth in activities that are educational but at the same time interactive, fun and stimulating, offers the opportunity to explore environmental issues and to appreciate innovative solutions. Furthermore, using a place-based learning approach in designing learning events, learners can connect the different topics and themes to their locality from an environmental, geographical and historical point of view. Embracing this educational challenge, the Dŵr Uisce Team, in collaboration with Blackstairs Group Water Scheme (GWS), looked at ways of presenting the recently installed pump-as-turbine (PAT) system at an age appropriate level to which the children could relate and link to their own lives and experiences.

 Following installation of an innovative pump-as-turbine energy recovery system at Blackstairs GWS, the Dŵr Uisce team had planned to organise in-school workshops and  site visits to the water treatment plant (WTP) for all three local primary schools served by the scheme: Rathnure National School, Caim National School and Donard National School. However, COVID-19 restrictions intervened. Undeterred, the team, in collaboration with Blackstairs GWS and local teachers, designed and delivered an online experience for primary school pupils. On May 31st 2021, the first three webinars were delivered to children of 4th, 5th and 6th class in Rathnure National School, Co. Wexford (Ireland).

 The webinars explored the water cycle, the water-energy nexus, the history and technical details of the Blackstairs GWS, and the innovative role of the pump-as -turbine system. To compensate for not physically seeing the WTP and for the lack of in-person interaction, each webinar included some fun and engaging activities and visualisation tools to help the children to connect with their locality, reflect on their water use behaviour and its consequences on the current climate crisis.

 Dr. Roberta Bellini, a Trinity-based team member, introduced the webinar ‘THINK WATER = THINK ENERGY’ and the Dŵr Uisce project. Dr. Bellini facilitated a group activity looking at what actions using water the children had carried out in the past 24hrs to immerse the children in the topic. To bridge with the second part of the presentation, the children were guided through the natural water cycle using an enquiry learning approach.

 From here, Ms. Dympna Skelton, Manager at Blackstairs GWS, presented an overview of the history of the Scheme, its geographical layout and its technical details such as pipe network, water treatment process and metering, and of the approach to climate action taken by the Scheme’s board of management. In particular, Ms. Skelton noted the collaboration between Blackstairs GWS and EPS, the WTP operator, to donate the financial savings arising from the Dŵr Uisce energy recovery system to the Wells of Life Ireland charity providing drinking water wells to rural communities in Uganda.

Figure 1: Ms Skelton presenting the Blackstairs Group Water schemes to the children in Rathnure Primary School

Figure 1: Ms Skelton presenting the Blackstairs Group Water schemes to the children in Rathnure Primary School

 To replace the site visit, pictures of the WTP were used throughout. A simple but very effective Google Earth image illustrated the hydrological contribution zone, pipes and other elements of the network in relation to the Rathnure school (Figure 2). When an image of a cartographic map of the network was presented, the children were able to position local places in relation to pipes, tanks and the whole network. The children were tasked to trace the pipes carrying water from the WTP to the schools in the area on a simplified map. Finally, they were encouraged to reflect on the need for energy to perform the different activities they had listed at the start of the webinar through a discussion and a group  activity.

Figure 2: Google Earth project showing the Blackstairs Mountain, some of the BGWS features and Rathnure N. S.

Figure 2: Google Earth project showing the Blackstairs Mountain, some of the BGWS features and Rathnure N. S.

 To illustrate the part played by Blackstairs GWS in climate action, Ms Skelton invited to Dr. Daniele Novara, a Trinity-based Dŵr Uisce team member, to discuss the innovation enabling the carbon footprint reduction of the water treatment operation. Dr. Novara explained the underlying principles and technical details of the PAT-based energy recovery system, using diagrams and a picture of the actual PAT in place in Blackstairs. He concluded with the environmental and monetary saving realised by the scheme, highlighting the positive local and global impacts. The children came to understand how the monetary savings of the first 12 months of operation of the PAT-based system arose and were donated to Wells of Life Ireland. They were proud of the socially-responsible connection between their local community and another in Uganda.

 The children were wonderfully curious as they engaged in the webinar. They asked highly pertinent and detailed questions including the dimensions and costs of the PAT system, the length of time required from ideation to implementation, and the replicability of the scheme elsewhere. They were curious to know if there were other PAT systems in water networks in Ireland and, on learning that Blackstairs GWS currently operates the only one, it sparked in the most entrepreneurial children the idea for a potential tourist attraction!

 Feedback from children and their teachers has been extremely positive: they praised the group activities and the use of maps and aerial views for stimulating learning, critical thinking and creating a link with the local area.

 The Dŵr Uisce Team thoroughly enjoyed the engagement experience and we hope to deliver the webinar in two other local schools in the near future.

Beyond environmental sustainability – Isabel at the SETAC Europe Annual Meeting 2021

Isabel Schestak

How can we make a decision about the most suitable “green” solution of a problem if there are multiple interests at stake, of environmental, social and economic nature? This was one of the hot topics discussed at the SETAC Europe Annual Meeting 2021, which was held online. An example for a method combining environmental and economic objectives is the eco-efficiency assessment.

I presented a poster on my study looking at how the eco-efficiency of water and energy use in a distillery can be improved by recovering heat. Several process streams and the by-products are suitable heat sources which can serve to save up to 25% of heating fuel, as could be shown in a case study on whisky production. However, as additional equipment has to be purchased and installed for heat recovery, it also comes with an environmental footprint and at a financial cost. The eco-efficiency assessment showed that both environmental and economic burdens are by far outweighed through the savings, and that despite requiring most equipment, it can be recommended to recover heat from all possible steps in the whisky making process. The investment costs can be paid back in less than 2 years.

The conference was organised by SETAC, the Society of Environmental Toxicology and Chemistry, and spans a great variety of topics much beyond sustainability assessment, including transport of micro-plastics in the environment, insect decline or anthropogenic stressors in polar regions. Despite being held as a virtual event, there were plenty of opportunities for engagement and networking. The on-demand program was complemented by live discussions to every topic and life keynote presentations. Chat functions under each contribution served as another way of interacting personally with an author.

Our thanks go to Arbikie distillery for the fruitful collaboration enabling the heat recovery study and the funders of the Dwr Uisce project for supporting the participation to the conference.

Heat recovery options in a whisky distillery. Heat can be recovered after mashing (1.), at the two distillations (2.) and from the by-products pot ale and spent lees (3.). This can save up to 25% of heating fuel in the boiler, plus water for the boiler, for cooling or for cleaning. Dotted line: study boundaries.

Heat recovery options in a whisky distillery. Heat can be recovered after mashing (1.), at the two distillations (2.) and from the by-products pot ale and spent lees (3.). This can save up to 25% of heating fuel in the boiler, plus water for the boiler, for cooling or for cleaning. Dotted line: study boundaries.

Minimising the Impact of Heat Recovery on Wastewater Treatment Processes

By Madhu Murali

Our monitoring work at industrial and municipal wastewater treatment plants has found that they have a significant potential for heat recovery. However, there are some concerns regarding the impacts of heat recovery on the efficiency of treatment processes, particularly if a heat exchanger is introduced into the treatment area. To assess these potential impacts, we have replicated a common industrial treatment process, Dissolved Air Flotation, in the lab-scale at Trinity College Dublin. This setup will be used to both determine the scope for heat recovery from Dissolved Air Flotation Tanks and assess any subsequent impacts on their treatment efficiency.

Wastewater temperatures at industrial sites can be very high, particularly in the food and beverage industries where cleaning with high temperature water is often required. Our monitoring work at two meat processing plants showed that their peak wastewater temperatures were as high as 40°C with an average temperature of around 20-30°C. As the wastewater from these plants are treated on-site in treatment facilities, there is an opportunity to recover some of the embedded heat in the wastewater while it is treated. However, the potential negative impacts of heat recovery on the treatment efficiency of wastewater treatment processes should also be analysed to ensure they are minimal. A common treatment processes present in both on-site treatment facilities, Dissolved Air Flotation (DAF), has been selected to conduct a detailed analysis to determine the impacts of heat recovery on its operational efficiency.

Figure 1: A schematic diagram of the lab-scale dissolved air flotation tank

Figure 1: A schematic diagram of the lab-scale dissolved air flotation tank

DAF is a physical treatment process by which suspended pollutants in water can be removed. Small bubbles (or microbubbles) are introduced into the wastewater in a DAF Tank, the bubbles aggregate around suspended particles in the water and lift them to the top of the tank where they can be skimmed off the surface. The microbubbles are formed by compressing air and water in a tank or vessel, called a pressure vessel, to a high enough pressure that the water is saturated with air. When this pressurised air and water mixture is released into the DAF tank through special valves that maintain pressure, the rapid change in pressure from the pressure vessel to atmospheric pressure causes the air to be released in the form of microbubbles. Flow patterns within the tank are controlled by the use of baffles, positioning of the inflow/outflow, and the volume of inflows such that the removal of suspended particles is improved. DAF is commonly used to treat wastewater from the meat processing industry, which have a lot of organic and suspended pollutants in them.

Figure 2: A photo of the lab-scale dissolved air flotation tank with microbubbles seen on the surface

Figure 2: A photo of the lab-scale dissolved air flotation tank with microbubbles seen on the surface

A lab-scale DAF tank (Figures 1 and 2) has been set up at the Hydraulic Laboratory in Trinity College Dublin for experimentation related to heat recovery. The DAF tank is supplied heated water at a maximum temperature of 40°C from a supply tank and a pressure vessel supplies the water/air mixture to create microbubbles. The DAF tank also has two baffles near the inlet to control flow through the tank. Initially, the focus of our work with the lab-scale tank will be in identifying parameters to stably operate it and then characterising flow patterns in the separation zone of the tank to ensure that this is similar to that seen in other DAF tanks.

Future work will focus on identifying optimal locations for heat recovery in the DAF tank by measuring water temperature at different locations and identifying areas with optimal flow patterns. A heat exchanger can then be installed at a selected site to quantify the amount of heat recovery possible in our lab-scale tank. Another line of work will focus on determining any impacts on treatment efficiency in the DAF tank due to heat recovery.

This will involve examining the change in flow patterns and any significant changes in outlet wastewater temperature due to the introduction of the heat exchanger. A proxy suspended pollutant, such as clay, may also be used to determine if heat recovery impacts on its removal by the DAF tank.

Sharing the findings: Insights from the Dŵr Uisce Online Events Portfolio

By Roberta Bellini

The Dŵr Uisce Online Events Portfolio was planned and designed with the aim to share the research findings and project progress with a broad audience of interested participants. The Panelist Discussion on Heat Recovery potential in leisure centres and the Dŵr Uisce Sustainability Webinar Series, a programme of four online events covering the topics of Micro-hydropower, Drain Water Heat Recovery and Benchmarking water and energy efficiency, were featured in the portfolio. The events took place during the period February to April 2021 and have proven very successful.

Dr Aisha Bello-Dambatta, from Bangor University, hosted the Panelist Discussion on February 23rd. The panelists discussed the opportunities and challenges for heat recovery in leisure centres drawing from their professional experience. Twenty four attendees from leisure centres and other SMEs in Ireland and Wales took part in the event and discussion.

The Dŵr Uisce Sustainability Webinar Series was launched back in December 2020 with four events designed to provide the audience with insights and details of our various research areas, including demonstration of practical applications of the technological solution and tools being developed.

On February 24th, Dr Daniele Novara from Trinity College facilitated the first webinar of the series on EXPLORING MICRO-HYDROPOWER. In his presentation he covered the technical details, opportunities and challenges of Pump-As-Turbine (PAT) installations in ‘micro’ and ‘pico’ generation schemes, as well as the specifications of two PAT applications designed and deployed at two demonstration sites, one in Ireland and one in Wales. The webinar attracted over 30 participants from a range of fields, from water-energy companies to research institutes, from small business to public bodies and charities.

March was dedicated to the opportunities and applications of heat recovery from drain water with two webinars on 10th and 24th. In the first webinar, RECOVERING HEAT FROM DRAIN WATER- THE OPPORTUNITY, Dr Murali and Dr Singh, Trinity College Team members, took participants through the background, feasibility and opportunities for recovering the embedded wasted heat in wastewater at domestic, industrial and wastewater collection and treatment levels. The researchers gave an overview of both what they have achieved so far and their future research plans. Participants engaged with the facilitators via the chat asking questions and providing feedback. On March 24th, Isabel Shestak from the Bangor Team and Dr Jan Spriet, previously in the Trinity Team, introduced participants to the technical requirements and potential savings of drain water heat recovery in commercial kitchens. An innovative and user- friendly Heat Recovery Tool for commercial kitchens was launched on this occasion and participants were invited to test it using their own commercial kitchen data or a dataset provided on the day. Very positive feedback was received, with most of the participants saying their results were showing potential savings in costs and greenhouse gas emissions.

The last webinar, BENCHMARKING WATER AND ENERGY EFFICIENCY, was held on April 14th. Dr Annum Rafique, from the Bangor Team, explained what benchmarking is and how it can help businesses and organisations to improve their energy use in relation to water heating requirements. It was followed by the details of a study of benchmarking for the hotel sector and the opportunities for increased efficiency presented by Nathan Walker, Bangor University.

Screenshots form the four webinars of the Sustainability Series

Screenshots form the four webinars of the Sustainability Series

The Dŵr Uisce Team was delighted to welcome over 100 participants to the five events, some of them attending more than one event. Feedback was received from more than a third of the participants; when asked how they would rate the events, 88% of the respondents thought they were ‘Excellent’ or ‘Very Good’. All of the respondents thought the events were either ‘extremely’ or ‘very’ organised.

The audience was a mature audience with some prior knowledge on the topics; nonetheless the webinar contents offered them the opportunity to further their knowledge and understanding. In fact, most of participants said they could use some the information and knowledge learnt from the events. There was a clear appetite for future events, particularly as an opportunity to share the results of long term monitoring at the demonstration sites.

Results of the feedback received from the participants.

Results of the feedback received from the participants.

In terms of growth and consolidation, the Water- Energy Network has expanded from 105 organisations (Nov ’19) to a current total of 141.

Watch this space: the team is now working on further events for the second half of 2021 and into 2022.

Join us on 23 February 2021 at 2pm for a panelist discussion on heat recovery potential of leisure centres

Join us on 23 February 2021 at 2pm for a panelist discussion on

Heat recovery potential of leisure centres: opportunities, challenges, and risks

Description

Climate change poses significant challenges and the global community is not on track to meet sustainable development targets or the Paris Agreement to mitigate climate change. The Covid-19 pandemic and necessary government measures to curb the spread of the virus has put climate action on hold and shut down economies. The need for improved ventilation as an important mitigating factor against the risk of Covid-19 transmission has additional implications for costs and emissions for businesses.   

Leisure centres, as large users of water and energy, are faced with high operational costs and will also be generating significant emissions of greenhouse gases. However, heat recovery technology can yield very significant reductions in water and water-related energy demands and costs without impacting service quality and delivery. These reductions can be a promising response to the current challenges of climate change and post Covid-19 economic recovery.

To discuss energy demands in leisure centres and the important contributions to emissions and cost reductions that can be made through heat recovery, the Dŵr Uisce project (https://www.dwr-uisce.eu/) is hosting an expert panel discussion on heat recovery as one of the several ways these reductions can be made.

The panellists will be discussing a range of questions and some of the current opportunities, challenges, and risks associated with installing heat recovery in leisure centres in order to promote conversation and ideas on how leisure centres can take action that can save costs and improve their environmental footprint in the process.

Objectives

The objectives of the panel discussion are:

  •   To introduce our research on heat recovery in leisure centres to key stakeholders

  • To discuss possible options to these challenges of climate change and post Covid-19 economic recovery

  • To develop partnerships and a network of people working on reducing the operational costs and greenhouse gas emissions associated with leisure centres

Themes: Climate change, climate action, heat recovery, post Covid-19 recovery, sustainability

REGISTER HERE.

Mae'r newid yn yr hinsawdd yn cyflwyno heriau sylweddol ac nid yw’r gymuned fyd-eang ar y trywydd iawn i gyrraedd targedau datblygu cynaliadwy na Chytundeb Paris i liniaru'r newid yn yr hinsawdd. Mae pandemig Covid-19 a mesurau angenrheidiol y llywodraeth i leihau lledaeniad y feirws wedi golygu bod camau i weithredu o blaid yr hinsawdd yn cael eu gohirio a’r economi wedi dioddef yn enbyd. Mae’r angen am well awyru fel ffactor lliniaru pwysig yn erbyn y risg o drosglwyddo Covid-19 yn arwain at oblygiadau ychwanegol o ran costau ac allyriadau ychwanegol i fusnesau.  

Mae canolfannau hamdden, sy’n defnyddio llawer o ddŵr ac ynni, yn gyson yn wynebu costau gweithredu uchel ac maent yn gyfrifol am allyriadau sylweddol o nwyon tŷ gwydr. Fodd bynnag, gall technoleg i adfer gwres arwain at ostyngiadau sylweddol iawn yn y galw am ddŵr ac ynni sy’n gysylltiedig â dŵr, yn ogystal a chostau cysylltiedig heb effeithio ar ansawdd a darpariaeth y gwasanaeth. Gall y gostyngiadau hyn fod yn ymateb addawol i heriau presennol y newid yn yr hinsawdd ac adferiad economaidd ar ôl Covid-19.

I drafod gofynion ynni mewn canolfannau hamdden a’r cyfraniadau pwysig i allyriadau a lleihau costau y gellir eu gwneud drwy adfer gwres, mae prosiect Dŵr Uisce (https://www.dwr-uisce.eu/) yn cynnal trafodaeth banel arbenigol ar adfer gwres fel un o’r ffyrdd niferus y gellir gwneud y gostyngiadau hyn.

Bydd y panelwyr yn trafod amrywiaeth o gwestiynau ac yn rhoi sylw i rai o’r cyfleoedd, yr heriau a’r risgiau presennol sy’n gysylltiedig ag adfer gwres mewn canolfannau hamdden er mwyn hybu sgyrsiau am adnoddau a syniadau ynghylch sut gall canolfannau hamdden arbed costau a gwella eu ôl troed amgylcheddol yn y broses.

Amcanion trafodaeth y panel yw:

  • Cyflwyno ein ymchwil ar adfer gwres mewn canolfannau hamdden i randdeiliaid allweddol

  • I drafod camau posib fel atebion i’r heriau presennol y newid yn yr hinsawdd ac adferiad economaidd ar ôl Covid-19

  • Datblygu partneriaethau a rhwydwaith o randdeiliaid allweddol sy’n gweithio ar leihau allyriadau a chostau gweithredu sy’n gysylltiedig â chanolfannau hamdden

Themâu: Newid yn yr hinsawdd, gweithredu o blaid yr hinsawdd, adfer gwres, adfer ar ôl Covid-19, cynaliadwyedd

COFRESTRWCH YMA.

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Heat recovery potential of leisure centres

Opportunities, challenges, and risks