Clean waterways with artificial intelligence and IoT
Natural water systems carry a high value. They support a diverse ecosystem for flora and fauna; they keep people healthy by preventing water-borne diseases; and they protect and create tourism and recreation opportunities.
However, in cities all over the world – and particularly in older cities – stormwater runoff and household sewage are transported to water treatment plants in the same piping network. An advantage of these so-called combined sewage systems (CSS) is that runoff water, which could be polluted with oil, pesticides, fertilizer, and more, is purified before it is released into nature. That’s good news for the environment.
There is a downside, however: During heavy rainfall or snowmelt, a CSS piping network can be stretched to the limits and untreated water may escape into waterways via the combined sewer outlet (CSO). But the chances of this happening are greatly diminished when blockages in the CSO are removed in time. Siemens, Yorkshire Water, and the University of Sheffield have joined forces to develop a system that employs artificial intelligence (AI) and the Internet of Things (IoT) to locate blockages before overspills can occur.
Cut pollution incidents by 50 percent
The British water company Yorkshire Water operates 55,000 km of sewers. In times of intense rainfall, CSOs are designed to release excess water and sewage into rivers to prevent flooding in public areas. Of course, these incidents need to be kept to an absolute minimum. In the framework of Yorkshire Water’s Pollution Incident Reduction Plan 2020-2025, the goal is to cut pollution incidents by 50 percent. Key to attaining this objective is to remove CSO blockages and thereby minimize the probability of a release.
For some time now, around 2,000 sensors on CSOs have been monitoring sewage levels and issuing alerts when an overspill has happened. But wouldn’t it be better to know where blockages are most likely to occur so that debris can be removed before an overspill has a chance of developing? Until now, experts at Yorkshire Water have been trying to make predictions by evaluating data from the sensors with statistical methods, but that often led to false alarms and late detections.
The data has allowed us to identify problems with our network quickly, giving our teams the opportunity to attend to them before pollution occurs.Heather Sheffield, manager of operational planning and technology at Yorkshire Water
The analytical challenge is how to account for the personal character of every CSO. Each one responds differently to rainfall, so it is difficult to know if the observed changes in level are normal or not. A number of factors come to play here: such as the design of the upstream and downstream network, or whether the area is hilly or flat, urban or rural.
Therefore, the utility took the bold step of replacing statistical methods with AI and IoT – an approach that has now been tested at 70 sites across the region. “The results of the innovative trial across the region have been very positive. The data has allowed us to identify problems with our network quickly, giving our teams the opportunity to attend to them before pollution occurs,” says Heather Sheffield, manager of operational planning and technology at Yorkshire Water.
Cloud-based data analytics with AI and IoT
The data from the sensors on the CSOs along with real-time information on rainfall is delivered to SIWA Blockage Predictor. This application – which runs on MindSphere, the leading industrial IoT as a service solution – identifies anomalies in sewer system behavior.
Initially, an AI system was trained with sensor data to learn the normal behavior for a CSO when it rains. Now, a new AI model has been trained for each site to learn its unique pattern of behavior in response to rainfall. Fuzzy logic technology is then employed to automatically interpret the data to detect any significant differences in behavior. When an issue is found, a response team at Yorkshire Water receives a notification to visit the asset and remove the blockage or forming blockage. Because SIWA Blockage Predictor is embedded within a web application, users can access it on mobile devices and PCs.
“Artificial intelligence is not magic. It requires experts in data science to come together with people who really understand the issue and engineers who can build software, connect hardware, and knit together a solution that is secure against cyberattack. This project is a textbook example of how all strands should come together,” says Adam Cartwright, head of IoT application delivery at Siemens.
Artificial intelligence is not magic. This project is a textbook example of how all strands should come together.Adam Cartwright, head of IoT application delivery at Siemens
Greater effectiveness in several ways
In the trial involving a variety of assets across 70 sites, SIWA Blockage Predictor gave up to two weeks’ advance notice of blockages – blockages that could have potentially led to undiluted effluent being released into the environment. What’s more, the predictor found nine in ten potential issues, which makes it three times more successful than the prediction processes that relied on statistical methods. Another boon to operations teams is an extremely low false alarm rate of just 3 percent. That’s half the rate of the current statistics-method-based approach.
Co-creation: a team effort
A challenge of building any new digital solution is the chance that it might be something customers don’t want or need. For that reason, involving clients in a co-creation process leads to better outcomes. Yorkshire Water was engaged in this project from the start. To ensure they had the necessary commitment to progress at pace, a co-creation order contributed toward development costs and the team committed to bi-weekly reviews and deploying the application in parallel to their current system. After a “go” decision in January 2020, the first minimal viable product (MVP) was introduced in March. The global release of the application in the MindSphere store came in November 2020.
The journey from idea to product began with a series of research projects between Yorkshire Water and the University of Sheffield. Over a number of years the core analytics concept was proven on a sample of Yorkshire Water assets.
“By building a personalized fingerprint for the wastewater assets that reflects how the local network responds to rainfall and overlaying that on patterns of daily behavior, we have been able to establish what each asset’s "normal" response is,” says Joby Boxall, professor of water infrastructure engineering at the University of Sheffield.
While the analytics worked, as an academic project it was not designed to be scalable nor secure, and it wasn’t optimized for easy daily use. When Siemens joined the project team, the data science knowledge was transferred and the university team took on a second important role – validating the effectiveness of how Siemens had developed the analytics and how this compared to the existing Yorkshire Water solution. After analyzing 21,300 days of data, this independent analysis by the university further boosted Yorkshire Water’s confidence in this new tool.
By building a personalized fingerprint for the wastewater assets, we have been able to establish what each asset’s "normal" response is.Joby Boxall, professor of water infrastructure engineering at the University of Sheffield
Ready for a market launch
Siemens and Yorkshire Water are now working out the details for SIWA Blockage Predictor to cover the rest of the utility’s CSOs. Beyond that, the solution is being piloted at two other UK water companies, including a solution for new sites that don’t already have a level sensor installed. Here, Siemens low-powered radar sensor Sitrans LR110 can be integrated into a remote terminal unit ready connected to MindSphere and SIWA Blockage Predictor. This unique offer that shows how a smart digital solution can add value to Siemens’ hardware portfolio.
Considering the absolutely positive impact for protecting the environment, SIWA Blockage Predictor is also garnering attention in markets outside the UK. Combined sewage systems are not exclusive to the UK, and the desire to preserve natural water bodies is universal. When AI and IoT are sensibly combined, they can make a big contribution to keeping the environment clean.
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