Browsing USN Open Archive by Author "Ratnaweera, Harsha"
Now showing items 1-7 of 7
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Analysing consequences of infiltration and inflow water (I/I-water) using cost-benefit analyses
Sola, Kristin Jenssen; Bjerkholt, Jarle Tommy; Lindholm, Oddvar G.; Ratnaweera, Harsha (Peer reviewed; Journal article, 2020)The Municipality of Asker (Norway) is at risk of not meeting the water quality targets set by the European Union Water Framework Directive within the stipulated timeframe. While there are multiple factors negatively impacting ... -
Economic Model Predictive Control for optimal struvite recovery
Nair, Abhilash Muralidharan; Haugen, Finn; Ratnaweera, Harsha (Peer reviewed; Journal article, 2020)Resource recovery from municipal wastewater has been a prime focus for a decade. Although several recovery processes already exist in the market today, the high cost of material, inherent disturbance in the influent quality, ... -
Identifying factors influencing infiltration and inflow (I/I-water) in wastewater systems using multivariate data analysis
Sola, Kristin Jenssen; Kvaal, Knut; Bjerkholt, Jarle Tommy; Lindholm, Oddvar G.; Ratnaweera, Harsha (Peer reviewed; Journal article, 2019)The share of infiltration and inflow water (I/I-water) in the wastewater network is influenced by several factors. The purpose of this study is to propose a method to investigate the relationship between different variables ... -
Implementing an Extended Kalman Filter for estimating nutrient composition in a sequential batch MBBR pilot plant
Nair, Abhilash Muralidharan; Fanta, Abaynesh Belay; Haugen, Finn; Ratnaweera, Harsha (Journal article; Peer reviewed, 2019)Online monitoring of water quality parameters can provide better control over various operations in wastewater treatment plants. However, a lack of physical online sensors, the high price of the available online water-quality ... -
Implementing an extended kalmanfilter for estimatingnutrient composition in a sequential batch MBBR pilot plant
Nair, Abhilash Muralidharan; Fanta, Abaynesh Belay; Haugen, Finn; Ratnaweera, Harsha (Journal article; Peer reviewed, 2019)Online monitoring of water quality parameters can provide better control over various operations in wastewater treatment plants. However, a lack of physical online sensors, the high price of the available online water-quality ... -
Real-time monitoring of enhanced biological phosphorus removal in a multistage EBPR-MBBR using a soft-sensor for phosphates
Nair, Abhilash Muralidharan; Gonzalez Silva, Blanca Magdalena; Haugen, Finn; Ratnaweera, Harsha; Østerhus, Stein Wold (Peer reviewed; Journal article, 2020)Enhanced biological phosphorus removal (EBPR) from municipal wastewater has been achieved in a multistage Moving Bed Biofilm Reactor (MBBR) configuration. The process operations can be further optimized by real-time ... -
What effect does rehabilitation of wastewater pipelines have on the share of infiltration and inflow water (I/I-water)?
Sola, Kristin Jenssen; Bjerkholt, Jarle Tommy; Lindholm, Oddvar G.; Ratnaweera, Harsha (Peer reviewed; Journal article, 2021)Infiltration and inflow water (I/I-water) is a big challenge in sewage systems in many countries. I/I-water above an acceptable level indicates that the sewage system is not functioning properly. I/I-water leads to increased ...