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Article

What Effect Does Rehabilitation of Wastewater Pipelines Have on the Share of Infiltration and Inflow Water (I/I-Water)?

1
Faculty of Mathematical Sciences and Technology, Norwegian University of Life Sciences, 1430 Ås, Norway
2
The Municipality of Asker, 1372 Asker, Norway
3
Faculty of Technology, Natural Sciences and Maritime Sciences, University of South-Eastern Norway, 3603 Kongsberg, Norway
*
Author to whom correspondence should be addressed.
Academic Editor: Caetano C. Dorea
Water 2021, 13(14), 1934; https://doi.org/10.3390/w13141934
Received: 26 May 2021 / Revised: 6 July 2021 / Accepted: 10 July 2021 / Published: 13 July 2021
(This article belongs to the Special Issue Water Quality Monitoring and Modeling Research)
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 pumping costs and increased sewage overflow, leading to increased pollution of the receiving waters. Many rehabilitation projects are driven by the need to reduce the share of I/I-water and common measures are to replace pipes and manholes. The share of I/I-water is predominantly driven by rainfall. This makes it difficult to document the efficiency of mitigating measures. One way to address this issue is to compare data from rehabilitation areas to areas where no measures have been implemented. Three rehabilitation areas in Asker Municipality, Norway, were successfully assessed by applying this approach. Asker has a 100% separate system. The strategy to reduce I/I-water in Asker Municipality was to rehabilitate sewage mains, either by full replacement or lining the old pipes, and replacement of manholes. The assessment shows that rehabilitation of selected municipal pipes, pipes proven to be in bad condition through closed circuit TV inspection, reduced the share of I/I-water only to a limited extent. Since the rehabilitation done was not a complete replacement of all pipes and manholes, the limited effects are assumed to be caused by the water finding other ways into the system. In separate systems other measures than renovations of pipes should be considered when aiming to reduce I/I-water. View Full-Text
Keywords: infiltration and inflow water (I/I-water) measures; measurements; wastewater infiltration and inflow water (I/I-water) measures; measurements; wastewater
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MDPI and ACS Style

Sola, K.J.; Bjerkholt, J.T.; Lindholm, O.G.; Ratnaweera, H. What Effect Does Rehabilitation of Wastewater Pipelines Have on the Share of Infiltration and Inflow Water (I/I-Water)? Water 2021, 13, 1934. https://doi.org/10.3390/w13141934

AMA Style

Sola KJ, Bjerkholt JT, Lindholm OG, Ratnaweera H. What Effect Does Rehabilitation of Wastewater Pipelines Have on the Share of Infiltration and Inflow Water (I/I-Water)? Water. 2021; 13(14):1934. https://doi.org/10.3390/w13141934

Chicago/Turabian Style

Sola, Kristin J., Jarle T. Bjerkholt, Oddvar G. Lindholm, and Harsha Ratnaweera. 2021. "What Effect Does Rehabilitation of Wastewater Pipelines Have on the Share of Infiltration and Inflow Water (I/I-Water)?" Water 13, no. 14: 1934. https://doi.org/10.3390/w13141934

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