Sewer systems are large-scale systems that collect and transport stormwater and sanitary sewage out of urban areas. Sewer systems are mainly operated using pumping stations and pollutants are removed from sewage by treatment plants before water is released into the environment. When a sewer overflow occurs, e.g., caused by a strong rainfall, sewage is discharged directly into the environment wi...

The focus of the research presented here is on the automated assessment of sewer pipe conditions using a laserbased sensor. The proposed method involves image and data processing algorithms categorising signals acquired from the internal pipe surface. Fault identification is carried out using a neural network. Experimental results are presented.

A major drawback of separate sewer systems is the occurrence of illicit connections: unintended sewer cross-connections that connect foul water outlets from residential or industrial premises to the storm water system and/or storm water outlets to the foul sewer system. The amount of unwanted storm water in foul sewer systems can be significant, resulting in a number of detrimental effects on t...

Hospital effluents can potentially increase the concentration of emerging pollutants in the influent of wastewater treatment plants (WWTP) and receiving water bodies. This paper presents a hydraulic model that predicts the transport of selected pharmaceuticals and personal care products (PPCP) in a municipal sewer system section of Oslo, Norway. The sewer section additionally collects sewage fr...

This paper addresses the problem of navigation of an autonomous robot when it moves in a modern concrete sewer. The robot must keep its orientation within mostly cylindrical sewer pipes. This implies a geometrical constraint on the environment in which the robot operates. We present a hybrid vision system that consists of (a) an optical camera and (b) a laser crosshair projector generating a cr...

Abstract Operation, maintenance and rehabilitation of sewer networks are mainly driven by the results of CCTV inspections. With the European EN 13508 code, a standard classification scheme has been issued. The inspection results of course are suitable for prioritizing the most urgent measures within the network, because of leaks exfiltrating fowl water to the aquifer or collapses causing instab...

Concrete corrosion is one of the most significant problems affecting valuable sewer infrastructure on a global scale. This problem occurs in the aerobic zone of the sewer, where a layer of surface corrosion develops on the exposed concrete and the surface pH is typically lowered from around 11-10 (pristine concrete) to pH 2-4. Acidophilic microorganisms become established as biofilms within the...

Biochemical reactions that occur in sewer pipes produce a considerable amount of hydrogen sulfide gas (H2S corrosive and poisonous), methane gas (CH4 explosive and a major climate change contributor), carbon dioxide (CO2 a major climate change contributor), and other volatile substances (collectively known as in-sewer gases). These toxic gases lead to contamination of natural environment, sewer...

In a distribbted environment, a client program bound to a sewer fails when the Sewer changes (possibly due to the sewer being relocated, replicated or rewnfigured). In this paper, we describe the design of an object-replacement scheme in a client-sewer environment. Our design addresses the problem of replacing a sewer and transparently updating the client handle so that no sewice interruption i...

We discuss how Delft-FEWS is applied to incorporate real-time sensor data and dynamic modeling to allow Real Time Control (RTC) of three sewer systems in the area of the Hoeksche Waard, the Netherlands. The purpose of this project was to reduce sewerage spilling to the surface water by optimizing the available storage in the sewer systems. In this paper we will present how Delft-FEWS makes use ...