Chemicals such as magnesium hydroxide (Mg(OH)2) and iron salts are widely used to control sulfide-induced corrosion in sewer networks composed of interconnected sewer pipe lines and pumping stations. Chemical dosing control is usually non-automatic and based on experience, thus often resulting in sewage reaching the discharge point receiving inadequate or even no chemical dosing. Moreover, inte...

DESCRIPTION As the infrastructure in the United States ages, increasing importance is being placed on rehabilitating the nation's wastewater treatment collection systems. Cracks, settling, tree root intrusion, and other disturbances that develop over time deteriorate pipe lines and other conveyance structures that comprise wastewater collection systems. These deteriorating conditions can increa...

This paper presents a new and alternative method (in the context of urban drainage) for probabilistic hydrodynamical analysis of drainage systems in general and especially prediction of combined sewer overflow. Using a probabilistic shell it is possible to implement both input and parameter uncertainties on an application of the commercial urban drainage model MOUSE combined with the probabilis...

In this paper a multijoint robot f o r sewer inspection tasks i s presented. In order t o increase the operating scope the robot has been made able t o run round or over obstacles, to follow sewage branches and is aimed t o work wirelessly unlike mos t other sewer inspection robots. A s a result of the wireless approach the robot has to carry an energy resource and mus t be able to act autonomo...

Many older cities have “combined” sewer systems that collect both sewage and stormwater runoff in the same pipe for transport to a wastewater treatment plant. During heavy rainfalls, these combined systems can become overloaded, and water utilities must discharge the excess— what’s known as a combined sewer overflow (CSO)—into rivers and other water bodies, which may be the local source of drin...

Under the city of Barcelona, which has a population of three millions of habitants in an area of 98 Km, there is a complex sewage system with almost 1500 Km of length. That system is characterized for being unitary, that is, its collectors carry rain water and residual water. The yearly rainfall is not very high (600 mm/year), but it includes heavy storms typical of the Mediterranean climate th...

We present an overview of a project that aimed to develop and implement computer vision techniques capable of extracting quantitative, three-dimensional descriptions of the shape of the surveyed pipe from sequences of images captured by an uncalibrated camera moving along a small-bore urban sewer. The resulting techniques are capable of use both on-line, during actual sewer surveys, and offline...