An output-feedback control strategy for pollution mitigation in combined sewer networks is presented. The proposed strategy provides means to apply model-based predictive control to large-scale sewer networks, in-spite of the lack of measurements at most of the network sewers. In previous works, the authors presented a hybrid linear control-oriented model for sewer networks together with the fo...

mechanical, hydraulic, and chemical washing methods are the most common methods for sewer line cleaning. each of these methods includes several sub methods. rodding and bucket machine are the two most important of mechanical cleaning methods, whereas high-speed and flushing are the most important hydraulic cleaning methods. acids, alkalis, surfactants, and enzymes are widely used materials in s...

Late research and developments show a trend towards integrated models to simulate the urban drainage cycle to offer a complete picture of the system’s performance. However, in regard to integrated models considering water quality, only few actual case studies exist. We developed such a model for the urban drainage system of Graz, Austria containing runoff generation, a sewer system, actuators a...

Nutrient pollution and associated eutrophication of freshwaters threaten the ecological integrity and the services provided to humans by lakes. We examined how human residential development influenced the level of lake eutrophication in the Seattle, WA, USA, region. We surveyed 30 lakes and measured 3 indicators of eutrophication: concentrations of chlorophyll-a and phosphorus, and the proporti...

In this paper we address the problem of automatic measurement of the shape of sewer pipes. We describe a method for recovering the interior shape of a sewer pipe from a video sequence that is acquired by a fish-eye lens camera moving inside the pipe. The method is based on solving the general structure-from-motion problem by tracking interest points across successive video frames. Here the inte...

A study for assessing the sources and fate of pollutants during their transport within urban catchment was carried out in the central Paris district, "Le Marais". 16 polycyclic aromatic hydrocarbons were assessed, according to the EPA list, in different types of runoff from a town centre and wet weather waste waters at the outlet of the catchment. PAHs were found predominantly in particulate ph...

The principal sources and pathways of pharmaceutical and personal product (PPCP) compounds within an urban drainage system are identified with combined sewer discharges from households and infiltration from landfill/land sludge applications constituting major routeways. Illicit connections, sewer exfiltration and reclaimed domestic wastewaters comprise potentially significant other contaminant ...

An output-feedback control strategy for pollution mitigation in combined sewer networks is presented. The proposed strategy provides means to apply model-based predictive control to large-scale sewer networks, in-spite of the lack of measurements at most of the network sewers. In previous works, the authors presented a hybrid linear control-oriented model for sewer networks together with the fo...

A 514 I f it weren't for the cement pipe segments nearly nine feet in diameter, oversize yellow backhoes, towering piles of sand, and yawning trenches scattering the streets, the section of Toronto near the junction of Connaught and Fargo avenues would look like an ordinary residential neighborhood. In spring 2011 this area of comfortable-looking contemporary houses surrounded by tidy landscapi...

OBJECTIVES This study compared the prevalence of Leptospira interrogans and hepatitis A virus (HAV) antibodies in serum samples from sewer workers and controls. METHODS A blood sample was obtained from 76 of the 101 municipal sewer workers (75%) of Quebec City and from two controls matched to each for age and sex. Testing was done for antibodies against serovars of Leptospira icterohaemorragi...