sewer corrosion Articles
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Release of hydrogen sulfide under intermittent flow conditions – the potential of simulation models
For engineering purposes it is especially useful to be able to predict and control sewer corrosion rates and odor impacts as well as to design effective measures aiming to reduce effects related to hydrogen sulfide formation and release. Doing so, it is important to use modeling tools that are capable of assessing variations of dissolved oxygen, dissolved sulfide and hydrogen sulfide gas ...
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SCORe-CT: a new method for testing effectiveness of sulfide-control chemicals used in sewer systems
A new method for testing the effectiveness of chemical products for sulfide control in sewers is reported. The method, called SCORe-CT (Sewer Corrosion and Odour Research – Chemical Testing), consists of two specially designed laboratory-scale systems that mimic sulfide production in real rising main sewers, and a multi-phase and multi-facet testing protocol. The monitoring tools/methods include ...
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Hydrogen sulfide gas emission under turbulent conditions – an experimental approach for free-fall drops
Odor nuisance and sulfide corrosion in sewers carrying septic wastewater are accelerated at points of turbulence such as drops in manholes, but accurate methods or empirical expressions to evaluate the gas stripping rate at those particular sites are still missing. With the aim of improving the current knowledge on the influence of free-fall drops on the release of hydrogen sulfide gas, an ...
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ABS-181 Hydrogen Peroxide Enhancer
Introduction The conventional sewer cleaning system can only bandaging the problems which cannot provide solution to prevent sewer line corrosion caused by toxic gases, organic constriction, deprived penetrating distance, generated large amount of hazardous organic and inorganic waste to increase environmental burden. The Objectives of the present invention is an aggressor method providing ...
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Impact of water source management practices in residential areas on sewer networks – a review
Prolonged drought which has occurred everywhere around the world has caused water shortages, leading many countries to consider more sustainable practices, which are called source management practices (SMPs) to ensure water availability for the future. SMPs include the practices of water use reduction, potable water substitution and wastewater volume reduction such as water demand management, ...
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Comparison of core sampling and visual inspection for assessment of concrete sewer pipe condition
Sewer systems are costly to construct and even more costly to replace, requiring proper asset management. Sewer asset management relies to a large extent on available information. In sewer systems where pipe corrosion is the dominant failure mechanism, visual inspection by closed circuit television (CCTV) and core sampling are among the methods mostly applied to assess sewer pipe condition. ...
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A sewer ventilation model applying conservation of momentum
The work presented herein was completed in an effort to characterize the forces influencing ventilation in gravity sewers and to develop a mathematical model, based on conservation of momentum, capable of accounting for friction at the headspace/pipe interface, drag at the air/water interface, and buoyancy caused by air density differences between a sewer headspace and ambient. Experiments were ...
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Controlling chemical dosing for sulfide mitigation in sewer networks using a hybrid automata control strategy
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, ...
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How drought conditions and low flow sustainability improvements lead to increased odour and corrosion risks in sewer networks
Water conservation plays a major role in the performance and goals of water utilities and the communities they serve. Reduced consumption results in less demand on water resources, which are either consistently shrinking or have larger variability than previous years that put constraints on consistent delivery. An often-forgotten new challenge that results from conservation is a reduction in ...
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City of Memphis Wastewater Treatment Plant - Case Study
The T.E. Maxon Wastewater Treatment Plant of the City of Memphis, TN has four, 180-foot diameter primary clarifiers. Clarifiers 1, 2 and 3 were built in 1980 with 54-inch diameter concrete inlet pipes. Looking forward, engineers designed the splitter box that distributes effluent to the clairfiers, to allow a fourth clairfier, which was added in 1996 with a 48-inch diameter concrete inlet. After ...
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Saline sewage treatment and source separation of urine for more sustainable urban water management
While energy consumption and its associated carbon emission should be minimized in wastewater treatment, it has a much lower priority than human and environmental health, which are both closely related to efficient water quality management. So conservation of surface water quality and quantity are more important for sustainable development than green house gas (GHG) emissions per se. In this ...
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Mitigating operational risks by harnessing the power of digital technology
About the contributor: Sam is a process engineer with over 20 years of water industry experience in both the public and private sectors. His experience spans from process design, project delivery, commissioning, operations and maintenance through to water and sewer networks as well as membrane systems in desalination and recycled water schemes. Sam brought his extensive water operational ...
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Global sensitivity analysis of an in-sewer process model for the study of sulfide-induced corrosion of concrete
The presence of high concentrations of hydrogen sulfide in the sewer system can result in corrosion of the concrete sewer pipes. The formation and fate of hydrogen sulfide in the sewer system is governed by a complex system of biological, chemical and physical processes. Therefore, mechanistic models have been developed to describe the underlying processes. In this work, global sensitivity ...
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10 Reasons Why You Need A Sewer Camera
This article explains the reasons why you should add a sewer camera to your list of business equipment including the benefits it will provide to you as well as your clients. Are you providing sewer repairs and similar solutions to clients in your business? If so, then it’s important to make sure that you are investing in the right technology and equipment. One of the best examples of this ...
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No more odor and corrosion case study
Sewer systems are vulnerable to corrosion and, at times, can be the source of unpleasant odors. Kemira’s new H2S-Guard tackles both problems, as in most cases the source of these issues is hydrogen sulphide, forming in septic areas, in other words areas where no oxygen for metabolic reactions is available. The H2S-solution combines three important steps: measurement, monitoring and control ...
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A dynamic ventilation model for gravity sewer networks
To implement any effective odour and corrosion control technology in the sewer network, it is imperative that the airflow through gravity sewer airspaces be quantified. This paper presents a full dynamic airflow model for gravity sewer systems. The model, which is developed using the finite element method, is a compressible air transport model. The model has been applied to the North Head ...
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Wastewater Level Measurement Techniques
Level monitoring and control is a fundamental requirement in any wastewater treatment process. You will find level instrumentation installed at even the simplest treatment plants for pump control, chemical storage tanks and process level controls or alarms. Operators have only limited or emergency control over treatment plant influent, so level controls and instrumentation play an important role ...
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Sacramento State – upgrading sewer to “green”
Tidelands Construction Company installed a new Flowtite Septic Tank on the campus of California State University in Sacramento. This upgraded sewer system was part of a school-wide “green” building initiative. The governing body at one of California’s finest universities began a large-scale “green building” project designed to reduce the school’s harmful ...
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Microbiology: The Key to Wastewater treatment case study
The biological treatment of wastewater relies mainly on a consortium of heterotrophic and autotrophic bacteria. The fecal bacteria that are constantly introduced into the collection system are not the optimal bacteria for degrading the contaminants present in wastewaters. The soil bacteria that are introduced through inflow and infiltration are more effective at degrading the wastes and can ...
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Sewer Collection System Bioaugmentation Reduces Influent Load and Improves Plant Performance
Abstract The effectiveness of In-Pipe Technology (IPT) patented sewer collection system engineered bioaugmentation on i) influent wastewater loads to wastewater treatment plant (WWTP), ii) WWTP performance, and iii) effluent quality, was a demonstrated at a domestic sequencing batch reactor (SBR) WWTP (Sewer District #20) in Suffolk County, Long Island, New York in collaboration with the Suffolk ...
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