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Miami-Dade, Florida, has an area where levels of Hydrogen Sulfide Gas are extremely high. When unprotected concrete is exposed to hydrogen sulfide gas, Thiobacillus bacteria can create sulfuric acid that causes severe levels of structural damage from corrosion in a very short time.
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Preventing Sewer Corrosion

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Precasters take biology lessons to increase the life of concrete sewer systems. About 40% of the more than 20,000 wasterwater systems in the United States are concrete. Corrosion severely compromises the structural integrity of these concrete components, costing million sin repairs.
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The Metropolitan St. Louis Sewer District (MSD) faced a problem familiar to many big city wastewater departments managing underground assets. A large (72-inch) sanitary sewer needed to be replaced with an even larger line to handle wet weather flows and eliminate sanitary sewer overflows (SSOs). In the years since initial installation, the above-ground area had become heavily developed. “We’re handling the Coldwater Creek project in three phases,” explains MSD Principal Engineer Greg Tolcou, ...
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Anti-Microbial Additive Helps Concrete Survive in Sewer ProjectWaterWorld - Editorial FeatureThe Metropolitan St. Louis Sewer District (MSD) faced a problem familiar to many big city wastewater departments managing underground assets. A large (72-inch) sanitary sewer needed to be replaced with an even larger line to handle wet weather flows and eliminate sanitary sewer overflows (SSOs). In the years since initial installation, the above-ground area had become heavily developed. “We’re handling...
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The Maline Drop Shaft located near the Chain of Rocks Bridge is just like concrete sewer structures everywhere. They corrode when hydrogen sulfide gas is present. Moderately-high temperatures, long retention times, high biological oxygen demand (BOD) levels, and turbulence contribute to elevated levels of hydrogen sulfide gas which, in turn, provide the food for acid-producing bacteria.
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$60 million project under way using advanced mortar for rehab work. Chicago began the project four years ago and is now rehabilitating thousands of manholes annually. With a population of approximately 2.8 million, Chicago is the third largest city in the United States. The city's masive storm and sewer system includes more than a quarter million manholes and catch basins.
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Casa Grande, Arizona Solves Corrosion in ManholesConShield Technologies, Inc.The city of Casa Grande, Arizona is located in the one of the fastest growing areas of the USA, about midway between Phoenix and Tucson. While new sewer and water lines are being installed rapidly for new developments, older sections still needed work on some badly deteriorated manholes. Manholes deteriorate from a variety of serious problems; but, in the desert southwest, microbiologically induced corrosion is the prim...
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Eight-year test concludes ConShield® treated concrete is superior to Calcium Aluminate cement in severe sulfide conditions. In 1999 the city of Grand Rapids, Michigan, under the direction of Chuck Schroeder, city engineer, embarked on a study to determine the optimal method for preventing concrete corrosion in sanitary manholes due to hydrogen sulfide gas. Turbulence, moderatelyhigh temperatures, and septic sewage create conditions that are ideal for sulfuric acid (H2SO4) production. Sulfuric ac...
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The City of Hampton, Virginia, covers approximately 136 square miles in the Hampton Roads area. With a population of 150,000 people, Hampton is the home of the Langley Air Force Base and Space Center. It also boasts a wide variety of business, industrial, retail and residential areas, historical sites and miles of beaches. The urban waterfront city is becoming a hot spot for tourists on the East Coast.
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In 2000, the manholes near City Hall in Hampton, Virginia, were identified as being severely deteriorated from high levels of hydrogen sulfide gas which fed bacteria to form Microbiologically Induced Corrosion. When unprotected concrete is exposed to Hydrogen Sulfide Gas, bacteria can quickly grow creating sulfuric acid which allows structural damage in just a few short years. This was the case in the City of Hampton. The City of Hampton chose to fix the manhole on Queens Way using a process cal...
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