This document provides technical recommendations that both systems and primacy agencies can use to comply with Lead and Copper Rule (LCR) corrosion control treatment requirements and to evaluate and designate optimal corrosion control treatment (OCCT) more effectively. The appendices include OCCT evaluation templates that can be used to organize data and document decision-making. For added customizability and convenience, these templates are also availabile in a spreadsheet format.
![]()
The update addresses common technical questions and clarifies that the recommendations are provided as generalized guidelines. Specific values identified in the recommendations are not intended to be interpreted or prescribed universally as default minimums or maximums. Individual system characteristics (e.g., water quality, distribution system configuration, lead and copper sources, etc.) may warrant other alternatives or values that are distinct from the manual.
Design Manual for Odor and Corrosion Control in Sanitary Sewerage Systems and Treatment Plants, EPA/625/1-851018, October 1985. On July 28 through July 30, 2008, the U.S. Environmental Protection Agency (EPA) Region 8, EPA Headquarters, the State ofMontana, and PG Environmental, LLC, subcontractor to Eastern Research. Environmental Protection Agency (EPA) strives to provide accurate, com- plete, and useful information. However, neither EPA nor any person contributing to the preparation of this document makes any warranty, expressed or implied, with respect to the usefulness or effectiveness of any information, method, or process disclosed in this.
![]()
The 1985 EPA design manual Odor and Corrosion Control in Sanitary Sewerage Svstems and Treatment Plants states, 'Many. Water Pollution Control Federation, 1977. SYSTEM DESIGN Elm Road Dairy is. The farm constructed a digester to control odor and improve manure management. PATTERSON FARMS – AUBURN, NY FARM-SCALE DAIRY.
Wastewater systems have long been subject odor and corrosion. Descargar Drivers Sonido Para Windows Xp Gratis. The wastewater odor is the driving force behind implementing controls for these systems. Corrosion, however, has the greatest potential for environmental, systemic and economic harm. This damage can be in the form of burst pipes and other equipment failures.
Failures of this type require equipment repair and replacement, and they have the potential to expose the environment to releases of hazardous waste that may be difficult, if not impossible, to contain or recover. Corrosion caused by H 2S A major contributor to odor and corrosion in industrial systems is hydrogen sulfide (H 2S) and its associated compounds. Some industrial wastewater contains sulfur compounds, which provide the molecular basis for the generation of H 2S. H 2S arises from the combination of anaerobic conditions and the presence of sulfites and sulfates with the slime layer – colonies of microorganisms present on the inner walls of all collection systems.
Sulfate reducing bacteria (SRB) will use these compounds in the absence of free oxygen (O 2) for metabolism. They do not use the sulfur component, and it is available to react with water, specifically free protons (H +), resulting in the generation of H 2S. Following its generation, H 2S can be released into the atmosphere and find its way to receptors through junctions of the atmosphere and collection system, at which point it is an odor concern.
H 2S is a colorless gas that has a characteristic rotten egg odor, is highly toxic and is corrosive to certain metals. It is heavier than air, meaning it can accumulate in wells, manholes and other similar locations with little ventilation. Its effects on humans, at varying concentrations relative to ambient air, are shown in Table 1. Sulfuric acid is also a byproduct of anaerobic SRB – one of the primary causes of corrosion in collections systems. H2S health effects at different concentrations H 2S becomes a corrosion issue when it contacts moist concrete or steel, among other metals, in the presence of oxygen, even at very low gaseous concentrations. Conditions such as these are common in the headspace of some pipes and other areas where the collection system has easy access to atmospheric oxygen. SRB in these areas convert the H 2S into sulfuric acid, which then begins a destructive reaction with the infrastructure.
Historically, control of odor and corrosion has been implemented through either vapor phase techniques, where the headspace of a system is treated, or liquid phase techniques, where treatments target the liquid flow. Vapor phase treatments like scrubbers do not provide corrosion control. Some of the liquid phase techniques offer corrosion control. The most common method of inducing liquid phase treatment, or directly treating the wastewater inside the collection system, has been by dosing chemicals into the system. A constant and continuous dose of chemical is fed from a large reservoir with a small pump into the collection system, typically at a manhole or pump station.
![]() Comments are closed.
|
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |