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Wastewater Chlorination Systems : A Holistic Approach Toward Design and Construction
| Content Provider | Semantic Scholar |
|---|---|
| Copyright Year | 2019 |
| Abstract | T he Miami-Dade County Water and Sewer Department (WASD) currently operates three wastewater treatment plants that serve one of the largest metropolitan areas in the United States. On any given day, WASD provides water and wastewater service to nearly 2.3 million residents and thousands of visitors throughout the county. The largest facility at WASD is the Central District Wastewater Treatment Plant (CDWWTP), which was constructed in 1956. Currently, CDWWTP is a secondary treatment facility consisting of headworks, high-purity oxygen activated sludge biological treatment facilities (oxygen-generating system, oxygen train tanks, final clarifiers, and return activated sludge [RAS] pumps), and disinfection. Miami-Dade County entered into a consent decree with the U. S. Environmental Protection Agency (EPA), which has mandated improvements to a variety of processes throughout WASD’s wastewater infrastructure. Among WASD’s assets identified for improvements were the chlorine gas disinfection facilities at CDWWTP and it elected to replace the existing chlorine gas disinfection system with a liquid sodium hypochlorite (NaOCl), or bleach, system that is safer to handle than gas or liquid chlorine and will improve overall plant health and safety. The NaOCl will be transported by delivery trucks to CDWWTP, where it will be stored in a main bulk storage building. Metering pumps at the main facility will serve as part of the NaOCl feed system for various injection points throughout the plant. The NaOCl storage system will also include a second ancillary site for additional storage. The CDWWTP chlorination project provides an example of the design and construction challenges of transforming an existing chlorine gas disinfection system to a NaOCl dosing system. The design and construction process was a collaborative effort among the design team, construction team, and WASD staff. Design challenges included providing a functional design layout of the NaOCl storage and feed system, which considers adequate storage and accommodates system maintenance. The building layout and yard piping were some of the most important design elements of the project. During construction, equipment testing and integration of the process control equipment and instrumentation were some of the greatest challenges. The CDWWTP chlorination project will provide the design teams with a holistic approach toward designing chlorination disinfection facilities and an overview of the project. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://fwrj.com/techarticles/0819%20tech3.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
