Development of a DynaJet Cavitation System for High-Rate Disinfection of Combined Sewer OverflowsEPA Contract Number: 68D03066
Title: Development of a DynaJet Cavitation System for High-Rate Disinfection of Combined Sewer Overflows
Investigators: Kalumuck, Kenneth M.
Current Investigators: Chahine, Georges L.
Small Business: Dynaflow Inc.
EPA Contact: Manager, SBIR Program
Project Period: October 1, 2003 through December 31, 2004
Project Amount: $225,000
RFA: Small Business Innovation Research (SBIR) - Phase II (2003) Recipients Lists
Research Category: Small Business Innovation Research (SBIR) , Water and Watersheds , SBIR - Water and Wastewater
Dynaflow, Inc., proposes to continue the development of a novel hydrodynamic cavitation process for high-rate disinfection of combined sewer overflows (CSOs) based on the DynaJets® cavitation jet technology. This process does not produce the potentially hazardous byproducts of chlorination and ozonation and can operate in the presence of suspended solids. The first 6 months of the Phase I research project demonstrated the feasibility of using this technology for destruction of the bacteria Escherichia coli and Bacillus subtilis in controlled laboratory conditions, as well as the ability to maintain cavitation and destroy bacteria in the presence of particulates.
This Phase II research project, as well as the remaining months of the Phase I research project, will investigate the ability to destroy other microorganisms, including cryptosporidium and giardia. A parametric and optimization study will be conducted, and scaling laws will be derived for the design of different capacity systems. These laws will be refined based on different laboratory-scale DynaJet® units and one prototype-scale unit. Practical issues of location, implementation, and operational requirements will be addressed. A technology prototype will be designed, fabricated, and tested to provide data that will refine the scaling laws and enhance the commercialization efforts. The technology prototype will be designed for transportation to, and operation in, an actual combined sewer system for field evaluation.
Successful completion of this Phase II research project will produce a new state-of-the-art technology for disinfection of CSOs that will be implemented in high-rate, high- efficiency, and cost-effective systems. This technology will find immediate application in the estimated 900 U.S. communities with a total population of 40 million that currently have combined sewer systems. Consideration of potential international users creates an even larger market. The ability to achieve disinfection, together with organic contaminant oxidation without the potential hazards of chlorine byproducts, storage, and transportation, will render this technology very attractive not only for CSOs, but for a much broader class of water disinfection and remediation applications. These include disinfection of pharmaceutical, biotechnology, and hospital wastes, as well as removal of microorganisms from ship ballast water to prevent the spread of nonindigenous invasive species. Another potential application is the removal of organic contaminants and disinfection of drinking water. There is a growing need for such technology throughout the world as the demand for potable water increases and the available supply decreases. The technology appears to be robust and able to be implemented at multiple scales so that it could be utilized for both large central systems and smaller local systems.