Automation of Delivery Device for Chlorine Dioxide Disinfection
MetadataShow full item record
Series/Report no.:2009 Edward F. Hayes Graduate Research Forum. 23rd
Although water reuse has been practiced in many countries for centuries, severe water scarcity in many parts of the world has aroused renewed interest. In addition, the health risks posed by untreated wastewater emphasize the need to prevent the spread of fecal-oral pathogens through adequately disinfecting wastewater. Though chlorine has widely been used as a disinfectant, its inability to inactivate certain microorganisms and its role in the formation of cancerous trihalomethanes has created the search for alternatives. Chlorine-dioxide has been found to be an effective replacement, though it poses some inherent safety issues being explosive at concentrations of 10% (w/w) or more, sensitive to pressure, and somewhat toxic to juvenile fish. Small packets of precursor chemicals are now commercially available to generate small quantities of chlorine dioxide onsite. The aim of this research was to develop an automated delivery device for dispensing this disinfectant in the form of a packet, which would strongly mitigate safety issues and make the dispenser user-friendly. The automation of the delivery device involved the design of a 30-slot Geneva mechanism to drop the packet into a chamber. This packet-dropping mechanism was designed for use both in a manual mode, requiring no use of electricity, and an automated mode, powered through electricity. A fully functional prototype was built to demonstrate the automation of a disinfection delivery device. Disinfected water is safe for discharge on open lawns and gardens, since the chlorite ion, a byproduct, is present in low concentrations. However, wastewater discharge and reuse may be subject to local or state regulations.
Poster: 1st Place (The Ohio State University Edward F. Hayes Graduate Research Forum)