The city council of Martins Ferry, Ohio passed an ordinance authorizing the Director of Service/Safety, John Davies, to advertise for bids and enter into a contract for demolition and installation of the ozone generators and dryers and all related equipment and supplies.
As can be seen from other posts on this site, the use of ozone for municipal water treatment continues to grow with more and more cities around the country adding this technology to their mix.
An algae bloom in the Cape Fear River caused the 22,500 Brunswick County, NC residents to have serious taste and odor problems with their water. The taste and odor problem may be a result of treating water at the Northwest Treatment Plant with chlorine dioxide. The chlorine dioxide and dying algae may create a chemical reaction which produces the taste and odor that people are experiencing.
Though the Cape Fear Public Utility Authority pulls its water from the same source, residents on that side of the river didn’t experience the same taste and odor problems. This is because Cape Fear Public Utility treats its water with ozone instead of chlorine dioxide.
New Hanover had experienced the same problem as Brunswick County is now. When the department was looking to expand its treatment plant at that time, officials decided to spend a little more money and go with the ozone system. Since then, they’ve had no trouble with odor or taste.
Brunswick County is now looking at ozone, along with other options to prevent future taste and odor occurrences. Taste and odor control is an important application for ozone in the treatment of drinking water.
Winnipeg is adding a state-of-the-art plant that will employ four new drinking water treatment processes once it’s on-line next year. Odor-causing algae will be clumped together by coagulants, forced to the surface with tiny air bubbles (DAF) and then skimmed off into settling ponds. Ozone will break down organic molecules into smaller, more easily destroyed chains. Biofiltration using carbon filters will remove the remaining organic molecules. These processes will be added to two existing measures – ultraviolet radiation treatment to inactivate the cryptosporidium and chlorination to kill single-celled animals like giardia.
This approach of multiple barriers is gaining strength among water treatment regulators and operators as the threat of both water born desease and the byproducts of chlorine disinfection are balanced.
Industrial odor control is an emerging application for ozone. We recently came across a news item describing work done at NC State and the U of Georgia regarding the use of ozone and catalysts for the destruction of odor causing VOC in the poultry industry. Dr. Praveen Kolar, of NC State, is the lead investigator.
Rendering facilities take animal byproducts (e.g., skin, bones, feathers) and process them into useful products such as fertilizer. These rendering processes produces foul odors. While not currently regulated these odor create problems with the communities where the rendering facility is located.
Chemical scrubbers can reduce the impact of these odors, but have limited impact on some of the compounds such as aldehydes. Kolar, working with his co-author Dr. James Kastner at the University of Georgia, have designed an effective process that uses catalytic oxidation to remove these odor-causing pollutants. The process uses ozone and specially-designed catalysts to break down the odor-causing compounds. This process takes place at room temperature, so there are no energy costs, and results in only two byproducts: carbon dioxide and pure water.
Dr. Kolar’s next goal is to apply this research to industrial hog farms and to develop the technology to a larger scale. Dr Kolar’s work was published in the following journal. ROOM?TEMPERATURE OXIDATION OF PROPANAL USING CATALYSTS SYNTHESIZED BY ELECTROCHEMICAL DEPOSITION, P. Kolar, J. R. Kastner, Transactions of the ASABE, Vol. 52(4): 1337-1344, 2009 American Society of Agricultural and Biological Engineers ISSN 0001-2351