{"id":4918,"date":"2024-10-14T07:42:00","date_gmt":"2024-10-14T12:42:00","guid":{"rendered":"https:\/\/www.oxidationtech.com\/blog\/?p=4918"},"modified":"2024-10-18T10:33:25","modified_gmt":"2024-10-18T15:33:25","slug":"using-ozone-to-reduce-h2s-in-lift-stations","status":"publish","type":"post","link":"https:\/\/www.oxidationtech.com\/blog\/using-ozone-to-reduce-h2s-in-lift-stations\/","title":{"rendered":"Using ozone to reduce H2S in lift stations"},"content":{"rendered":"\n

Original news article HERE<\/a><\/p>\n\n\n\n

Technology that feeds oxygen and ozone into force mains and lift stations cuts odor and corrosion for Tennessee utility.<\/strong><\/p>\n\n\n\n

Brandon Ambrose and his maintenance team have enough to do maintaining 230 miles of gravity sewers, 19 miles of force main and 31 pump stations. The last thing they need to deal with is odor complaints.<\/p>\n\n\n\n

\"\"<\/a><\/figure>\n\n\n\n

And yet, over the years, the team in Mount Juliet, Tennessee, fought a long battle against hydrogen sulfide odor from wastewater in force mains. They controlled the odor with chemicals, but Ambrose, waste-water supervisor, wanted a more cost-effective and sustainable way to deal with H2S.<\/p>\n\n\n\n

He found it in a technology that generates pure oxygen and ozone and injects it into the wastewater at pump stations. First used in a successful pilot test at one pump station, the unit has been deployed permanently at four stations, and three more will be added this year. It has reduced H2S levels at pumping discharge points from spikes of more than 400 ppm to less than 10 ppm. Payback on the equipment from chemical savings ranges from 1 1\/2 to three years.<\/p>\n\n\n\n

High-volume pumping<\/strong><\/p>\n\n\n\n

Mount Juliet has no wastewater treatment plant, instead sending an average of 3.5 mgd to Metro Water Services in Nashville, about 30 miles east. In-house team members handle the vast majority of collections system and pump station maintenance, including pump rebuilds, seal replacements, pipelaying and electrical work. They also service about 3,000 Myers 2 hp residential grinder pumps (Pentair).<\/p>\n\n\n\n

The city\u2019s population has roughly tripled in the past 10 years to 38,000, mainly with residents who commute to jobs in Nashville. The collections system is expanding rapidly to keep up with the growth. \u201cWe send a lot of water through force mains, some of them up to 15,000 feet long,\u201d says Ambrose, who holds a Collection Systems 2 operator\u2019s license. \u201cAnytime you keep sewage in a line for a long time, that\u2019s a bad thing.\u201d<\/p>\n\n\n\n

H2S odor issues became so severe at some pump stations that a calcium nitrate solution was being dosed at 70 to 100 gpd. The chemical is effective, and the team still uses it as needed, mainly at the city\u2019s smaller pump stations.<\/p>\n\n\n\n

Through an industry contact, he learned about the<\/p>\n\n\n\n

oxygen and ozone injection system <\/a>. In 2010, the company deployed a trailer-based demonstration unit to test the technology at the city\u2019s Nonaville Road lift station, discharge point for a 7,900-foot-long, 10-inch force main with an average flow of 175,000 gpd.<\/p>\n\n\n\n

After tapping the line to inject the oxygen and ozone, Ambrose and his team, with help from Anue Water Technologies technical service representatives, made adjustments to optimize the feed rates. Once that was accomplished, average H2S levels at the discharge point dropped from 80-120 ppm to 20-30 ppm within three days, based on ozone feed at 20 grams per hour and oxygen feed at 60 liters per minute. An independent engineering firm verified the test results.<\/p>\n\n\n\n

\"ozone<\/a><\/figure>\n\n\n\n

Making it permanent<\/strong><\/p>\n\n\n\n

Satisfied with the outcome, Ambrose decided on a permanent installation at the Royal Oaks lift station, which sends 250,000 gpd to the Nonaville Road site. The installation was completed in 2013 through remodeling of an existing building on the site.<\/p>\n\n\n\n

The FORSe 5 system is designed for force mains up to 10 miles long with pressures to 200 psi and flows up to 30 mgd. Its main components include:<\/p>\n\n\n\n