In January 2010, AdEdge Water Technologies LLC was contacted by Aqua Utilities Florida to provide a hydrogen sulfide removal system for the Lake Josephine Community, located in Highlands County, Fla. The existing water system consisted of two wells feeding into a centralized distribution system with a maximum capacity of 230 gal per minute (gpm) being consumed by a population of 1,250 people. The raw water well water contains high levels of hydrogen sulfide which produces objectionable odors in the customers’ tap. The treatment goal for the Lake Josephine system is to reduce the levels of hydrogen sulfide to the non-detectable odor threshold of less than 0.05 mg/L.
The Treatment Solution
The AdEdge treatment system features a skid-mounted AD26 oxidation and filtration package unit sized for a maximum design flow of 230 gpm. The model APU26-4260CS-3-AVH utilizes AD26 media in a three-vessel carbon steel configuration in parallel. The system is equipped with automated control valves and harness, central control panel with programmable logic controller (PLC) and a color user interface screen. System features also include differential pressure switches, control panel and local gauges, flow sensors and totalizers, and a central hydraulic panel with sample ports for a complete functioning packaged unit. Each 42-in.-diameter treatment vessel contains 30 cu ft of AD26 oxidation/filtration media. The AD26 is an NSF-61 certified manganese dioxide media used for the treatment of arsenic, iron, manganese and hydrogen sulfides.
The hydrogen sulfide removal system fully integrates with the existing chlorine chemical feed system to oxidize the sulfide ion to elemental sulfur, which precipitates out of solution and is then filtered through the media. In addition to the hydrogen sulfide treatment system, AdEdge is providing an H2Zero backwash recycle system. The backwash recycle system reclaims 100% of the backwash wastewater and removes the captured suspended solids as a semi-solid sludge that can be disposed of in a non-hazardous landfill. The InGenius PLC initiates backwashing of the treatment system, which occurs two or three times a week depending on the water usage.
The system was started in November 2011. Since then, the hydrogen sulfide concentration has been reduced to below the non-detectable odor threshold of less than 0.05 mg/L.
Richard Cavagnaro is marketing coordinator for AdEdge Water Technologies LLC. Cavagnaro can be reached at [email protected].