The addition of permanganate directly to sanitary wastewater and commercial/industrial wastewater solves many operational problems caused by odors, dissolved sulfides, high oxygen demands, grease accumulation, metal and concrete corrosion, and pollutant toxicity. Importantly, its strength means that it reacts rapidly - within minutes. Permanganate’s reactivity will fragment (oxidize) organic compounds, easily breaking double bonds, changing their structure and altering the chemical groups that are responsible for many odors. These odor-causing chemicals are unhealthy for exposed workers, corrosive to plant equipment, and a nuisance to the public.
The most common odor compound in wastewater is hydrogen sulfide, although mercaptans, amines, and other volatile organics are also formed in significant levels. Permanganate effectively destroys these compounds, eliminating the odor.
Where to Apply Permanganate
Permanganate is successfully applied to treatment processes where it can destroy odor compounds before they are released by turbulent wastewater flow. Collection systems, pump stations and forced or gravity flow pipelines all commonly generate and release odors. At the treatment plant, influent structures, grit removal units, screens, flumes, clarifiers, and aeration basins can be odor sources. Because it is safe, permanganate has been added to primary effluent, return activated sludge lines, and aerobic digesters to eliminate odors. Importantly, when applied at less than 80 mg/L, there is no adverse impact to the biological treatment processes.
Since solids handling, thickening and dewatering equipment release high odor levels, these are often areas for permanganate treatment. Solids dewatering systems, such as centrifuges, belt filter or screw presses, lagoons, windrow operations and drying beds, all benefit the most from permanganate treatment. In dewatering equipment there is little time for slow, incomplete odor treatment. Permanganate reacts quickly and it is very effective. There are also additional benefits. Permanganate odor control improves the efficiency of common polymers and dewatered cake often has higher solids content. Permanganate treatment also eliminates centrate and filtrate odors in the dewatering area and at the process headworks, where these waste streams are recycled to the treatment plant. After permanganate addition, there are no sulfides to adversely impact the treatment process by consuming dissolved oxygen.
For treatment facilities receiving septic waste by truck, odors are often released at the receiving site. Permanganate is injected into the septic waste as it is discharged, eliminating all odors.