Common manganese salts in aqueous solutions and their removal/purification technologies
Manganese-bearing waters are usually described by the measured manganese concentration and oxidation state, not by a single dissolved “manganese salt.” In reducing groundwater, dissolved Mn(II) is common; when conditions become more oxidizing, manganese can form less-soluble oxide particles and deposits.
How to read this page: Manganese salts dissociate into ions in water. The compounds below are representative chemicals used in industry or water treatment; their presence is process-specific and should not be assumed in ordinary groundwater. Water analyses typically report dissolved or total manganese rather than identify a particular salt.
Common manganese salts and compounds in aqueous streams
| Compound | Formula | Typical application / industry / where used | Typical aqueous streams where encountered |
|---|---|---|---|
| Manganese sulfate | MnSO4 (often hydrated) | Fertilizer and micronutrient production, ore flotation, dyeing, ceramics and specialty chemicals. | Fertilizer and chemical manufacturing wastewater, mineral-processing liquors, flotation water and equipment wash water where manganese sulfate is used. |
| Manganese chloride | MnCl2 (often hydrated) | Precursor for other manganese compounds; also used in fertilizer, dyeing, feed and chemical manufacture. | Process liquors, rinse water and wastewater from manganese-chemical production or operations using manganese chloride. |
| Manganese nitrate | Mn(NO3)2 | Specialty chemical and ceramic manufacture; precursor for manganese dioxide and other compounds. | Manufacturing solutions, wash waters and process wastewater where manganese nitrate is used. |
| Manganese acetate | Mn(CH3COO)2 | Textile dyeing, fertilizer, coating and chemical applications. | Dye-bath wastewater, product wash waters and chemical-process streams where the acetate is used. |
| Manganese carbonate | MnCO3 | Pigments, ceramics, micronutrient products and manufacture of other manganese compounds. | Slurries, wash water and process wastewater from production or use. It is poorly soluble in water, so manganese may be present as suspended solids or may dissolve under acidic conditions. |
| Potassium permanganate (water-treatment reagent) | KMnO4 | Oxidant used in some water-treatment and industrial processes; it is not a typical natural-water manganese salt. | Reagent make-up, dosing and wash streams. During treatment, permanganate reacts and manganese may form oxide solids that must be separated. |
| Manganese oxides (not salts) | For example, MnO2 | Batteries, pigments, catalysts and oxidation-filter media. | Filter backwash, slurries and process residuals. Many manganese oxides are poorly soluble and occur as particles rather than dissolved ions. |
Salt solubility and manganese speciation depend on the compound, hydration state, pH, redox conditions and other dissolved ions. Soluble manganese salts can supply dissolved Mn(II), but a natural-water sample with dissolved manganese should not automatically be attributed to manganese sulfate, chloride or another specific salt. Under oxidizing conditions, manganese oxides may precipitate and contribute to dark deposits.
Manganese removal, purification and residual management
The suitable process depends on whether manganese is dissolved, particulate or present in a concentrated industrial stream. Treatment should be selected from a representative water analysis and confirmed by testing.
| Water-treatment challenge | Potential process route | Selection notes |
|---|---|---|
| Dissolved Mn(II) in groundwater or drinking-water feed | Oxidation followed by filtration, using air or an appropriate oxidant; catalytic media or manganese greensand may be used in suitable systems. | Oxidation and removal depend on pH, redox conditions, contact time, manganese concentration and co-occurring constituents such as iron. Filter backwash and spent media need appropriate management. |
| Particulate manganese oxides or existing deposits | Clarification or filtration, sometimes with coagulation or other pretreatment. | Conventional filtration can capture particles but does not necessarily remove dissolved Mn(II) unless it is first converted to a separable form. |
| Higher-strength industrial or mining process water | Controlled oxidation or precipitation followed by solids separation; site-specific biological or physicochemical treatment may also be assessed. | Acidity, alkalinity, sulfate, other metals and residual-sludge characteristics influence reagent demand, separation and disposal. |
| Manganese alongside other dissolved salts or stringent product-water requirements | Reverse osmosis or, for selected applications, ion exchange as part of an integrated treatment train. | These options produce a concentrate or regeneration stream and may require pretreatment. Confirm manganese performance and residual management for the actual water. |
For additional information about manganese occurrence and standard removal processes, see Manganese in water and manganese removal by physical-chemical treatment.
Discuss a manganese-bearing water or process stream
A representative analysis should identify total and dissolved manganese, pH, alkalinity, redox conditions, iron and other relevant ions, along with flow and the required treated-water quality. This helps determine whether oxidation and filtration, selective treatment or a broader separation process should be evaluated.
Discuss a water-treatment challenge
To discuss a specific manganese-bearing water or process stream, contact Lenntech at info@lenntech.com.
Last reviewed: 7 November 2026 by Lenntech.
Sources and further reading
- World Health Organization: Chemical fact sheet on manganese.
- U.S. EPA: Addressing manganese in drinking water — treatment technologies and case studies.
- U.S. Geological Survey: Manganese in groundwater.
- Australian Government: Manganese and compounds — uses and water solubility.
- WHO/IPCS: Manganese and its compounds — environmental aspects.