Removal of Manganese from Borehole Water Without Chemicals

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Iron is sufficiently removed by greensand, but manganese not! Chemical dosing is not allowed, what filter can be used?

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21 Answers

  2. For about 10 years we have been solving similar problems with the systems of complex water purification of hard water- SKV. 

    This is the installation patented by H2O Water treatment system LLC (www.h2o-72.ru).

    In addition to iron removal, the installation performs parallel disinfection of water from the well, removal of dissolved gases, reduction of manganese and ammonia, permanganate oxidation, normalization of organoleptic properties (color, turbidity, odor, taste).

    All this without the use of chlorine and other reagents!

    For the selection of the correct installation model, please send a water analysis to e-mail: h2o-72@ya.ru

  4.  

    You have not post any other data, but in an ideal system we can suggest ozonation and filtration.

     

     

     

  5. Dear Vincent,

    See the message of M. Musyafa Wiryanto in the subject: "Removal of iron in Borewell water without chemicals".

    It is possible to try and other simple options. For example, a filter with crushed green glass after effective aeration.

  6. We clean numerous boreholes from Mn and Fe with electrochemical means succesfylly.

  7. I respectfully disagree with some of the respondents below.  Manganese can be precipitated at pH 7 without chemicals in an aerobic wetland environment.  Iron must be virtually absent.  The reaction is facilitated by cyanobacteria/algae which utilize the Mn to create hold-fasts that allow them to anchor themselves to rocks, etc.  See the attached 1999 paper by E. Robbins et al. that identified 11 different biota, including Leptothrix discophora and Ulothrix algae that were precipitating MnO2 in a constructed wetland in the USA.  The reaction is basically powered by sunshine/photosynthesis.  We used this process to design a passive treatment system to lower Mn concentrations from over 3 mg/L to less than 50 ppb (again, without chemicals) at a peak flow rate of 4,542 L/min at the Empire Mine State Historic Park in California, USA.  That system has been operational since 2011.  A paper documenting the design process (Gusek et al., 2011) is attached.  Use this as a guide to bench and pilot scale testing.  The manganese removal portion of the passive treatment system at the Empire Mine covered about 4,520 square meters of surface area.  Over time, manganese oxide deposits accumulate into "manganocrete", which can also be observed in the geologic record.   Mother Nature has been using this process for eons...

  8. The manganese present in dissolved form will have to be precipitated, followed by filteration

  9. Grant and Tim,

    please be aware of UV light and Manganese in water at > 50 pub levels as it dot in the Quartz sleeve and decrease UV radiation, So there fore no use.  

  10. I would agree with Tim in the Ozone/ UV side of things. Our company has also developed a natural/ organic media that removes a lot of the heavy metals. This could also be an option subject to cost and time.

  11. No concrete answer may be provided without the complete description of the scenario. However, take a look at advanced oxidation, using ozone and UV. the hydroxyl ion formed reacts very quickly  to oxidize metals present, which precipitate out of phase a lot easier and can be removed through filtration. 
    For this you would have to do lab/pilot work with the subject water to determine how much you need. Note that other compounds will also be oxidized. 

  12. See Terry's comment! Any answer, given by any of the 'expert' here is irrelevant unless you give the whole picture regarding the influent, effluent, volumes, flow rate etc'

     

  13. Basically it is the dubious decision to exclude chemical solutions that is frustrating a reasonable cost solution. An oxidising agent is needed. Oxygen from air can work but only at a high pH and so is not generally effective. Manganese dioxide material in filter media will act as a catalyst and reduce the pH requirement but is still not massively effective without chlorine. 

     

  14. Good Afternoon Mr. Zeelie;

    Up to 5 ppm Mn can be removed with cation softening.   A complete water analysis, pipe size and flow rate are required to confirm.

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  15. Just a guess that the Mn is in solution as Mn2+ ions which implies that  conditions are reducing.  One way of removing the manganese might be to install an oxidizing substrate filter such as granular MnO2, followed by a water softener. These would need to be changed periodically as reducing conditions will eventually resolubilize the Mn. Aeration, followed by simple filtration (perhaps using chalk) might be enough.

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  17. Depending on the pH-Value (recommendation >6,5) of the water, we can suggest using our filter material FILTRAPLUS Mn to remove manganese. You will only need enough oxidation potential (air will do) and our FILTRAPLUS Mn will be the catalyser for the removement of manganese. You can send me your raw water analysis as well as the required flow and I am glad to give you our recommendation and quotation for the required amount of FILTRAPLUS Mn.

  18. Dissolved Mn has to be converted to the oxidized state of Mn02. This requires either the use of chemicals (permanganate or some other oxidant) or raising the pH very high in the presence of dissolved oxygen (again you need a chemical) You can you pyrolusite (solid Mn02 as a catalyst) or greensand (substrate coated with Mn02) but the surface oxidation state will become exhausted and it will need some sort of period regeneration. No matter what you do it will involve some sort of chemistry. Mn can be challenging and is often "fussy" to remove. 

    If your Mn is not coming out on fresh greensand (is in a regenerated state) then the contact time is too low (slow down the flow through the material) or the Mn is complexed with some sort of organic or chelating agent (ammonia for example). 

    You may not find a solution without adding some sort chemical. 

  21. Vincent depends on your flow.  You can oxidise it for larger flows or you can use an RO unit.  We sometimes have issues with iron and Manganese in the water that we use in the Aquadron, we tend to use a small RO unit straight before our particulate filters.