Nitrate Removal of Industrial Effluents

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We are working to find a solution for Nitrate removal, from an effluent contaminated with Nitrates (1,600 ppm). Nitrate is found as a salt of K+ in the effluent.

The effluent water volumes range from 600-800 m3/d. The expectation is to bring the NO3- to 30 ppm. appreciate expertise.   

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17 Answers

  2. Dear Aquablu,
     

    You could use the RO after remove the COD and the system solids.

     

    In most of the cases the most economical path to remove the COD is biological. Maybe in this case the COD could be remove (if it is not recalcitrant) using the biological way.

     

    I think some of the steps that could be explored are:

     

    COD removal (Biologic1: Anaerobic or MBBR Aerobic) >> COD removal (Biologic2; MBBR) >> AOP (Ozonation, if it is necessary) >> MF >> Membrane filtration >> Evaporation of the obtained concentrate

     

    I recommend you a pilot test of the suggested system you decide use or explore.

    With our technical partners we can help you with some of this steps.

     

    If you have enought area and climate you could evaporate all the water or just the concentrate.

     

    Regards,

    Orlando D. Gutiérrez Coronado

  3. I like to receive the detailed water quality report to discuss how I can join you to conduct a study &   find how to  sttend to your problem.

    i AM kOLONNE WIJERATNE -Environmental Engineer ,Living  near Colombo Srilanka. My email no is --kolonnewijeratne@gmail.com

    1 Comment

  4. If the nitrate were the only concern, it could be discharged to sewer directly. In the sewer, it will denitrified and converted into nitrogen gas. The benefit would be additional oxygen to control the anaerobic condition of the sewer. It is common practice to add nitrate salt into the sewer system.

    1 Comment

  6.  Nitrate is present as Potassium Nitrate. You are draining out 1552.6 to 2073.6 kg of Potassium Nitrate per day in the effluent. KNO3 is used as fertilizer. Please send the detail analysis to develop the recovery process for KNO3.

    Rajendrakumar V Saraf, FIE, FIWWA

    Chairman

     Viraj Envirozing India Pvt. Ltd

    21, Radhakrishna, Near SBI, Paud Road

    Pune 41038

    Tel 02025433445, 9822186763

    www.virajenvirozing.com

     

    2 Comments

    1. Hello 

      Thank you, for the suggestion  ​​please check ​​the flowing , ​​which may be ​​useful ​ ​

      the source of ​​​water is due ​to ​​a ​buffering ​​​process carried ​​​out to cation ​​​exchange ​ ​​Ca++ with K+ ​in ​​a natural ​grow ​​Medea (​Coconut ​Peath )​ . ​ ​ ​

      Ca++ is ​​​introduced as ​​​Ca(NO3)2 . Pls ​​​check the ​​​results of the ​​​analysis. ​

      In addition to K+ there is Ca++ and Na+ in ​considerable amounts. 

      However pls check bellow the current analytical report. We will be doing a fresh assessment  of the effluent again with mote details on the Cations present. will let you Have that as well, soon. 

       

      Water volume 800-1,000m3/d​

       Conductivity:4800MicS/cm

      COD:  1150

      BOD:125

      pH5.5-6.5

      Chlorides659

      Other ​​​parameters (​​​Minerals, etc):​​​

      Nitrate as No3 ​​​: 1100 - 1750 ​​​mg/l ​
      Nitrite as ​​​No2 : 30 - 60 ​​​mg/l

      Our objective:  To remove NO3- ​​​to 30ppm or ​​​closer.​​​

      Discharge limits to achieve,

      COD 400ppm / ​​​BOD 250ppm / ​​​NO3- 30ppm / ​ ​​
      Cl- 600ppm ( ​​​as CL ) / ​​​Conductivity ​​​2250MicS/​​cm

    2. May you sent more analytical data and the source of this waste water that will help all everyone can sharing on the right way. KNO3 is salt you can use RO 

      with costly so before this waste is produced you can  find out many way to solve with low price. aggasit2012@gmail.com. BKK Thailand 

      1 Comment reply

      1. Hello 

        Thank you, for ​the suggestion ​ ​​please check ​​​the flowing , ​​​which may be ​​​useful ​ ​ ​

        the source of ​​​​water is due ​​to ​​a ​​buffering ​​​​process carried ​​​​out to ​cation ​​​​exchange ​ ​​​Ca++ with K+ ​​in ​​a natural ​​grow ​​Medea (​​Coconut ​Peath )​​ . ​ ​ ​ ​

        Ca++ is ​​​​introduced as ​​​​Ca(NO3)2 . Pls ​​​​check the ​​​​results of the ​​​​analysis. ​ We have carried our trial to substitute the Ca(NO3)2. We used CaCl2 & Ca(OH)2 , but the cation exchange rate was not satisfactory. ​

        In addition to ​K+ there is Ca++​ and Na+ in ​​considerable ​amounts in the effluent . ​

        However pls ​check bellow ​the current ​analytical ​report. We will ​be doing a ​fresh ​assessment ​ of the ​effluent again ​with mote ​details on the ​Cations present.​ will let you ​Have that as ​well, soon.​  ​

        Water volume 800-1,000m3/d​

         Conductivity:4800MicS/cm

        COD:  1150

        BOD:125

        pH5.5-6.5

        Chlorides659

        Other ​​​​parameters (​​​​Minerals, etc):​​​​

        Nitrate as No3 ​​​​: 1100 - ​1750 ​​​mg/l ​ ​
        Nitrite as ​​​​No2 : 30 - 60 ​​​​mg/l

        Our objective:  To remove NO3- ​​​​to 30ppm or ​​​​closer.​​​​

        Discharge limits to achieve,

        COD 400ppm / ​​​​BOD 250ppm / ​​​​NO3- 30ppm / ​ ​​​
        Cl- 600ppm ( ​​​​as CL ) / ​​​​Conductivity ​​​​2250MicS/​​​cm

  8. Pl provide complete details about the process which generates waste water with complete analysis. 

    1 Comment

    1. Hello Raman 

      Thank you, please check the flowing , which may be useful

      the source of ​water is due to ​a buffering ​process carried ​out to cation ​exchange  ​Ca++ with K+ in ​a natural grow ​Medea (Coconut Peath ) . ​

      Ca++ is ​introduced as ​Ca(NO3)2 . Pls ​check the ​results of the ​analysis.

      Water volume 800-1,000m3/d​

       Conductivity:4800MicS/cm

      COD:  1150

      BOD:125

      pH5.5-6.5

      Chlorides659

      Other ​parameters (​Minerals, etc):​

      Nitrate as No3 ​: 1100 - 1750 ​mg/l
      Nitrite as ​No2 : 30 - 60 ​mg/l

      Our objective:  To remove NO3- ​to 30ppm or ​closer.​

      Discharge limits to achieve,

      COD 400ppm / ​BOD 250ppm / ​NO3- 30ppm / ​
      Cl- 600ppm ( ​as CL ) / ​Conductivity ​2250MicS/cm

       

  9. It is important to mention the existing treatment system to know why the effluent is nitrified. Please give some highlight on the treatment processes.  

    1 Comment

    1. Hello Dinkissa

      Thank you, ​please check ​the flowing , ​which may be ​useful ​

      the source of ​​water is due to ​​a buffering ​​process carried ​​out to cation ​​exchange  ​​Ca++ with K+ in ​​a natural grow ​​Medea (Coconut ​Peath ) . ​ ​

      Ca++ is ​​introduced as ​​Ca(NO3)2 . Pls ​​check the ​​results of the ​​analysis. ​

      Water volume 800-1,000m3/d​

       Conductivity:4800MicS/cm

      COD:  1150

      BOD:125

      pH5.5-6.5

      Chlorides659

      Other ​​parameters (​​Minerals, etc):​​

      Nitrate as No3 ​​: 1100 - 1750 ​​mg/l
      Nitrite as ​​No2 : 30 - 60 ​​mg/l

      Our objective:  To remove NO3- ​​to 30ppm or ​​closer.​​

      Discharge limits to achieve,

      COD 400ppm / ​​BOD 250ppm / ​​NO3- 30ppm / ​ ​
      Cl- 600ppm ( ​​as CL ) / ​​Conductivity ​​2250MicS/​cm

  11. You could consider using the Annamox process. I am not sure when the nitrate concentration is that high. There is a paper here by colleagues at the University of Queensland. https://pubs.acs.org/doi/abs/10.1021/es402775z?journalCode=esthag

    1 Comment

    1. Thanks Mark for the suggestion, we have looked at the Annamox biological denitrification, but the available "C" content was a hindrance. However we will go through your link to learn more. 

  13. Dear Aquablu Lanka,

    Considering that potassium K+ is the counterion of the nitrate NO3- to be removed, I would recommend to consider to recover KNO3 which is a valuable fertilizer and raw material in various production processes.

    In this way, your wastewater produces revenue instead of consuming a lot of money to reduce nitrate to nitrogen gas and to remove the corresponding potassium as in the conventional wastewater treatment approach.

    1 Comment

    1. Hello Bruno 

      Thanks for the suggestion, we are in search for a technology for a cost effective Evaporation , to concentrate this water, since the water volume is quite high. 800-1000m3/d. 

      As you suggested we plan to check the potential of making a concentrated liquid fertilizer. 

      1 Comment reply

      1. Hello Aquablu Lanka,

        Thanks. Evaporating such a high volume of water requires a huge amount of energy and is not really sustainable even when using solar energy. Instead I would recommend to first concentrate the KNO3 using NF/RO membranes as to recover clean water for reuse and then evaporate the RO concentrate with the KNO3.

        Regards, Bruno

  14. Dear Aquablu,

     

    Ther are many ways to remove the ntrates, but it will be good have a complete analysis and commments about the wastewater and previous process.

    Please describe the process that generrates this wastewater and post a lab analysis.

     

    Regards,

     

    Orlando D. Gutiérrez Coronado

    1 Comment

    1. Hello Orlando ..

      the source of water is due to a buffering process carried out to cation exchange  Ca++ with K+ in a natural grow Medea.

      Ca++ is introduced as Ca(NO3)2 . Pls check the results of the analysis.

       Conductivity:4800MicS/cm

      COD:  1150

      BOD:125

      pH5.5-6.5

      Chlorides659

      Other parameters (Minerals, etc):

      Nitrate as No3 : 1100 - 1750 mg/l
      Nitrite as No2 : 30 - 60 mg/l

      Our objective:  To remove NO3- to 30ppm or closer.

      Discharge limits to achieve,

      COD 400ppm / BOD 250ppm / NO3- 30ppm /
      Cl- 600ppm ( as CL ) / Conductivity 2250MicS/cm

       

  16. Do you have a full analysis of the effluent? Where is the effluent being dispossed of and what apart from the NO3 is the criteria for dispossal?

    We can remove any organic and heavy metals from the effluent.

    Please can you email the info to me office@gictechs.com and I will pass it to the tech boys.

    If they say they can help they will want a 5 litre sample to prove it and give you a quote,

    To get some info on our equipment www.gictechs.com

     

  17. Hello  

    That is  a very interesting project to work on. Can you get a detailed analysis of the effluent and also its origin? 

    Kindly send us details on amit.levapor@gmail.com and We can help you with this project. 

     

    With Regards

     

    Amit 

     

    2 Comments

    2. Please  send me information a about  the wastewater composition (inorganic chemical analysis).