Soluble COD removal.

Hello dear all.

In a paper mill, we have have high value for the soluble COD in the final effluent discharge 3700 ppm.

It's needed to be reduced to 800 ppm.

Apart from the biological system, if anyone has a suitable solution for this problem, we will be thankful. 

Thanks in advance. 

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Taxonomy

• Pulp & Paper
• Effluent
• COD Removal
• Chemical Engineering
• Pulp & Paper
• Technologies & Equipment

23 Answers

1. Dear Mohammed,

   
   
   

   I have seen the photos you sent and it seems to me that the two Krofta type DAFs you are using are over loaded or more easily that the chemicals dosage is not efficient.
   
   The elimination of the soluble organic substance is done in most cases biologically.
   
   In your case with a COD of 3700 mg / l and probably with a water temperature above 35 ° C I recommend the anaerobic biological treatment.
   
   A UASB plant, widely used in the paper mill, has no problems in reducing COD below 800 mg / l, has low management and maintenance costs, low sludge production and does not require nutrients.
   
   The investment cost is high, but if biogas is recovered, the cost / benefit ratio is certainly attractive.

   
   
   

   Vincenzo

   1 Comment

   1. Thanks dear Mr. Vincenzo, Could u kindly recommend some UASB suppliers ?

       

2. Hello Mohammed,

   
   
   

   My comment is around monitoring.  You may want to have a quick and safe method for measuring the COD to confirm final effluent COD and treatment optimization including nutrient optimization.  Learn why many pulp mills now use the PeCOD COD Analyzer, a true green method providing results in 10 minutes.  Visit www.mantech-inc.com or email me directly at rmenegotto@mantech-inc.com.  WhatsApp +1 519 835 5252

   
   
   

   Kind Regards, Robert Menegotto, CEO

   1 Comment

   1. Thanks for your appreciated advice. 

       

      Could you kindly let me know how much does it cost  ?

3. Dear Mr. Mohammed

   
   
   

   For last reply I sharing my idea to you to us MBR. But lastweek I went paper which which be faced with the Problem of Effluent same like you. Ok firstly You need long HRT for Anaerobic at least 5- 15 days in Thailand we use Modified Cover lagoon with De-sludge pipe with Acid pond to increasing VFA higher.For UASB here is not work because it is to short HRT, only 12 hrs the efficiency is only 65%, I solved this task by design new MCL sizing 45,000m3 now under construction. And after treated by UASB you need settling pond then COD of the Effluent will be decrease quit much or you can dosing PAC, Alum with less of polymer to settle down all SS. And these will lead to increasing  aearation to treat wastewater to reach std. Finally if you install MBR everything will be reach WW std and you can reuse water to the process line.

   
   
   

   Best Regards

   
   
   

   AGGASIT DAD

   
   
   

   aggasit2012@gmail.com

   
   
   

   WhatsApp +66917027747 BKK Thailand

   1 Comment

   1. Thanks dear Mr. Aggasit.

       

      But we have limited area, about 50 m² only available. 

      So can we establish a system in this area ?

      1 Comment reply

      1. Dear Mr. Aggasit, How r u 

         Recommend  some MBR suppliers.

4. I believe folks are misreading the post. The 3700 ppm of COD, in the final effluent, is after biological treatment.  Is this correct Mr. Sonbol?

   1 Comment

   1. Sorry dear Mr. Tom, we don't have any biological treatment. 

      It's only screen then DAF unit .

5. Hi,

   I totally agree with Mr. DAD, MBR may be a solution to treat this high concentration of COD, for me I think you can use physical and chimical treatement by coagulation and floculation and then use a biological treatement by MBR.

   Best Regards.

    

   AIT IHIA OTMAN.

   1 Comment

   1. I already use PAC and PAM for coagulation and flocculation in the DAF unit, but after that soluble COD is still high although TSS is 90 ppm.

6. Dear Mohammed,

   I have more than 40 years experience treating industrial wastewater and your problem is not an uncommon one but first things must come first, data on your mill and material source. Also way more data on the treatment system and what the COD is made up of.

   if you care to share this with me I can try to suggest what a solution could be. 
   You can email me at

   faganj53@yahoo.com.

   happy to help if I can.

   John Fagan

   1 Comment

   1. Kindly check your mail. 

7. Dear Mohammed,

   I agree with the comment of Thomas Gertz to use a high rate UASB to convert most soluble COD to biogas and thereby producing more energy than consumed.

   Removing soluble COD by filtration, floatation or settling is nonesense and using AOP's at such high COD would be terribly expensive.

   2 Comments

   1. I totally agree with you .

       

      But there is no area enough to establish this system. 

      So we're looking for the compact system that use limited space. 

   2. I would agree with the UASB as a treatment option but would suggest that biodegradability is confirmed before going this route. Regards Andre

8. The following paper is a good discussion on recalcitrant organic compounds which could be the source of your COD, P&P effluent is noted for this and are not biodegradable.

   https://bioresources.cnr.ncsu.edu/resources/wastewater-treatment-and-reclamation-a-review-of-pulp-and-paper-industry-practices-and-opportunities/

    

   2 Comments

   1. but what is P&P ?

   2. Thank u.

      Will check it. 

9. HI Mohammed, I suggest that you analyse for organic and inorganic TDS to determine the organic TDS which will be the source of your soluble COD. Once known you can size an Ozone generator to inject the theoretical stoichiometric amount of O3 to the desired excess (800mg/L?) COD.

   1 Comment

   1. Could u kindly let me know amount of ozone required for 2000 m3/day plant?

10. new filtermaterial 

    1 Comment

    1. Dear Mr. Reiner, Let me know more about its requirements for 2000 m3/day plant regarding area required, capex and opex.

11. can you use Fenton reagent for reduction of high COD

    1 Comment

    1. Thanks dear Brijesh, will check it.

       But it need a step to remove the excess of H2O2 before measuring COD.

12. The most COD in paper industrial wastewater is as TDS, for the biodegradability in bioreactor a continuously external nutrients are required, which bring the operating costs up.

    We recommend our lamella clarifier TUBEdek® to reduce the TSS, and thus the COD. CAPEX and OPEX can be significantly be reduced. For further more details, look on: www.enexio.com and don’t hesitate to contact me: youssef.rannane@enexio.com

    Best Regards

    1 Comment

    1. Kindly check ur mail.

       Bty, Will the lamella ​clarifier ​TUBEdek® reduce the COD ?

13. We just ran a pilot scale test at a paper mill where we were able to demonstrate reduction of BOD from almost 6,000 mg/L to less than 400 mg/L. 

    Dr. Rakesh Govind

    Water Warriors

    cell: 513 673 3583

    1 Comment

    1. Great !

       But our problem is with COD, not BOD because BOD is already reduced to required limit < 600 ppm

       Kindly let me more about ur pilot plant, method of treatment, process steps, chemicals used, ...

14. Mohammed

    COD or some of it can be reduced by activated carbon. Depending upon flow rate or total GPD that can be expensive and may or may not reach the desired level goal.  With some testing the application of EC (electrocoagulation) has been very successful.

     

    Glenn

     

    1 Comment

    1. Thanks dear Mr. Glenn

       The amount is 2000 m3/day

15. Dear Mr. Mohammed

    Regarding from your request base on soluble COD 3000 ppm, I do not think so. You need only Biological , AS ,MBR which can treat we to reach std to discharge. But in my point of view this soluble COD is TDS. I need more information from you, 

    Best Regards

    AGGASIT DAD

16. Dear Mr. Mohammed

    Regarding from your request base on soluble COD 3000 ppm, I do not think so. You need only Biological , AS ,MBR which can treat we to reach std to discharge. But in my point of view this soluble COD is TDS. I need more information from you, 

    Best Regards

    AGGASIT DAD

    1 Comment

    1. TDS is 3500 ppm

       Kindly let me what information u need.

17. Use cogulants & flocculants to reduce TSS.COD will automatically reduce.

    1 Comment

    1. TSS is 120 ppm !!!

       To what extent do u recommend to reduce TSS ?

18. Dear Mohammad, please do let us know in which stage of treatment process you are getting 3000ppm COD. BAsed on that we can suggest which type of process can be used. 

    1 Comment

    1. At final effluent .

19. Soluble COD in paper mill effluent can be treated by high rate anaerobic processes such as UASB which will yield biogas fuel.   Effluents such as yours can usually be treated with a favorable financial return on investment.   In other words, if you can invest capital  it will pay for itself.    

    1 Comment

    1. Kindly recommend UASB supplier.

20. Dear Mohammed,

    I suggest our AOP to re-purify any kind and flow of wastewater into potable effluent to reuse safely in your paper process with 95% recovery efficiency at least, zero emission to air-water-soil, and low operating costs between another advantages.

    We are pioneers in wastewater recycling since 2003; we warrant lower than 500 ppm effluent as usual standard of our technology performance.

    Regards,

    inprosu-ze.com.mx

    inprosu.ze@gmail.com 

    1 Comment

    1. Very interesting. but Do u have projects in Paper Mills ?

       I have sent u email, kindly check it.

21. Mr Mohamed Sonbol

    At what level do you get 3700 ppm? why reduce to 800 ppm?

     

    1 Comment

    1. we get 3700  after DAF2

       we need to reduce to 800 ppm to comply with discharge law.

22. In my experience, most soluble COD is actually biodegradable after acclimation of waste treatment organisms.  Verify P and N levels. Running a series of tests in a respirometer can be a simple way to initially assess biodegradabiity. If results are promising, do a flow through treatability test.  If the waste is found to be not biodegradable, physicochemical treatment should be considered.

    1 Comment

    1. Thanks dear Mr. Jose.

       Let me know what is the physicochemical treatment required?

23. Try using hydrodynamic caviitation.  We can make a device specifically for you. All i need to know is pipe size, pressure, temp and flow rate.  Email: peoplesnrg@gmail.com

    1 Comment

    1. Kindly check ur mail.