Industrial waste with low pH (1-2) and high COD (4000 ppm) was neutralized with lime and its pH reaches to 9...is this treatment effects on COD level too?
what's the final COD after neutralization?
pH adjustment does not affect the COD value unless oxidation, adsorption, co-precipitation or other reactions occur during or after pH adjustment. Check whether there is precipitate formed during the process. If yes, there might be some impact on the COD value, but usually the impact is not significant.
Note: the mechanism for the removal of COD by coagulation is co-precipitation and/adsorption.
Dear Helena
i think it will be act as coagulant matter so it will reduce the value of COD
the level of COD after that depend on the dose of lime used
may be this will help you
http://www.iasj.net/iasj?func=fulltext&aId=29421
http://www.iasj.net/iasj?func=fulltext&aId=29425
https://web.anl.gov/PCS/acsfuel/preprint%20archive/Files/14_1_TORONTO_05-70_0028.pdf
http://www.bioline.org.br/pdf?se07005
http://www.iwtc.info/2010_pdf/05-02.pdf
http://www.bioline.org.br/pdf?st06019
Both Dr. Chengjin and Dr. Waleed are true and I recommend their answers.
Thanks
I think it depends on materials that increase COD,...may be lime coagulate these material.
in my case most COD is caused by organic components like SBA, alcohol
Textile wastewater treatment with lime resulted to 50-60% removal of COD due to co-precipitation. Calcium carbonate was the main precipitate. So, treatment with lime can indeed lead to important removal of dissolved organic load (COD)...
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