Reduce the COD of the plastic recycling effluent

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Please can someone provide advice about a good method to reduce the COD of plastic recycling effluent.

note - the effluent BOD is zero.

Much appreciated

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10 Answers

  2. Dear Mr. Asanka

    The detail analysis of effluent is required. You have mention that BOD of effluent from plastic recycling is zero. It means COD is contributed by non biodegradable organic & reducing inorganic chemicals. It means no biological treatment can remove non biodegradable compounds from effluent.

    The probable answers are as below.

    a. Soluble & colloidal non biodegradable organic compounds – Flocculation, sand Filtration and & activated carbon filtration can give the good result

    b. Soluble reducing non biodegradable – Mostly inorganic – RO will be the only alternative.

    c. Insoluble / colloidal non biodegradable organic & inorganic – Flocculation,  Sedimentation, Sand filtration and Activated carbon filtration.

    More alternative can be developed. For details please contact at rvsveipl@gmail.com

     

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  4. Hi at Aerofloat (Australia), we've completed a few projects for plastic recycling companies. Using our patented Aeration and Patented AeroDAF, we recycle the water for the plastic washing process.

    A typical process is Sweco Screen > AeroMBBR > AeroDAF > Return to wash plant. This maintains an odourless low TSS wash water, improving the quality of the finished plastic and reducing maintenance on pellet machines. 

    For Zero BOD, you would require chemical addition to the DAF for improved clarification of MBBR biosolids and fine solids from the washing process, + possible filtration off DAF effluent Sand filter or UF perhaps. 

    Cheers
    Michael 
    www.aerofloat.com.au

  5. Run a series of filtration steps (TSS, membrane, ultra, nano) to see if the COD is due to solids or something that can be treated. Then give us the data on this and the types of plastic recycled and the type of recycling.

  6. Let's start with the basics.  What is your TSS level?  Also look at the level of non-biodegradable oils in your effluent.  COD will reduce and measure lots of compounds that BOD bypasses because the BOD test is unreliable at low levels.  One of the things which can interfere with the COD test is chlorides.  Check your chloride levels and consult the Hach.com website for interference with the COD test.  TSS can also give you a high reading on COD but won't show up on BOD.

  7. Bonjour les termes DBO et DCO correspondent à un modèle de traitement des eaux usées domestiques. ils n'ont aucun rapport avec le traitement du plastic qui flottent dans un liquide comprenant de l'eau qui sert uniquement au transport.

    La DBO est la demande en oxygène biologique, la DCO est la demande d'oxygène chimique.

    Ces deux demandent définissent l'état du milieu liquide et n'ont rien à  voir avec la matière en suspension qui n'est pas organique: le plastic.

    un process inventé en France élimine le plastic et produit de l'essence 

    Hello the terms DBO and DCO correspond to a model of domestic wastewater treatment. they have nothing to do with the treatment of plastic that float in a liquid containing water that is only used for transport.

    BOD is the demand for biological oxygen, THE DCO is the demand for chemical oxygen.

    These two ask define the state of the liquid medium and have nothing to do with suspended matter that is not organic: plastic.

    a process invented in France eliminates plastic and produces gasoline 

  8. Data provided is sparse, but first of all, try filtration down to low microns, next try activated carbon filtration, or a lime bed (to take out any organic acids that should combine with calcium).

    Lastly, I would look at a UV system if all else fails, or an advanced oxidation using OH radical (the actual top oxidant in water).

  9. Not enough data. Try filtration through the  activated carbon.