Reduce the COD of the plastic recycling effluent

Question

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

Gokul Ragupathi · Answer

HI, this is Gokul from Confident engineering India Private Limited,India 
We are providing water treatment solution for industries 
we are treating water by Electro Coagulation Method 
Please feel free to contact me for more details at
confidentgokul@outlook.com
+919585548153

Rajendrakumar Saraf · Answer

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

Julia Woods · Answer

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Michael Anderson · Answer

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

Henry Boyter · Answer

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.

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