7 replies to this topic

[curious_cat]

When treating typical industrial effluents with aerobic bacteria what are typical COD (Chemical Oxygen Demand) values that can be accepted as input streams?

 

Also, how low  a COD is it reasonable to expect at the outlet of bio-treatment without any downstream polishing units such as Reverse Osmosis or Advanced Oxidation?

 

I'm trying to estimate in a preliminary design how much of extraction is needed from an aqueous effluent stream contaminated with organics before it might be reasonable to expect bio-treatment to work on the residual organics. 

 

PS. None of the organics are acutely toxic. They only contribute to overall oxygen demand. 

Edited by curious_cat, 28 April 2015 - 10:11 PM.

[breizh]

Hi ,
In my plant from 12000 ppm down to 200 ppm using air blower (aerobic treatment).

hope this helps

Breizh

[curious_cat]

Hi ,
In my plant from 12000 ppm down to 200 ppm using air blower (aerobic treatment).

 

Thanks breizh! Helps a lot.

 

More questions:

 

(1) Just to clarify, you mean bio-treatment, not just air stripping, correct? i.e. The organics are getting "eaten up" by microorganisms?

 

(2) What's the approximate treatment capacity. i.e. How many m3 of 12000 ppm load can the unit handle, say, per 24 hrs? And for this what is the size of the treatment basin / tank that you have?

[breizh]

Hi ,

150-200 m3/day ; 2 tanks in serie ( 100 m3 /unit), rectangle shape , equipped with 1 blower each and distributors at the bottom of the tanks to distribute fine bubbles of air (network covering the entire bottom part of the tank , every 50 cm a distributor ( round membrane of elastomer with pin holes ). Yes it is a bio treatment ( bugs and air + sun) .

Effluent is mainly residue from our acetyl salicylic plant  .

Prior to Bio treatment The Ph is adjusted with Caustic soda 50% to 6 to 7 .

Hope this helps
Breizh

Edited by breizh, 29 April 2015 - 03:22 AM.

[Zauberberg]

Hey Pierre, you have a river of Aspirin there just for yourself

[breizh]

Hi Dejan ,

 

80mg/day to prevent heart attack it is said .

Edited by breizh, 29 April 2015 - 03:24 AM.

[Zauberberg]

Fully agree. If you start producing Ephedrine, let me know - I might tap in the pipeline.

[curious_cat]

Fully agree. If you start producing Ephedrine, let me know - I might tap in the pipeline.

 

He just calls it "Aspirin"