Limits of salinity ,chloride and conductivity for biological treatment

Dear friends,

I have a treatment plant of wastewater for a fish Canning industry with a concentration of chlorure (Chlorine) of 15000 mg/l and a conductivity of 22000 uS/cm.

Is there any impact on the biological treatment for this type of wastewater?

What's the limits of chlorure, salinity and conductivity for the biological treatment?

and if There is any impact, which plant technology should I chose?

Thank you!

Taxonomy

• Chlorine Dioxide
• Industrial Wastewater Treatment
• Industrial Water Treatment
• Chlorination
• Industrial Water Treatment
• Fish Processing

4 Answers

1. Hello,Mr.IHIA

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2. Both experts- SR and PN have given their views correctly.

    

   For surges you need to have an Equalising Collection tank at Pre process stage with Physical Filteration and releasing any vapours Etc..

    

   Ideally when remediation is nearly done, have a Phyto remediation with cayhna indica multi coloured flowers - cream, maroon, orange yellow to up grade aesthetics

    

   Having creepers and climbers on the others would give natural cooling of the ambience and will not lokk too industrialised.

    

   Well wishes.

   Prof Ajit Seshadri. 

3. If salinity is reasonably consistent and stable then you will select for a halotolerant bacterial population which will deliver the required treatment and you can use a standard wastewater treatment process (just protect from corrosion and size your aeration correctly). However, as Sean Roop says, if your conductivity and salinity swings wildly, you will not get good treatment.

   I suggest you check your figures though. I assume you mean chloride and not chlorine? I would have expected that a chloride of 15,000 mg/l (almost seawater) should give you a conductivity of nearer 50,000 uS/cm.

   1 Comment

   1. right Peter, most probably is NaCl sludge concentration

4. You can run a high salinity (salt water), brackish water or fresh water AS biological treatment.  You run into problems with float and cell losing when you swing salinity.  The name of the game is consistent when evaluating the biological environment.  Not having a handle on these swings with enough EQ capacity.  Surge as needed on these tanks to maintain hydraulic loading, organic loading and yes, in your case, salinity.  If you can do this, then you should be fine.

   1 Comment

   1. If your salinity is relatively stable it’s possible to select an adapted biomass.

      The problem can be in biological sludge sedimentation because salinity reduces the settling velocity and the halophylic bacteria doesn’t form good flocks. To use flotation instead sedimentation can solve this problem.