Thanks very much for all your ...

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Thanks very much for all your answers!

I will try to answer all of you:

We are dealing with industrial waste water, the aim, is to reuse the water, but more important reduce the volume of water into environment (this is an obligation!).

It is needed to treat 4800 m3/d (200 m3/h).

In this moment the CAPEX it is not important, the factory really need to solve the problem. ZLD will be on the table to discuss!

The WWTP is working very well, follow the parameters: the BOD is less than 20 mg/l this is why we can’t reduce more the COD with the biological process, Nitrogen 0,90 mg/l, phosphorous 0,3 mg/l; conductivity 3800 us/cm.

Of course the first option is to try to reduce as much as possible the organic matter before RO. But we have already the WWTP optimized, and with the best available technologies (MBR, with membranes of 0.02 µm). Activated Carbon would be an option but we have afraid for our experience that will be “clogging” often.

This project will be quite similar to a landfill leachate, where RO is used, and we think the design could be similar! I will contact Mr Pat, for the Rochem membranes, it seems a good way. Also I would like to explore more the Mr Derya option of AFM medium.

2 Comments

Hi Catia

It is not a bad idea to use CF to reduce the organics but must be careful with the type of carbon that you use, also the system (tank, diffusers, piping etc.) must be designed to be sanitized with steam, just like in the dairy industry, also the Carbon media must be replaced more frequent that usual, hard to tell now because it depends on the maintenance that the operators give to the system, best case scenario would be 12-18 months.

I think your best bet is to use a membrane that can be sanitized with hot water such as the Hydracore 70 manufactured by Hydranautics, I’ve used those membranes to concentrate cheese whey and although they need to be cleaned every day, they do a pretty good job reducing COD from about 100,000 to less than 2000 with a concentration factor of x3, which is a 98+ % COD removal.

However, I will recommend you to run a pilot, especially with the type of water that you are dealing with.

I hope this help you, if you are used to a different brand of membranes, I am sure that DOW will have an equivalent to the Hydranuatics Hydracore.

If you need more information, I will be happy to share it with you.

Good Luck

Luis Inarejo

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