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Recyle the Regenerated Water from DM Plant

07/18/2013 12:13 AM

Recyle the regenerated water from DM palnt.In our dm plant use HCL & NAOH for regeneration.for regeneration loses about 40-45 m^3 of water .so how can convert this waste water into fresh one(useful).please suggest.

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Guru
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#1

Re: Recyle the regenerated water from DM Plant

07/18/2013 3:28 AM

Reverse Osmosis would work as a technique, as would evaporation. The challenge is to do either economically with such a small volume.

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Guru
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#2

Re: Recyle the Regenerated Water from DM Plant

07/18/2013 11:26 AM

The water is similar to seawater once it has been mixed to produce a neutral pH effluent. Rather than recycle it for direct process use one needs to consider other uses for it, such as:

  • storage for fire-fighting purposes, or
  • for flushing toilets, or
  • process area wash-down and cleaning, or
  • as a substitute for fresh water in any once-through process cooling applications,

thereby reducing the volume of buy-in of fresh water for these jobs and the volumetric charges for effluent disposal, which can be a multiple of freshwater buy-in charges.

Local plant economics will dictate the correct way to go.

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Guru

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#3

Re: Recyle the Regenerated Water from DM Plant

07/18/2013 5:34 PM

Distill it.

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#4

Re: Recyle the Regenerated Water from DM Plant

07/19/2013 1:28 AM

Hi Dinesh

How frequent is your regeneration? As PWSlack suggests, it will be more economical to use it for miscellaneous purposes such as flushing, cooling etc. Unless you have a large volume or high frequency of regeneration, it is probably not worthwhile to build a RO system for it.

If you have waste heat in your plant which you can recover, distillation or evaporation could be a possibility.

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#5

Re: Recyle the Regenerated Water from DM Plant

07/19/2013 7:01 AM

Use RO and you may be able to recover 50% at least.

RO waste, you can utilize for flushing toilets.

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#6

Re: Recyle the Regenerated Water from DM Plant

07/19/2013 11:57 AM

Depending on the content of the effluent, you may be able to employ Phytoremediation methods (preferably by hydroponics in multi-step stages?) within a greenhouse to trap the moisture and condense on a cold source.

I'm not sure how to efficiently process the biomass. Perhaps the hyper-accumulation of any toxic metals/minerals are localized to only specific portions of the biomass and easily concentrated for permanent disposal or sold as a source for chemical processing. On the link below is an explanation of this process along with tables for specific plants for extracting specific hazardous minerals, etc...

http://en.wikipedia.org/wiki/Phytoremediation

http://en.wikipedia.org/wiki/Phytoremediation,_Hyperaccumulators

If you convert the biomass into an energy source via pyrolysis or some other method, you must be aware that burning the fuel without refinement will just put those nuisance elements back into the environment and perpetuate the need for extensive purification.

As an alternative, solar distillery may be an inexpensive method to concentrate any unwanted waste

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