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mwolski

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chloride removal from R.O. wastewater
Apr 20^th, 2009, 11:53pm

Does anyone have any experience on removing sodium chloride and or calcium chloride from waste water? We are trying to get a permit for industrial waste water disposal. We are taking well water, making demineralized water with it, then we are left with a steady 8 gpm of concentrated effluent from the R.O. unit. We want to use an infiltration ditch to dispose of the effluent. The only hang up with the permitting agency is the chlorides. I've heard of possible electric plate technologies, but I looking for any possible solutions or vendor information. We need to get chlorides down below 250 ppm. I have arsenic taken care of with soil treatment. See below for water quality:

Metals by ICP/MS Expected Effluent (ug/l, calculated)
Aluminum ND
Antimony ND
Arsenic 37.8
Barium 263.2
Calcium 30963.1
Copper 4.2
Iron ND
Magnesium 33437.5
Manganese 329.4
Silicon 42800.0
Sodium 799156.3
Potassium 41462.5
Hardness as CaCO3 215000.0

Other
Chloride 354400
Fluoride 4200
Total Nitrate/Nitrite-N ND
Ortho Phosphate-P 8500
Sulfate 125100
Alkalinity 996400
Conductivity N/A
pH N/A
Total Organic Carbon 43100
Total Phosphorus 9700
Turbidity N/A

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grrun God Member Offline WaterandWastewa ter.Com is the best! Posts: 3526 Pekin, IL Gender: Company or Organization: Freelance Environmental Engine	Re: chloride removal from R.O. wastewater Reply #1 - Apr 21^st, 2009, 1:10pm You might consider evaporative techniques which could add to your demineralized water production. This could require some very corrosion resistant materials in contact with the brine. grrun
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thedude

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Re: chloride removal from R.O. wastewater
Reply #2 - Dec 20^th, 2011, 4:18am

Hi everyone,

We do have a similar chloride problem in our deminaralization plant as mwolski had stated. The effluent wastewater resulted from the regeneration of ion exchanger process contains a high chloride concentration of around 6000-7000 ppm. We are looking for a solution that we can remove chloride to 1500 ppm level.

Thanks.

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DrHenry God Member Offline Ride, boldly ride, The shade replied... Posts: 790 Raleigh, NC Company or Organization: CESTAB (see bio)	Re: chloride removal from R.O. wastewater Reply #3 - Dec 21^st, 2011, 12:33am As Grunn said, evaporation is the only practical/cost effective method currently for addressing chloride.
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Jeff Naumann

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Re: chloride removal from R.O. wastewater
Reply #4 - Dec 21^st, 2011, 7:26am

thedude wrote on Dec 20^th, 2011, 4:18am:

Hi everyone,

We do have a similar chloride problem in our deminaralization plant as mwolski had stated. The effluent wastewater resulted from the regeneration of ion exchanger process contains a high chloride concentration of around 6000-7000 ppm. We are looking for a solution that we can remove chloride to 1500 ppm level.

Thanks.

Depending upon the "rules" by which your discharge is governed, "dilution" with "low-chloride" water "could" help.

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thedude YaBB Newbies Offline I love Water and Wastewater.com Posts: 17 Gender: Company or Organization: sdfsdf	Re: chloride removal from R.O. wastewater Reply #5 - Dec 22^nd, 2011, 8:41am Unfortunately dilution is forbidden according to regulations Regards
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Dr. Rakesh Govind YaBB Newbies Offline I love Water and Wastewater.com Posts: 10 Cincinnati Gender: Company or Organization: PRD Tech, Inc.	Re: chloride removal from R.O. wastewater Reply #6 - Dec 29^th, 2011, 2:47pm We have developed a process that can recover water from the system and use a fraction of energy consumed by an evaporator system. Dr. Rakesh Govind PRD Tech, Inc. 1776 Mentor Avenue Cincinnati, OH 45212 Cell: (513) 673 3583 Email: rgovind837@aol.com
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Taoward Lee

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Re: chloride removal from R.O. wastewater
Reply #7 - Dec 30^th, 2011, 8:59pm

There are no simple ways to remove chlorides from water.

This is why all the experts suggest evaporation. Ultimately, I agree concentrating the chlorides to the smallest volume (hopefully dry) using evaporation is the only way to eliminate it.

mwolski chloride probem is very different than thedude's chloride issue and should NOT be considered similar.

For mwolski:
The chloride concentration of 354 mg/l (354400 ug/l, calculated) attempting to reduce it to less then 250 mg/l (ppm). This is a reduction of a bit more than 100 mg/l per 350 mg/l. This is less than 10 pound of chloride (16 lbs of NaCl per day). Still not easy.

For thedude:
The 6000-7000 ppm chloride coming from deionization requiring reduction to 1500 ppm. This is more than a 75% reduction on a much larger concentration. If the cation regeneration for the deionizer uses hydrochloric (muriatic) acid, a large amount of chlorides are introduced by the hydrochloric. If this is true, prevention is possible.

Taoward Lee

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celinaaniston86 YaBB Newbies Offline I love Water and Wastewater.com Posts: 5 Company or Organization: ca co.	Re: chloride removal from R.O. wastewater Reply #8 - Jan 11^th, 2012, 2:19am Chlorides can get into the ground water through effluent from wastewater treatment plants, industrial wastewater, run-offs from landfills & road de-icing salts. Chlorides in the water can be significantly increased through the increment of chlorine to disinfect drinking water.
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