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nyioh YaBB Newbies Offline I love Water and Wastewater.com Posts: 16 Gender: Company or Organization: Aident Corporation Sdn Bhd	Will Activated Carbon Change the water pH Mar 01^st, 2012, 9:48pm Hello, Would like to seek for advice & opinion on below challenge. For existing plant process the water pH change from 7 to 9 - 10 after go through the activated carbon filter. still wonder why this happen. look forward for all the precious help. Regards Nyioh
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grrun God Member Offline WaterandWastewa ter.Com is the best! Posts: 3525 Pekin, IL Gender: Company or Organization: Freelance Environmental Engine	Re: Will Activated Carbon Change the water pH Reply #1 - Mar 2^nd, 2012, 2:58pm It seems to me that you should consider the composition of the water before and after passing through the activated carbon. Absorption of slightly acidic compounds by the activated carbon may be the reason for the increase in pH. grrun
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nyioh

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Re: Will Activated Carbon Change the water pH
Reply #2 - Mar 2^nd, 2012, 11:18pm

HI Grrun,

Thousand thanks for the precious information.

Just to make a little detail.

For this existing plant it only involve evaporation - condensation - cooling - & AC filter process only.

Yes, we are checking on the water composition before the AC filter.

May be what curious me was is that possible the Activated Carbon (AC) was contaminated befor installation. ( because recently just change the carbon, and this happen).

Deeply appreciated for all the information.

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grrun God Member Offline WaterandWastewa ter.Com is the best! Posts: 3525 Pekin, IL Gender: Company or Organization: Freelance Environmental Engine	Re: Will Activated Carbon Change the water pH Reply #3 - Mar 3^rd, 2012, 12:51pm Active Carbon may also be able to identify the type of activated carbon that you have for your system. Some activated carbons may be impregnated with other substances to react with some constituents that are not readily absorbable by the carbon. grrun
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commissioning guy Senior Member Offline I love Water and Wastewater.com Posts: 292 Company or Organization: SWS	Re: Will Activated Carbon Change the water pH Reply #4 - Mar 3^rd, 2012, 3:29pm There are numerous types of activated carbon on the market and yes depending on which one you have there may be a pH shift.
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nyioh

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Re: Will Activated Carbon Change the water pH
Reply #5 - Mar 4^th, 2012, 7:50pm

Thanks Grrun & Commissioning Guy,

Yup, at the moment will work on the suitable carbon.

And after back wash for some time, pH seem to be reduce to acceptable level.

Will be more alert on next service.

Thanks for all the valuable & precious idea.

P/S will post on another topic regarding evaporation & COD concern.

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Re: Will Activated Carbon Change the water pH
Reply #6 - Mar 5^th, 2012, 12:01pm

Some types of activated carbon that are manufactured or regenerated in a specific way will adsorb more H+ (protons) then others, causing the pH to go up. Depending upon the water composition (TDS, buffercapacity), this may take quite some bed volumes (worst case: some hundreds of BV) before this effect is gone.

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activecarbon Senior Member Offline Laurence D'Alberti is the best! Posts: 396 Gender: Company or Organization: United Manufacturing Intl.2000	Re: Will Activated Carbon Change the water pH Reply #7 - Mar 7^th, 2012, 12:44pm There is a pH rise when passing water through an activated carbon filter filled with regular coal based activated carbon. The exact reason for this I am not sure of but the solution is to use acid washed activated carbon which can be obtained for a little more in price than the regular activated carbon.
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nyioh YaBB Newbies Offline I love Water and Wastewater.com Posts: 16 Gender: Company or Organization: Aident Corporation Sdn Bhd	Re: Will Activated Carbon Change the water pH Reply #8 - Apr 12^th, 2012, 3:24am Hi All, Thousand thanks for all valuable idea. Finally after few week of back wash, the pH seem to be normal. Need to be more careful for next maintenance, it will be safe if can get the carbon specification. Thanks Regards Nyioh
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