In some cases waters have lower pH values. How can we control the pH value to permissible limit?
This treatment method is used if water is acidic (low pH). Soda ash (sodium carbonate) and sodium hydroxide raise the pH of water to near neutral when injected into a water system.
The cheapest option: to change the color of the indicator - for example, litmus paper.
You need a buffer to increase the pH by adding water softeners with alkaline-rich compounds (like limestone).
Consider. https://www.gaiam.com/blogs/discover/how-to-increase-the-alkalinity-of-your-water
https://sciencing.com/different-raise-ph-drinking-water-8541741.html
This treatment method is used if water is acidic (low pH). Soda ash (sodium carbonate) and sodium hydroxide raise the pH of water to near neutral when injected into a water system.
When pH of drinking water is lower than 7.0 it si controlled by filtration of calcium carbonate filters with longer HRT.
Regards
Vit
Soda ash (sodium carbonate) and sodium hydroxide raise the pH of water to near neutral when injected into a water system. If the water needs to be disinfected as well as neutralized, dual treatment is possible within the injection system by adding a chlorine solution (sodium hypochlorite) along with the neutralizing chemical.
Dear Saha,
If water content low pH values, pH adjustment can do using Soda ash (sodium carbonate) and sodium hydroxide for raise the pH of water to near neutral. Solution of acetic acid (white vinegar), Citric acid and alum can be used into high pH water but a chemical feed pump made from corrosion-resistant materials.
Yohan Mahagamage
Is the water soft or hard? And what is the alkalinity?
You need to consider the carbonate chemistry to determine the optimal solution.
Sodium hydroxide is a strong alkali and with this chemical you can easily overdose. If the water is soft or has low alkalinity use soda ash and carbon dioxide to raise the pH and increase alkalinity.
Running the water through limestone is a low cost solution however you have no control on the final pH.
Acid-alkaline balance - is the pH of human blood and other fluids in our body for medical reasons should range from 7.35 to 7.45. The average pH of the blood of a healthy person is 7.42. Therefore, drinking water must comply with these pH values.
Ways to regulate the pH with chemical reagents give negative consequences for the human body, so you need to look for other ways: biological and filtration through natural materials.
According to the regulations worldwide for the case of drinking water, the pH should be between 6.5-8.5; if it is lower than pH 6.5, sodium bicarbonate can be added and if it is greater than 8.5 citric acid can be added. All this with due control and automation.
I agree with Yoplac for your answer above. The pH of permissible drinking water should be between 6.5-8.5, if it is lower than 6.5 sodium bicarbonate can be present in water and greater than 8.5 citric acid can be present and added carbonate in water.
to keep drink water in neutral PH=0 it should be covered and isolated from air atmosphere contact.
Ammar Alzaerat: pH 0 is not neutral at all!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Regards
Vit
Sodium carbonate is the cheapest alternative to increasing the pH of slightly acidic drinking water. It is also safer to handle compared to NaOH.
EPA recommends that public water systems maintain pH levels of between 6.5 and 8.5, a good guide for individual well owners. Water with a low pH can be acidic, naturally soft and corrosive.
There are different types of pH control systems:
In-line pH control where a probe is inserted in the pipe through which the solution is flowing or in a tank holding the solution. The controller then adds chemicals directly to the solution via a connection into the pipe.
Recirculating pH control where the solution is pumped from a tank to a measurement system and then returned to the tank. The stream is filtered, measured by the probe and chemicals are injected in its return path. This method is more accurate because it tests water currently in circulation, which improves the accuracy of the reading, and has less potential for damage to sensitive probes.
Sources
https://cleanawater.com.au/information-centre/what-is-ph-control
We can control the pH of water by adding sodium carbonate or citric acids according to the nature of water.
The normal and safe pH range for drinking water is 6.5 to 8.5. pH of rain water is about 5.6. pH of corbonated drinks is about 3.5. Still prople enjoying the taste. The recommended range of pH is quite big, therefore there is no need to change pH.
Water may be tested for other dissolved constituents and the level is above the recommended level, should be treated before use
The normal pH range of drinking water is 6 - 8.5. The pH is mostly a result of natural geological conditions at the site and the type of minerals found in the local rock. The pH can also be affected by acid rain. Water with a pH value less than 7 is acidic and tends to be corrosive. Acidic water (low pH) can leach metals from plumbing systems, which can cause pipes to leak. Metals that leach from the pipes (lead from lead pipes or copper from copper pipes) may also cause health problems. Water with a value greater than 7 indicates alkalinity and tends to affect the taste of the water. Alkaline drinking water may take on a “soda” taste. Corrosion problems also can occur in plumbing.
The pH is the measurement that determines whether the liquid is acidic, base or neutral. Fluids with a pH of less than 7 are acidic and have a pH greater than 7 alkali or alkaline. PH 7 is neutral and is equal to pure water acidity at 25 ° C. The pH of any solution can be determined using a pH indicator.
Hello, you can use neutralizing filters, which increase pH values through the addition of neutralizing materials, can also be effective for raising the pH of drinking water. These filters typically contain calcium carbonate or similar substances, which dissolve as they interact with untreated water. The addition of these minerals increases drinking water pH values to appropriate ranges, although spikes in the level of water hardness may also occur.
To increase the pH level of water i. e., to make it basic, you must add some basic substances to the water like
You may add
1. baking soda
2.soft soap
3 ammonia
4.lye
5.milk of magnesia
6.bleach
There are many more substances that increase the pH level you may choose any……
Regards
Krishna
pH of less than 7 are acidic and have a pH greater than 7 alkali or alkaline. PH 7 is neutral and is equal to pure water acidity at 25 ° C.
For drinking water, the pH should be 6.5-8.5(According to WHO).
If water have lower pH value(i.e. acidic) then we can raise its pH value by using these methods:
1) Neutralizing Filters:
It simply adds neutralizing material to the acidic water when passed through it which increases its pH value. Mostly Calcium Carbonate or Synthetic Magnesium Oxide is used in the filter. Its main disadvantage is that it increases the hardness of water.
2)Soda ash Injection:
Soda ash solution is injected in water supply system. It doesn't increase the hardness of water as in previous method.
3) Acid Injection:
This is for decreasing the pH value of alkaline water. Mainly weak acid like Acetic acid, Citric acid are used. But dilute solution of HCl and sulphuric acid is used if it has pH greater than 11
Water treatment utilities avoid using strong acids such as HCl and H2SO4 as it is difficult to control the dose and it is easy to overdose. We tend to use carbon dioxide as a weak acid. It dissolves in the water to form carbonic acid.
Hello,
its a very good question, but its still general.
please can you specify or prvide more details...
Best regards.
Soda ash and sodium hydroxide is commonly used to raise the pH of water to neutral.
By using soda ash and sodium hydroxide it used to raise the pH of water to neutral (6.8-7.5).
Sodium carbonate and sodium hydroxide are costly chemicals in comparison to lime. If Total dissolved solids content is not the problem,then lime could be used.
Again if lime is used formation of sludge is big problem.(handling of sludge disposing of sludge de-watering )
if water is acidic (low pH). Soda ash (sodium carbonate) and sodium hydroxide raise the pH of water to near neutral when injected into a water system.
Sludge may form if water contains dissolved sulfate and this again could be used in acid soils. In absence of sulfate and to make water pH neutral or near neutral by lime water ,possibly no significant sludge may be produced.
Sodium carbonate or sodium hydroxide should be used to raise the pH value of water.
Low pH might result from industrial and agricultural effluents, will sodium carbonate and sodium hydroxide remove them?
Since low pH in water means that the water is acidic, it means that sodium carbonate or sodium hydroxide should be added to soar up the pH value
So true Dr. Nyakno jimmy George i agree with you for your answer" low pH in water means that the water is acidic, it means that sodium carbonate or sodium hydroxide should be added to soar up the pH value".
pH of drinking water depends on source of Drinking Water like Municipal authority / deep tubewell / pond . Then measure TDS/ Hardness / TSS / Heavy metals mainly which affects the pH , accodingly physico -chemical treatment .
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