We are promoting rainwater harvesting in Guatemala. Water analysis indicated that the harvested rainwater has a lower pH value than what the U.S. Environmental Protection Agency suggests. They say water pH value is a secondary drinking water standard and recommend a pH between 6.5 and 8.5 for drinking water.
The pH of the harvested rainwater in our area varies between 4 and 5.
Are there any negative effects on the human metabolism drinking water with low pH level? Can we slightly increase the pH level by any household water treatment methods?
Low pH is not that dangerous. Aerated soft drinks like cocacola and pepsi have pH even lower than 4. But it shall be a good idea to restore the pH to an acceptable level through simple and natural means and contact with alkaline rocks like limestone which should be easily possible because the harvested rain water is given a pretreatment and stored.
drinking acid rain? not a good idea. look at what it does to the metal parts of a car. no bueno. you can easily and cheaply increase it healthily treat that if its for a community. impound in a large pond. put fish and plants. use a limestone filter before water enters pond.
drinking acid rain? not a good idea. look at what it does to the metal parts of a car. no bueno. you can easily and cheaply increase it healthily treat that if its for a community. impound in a large pond. put fish and plants. use a limestone filter before water enters pond.
Water with low pH has adverse effect on skin and the lining inside. It can also pick up metals from pipes and storage tanks which have adverse effect on metabolic system. The increased risk of cancer in acidic medium is very important. It is advisable that pH of drinking water is raised to fall within the range recommended by US and WHO. Oxides of calcium and magnesium and soda ash are suitable for raising pH of water.
Bien entendu que nous pouvons augmenter le ph. Mais est ce nécessaire?
La nature nous fournit une eau potable qui a peut être des centaines d'années de formation. Cette eau contient des éléments que seule la nature peut nous apporter. Modifier un facteur de sa composition interférera automatiquement par un déséquilibre sur les autres facteurs. Car la nature à l'avantage sur le scientifique, c'est qu'elle pratique toutes ses actions par petites touches. L'homme ne sait que déséquilibrer ce que la nature fait
Hello of course that we can increase the ph. but is it necessary? Nature provides us with drinking water that may be hundreds of years of training. This water contains elements that only nature can bring us. Change a composition factor will interfere automatically by an imbalance on the other factors. Because the advantage on the scientific nature, is that she practices all his actions by small keys. The man knows that unbalance what nature does
Just to add something to health effects discussion.
There is plenty of research showing the link between pH and cancer. Cancer thrives in acidic environment, and doesn't survive in a normal, more alkaline environment. Cancer cells make body even more acidic as they produce lactic acid.
Actually, too much acidity is an underlying factor in many degenerative diseases -- diabetes, arthritis, fibromyalgia and more.
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The Water Network research team has consolidated an answer to the above question. Further input from members is welcome and appreciated.
What is pH in drinking water?
The pH level of your drinking water reflects how acidic it is. pH stands for “potential of hydrogen,” referring to the amount of hydrogen found in a substance (in this case, water). pH is measured on a scale that runs from 0 to 14. Seven is neutral, meaning there is a balance between acid and alkalinity. A measurement below 7 means acid is present and a measurement above 7 is basic (or alkaline).
What are the health effects of pH?
The U.S. Environmental Protection Agency (EPA) does not regulate the pH level in drinking water. It is classified as a secondary drinking water contaminant whose impact is considered aesthetic. However, the 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.
Acidic water can leach metals from pipes and fixtures, such as copper, lead and zinc. It can also damage metal pipes and cause aesthetic problems, such as a metallic or sour taste, laundry staining or blue-green stains in sinks and drains. Water with a low pH may contain metals in addition to the before-mentioned copper, lead and zinc.
Drinking water with a pH level above 8.5 indicates that a high level of alkalinity minerals are present. High alkalinity does not pose a health risk, but can cause aesthetic problems, such as an alkali taste to the water that makes coffee taste bitter; scale build-up in plumbing; and lowered efficiency of electric water heaters.
People have a higher tolerance for pH levels ( drinkable levels range from 4-11 with minimal gastrointestinal irritation), there are still concerns. pH higher than 11 and lower than 4 causes skin and eye irritation. pH bellow 2.5 causes irreversible skin damage and organ linings.
pH adjustment systems:
There are two primary types of system design for pH adjustments – continuous and batch.
Continuous flow
Diagram 1: Continuous flow system. Source: phadjustment. com
The tank is constantly full – the amount of influent entering it equal to the treated effluent exiting the tank.
The advantage of this system is that can handle relatively high flows. However, it is not certain that the effluent will always be in range.
Batch
Diagram 2: Batch adjustment system Source: phadjustment. com
The batch has a fixed water volume, which is discharged only after fulfilling the criteria.
The influent enters the tank anywhere convenient and exits due to gravity near the bottom, where the port is located.
The batch volume is treated in one cycle.
** The systems shown here are simplified.
pH adjusting methods:
Raising the pH
Lowering the pH
Neutralizing filters
Acid injections
MgO beads
CO2
Soda ash/ sodium hydroxide injections
Neutralizing filters
Neutralizing filters are used if drinking water is acidic.
The pH is increased by the addition of the neutralizing material.
It is important to highlight that the water hardness may increase. (Water hardness is the amount of dissolved calcium and magnesium in the water - dissolved bicarbonate minerals - calcium bicarbonate and magnesium bicarbonate.)
Neutralizing filters are point-of-entry devices.
Water with pH greater than 6 is treated with calcium carbonate ( limestone) and water with the pH below 6 is treated with the synthetic magnesium oxide.
Untreated water passes through a filter filled with either calcium carbonate or a synthetic magnesium oxide medium and the material dissolves in the water therefore raising the pH level.
The flow rate should not the greater than 2 l/s·m2. The bed should be deep enough to provide sufficient contact time.
The material in the neutralizing filter need refilling and regular backwaching.
If cartridge filters, that retain solids from passing through, are installed before the neutralizing filters, the neutralizing filters will last longer.
After the neutralizing filter a water softener can be added to regulate the water hardness.
The neutralizing filter may result in pressure loss, since the water passes through the finely ground neutralizing material.
The corrosion of the pressure tank and the well pump may occur since the neutralizing filters are installed after the pressure tank.
In case of a high flow rate, liquid injection systems are a better solution.
Magnesium oxide beads in combination
Prill MgO beads are used when the water pH needs to be rasied.
They should be used after reverse osmosis.
Osmosis is a spontaneous movement of the molecules in the solvent through a semi- permeable membrane. The molecules tend to “ go” to the in that direction that will equalize the concentrations of the two sides. Reverse osmosis is a process in which the particles move in the opposite direction than in natural osmosis. The contaminated fluid passes through the membrane and the suspended particles are separated from the liquid. For this process, pressure is needed – the hydrostatic pressure needs to be greater than the osmotic pressure.
Prilly Pure Water Beads raise and balance pH levels of the water to 8,7 without any chemicals.
The beads are made from magnesium oxide which is produced from naturally occurring salts of magnesium found in rich brine deposits located approximately 2, 500 feet below ground. The resulting magnesium oxide is ‘ prilled’ into small, hard pellets by a high temperature firing process which turns them into small ceramic-like pellets.
In addition to adjusting the pH, the beads lower the surface tension of water, remove toxins and pull out heavy metals from water.
Prilly Pure Water Beads last forever and never need to be replaced.
Injection systems:
I Soda ash/sodium hydroxide injection
Soda ash/ sodium hydroxide injections are used if the water is acidic.
When injected into a water system, soda ash (sodium carbonate) and sodium hydroxide raise the pH of water.
Injection systems are a point-of-entry system.
Soda ash or sodium hydroxide solution are injected in the water by a corrosion- resistant chemical feed pump.
The injections are installed before the pressure tank so that the tank ant plumbing systems are protected from corrosion.
Dual treatment is used if the water needs to be disinfected, in addition to being neutralized. A chlorine solution is added with the neutralizing chemical.
With the injection systems water with low pH can be effectively treated – as low as 4.
The chemical storage tanks need to be refilled occasionally.
II Acid injection
Acid injection is used for water with a high pH.
Water with a higher pH can have a soda- like taste that is eliminated with this treatment and the chlorination is improved.
Acid injection is a point-of- entry system.
Acid injection reduces pipe corrosion, since water with the pH above 9 corrodes brass, copper, zinc, aluminum and iron.
A solution of acetic acid is injected into water. Usually white vinegar is used, as it is the cheapest, but citric acid and alum are also an option, as well as more hazardous weak solutions of hydrochloric acid or sulfuric acid if the pH is above 11.
The chemicals need to be refilled occasionally, while wearing the protective goggles, gloves and clothing.
Carbon dioxide
Carbon dioxide is used to reduce pH in alkaline water.
Carbon dioxide, CO2, is a colorless and odorless gas. It is a chemical compound composed of a carbon atom covalently double bonded to two oxygen atoms.
It is used as a pretreatment and sulfuric acid is added in the second step. The main purpose of this secondary acidification is to reduce the bicarbonate content and avoid calcium carbonate precipitation.
Carbon dioxide does not corrode the pipes and the equipment.
It was gives better control of pH than sulfuric acid. It shows self- buffering when reaching neutral pH levels. The self-buffering enables precise end-point control eliminating the danger of lowering the pH too much.
It can be utilized via a completely automated system.
Documents on TWN about pH and drinking water standards:
You might want to doublecheck your water analyzing procedures.
Rainwater should have a pH of 5.6 to 5.8, simply due to the presence of carbonic acid (H2CO3) from the atmosphere.
If the ph is between 4-5 units, that is indicative of a problem. The rainwater may be contaminated. The uric acid levels in bird droppings is high; reaching pH levels of somewhere between 3 to 4.5 – quite acidic.
Rainwater should have relatively low buffering capacity so that it should not take much of any alkaline chemical to raise the pH. Soda ash is an inexpensive and relatively harmless chemical for this purpose.
The water should also be disinfected.
Before treating the water, you should investigate further to determine the source of the contamination.
The simple answer is the addition of calcite filters to raise the PH. These are available in backwash models, but they also make upflow models with no back wash needed. Calcite is a very inexpensive material and readily available.
In the USA there are many people living on Rainwater. It depends on the climate and the size of the tank. The tank costs can be inhibitive, but there are many choices.
I do not know where your info is coming from but the more pure the water, the better, regardless of P.H. Value! Rain Water is about as pure as it gets, but I'm also unaware of ANYPLACE on the Globe where you can count on Rain Water as your sole supplier without mass storage/storage tanks which are cost prohibitive if even available in remote areas.
Other Technologies you can successfully implement affordably along with your Rainwater Harvesting are: Solar Distillation Panels (can purify almost any kind of contaminated water, have been used to recycle Frac Water, also serve double duty & capture Rain Water), AWG = Atmospheric Water Generators, they capture & create pure water from the moisture in the air & are proven everywhere on the Globe, even in Deserts!
For more info or to begin a dialogue on this topic, please feel free to contact us;
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Potential adverse health reactions related to acidic water are related to the potential for high metal concentrations. This can be a major issue in older distribution systems where lead pipes and fittings may have been used, as plumbo solvency can cause harmful concentrations of lead in the water. Such low pH values may also strip silver nitrate ions form any household filters, reducing their effectiveness in removing bacteriological pathogens and reducing their effective life. High silver concentrations in water can have chronic negative health impacts, but I think this is unlikely to be an issue, as the doses would be low. Silver toxicity is readily identified in any case-it turns the skin and hair blue.
At the pH values of 4-5 the carbonate equilibrium will be shifted towards carbonic acid. However I would be concerned that you are getting such a high degree of acidification in the rain, which would indicate some form of atmospheric pollution. If you are in an urban environment you could be getting dry deposition of nitrous oxides (traffic fumes) or there may be a source of sulphur dioxide. Or there could be a build up of organics in your system, with the acid coming from microbial or algal sources.
I would suggest that you check the water for inorganic nitrogen before supply as nitrates can cause health problems-methemoglonemia. This is often associated with vitamin C micro nutrient deficiencies, and can be fatal to children, especially those fed with formula. You would need to check for both nitrates and nitrites-again the equilibrium of these species is pH dependent.
On the positive side you will get very little microbial activity at such low pH, so the water is likely carry low acute risks associated with bacterial and potentially viral pathogens.
In terms of increasing raising the pH, the simplest solution would be to increase retention time in your systems. Carbon dioxide will dissolve into the water, pushing the carbonate equilibrium towards the carbonate end of the spectrum, providing alkalinity and bringing the pH up towards the more normal range of 6.5 to 8.5. If this process is to slow you could try cascade aeration.
It is healthy to drink alkaline water than acidic water. When the pH of water being process for drinking is low, it is advisable to adjust the pH towards alkaline by adding base and run the household filter.
A lot of good answers here; I concur that drinking water with a pH below 6.5 is probably not the best. Low pH is also an attribute of distilled and reverse osmosis water, and these water sources are not considered harmful, however.
If the rainwater is purified with ozone, then the oxygen molecules that are released in that process can combine with some of the free hydrogen ions (pH is a measure of free hydrogen ions, a lower number means more are present) which makes more pure water. Another good way to buffer the low pH is to store the rain in a concrete tank rather than plastic or metal. Calcium or sodium bicarbonate are good buffers, as well.
Just plain aeration, that is - introducing a flow of air bubbles into the water like an aquarium, will also help.
It might be worthwhile to identify the element that is causing the acidity. It could be carbon (carbolic acid), nitrogen, (nitric acid), or sulfur (sulfuric or muriatic acid). An analysis would help.
EPA secondary standards for drinking water pertain to contaminants that are not considered health threatening but can have undesirable effects. See https://www.epa.gov/dwstandardsregulations/secondary-drinking-water-standards-guidance-nuisance-chemicals, which says that low pH can cause a bitter metallic taste and corrosion of metal water pipes and fixtures. Other sources show that many soft drinks have pH in the range of your collected rainwater, and the acidity of orange juice is even lower.
pH is an indicator of the acid or alkaline condition of water. the pH value is a good indicator of whether water is hard or soft. The pH of pure water is 7. 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. In general, water with a pH
While the ideal pH level of drinking water should be between 6-8.5, the human body maintains pH equilibrium on a constant basis and will not be affected by water consumption. For example, our stomachs have a naturally low pH level of 2 which is a beneficial acidity that helps us with food digestion.
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.
A neutralizing filter is used if drinking water is acidic (low pH). It is a simple treatment device that raises the pH of water by adding a neutralizing material. However, it should be noted that the neutralization process may increase water hardness
Soda ash/sodium hydroxide injection for low pH
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. Unlike neutralizing filters, they do not cause hardness problems in treated water.
Acid injection for low pH
Acid injection treats water with a high pH by lowering the pH of water to around 7, which eliminates the soda taste and can improve the effectiveness of chlorination
Diagram 1: Continuous flow system. 
Diagram 2: Batch adjustment system