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Mineralization of purified drinking water
1.
© 2022, IRJET
| Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 2717 Mineralization of purified drinking water Ramsiya Banu T P Student, Department of Environmental Engineering, MCET, Desamangalam-679532, Kerala, India ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - Water purification is the process of removing undesirable substances from water. Various techniques and technologies are adopted for water purification such as reverse osmosis, sediment filtration, activated carbon filters, and UV technique. All these methods have proved to be very effective in removing TDS and disease causing pathogens. There are several purifiers of different brands who guarantee 99.99% purified water. But this is actually a pure marketing technique for which we humans have fallen prey. Along with complete removal of suspended solids, wastes and other TDS, natural minerals available in the water are also removed during the purification process. Natural constituents of water comprise calcium ion and magnesium ions basicallywhich are vital for diet supplement intake, metabolic activity and stay healthy. RO purification of water along with removal of micro contaminants increases the pH of water, makes it demineralized whose consumption on daily basis is not appreciable. Mineral rich resin beds can be incorporated in purifiers which can restore the lost orremovedwaterminerals before available to drink and also balance the pH. Hence mineralized water with sufficient minerals fit for drinking would be obtained which is vital for each and every human beings metabolic activity and healthy body. People will no longer have to consume waterless water indeed which our purifying brands are actually providing. Key Words: Mineralization, calcium ion, magnesium ion, RO, TDS, mineral rich resin bed, mineralized water 1. INTRODUCTION Drinking water is also known as potable water. It is the water that is safe for drinking and cook food. Water is an inevitable part of humanlife. Humanshouldconsumeatleast two to three litres of water daily for proper functioning of the body especially the metabolic activities. Not only food are regarded as source of nutrient but water also because it also contains necessary minerals in themlike calcium, magnesium etc. consumption of these minerals through water are vital for a human body. However these minerals are lost when they are subjected to purification process. The use of water purifiers is increasing day by day due to lack of availability of pure water. Nowadays water is getting contaminated from its sourceitselfduetothecarelessnessof human being. Pollution is a prime cause of water contamination. In order to get rid of the unwanted substances and microorganisms,peoplearerelyingonwater purifiers to get purified drinking water. The purifiers available in marketadoptseveral techniquesto make them free from contamination. RO or reverse osmosis is one such technique which is commoninall purifiers which uses a semi-permeable membrane to filter out all the contaminants. Along with the removal of unwanted substances, the vital minerals present in the water are also removed due to the tiny pore size of the membrane. As a result the water from the purifiers is mere clear liquid devoid of essential minerals. Human are consuming actually water less water from the purifiers which can just only quench the thirst but cannot providenecessarysupplements to the human body in taking them. Consumption of this kind of water creates several issues such as dehydration, lack of nutrients etc. Hence it is important to take necessary step as a remedy or to avoid such condition. Therefore purified water has to be mineralized to incorporate all the necessary minerals previously present in water before available for drinking. 1.1 Water purifiers Water purifiers are the devices which are used to filter and purify drinking water in order to make them free from impurities, contaminants and microorganisms. They adopt several techniques to purify the water which are RO or reverse osmosis, ultra-filtration and nano-filtration techniques. RO is a process used to purify water which employs semi permeable membrane of pore size ranging approximately 0.0001 micron. It removes almost all the dissolved salts, impurities and purifies water to an extent of 99%. Due to the very small pore size of the membraneeventhevitaldissolved minerals are being removed. The matter present in water greater than the pore size retains over the membrane whereas the water passes through the membrane. Nano-filtration is also a purification or filtration technique which adopts membranes with nano pore sizes for filtration. Pore size ranges from 1 to 10 nm, which is just larger than that of RO pore size. In nano-filtration water is actually being softened by retaining minerals such as Ca2+, Mg2+. Ultra-filtration is a techniquewherewaterandlowmolecular weight constituents present in water passes through the membrane. Whereas the particles greater than that of pore size retains over the membrane. The pore size of the membrane of ultra-filtration ranges 0.1 to 0.01 microns. International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 09 Issue: 06 | Jun 2022 www.irjet.net p-ISSN: 2395-0072
2.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 09 Issue: 06 | Jun 2022 www.irjet.net p-ISSN: 2395-0072 © 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 2718 Table -1: comparison of RO, UF and NF Reverse Osmosis Ultrafiltration Nano-filtration Uses electricity Does not use electricity Uses electricity Membrane based Membrane based Hollow fiber Pore dia= 0.0001 micron Pore dia=0.01 micron Pore dia=0.001 micron Minerals not retained Minerals are retained Minerals are retained 90% hardness of water removed Not ideal for hard water Removes up to 60% hardness of water A lot of water gets wasted No water is wasted Little water is wasted A conventional water purifier consists of the followingparts: A sediment pre filter, carbon pre filter, RO membrane and post carbon filter. Sediment pre filter acts like a sieve to remove large particles present in water to prevent clogging of RO membrane. Carbon filter is used to remove taste, odour and chlorine too. RO membrane removes rest of the constituents present in water including vital minerals present in water. It also removes 95% of the TDS. Post carbon filter is the last most component of the purifier which gives a final touch of purification to the water emerging out of the purifier. TDS or Total Dissolved Solids is the measure of the all dissolved constituents (organic and inorganic) present in water. It is measured usingaTDSmeter.WhenTDSincreases, the taste of water began to change and it becomes unfit for use. The acceptable TDS ranges are given below. Table -2: Quality of water based on TDS level TDS Level in parts per million(ppm) Palatability Quotient Between 50-150 Excellent for drinking 150-250 Good 250-300 Fair 300-500 acceptable Above 500 Unacceptable Not all drinking water needs RO process for purification.The purifier and purification technique should be selected based on the TDS of the drinking water. Table -3: Types of purifier process based on TDS level TDS Level Type of water purifier TDS < 300 UF +UV 900 >TDS > 300 NF + UV TDS >900 RO 2. METHODOLOGY Since RO process along with the removal of contaminants and pathogens removes the vital mineral constituents of the drinking water, demineralization of the water occurs. Demineralization refers to the process of removing mineral contents in water. Water naturally contains dissolved mineral. These minerals are being removed along with the contaminants when the water is passed through RO membrane. Consumption of demineralized water just quenches the thirst, but is not capable to provide the sufficient minerals and hydration to the body. RO purified water is waterless water. Health experts have reported that the longer you drink demineralized waters, the more you are at risk of developing multiple mineral deficiencies and placing your body into an acidic state. The RO water turns out be acidic on purification. Acidic water is not favourable for human consumption. Human have to consume water of pH ranging 6.5 to 8.5. Hence in order to overcome the demineralization and acidic problem, the RO purified water could be passed through selective ion membranes of Ca2+ and Mg2+ in ordertorestore the calcium and magnesium levels back to the drinking water to restore them to make the water mineralized. When the minerals are incorporated to the water the pH of the water turns slight alkaline which is desirable. Hencepassing of water at the final stage at end of all process in the purifier helps to mineralize the water. Figure given below is the flow diagram of the proposed water purifier which is capable to mineralize the demineralized purified drinking water.
3.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 09 Issue: 06 | Jun 2022 www.irjet.net p-ISSN: 2395-0072 © 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 2719 Fig -1: Flow diagram Following steps were carried out. 1. Water sample collection 2. Test for pH 3. TDS evaluation 4. Test for minerals Water samples were collected from two different sources. And the sample sources are well and bore well. Most of the bore well water possesses hardness. The water sample collected from bore well did not possess much hardness. Test for pH are carried out at two stages: before purification and after purification. pH wastestedusingpHmeter.Test for pH is also carried after purification. It is carried outwithand without proposed membranes. Test without membrane is carried out to check the presence of Ca and Mg in the purified water to ensure that the minerals are lost during purification. Test for pH after purification is done to prove that the lost minerals can be incorporated into the purified demineralized water if the water is passed through Ca and Mg membranes. TDS of the samples were valuated using TDS meter .TDS evaluation was done before and after purification. TDS evaluation is a mandatory step to determine the loss of minerals. TDS of our tap water should be checked prior to make decision regarding purchase of a waterpurifier.TDSof our tap water decides which purification processisrequired for the purifier. Test for minerals like Ca2+ and Mg2+ were carried out at laboratory. Test for minerals were alsocarriedattwostages, before and after purification. Test for minerals before purification was carried out to detect the presence of natural minerals present in water. Meanwhile test after purification without membranes are carried out to point out the loss of vital minerals from drinking water due to adaption of purificationprocesseslike reverse osmosis which is not needed for all drinking water. In the test for calcium ions, two ml of watersampleistreated with aqueous sodium hydroxide solution. If calcium ionsare present a white precipitate would be formed. Add excess aqueous sodium hydroxide solution. If there is no change in the precipitate formed it indicates the presence of calcium otherwise not. To another two ml of the sample solution add aqueous ammonia solution. If it exhibits no change, it indicates the presence of calcium ions. In the test of magnesium ions, to few ml of the sample solution add few drops of ammonium hydroxide solution. If white precipitate is formed it indicates the presence of magnesium ions. In order to confirm ammonium carbonate solution is added to few ml of the sample solutions. If white precipitate is formed slowly presence of magnesium ions is confirmed. 3. RESULTS AND DISCUSSION Various laboratory tests are carried out on different water samples and were repeated before and after purification to understand the variation in parameters like TDS, pH, presence of Ca2+ ions and Mg2+ ions. The results for various tests are: 3.1 Test for pH The below results were obtained when test for pH is carried out on various water samples. It is very clear that purification process makes water acidic which is not good for human health. Table -3: PH results Before purification Sample 1 7.5 Sample 2 5.5 After purification without membranes Sample 1 5.5 Sample 2 4.5 After purification with membranes Sample 1 7.5 Sample 2 7 4.2 Test of TDS evaluation From the below test results it is clear that vital minerals are lost during purification process. And these minerals are incorporated back into thewaterafterinstallationof mineral membranes in the purifier. Feed Water SEDIMENT FILTER PRE CARBON FILTER RO MEMBRANE UV CHAMBER Ca & Mg MEMBRANE Purified mineralized water
4.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 09 Issue: 06 | Jun 2022 www.irjet.net p-ISSN: 2395-0072 © 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 2720 Table -4: TDS results Before purification Sample 1 250 Sample 2 650 After purification without membranes Sample 1 200 Sample 2 450 After purification with membranes Sample 1 Sample 1 Sample 2 Sample 2 4.3 Test for Ca and Mg ions In the case of test performed for presence of Ca ion, the result before purification is as: Sample 1: presence of Ca shown Sample 2: presence of Ca shown In the case of purification without membranes, the results were: Sample 1: absence of Ca ion Sample 2: absence of Ca ion When the test was carried after purification with membranes the results were as: Sample 1: presence of Ca ion Sample 2: presence of Ca ion In the case of test performed for presence of Mg ion, the result before purification is as: Sample 1: presence of Mg shown Sample 2: presence of Mg shown In the case of purification without membranes, the results were: Sample 1: absence of Mg ion Sample 2: absence of Mg ion When the test was carried after purification with membranes the results were as: Sample 1: presence of Mg ion Sample 2: presence of Mg ion From the above tests it is easy to conclude that all the necessary vital minerals like Ca and Mg are being removed during the purification process in purifiers especially when reverse osmosis process is adopted. Thelostmineralscanbe incorporated when the demineralized purified water is passed through Ca and Mg membranes. The water passing through these membranes will absorb the minerals which help to restore the lost minerals. 4. CONCLUSION Water purifiers have become a vital part in our daily life. Over dependence on purifiers is mainly due to the over contamination of our water sources by various means especially due to human activities. In order to make the water fit for drinking, it has to be purified. Water purifiers available in markets employ several methods to purify water. Reverse osmosis process is a common method adopted to eliminate contaminants and impurities. It has an efficiency of 90%. Other techniques used for purificationare nano-filtration andultra-filtrationtechniquealongwithultra violet radiation disinfection. But along with removal of contaminants and impurities, necessary mineralspresentinwateralsogeteliminated. This is due to the tiny pore size of the membranes used for RO technique. Due to the removal of vital minerals, we obtain demineralized water as an output of purifier. This is undesirable because demineralized water has no benefit on health and at the same time causes dehydration issues. In order to overcome this obstacle, the purifier can be installed with ion membranes that can incorporate lost calcium and magnesium ions to the water so that the output of purifier would be alkaline mineralized water which not only quenches the thirst but also provide sufficientminerals and hydration to human body. REFERENCES [1] Roohi Rawat, A.R Siddiqui (2019) Assessment of physiochemical characteristicsofdrinking waterquality, The oriental Anthropologist, 19(1) 121-135, 2019 [2] 2. Garud R M, Kore S.V, Kore V.S, Kulkarni G.S(2011) A short review on process and applications of reverse osmosis, Universal journal of environmental research and technology [3] 3. Pallabi Pramanik, Shaswati Das, Arghya Adhikary, Chirasree Roy and Annirban Battacharyya (2020) ,Design and implementation of water purification system based on deep ultraviolet light emitting diodes , Journal of water and health [4] 4. Subhrajytsana Aital and Sreeramana Aithal(2018) , Concept of Ideal Water Purifier System to Produce Potable Water and its Realization Opportunities using Nanotechnology , International Journal of Applied Engineering and Management Letters (IJAEML), ISSN: Applied2018, Vol. 2, No. 2, July [5] 5. Kah peng Lee, Tom Arnot, Davide Mattia(2015), A review of reverse osmosis membrane materials for desalination,Journal of membrane science
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