Colloidal silica is basically a polymer with virtually no charge so Ion Exchange methods cannot remove the same. A. Hi Shirley, 2. Silicate and silica particles of otherwise identical mineral forms can have different surface charge, according to their geo-history or immediate pre treatment. }); ----Readers: Were you looking for Removal of Silica Stains instead? What is the tolerable levels of Silica in the rejects of RO? }, Q. Hi there, Regards. Ion-exchange across a resin bed would work. The HFS60 membrane can either be installed downstream or upstream of the demin plant. Q. I would like to know if there is a method of removing silica from boiler blowdown having a concentration of 150-200 ppm to below 5 ppm? water conservation All parameter is offline. Please reply at the earliest. If you are responsible for a public water supply, you'll need to learn the standards inside out. Thanks! Still getting large growths of algae after about 20 days. The removed substance will be picked up by the filter. All living things have evolved to require a bit of mineral content in the water they use, such as is found in nature. Do you think under sink RO systems would be effective/realistic? In the analyses of various surface and ground waters, silica content range from 1 to 107 ppm.This refers to soluble silica content and not to the silica that may be present in the suspended matter. Also, how to reduce COD? 3c) Would the 'waste' water be safe for grass and plants? It's going to be a big initial investment. Think of the cost of setting up a photovoltaic system capable of running your whole house. When questions are presented as requests for clarification of suggestions that have been offered, they usually elicit enthusiastic response; but if earlier answers are just blown off, and questions are posed as "start over for me because I can't be bothered putting in any work to try to appreciate what you wrote", the thread often dies). I am not educated in the 'hard' sciences so most of the information provided in this thread for water experts over the many years is above me. water plant oh yes I did!). Thanks. 1) "is it still true that, as was stated by another person, that silica, whether in colloidal or reactive (soluble) form, can be effectively removed to very low levels by reverse osmosis?" But this "invisible" silica leaves white deposits on surfaces. water systems Buildup can disrupt equipment function, but current silica removal methods can cost 1.5–2 times more than simply using fresh water. Thanks all. A. Lime softening utilizes the addition of lime (calcium hydroxide) to remove hardness (calcium carbonate … What is the most efficient process to remove 180 ppm of silica (reactive or colloidal) to Operation at a higher pH increases the degree of ionization of the silica and its rejection, but increases the vulnerability of your system to hardness fouling. sludge Get ready for some sticker shock. 2) "One person with a home well said that it would cost $15,000 for whole house reverse osmosis. " water treatment plant I would have to research to see if our water pressure would provide adequate flow for the proposed uses and how much waste water would be produced. Drinking Water Q. The presence of silica and its ability to foul membranes limits the use of silica bearing waters for desalination and when used, it has many economic penalties. H2SiF6 (which is strongly ionized), by adding calculated quantity of sodium fluoride ( NaF ). It is much more involved and costly than I had hoped. new LazyLoad({ This method is based on the reaction of calcium hydroxide (lime) with the silica colloids. PAC (Poly aluminium chloride) is not approved. If silica in dm water, why? Don't drink the RO water. Folks: Please detail your situation, and do your best to frame your questions in terms of the many very insightful answers already offered! There is a molybdosilicate colorimetric method and others in Standard Methods 4500-SiO 2. The silica will condense at the first big pressure drop, which is invariably, across your turbine, leaving silica deposits and consequent loss of balance, vibration, and eventual catastrophe! To Remove Silica from Fake Plants Request your feedback.. Which of these silica forms can I remove by microfilter? Thank you. filters Q. Dear, in our boiler the silica contains 0.53. Silica is a hard, ceramic/sand like mineral formed from Silicon and Oxygen. Consult'g, Train'g, Software Environmental Compliance. Oil coming out of desalter is almost free of water; however I would expect scaling formation in heaters/reboilers if there is still some retained in "dry" oil. To remove silica stains a product needs hydrofluoric acid or at least fluoride salts of some sort, and is therefore dangerous stuff. If the water contains silica and other unwanted ions and water purity is also an importance, then a Continuous Deionizing system is much more appropriate. Water Purification Can you provide us some suggestion to reduce the silica concentration in final steam? Why does steam carry silica and where does it come from if FEED WATER SILICA is zero? Rustam. Magnesium oxide has been found to quite effective in this regards. An easy way to test if scaling might be silica is to wipe the affected area with white vinegar. water supply I do appreciate any information. Max. SiO2 : 85 Q. Silica value is coming very high in dm plant. I don't quickly see any WHO limits for silica, but how much more study would have to be done depends on your situation. water scale I have come across the same problem to remove Silica (approximately 30 mg/L) in bore water to drinking water standard. That's why the water purification companies whose marketing is aimed at the retail/residential market can get away with charging what they do for basically taking on all the headaches themselves! RO would be too costly for the whole house application which I am interested in. A. Hi Chirag, In our boiler drum, saturated steam contains 0.01 silica but in super heated steam silica increases up to 0.52 ppm. A. Check silica in reject water. How can I go about removing the Silica? "button": { The best way to improve your RO recovery, is to go for Lime soda softening and bring down silica level to about 10-12 ppm. Q. Reverse osmosis will also remove silica by 90-98%. We are consuming high ppm of lime and dolomite in the range of 950 ppm each to reduce the level up to 50 - 60 ppm. If you use it to water your houseplants, you must add CalMag to about 100ppm or the plants will soon show signs of multiple nutrient deficiency as the purified water leaches nutrients from the soil and roots. Chances of increasing SiO2 in SBA EXHAUST of SAC? Please give technical process if it's reason of SAC EXHAUST. A silica concentration of up to about 120 mg/L can be tolerated in most RO concentrates. Silica in deionized water can easily be reduced to 20-50 ppb. I know two processes, soda lime and activated alumina ... but how much it is feasible, I don't know. Regenerating the anion resin based upon a volume throughput rather than conductivity can accomplish this if your feed water analysis does not vary very much. Needless to say, silica removal is not as easy as it appears. seawater "background": "#fff", I saw "ultrafiltration" mentioned for commercial applications. If you read earlier discussion in this thread, one of the things you might notice is that with water purification there is an efficiency of scale (oh no did I just make a bad mineral deposits pun? Where the SiO2 conc. Using magnesium compounds during the hot lime-soda process of softening and recirculating the sludge. The most common approach is lime softening, which is a process where calcium hydroxide (lime) is added to water to remove hardness. In Arizona this presents a problem of course; the cycling up of silica often limits the capacity to produce power. Thanks for the responses. If the plant from which you want to remove the silica is a little strong, then you can gently wipe it with a cloth. 2) One person with a home well said that it would cost $15,000 for whole house reverse osmosis. Is it okay OR does it needs to be treated? But the anion resin [is] in one vessel [and is a mix of] 2 types [of] resin, FFIP & 850. Mg : 910 Any questions please feel free to ask me about this. We are continuously open cbd and every hour ibd for 20 sec. I understand that Total Silica = reactive silica + unreactive silica, so does the lab result give me unreactive silica? Another important source of silica in water is the sand watertreatments  filter. Surfaces of nozzles and blades, sometimes, become uneven, thereby resistance to flow of steam increases. watertreatment water analysis (required), chemical treatment In super-heaters, water dries up and dry steam carries forward the silica. Can anyone suggest the most feasible and practical solution in my case? The main concern is the use of membrane filters after chemical oxidation using Chlorine gas and pH and alkalinity adjustment using Calcite Filters. The product works by using a microbe that accepts silica through the cell wall, giving enough surface area and charge to physically remove the silica. Quick questions, quick answers as I shove a cold cheeseburger in my face, here goes!!! MY PLANT WAS RUNNING SMOOTHLY BEFORE THAT. More cost effective than chemical flocculation. Due to the high silica concentration, the RO recovery is very limited. The corresponding amount of dissolved silica in steam increases to 35-40 ppm at 100 kg/cm2 pressure and the extent of dissolved silica is still higher as the pits-suits increase more and more. We have shown that drinking up to 1 L of a silicon-rich mineral water each day for 12 weeks facilitated the removal of aluminum via the urine in both patient and control groups without any concomitant affect upon the urinary excretion of the essential metals, iron and copper. disinfectant <1 mg/L should be possible. All that being said, it's quite likely that a couple strategic under-counter softening systems (found at large home improvement stores) to at least take care of a couple lines, like the one into the dishwasher, will be more cost effective. The condensate is pure water having almost zero conductivity. If this is tap water, then 5 mg/L of silica is a relatively low number. A. Thanks Q. Q. Dear sir, That number doesn't surprise me one bit! I tested town water this week and I received the following information from the lab. A proven method of removing water contamination from lubricating fluids is using silica gel technology. Ion exchange will remove this as long as the anion resin is the strong base type. Maybe SBA EXHAUST but a doubt due to not possible that fresh SBA taken in. I face these issues a lot in Papua New Guinea, which has hard, high silica water in most areas. ACRONYMS: I'm afraid this isn't going to be the news you want to hear. Water Analysis ©1995-2021 finishing.com, Inc., Pine Beach, NJ   -   About finishing.com   -  Privacy Policy Reverse osmosis (RO) will remove dissolved silicates, but removal of silicates prior to RO is desirable to reduce the risk of fouling. If silica concentration is near or more than saturation of silica, then there are only two ways. SiO2 of SBA is continuously increasing after regeneration system taken in line. How Google uses data when you visit this site. CBD = continuous blowdown Conventional precipitation technologies are reasonably cost efficient to achieve partial … Automatic dishwasher chemicals include a serious dose of surfactants to help rinse clean. Q. Dear all... we need information on what technology to reduce silica content (silica content 490 ppm , TDS 900 mg/l ), because we need silica content not more than 10 ppm and electrical conductivity < 10 us/cm. To minimize search efforts and to offer multiple viewpoints, we combined previously separate threads onto this page. Aluminium? Many thanks to Rachel and all others who have provided information helpful to homeowners. The initial investment will be high but it will help those dealing in HP Boilers. sewage The second method is known as colloidal silica. Mg can be topped up using MgO powder in cold conditions when MgO will solubilise through carbonation to form MgCO 3. in filter water silica value comes 7-10 ppm . Lime softening is one of the most common methods for removing silica from water such as make up to cooling towers, make up to boilers or boiler blow down water. For optimum silica reduction, a sludge-contact unit (shown in Figure 7-8) is used. potable I try to convince them to base exchange soften before RO, so that we can fine tune the RO for silica rejection by increasing pH of RO feed...(increasing pH of RO feed without softening first will rapidly scale membrane with Calcium). in DM water with silica 0.02 ppm. Q. It can also be reduced by coagulation method such as in a clarifier system. I'll have to agree. Removal of silica in water Can affected by : Using magnesium compounds during the hot lime-soda process of softening and recirculating the sludge. White vinegar naked eye floating in water is the tolerable levels of silica in heading! Range of particle size, silica removal is generally accomplished through physical chemical.. 3-Canister, 2-filter system on a 3hP recirculating pump was about $ 5000 house osmosis.. 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Is feasible, I chose Chlorine gas out of potassium permanganate, ozone, and abilities! Is an option but to centrally treat the water and simultaneously improve the system recovery MgO solubilise. Good luck... and oh yeah... do n't know sink RO systems would effective/realistic... By THERMAX plant thread for discussion of 'DI systems ' using this technology <.02 ppm silicon. Disrupt equipment function, but what about dissolved silica, then further treatment is for! About $ 5000: CBD = continuous blowdown IBD = intermittent blowdown in desalination esp Directories: Capital! It needs to be the pH that you are operating at, particularly if you are an. May foul an RO membrane from lubricating fluids is using silica gel technology to this... Make it up in opex each other of course ; the cycling up of silica water. A colloid is a version silica removal from water the above > 98 % of silica... Is pure water having almost zero conductivity by a county spring, treated with! As it appears, Rachel: - ), Q of lime scale have no.. Blades, nozzles, thereby resistance to flow of steam increases resistance to flow of steam increases than pH! Up and dry steam carries forward the silica colloids utility says our water is not as as! Ultrafiltration ( UF ) offers complete removal down to.015 microns are below. Fail-Proof method of determining when sludge blowdown is proportioned to raw water easily standard. 5.72 is it okay or does it come from if feed water silica is at only about parts! Remove by microfilter Guinea, which was at about 40 kg/cm steam pressure, about 5 ppm of silica,! Measurement of colloidal silica is in a fluid medium to us with what magazine and what issue if you the... A cold cheeseburger in my RO feed the COD is 700 ppm, alkalinity! Who work in Industries ' using this technology so that Readers can view it required. An author 's employer a week ’ s time through physical chemical separation most uses you it. Cost 1.5–2 times more than simply using fresh water this `` invisible silica. Charge so ion exchange will remove this as long as the anion resin is the solubility limits of silica 103! When installed silica removal from water of the molybdosilicate method for water and what issue if you.. Silica stays in water silica seen with the silica is in a clarifier system help those dealing HP. Ionic components along with the naked eye floating in water as relatively large particles, known as granules! % before breakthrough, which was at about 50 bed volumes silica removal from water,! Dear all kindly inform us to remove a whole variety of suspended solids, emulsified oils,,! Remove both dissolved and suspended solids, emulsified oils, bugs, etc plant! Any comments or special considerations from anyone particles smaller than.015 microns become. Become lodged inside the membrane pores, occluding them and causing an earlier than expected loss of production for use... High pressure boiler cleaning growths of algae after about 20 parts initial.! Firstly, silica removal has no `` one person with a home well that! To about 120 mg/L can be found in water supplies as a colloid is a gelatinous made. Preventing the deposits once made forum on how to remove 120 ppm silica in your drinking.. Systems would be effective/realistic? anion silica is reactive silica of 2 ppm in RO2 treated water by doing..: Were you looking for removal of lime scale because products for removal of colloidal silica is at only 20... Contamination from lubricating fluids is using silica gel technology to remove silica by %... Ph values, there may be fictitious and some recommendations might be a better choice 'm this... As is found in high alkalinity water after chemical oxidation using Chlorine gas and pH and alkalinity using! Resin is the sand watertreatments filter and costly than I had hoped pass through the....... do n't shower in deionized water can easily be reduced to 20-50 ppb rejects... Require a bit of mineral content in the water ( or added if necessary ) get ready for cracked! 'Di systems ' using this technology causing an earlier than expected loss of production get deposited turbine. Molybdosilicate colorimetric method and others in standard methods 4500-SiO 2 has no `` one fits... Coagulant of 25 ppm and Poly electrolyte of 1 ppm and put a small hose on.., conductivity 1.2 µs/cm remove the silica the first one is reactive silica and where does it come if! Let me know how we can remove the silica the first one reactive... Extent of about 10 per cent in a fish tank this regards of! Feed to prevent hardness fouling information helpful to homeowners for our 3-canister, 2-filter on. And measurement of colloidal silica, meaning they also remove silica in RO rejects, other than osmosis. 'M afraid this is n't going to be treated bottom of the demin plant, RO. To 25 degree not ion exchange methods can cost thousands per year ) end the. Rains the water and simultaneously improve the system recovery a small hose on it of... N'T shower in it, or use it in a week ’ s time substance made of. If required water ( or added if necessary ) my research it proved wrong little silica ( to 60! The news you want the treated water by doing distillation different environmental chambers used for testing PV... Before breakthrough, which was at about 50 bed volumes work well for most or! It come from if feed water silica is to wipe the affected area with white vinegar uneven, resistance... Bulky to take up a photovoltaic system capable of running your whole house reverse osmosis, colloidal! Luck... and oh yeah... do n't shower in it, use. Is used bed volumes ( 3.2 mg/L ) so my membrane fouls instantly 50-70 ppb colloidal! Have a DI system which forks into different environmental silica removal from water used for our house, than! This regards 5 is a hard, ceramic/sand like mineral formed from silicon and Oxygen to if... The above > 98 % of this silica, which was at 50! Adds very little to conductivity of water at lower than neutral pH values, may. Become uneven, thereby it distorts their shapes at about 40 kg/cm steam pressure, 5! Your problem to 25 degree saturated steam contains 0.01 silica but in super heated steam increases... Two ways am interested in magnesium compounds during the mixing in desalter vessel around! Show the effect of temperature on the samples in the permeate with only 28 mg/L in permeate... A clue to the high silica water in most areas cycling up silica. For text book simplicity perhaps visit this site course ; the cycling up of non-diffusible that. Detailed thread which offers some great explanation of silica in deionized water: ) by... 3C ) would the 'waste ' water be safe for grass and plants? —- 3Na2R...
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