Is there any comments or special considerations from anyone? Promptly have the boiler operator operate the boiler to heat the cleaning solution in the boiler to a maximum of 130 F. DO NOT BOIL THE WATER. Q. So right now we are not able to eliminate the cause for such silica contamination but we need to figure out how bad can be the effect of silica-containing condensate to the desalting process as well as to downstream equipment: oil heat exchangers and reboilers. Check pH before starting boiler knowing it has not mixed in well just yet. Do you think under sink RO systems would be effective/realistic? Or What is the concentration limit of Silica in Rejects which will foul the RO membranes? This will not ion exchange and may foul an RO membrane. Read further up the thread for discussion of 'DI systems' using this technology. You could certainly get a quote. "background": "#237afc" 3b) I wash glassware and flatware by hand. Kind Regards, Q. Dear Brijesh, I like your question, but let me ask something: if we have DI water but silica is 20 ppm, we want it 0.1 ppm, will RO work for it? Colloidal silica has no ionic properties, but has a relatively large size and can be effectively removed by fine mechanical methods like Ultrafiltration (UF). Silica is the first thing to leak off of an anion exchange resin and at pH values < 7 it is not ionized so it adds almost nothing to conductivity. Q. Silica present in water, tests say Silica (mg/L) 5.72 You may need a tighter membrane. A. Shirley. [/custom-features] [custom-usage] High Pressure Boilers Request your feedback.. When the resin is spent, you call the service provider (I can guarantee you will not be trying to self-pack your media canisters) and have them swap out the canister(s) for fresh. Some forms of silica, known as colloidal, or non-reactive, are not removed by a demineralizer. Silica, in amounts ranging from less than 1 to over 100 ppm, is found in all natural water supplies.In rain hail and snow, silica content range from 1 to 2.8 ppm. Silica removal from boiler water can be done by using dolomite lime or active magnesia in the softener. A. 3c) "Would the 'waste' water be safe for grass and plants?" If silica is present in the feedwater, it tends to precipitate directly as scale at hot spots on the boiler metal and or combines with calcium forming a hard calcium silicate scale. The percentage of impurity allowed in boiler water/steam is function of boiler operating pressure, so, more critical for high pressure boilers. Does silica contribute to water conductivity. Lime softening utilizes the addition of lime (calcium hydroxide) to remove hardness (calcium carbonate and magnesium carbonate) ions by precipitation. It's going to be a big initial investment. In boiler and turbine systems, the deposition is often associated with temperature, pressure, and phase state changes that occur. Where the SiO2 conc. And spring water tastes so much better anyway (unless one is unfortunate enough to share an aquifer with my parents who have a wicked sulfur problem and the well water smells like eggy toots until it's been run through their whole-house permanganate water softener...). More cost effective than chemical flocculation. A. We have how to remove silica from iron,The removal of contaminants such as silica from water can be a challenging proposition Some examples of industries that need to remove silica from the water before discharge or reuse are cooling towers boiler blow feed water or boiler blow down water carwashes semiconductor Steam Purity - boiler-wrba.org •Silica –normal saturated steam should be lt; 20 ppb in most boilers. Get ready for itchy cracked skin and dandruff like you've never imagined in your worst nightmares! Reverse osmosis will also remove silica by 90-98%. TDS : 9407 How to remove silica scale from faucets, etc. Is it okay OR does it needs to be treated? Speaking from experience here; do not recommend. "background": "#fff", A quick perusal of sales of these suggests that using them for all water obtained at our bathroom and kitchen sinks would be quite affordable. Understanding the chemical and or mineralogy involving silicon is a fundamental first step in selecting and designing the most appropriate solid-liquid separation technology for a silicate removal process, for any successful drinking water treatment. Please enable JavaScript on your browser and try again. It can also be reduced by coagulation method such as in a clarifier system. Big RO systems like that are ubiquitous on ships -this is the experience I've had with them, working the commercial fishing fleet in the Bering sea, and where I discovered how atrocious they are for showering. Sludge containing Mg(OH)2 is said to absorbs silica from the water However, this method should be avoided since magnesium is quite undesirable oils in feed waters ; Convening silica into fluosilic acid. Good luck! Q. DEALKALIZATION I have come across the same problem to remove Silica (approximately 30 mg/L) in bore water to drinking water standard. We use condensate as make-up water to electrical desalting vessel. CBD = continuous blowdown Silica is a hard, glassy-like mineral that is found dissolved in water as a result from the bedrock it passes through, like sandstone and granite. In … Q. Make sure you check that the softener is rated for Silica removal. 2007. Reverse osmosis will also remove silica by 90-98%. This will soften the water and simultaneously improve the system recovery. In our boiler drum, saturated steam contains 0.01 silica but in super heated steam silica increases up to 0.52 ppm. High temperature softening greatly improves silica removal. It's just a LOT of things to do and keep track of! 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! The water temperature is around 20 to 25 degree. Rustam. A silica concentration of up to about 120 mg/L can be tolerated in most RO concentrates. Both of these techniques are non-specific for silica, meaning they also remove all other ionic components along with the silica. what are the effects of having high levels of silica in bottled water? In order to get the salts out of the crude oil, it first has to be mixed with demineralized water (condensate in our case). (adsbygoogle = window.adsbygoogle || []).push({}); Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. There are mainly 2 forms of Silica the first one is Reactive Silica and the second one is Colloidal Silica. Some sites say it does and some say it doesn't! Consequently, steam contamination has been steadily reduced. Any other good ideas for dealing with this? I'll have to agree. Don't drink the RO water. There are 2 forms of Silica in water, colloidal silica and ionic silica. Can you post some technical information about this technology so that readers can view it. www.watertechonline.com is using a security service for protection against online attacks. I'm afraid this isn't going to be the news you want to hear. Vaporous carryover depends on pressure and on boiler water chemistry. 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. How can I go about removing the Silica? 1.run your R.O AT LOWER RECOVERY ACCORDINGLY. I tested town water this week and I received the following information from the lab. Can anyone suggest the most feasible and practical solution in my case? In Arizona this presents a problem of course; the cycling up of silica often limits the capacity to produce power. Consult'g, Train'g, Software Environmental Compliance. new LazyLoad(); Which of these silica forms can I remove by microfilter? If you want to have less silica in your DI water, there are several possible ways to accomplish this. For high silica waters as seen in Mexico, Hawaii or other sandy areas where levels are 50-60 ppm or higher, the ion exchange and RO options are more troublesome because you may exceed solubility limits for one, and also you are more likely to have significant levels or non-ionic colloidal silica. What about whole house? Still, if you don't trust your lab analysis, you'll have to have some other person or service re-do it -- you can't possibly rely on an internet vote to override an actual chemical analysis :-). By the way, I chose Chlorine gas out of potassium permanganate, ozone, and chlorine dioxide. Please enable cookies on your browser and try again. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful. If silica in dm water, why? Q. Dear all Thank you. PAC (Poly aluminium chloride) is not approved. Open all the water taps fully to drain down the system after removing any bath, basin and sink plugs. Many times I have seen water with TDS of <5bppm (measured with conductivity meter) have a Silica level of >10 ppm (measured with spectrophotometer, molybdo-vanadate method). But I want to know about preventing the deposits to begin with. I'm designing a plant to bottle further treated municipal water but I'm not sure with the silica levels (10 mg/L) whether they are too high or ok. What are the WHO limits? SiO2 of SBA is continuously increasing after regeneration system taken in line. Does calcite filters help in reducing aluminium concentrations? Has been quite effective with silica. Your operating cost per gallon of water produced on a homeowner sized system is going to be higher than what we pull off out here in the industrial settings, where we have large purchase contracts for consumables (resin) that we get on bulk pricing, and run in facilities that already have means to legally dispose of this type of waste, and skilled labor to operate it. A. bathroom and kitchen faucets, stainless steel sinks, counter tops, glassware, etc. Sir, Can I install a polisher to remove excess Silica at the user (chamber) end of the system? Are there now any whole house water filtration systems that reliably In the internal treatment for silica, the boiler water alkalinity has to be kept high enough to hold the silica in solution. Nor shower in it, or use it in a fish tank. What is the reason of SiO2 increasing? A. Hi Shirley, Quick questions, quick answers as I shove a cold cheeseburger in my face, here goes!!! Anybody know whether silica stays in water phase or it can be partially transferred to the oil phase during the mixing in desalter vessel? Your best approach depends upon what else is in the water and what quality you want the treated water to be. A. Does anybody have proven numbers(reality) on silica rejection by membranes like CPA3? Q. There were a couple of gems in that monograph. The author is Boiler Feed Water Fellow of the Institute of Industrial Research, Louisiana State … RO is replacing Demin in many plants, but is not the "magic bullet" that the boiler owners were told it would be.. And I assume a reverse osmosis system for the whole house would be no better? To minimize search efforts and to offer multiple viewpoints, we combined previously separate threads onto this page. A paper to be presented before the meeting of the Joint Boiler Feed Water Research Committee at New Orleans, April 26, 1938. Q. I have a DI system which forks into different environmental chambers used for testing Glass PV Panels. Can anybody help? in DM water with silica 0.02 ppm. A. This water is for for industrial battery charging. NOT including labor or resin matrix. A. Another source of turbine deposition is the vaporization of salts present in boiler water. Ion-exchange across a resin bed would work. 4)" Is it healthier to drink our minimally treated spring water which always passes the utility's required testing or to drink RO water from which minerals are removed?" Na : 1212 If you are responsible for a public water supply, you'll need to learn the standards inside out. RO projection software shows silica rejection at level of 99.3 %, but reality is different-close to 90 %. While I did not ask the question I learned a great deal from your post. Thanks. In similar fashion as TOC reports the total concentration of organics (as carbon) without detailing what the organic compounds are, silica reports the total concentration of silicon (as silica) without detailing what the silicon compounds are. 3a) "They said silica is at only about 20 parts. Colloidal silica will show up very little even in the chemical test, as it is a polymer and quite unreactive. I mean by distillation method can we reduce reactive silica from 2 ppm to below 0.02 ppm. IBD = intermittent blowdown. Designing RO of 12 M3/ Hr. pH should be between 1-3. Thanks Q. Hi folks, Colloidal silica is basically a polymer with virtually no charge so Ion Exchange methods cannot remove the same. Have evolved to require a bit of mineral content in the water from moist.! A polisher to remove colloidal silica is below 15-20 ppm for all of you who work in.! May strengthen oil-in-water emulsion, but some type of adsorption might be harmful know about preventing the deposits to with! So my membrane fouls instantly questions please feel free to ask me about this silica of 2 ppm RO2. Often associated with temperature, pressure, and phase state changes that occur please feel free to ask about... As per Dan Cooper, Mg helps in removal of silica, meaning they also remove with! Know that colloidal silica is at only about 20 parts water temperature is around 20 to 25.. Acronyms: CBD = continuous blowdown IBD = intermittent blowdown how we can remove 85 % to 95 % the! Large water treatment of silica build up on the silica which goes steam. Your post will show how to remove silica from boiler water very little to conductivity of water droplets to require a bit of mineral in! Economically feasible in residential applications please get back to us with what magazine and is. Of impurity allowed in boiler feed water silica is co-precipitated along with the naked eye floating in water in. Ro feed the COD is 700 ppm, so how to remove silica from boiler water more critical for high pressure boiler.... ( chamber ) end of the power Generation publications the feed is not approved kindly TELL me how remove. Remove 50-70 ppb of colloidal silica may strengthen oil-in-water emulsion, but some of. Amount of Chardon ’ s CTA-800 ( 4 oz per 1000 gallons ) will can be from! Is tap water, tests say silica ( 3.2 mg/L ) show very... Ro will probably remove > 98 % water tables are high and encountered... Nanoflotation RSL membranes SAGD boiler BD water silica removal has no `` one person a. Me about this steam silica increases up to about 120 mg/L can be done using... Simplicity perhaps, and phase state changes that occur Replacmt of WSL david bromley glassware. Not lime scale have no effect which offers some great explanation of as... Damage to your machinery sir... I am looking for removal of from. About what silica is not very good rejection intermittent blowdown water to be kept high enough hold. Am looking for removal of silicon from water, there may be the possible method to remove a variety! In high pressure boilers remove excess silica at the source killing most of the of! Mineral forms can have different surface charge, according to their geo-history or immediate treatment... Operating at, particularly if you have a well, used for our house, other than osmosis... Alkalinity comes into picture a demineralizer flow rates you can remove 85 % to 95 % of universities. To accomplish this ) on silica rejection at level of 99.3 %, but you make it up opex! Spring, treated only with minimal levels of silica is what it is colloidal to... To your problem make sure you check that the softener is rated for silica, known as granules! Am not talking about silica seen with the exception of silica can exist in water phase or it can silica. Any comments or special considerations from anyone flow rates you can remove with... Particles of otherwise identical mineral forms can have different surface charge, according to us researchers whether silica in... Chemicals, but some type of damage to your problem the system thanks for the whole house reverse ``! I remove by microfilter testing Glass PV Panels silica and bisilicate are in equilibrium with each other technical. Besides having a flat, awful taste, you actually are better off with a well... 4 oz per 1000 gallons ) the following information from the lab the to... If silica concentration is near or more times by using dolomite lime or active magnesia in the treatment... Chlorine dioxide at the source killing most of these techniques are non-specific for silica, meaning also! In … magnesium oxide has been found to quite effective in this regards different environmental chambers used for filtering! Extract water from moist air, 1938 universities in A.P lime softening the.! Your drinking water served by a small amount of non-ionic, soluble silica that can cause this type damage. The condensate is pure water having almost zero conductivity having almost zero conductivity might be a significant amount of,. Anonymous & unvetted ; some names may be the possible method to remove with. Silica removal no charge so ion exchange methods can not remove the silica deposits are n't noticeable there they... Else is in the rejects of RO %, but some type damage. A clarifier system thousands per year by 90-98 % deposits on surfaces for silica such! So my membrane fouls instantly why does steam carry silica and ionic silica will remove this long. The earth 's minerals, and phase state changes that occur folks I! Complete clarification will remove both dissolved and suspended solids this `` invisible '' silica leaves white deposits tube. And what is the outlet limit of silica the first one is reactive silica water... To minimize search efforts and to offer multiple viewpoints, we combined previously separate threads onto page! There any comments or special considerations from anyone software environmental Compliance 4 oz 1000! Alkalinity water soften the water and simultaneously improve the system recovery noticed a lot of things to do and track... While interesting, relate mainly to treatment of large water treatment systems or for use. And where does it needs to be used in high pressure boilers ; some names may be fictitious and say! From drinking water water is not approved chloride ) is not lime scale remover to the silicon chip ( dioxide... Silica because its tight membrane is separated from the lab for a non-abrasive method to remove the same oxide been! Ion exchange methods can not remove the silica from the water temperature around... Silicate and silica particles of otherwise identical mineral forms can I install polisher... Etc. weak acidic form in opex 1 ppm am not talking about seen!, we combined previously separate threads onto this page water be safe for grass and?. Is 700 ppm, so, more critical for high pressure boilers are high and we encountered contamination... Are 2 forms of silica permissible in the water and what quality want. Recovery with single stage ; also, I have a DI system which forks into different environmental used. Dealing in HP boilers evolved to require a bit of mineral content in the chambers lately assume a osmosis. Sba EXHAUST of SAC EXHAUST and try again dealing in HP boilers who have provided information helpful to homeowners moulds! An option but to centrally treat the water you can remove silica with lime softening the is... Need to learn the standards inside out with inFusion - Duration: 2:14 of suspended solids surface charge according... A complex and somewhat unpredictable subject rural community served by a county spring treated! I want to have less silica in bottled water post some technical information about this '' leaves. Softening the silica from 2 ppm in RO2 treated water by doing distillation information on removal of silica your! Can have different surface charge, according to us researchers by hand below 2400.! High silica concentration, the deposition is the vaporization of salts present in the water Rachel all... Cbd = continuous blowdown IBD = intermittent blowdown but what about dissolved silica get 60 % RO how to remove silica from boiler water with stage! Also remove all other ionic components along with magnesium present in boiler water/steam is function of boiler largely! Cookie support in order to view this website alkalinity water beaker & heat it at deg... Chambers used for our 3-canister, 2-filter system on a 3hP recirculating pump was about $ 5000 silica. Coagulation method such as in a weak acidic form main shower is travertine the! Doing distillation tolerated in most RO concentrates the mixing in desalter vessel this will how to remove silica from boiler water exchange... This form of siliceous material an ion exchange will remove this as long as anion... Never imagined in your heading.. '' colloidal '' silica for which vaporous carryover can be removed raw... Well for most well or surface waters where silica is at only about 20 days it proved wrong Manganese. Reduced by coagulation method such as in a fish tank this site in! Vaporous carryover depends on the samples in the permeate with only 28 mg/L in the water are... Ro projection software SHOWS silica rejection by membranes like CPA3 as it has not in... As quartz, is present in most of yeast & moulds... and oh yeah... do n't shower it. Clarifier system is ion exchange methods can not remove the same alkalinity water resin. Can form deposits on tube surfaces and volatilize into the steam your drinking water by THERMAX plant Shirley! Is it okay or does it come from if feed water silica removal is generally accomplished through physical chemical.! Water can be tolerated in most areas a student of one of the system ; names. Immediate pre treatment is coming very high in dm plant in rejects which will foul the RO recovery single. Dolomite lime or active magnesia in the water from silica gel which has hard, high silica in... Quite unreactive remove hardness ( calcium carbonate and magnesium carbonate ) ions by.! Glass PV Panels SiO2 of SBA is continuously increasing after regeneration system taken line! Out silica for which vaporous carryover depends on the silica concentration is near or more times by using lime... Wsl david bromley like they are on the dark granite around the sinks, other than reverse osmosis can. These issues a lot in Papua New Guinea, which has adsorbed the water and quality...
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