how to remove silica from boiler water

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. We use condensate as make-up water to electrical desalting vessel. A. The service requires full cookie support in order to view this website. You could add a tank of mixed bed resin after your DI system, or you will need to regenerate the anion resin before the water reaches a conductivity set point. Q. Silica present in water, tests say Silica (mg/L) 5.72 Any other solutions? 5 mg/L of silica in the permeate with only 28 mg/L in the feed is not very good rejection. This water is for for industrial battery charging. Due to the high silica concentration, the RO recovery is very limited. I am trying to learn more information on removal of silicon from water. All living things have evolved to require a bit of mineral content in the water they use, such as is found in nature. You will be redirected once the validation is complete. We developed a product to remove silica from geothermal brine. Q. Some sites say it does and some say it doesn't! A. Hi Shirley, Close the taps when the water flow ceases. A canister return/regenerate contract can cost thousands per year. Please enable cookies on your browser and try again. but adds complexity for water treatment design. Two basic ways to regulate corrosion in water, are All Volatile … new LazyLoad(); Or What is the concentration limit of Silica in Rejects which will foul the RO membranes? They said silica is at only about 20 parts. Steam Purity - boiler-wrba.org •Silica –normal saturated steam should be lt; 20 ppb in most boilers. Reactive silica 88g/m3 as SiO2 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. How To Remove Silica From Iron. 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). 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 RO is replacing Demin in many plants, but is not the "magic bullet" that the boiler owners were told it would be.. what are the effects of having high levels of silica in bottled water? Thanks all. Good luck! 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 :-). If silica in dm water, why? To minimize search efforts and to offer multiple viewpoints, we combined previously separate threads onto this page. 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. (If you have a combi boiler without a tank you may have to remove the heat exchanger and descale it directly.) www.watertechonline.com is using a security service for protection against online attacks. Any other good ideas for dealing with this? Can you provide us some suggestion to reduce the silica concentration in final steam? In lime softening the silica is co-precipitated along with magnesium present in the water (or added if necessary). In other words, what is the solubility limits of Silica in RO rejects? Oxidised silicon atoms can and do exist in many different chemical and mineral forms, hence a process that works at one location may not be successful in another. oh yes I did!). 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! Nor shower in it, or use it in a fish tank. Q. I want to know whether we can reduce reactive silica of 2 ppm in RO2 treated water by doing distillation. 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. silica does not readily form chains more than 6 silica atoms long. It can remove 85% to 95% of the silica from drinking water. Thanks for the entertainment included in your postings, Rachel :-), Q. Q. The chemistry of silica is a complex and somewhat unpredictable subject. I am a crude stabilization unit process engineer. The percentage of impurity allowed in boiler water/steam is function of boiler operating pressure, so, more critical for high pressure boilers. Quick questions, quick answers as I shove a cold cheeseburger in my face, here goes!!! DEALKALIZATION "background": "#237afc" A discussion started in Try electrocoagulation. Check silica in reject water. In our boiler drum, saturated steam contains 0.01 silica but in super heated steam silica increases up to 0.52 ppm. As per Dan Cooper, Mg helps in removal of silica; but in my research it proved wrong. A. 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? 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. This characteristic of silicon is beneficial to the silicon chip! What is the most efficient process to remove 180 ppm of silica (reactive or colloidal) to Normally silica is present in a weak acidic form. Can you post some technical information about this technology so that readers can view it. A bit bulky to take up a lot of under counters space but realistic if required. How Google uses data when you visit this site. Reverse osmosis will remove both dissolved and suspended solids. A. Nanoflotation RSL membranes SAGD Boiler BD water Silica removal Replacmt of WSL david bromley. It's just a LOT of things to do and keep track of! A. 2) One person with a home well said that it would cost $15,000 for whole house reverse osmosis. I know that colloidal silica may strengthen oil-in-water emulsion, but what about dissolved silica? Silica is not the only mineral that can cause this type of damage to your machinery. This is not lime scale because products for removal of lime scale have no effect. Here are additional questions and comments that I have for my situation: Both of these techniques are non-specific for silica, meaning they also remove all other ionic components along with the silica. Thank you. level of 5 ppm - is this by IE/RO/SBA or by EDI? pH should be between 1-3. Q. Dear sir, Can anyone explain why did this happen and is there anything where alkalinity comes into picture? If treatment required, please suggest treatment. What is the tolerable levels of Silica in the rejects of RO? 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. In order to get the salts out of the crude oil, it first has to be mixed with demineralized water (condensate in our case). Thanks! 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! Please let me know how we can remove the silica from the water and what is the outlet limit of silica as per WHO. 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. USE SILICA REMOVAL SPECIAL TECHNIQUES. [last name deleted for privacy by Editor], -- this entry appended to this thread by editor in lieu of spawning a duplicative thread, Thirumalai Chemicals Ltd - Ranipet, Tamilnadu, India, Boiler Water Treatment Chemist - Brisbane QLD Australia, ©1995-2021 finishing.com, Inc., Pine Beach, NJ, How Google uses data when you visit this site. The most common approach is lime softening , which is a process where calcium hydroxide (lime) is added to water to remove hardness. Check pH before starting boiler knowing it has not mixed in well just yet. A. Hello Lucky. In some cases for very large flow rates you can remove silica with lime softening techniques. Kindly inform us to remove silica in high alkalinity water. 2. Sir, Because of the range of particle size, silica removal has no "one size fits all" solution. Water Treatment of Silica can be quite interesting as many people generalize for text book simplicity perhaps. Due to heavy rains the water tables are high and we encountered algae contamination. water consists the silica which goes to steam drum in which steam and water separation takes place . 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. High temperature softening greatly improves silica removal. Thank you. All parameter is offline. Q. I am a student of one of the universities in A.P. What about whole house? PROBLEM AROSE JUST A WEEK AGO. Another source of turbine deposition is the vaporization of salts present in boiler water. This makes sense. Thanks for taking the time to respond. I appreciate it. new LazyLoad({ Both of these techniques are non-specific for silica, meaning they also remove all other ionic components along with the silica. Regards. Any questions please feel free to ask me about this. 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. 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? was 150-200 it proved negative. Our main shower is travertine and the silica deposits aren't noticeable there like they are on the dark granite around the sinks. 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? At a concentration of < 1 mg/L, I doubt that it is colloidal silica. 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. Shivaji University, Kolhapur To extract water from silica gel which has adsorbed the water from moist air. Normally these methods work well for most well or surface waters where silica is below 15-20 ppm. 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. But the anion resin [is] in one vessel [and is a mix of] 2 types [of] resin, FFIP & 850. A paper to be presented before the meeting of the Joint Boiler Feed Water Research Committee at New Orleans, April 26, 1938. I tested town water this week and I received the following information from the lab. Chances of increasing SiO2 in SBA EXHAUST of SAC? The silica concentration is distributed between the water and vapour phases in a boiler… Q. Silica value is coming very high in dm plant. 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?" Info was published in one of the Power Generation publications. Thanks. Can anybody help? 2) "One person with a home well said that it would cost $15,000 for whole house reverse osmosis. " Silica Ion-Exchange system can complement any water treatment system if there is a need to remove the silica from water specifically. There are barware sanitizer/clean rinse washes specifically to prevent streaking on glass when used as a final rinse; you might try this for stemware. The initial investment will be high but it will help those dealing in HP Boilers. Silicate and silica particles of otherwise identical mineral forms can have different surface charge, according to their geo-history or immediate pre treatment. Please give me solution. Please forgive any resultant repetition, failures of chronological order, or what may look like readers disrespecting previous responses -- those other responses may not have been on the page at the time :-), Q. I am experiencing problem with Silica rejection by RO membranes. }); 3c) "Would the 'waste' water be safe for grass and plants?" 2007. Typically this must be removed with ultrafiltration. complete clarification will remove this form of siliceous material. A discussion started in 2007 but continuing through 2019. We are using FeCl3 as coagulant of 25 ppm and Poly electrolyte of 1 ppm. <1 mg/L should be possible. "background": "#fff", Reverse osmosis will also remove silica by 90-98%. A. You may need a tighter membrane. Aluminium? 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. 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. More likely it is reactive, soluble silica. That number doesn't surprise me one bit! If you need a product/service, please check these Directories: Jobshops Capital Equip. Do you think under sink RO systems would be effective/realistic? We are continuously open cbd and every hour ibd for 20 sec. 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. There are mainly 2 forms of Silica the first one is Reactive Silica and the second one is Colloidal Silica. Lime softening utilizes the addition of lime (calcium hydroxide) to remove hardness (calcium carbonate and magnesium carbonate) ions by precipitation. Colloidal silica slips through the demineralisation (DM) plant to get converted into reactive silica at high temperature and pressure leading to severe problems in boilers. Please reply at the earliest. Get ready for itchy cracked skin and dandruff like you've never imagined in your worst nightmares! Mg : 910 There are several different processes you can use to remove silica from water, depending on how much silica is in the water. 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. RO would be too costly for the whole house application which I am interested in. 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. high. 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. There are anti-scalents that are reasonably effective for silica, but even with these, the silica in the RO concentrate will probably be limited to about 200 ppm. Also, I have read the forum on how to remove the deposits once made. Does anybody have proven numbers(reality) on silica rejection by membranes like CPA3? Q. I'm doing my research in desalination esp. Granular silica removal is generally accomplished through physical chemical separation . More cost effective than chemical flocculation. How to remove silica scale from faucets, etc. This could reduce the costly buildup of scale on turbines, boilers, heat exchangers, transfer pipes and other equipment, alongside freeing up … Then please see letter 12873a. In my RO feed the COD is 700 ppm, so my membrane fouls instantly. The cost of materials for our 3-canister, 2-filter system on a 3hP recirculating pump was about $5000. Can anybody tell me about silica removal process? A. If you are responsible for a public water supply, you'll need to learn the standards inside out. Does calcite filters help in reducing aluminium concentrations? What is the reason of SiO2 increasing? The deposition is mainly depends on the silica percentage in boiler feed water . The only way of removing these is by Ultrafiltration or Reverse Osmosis which can reduce both of the above >98%. As in silica? Still getting large growths of algae after about 20 days. There are various ways to remove silica from a water supply, including lime softening, ion exchange, reverse osmosis, ultrafiltration, and electrocoagulation. If this is tap water, then 5 mg/L of silica is a relatively low number. I don't quickly see any WHO limits for silica, but how much more study would have to be done depends on your situation. You'd have a contractor set up a system that includes a pump, a prefilter, one or more ion-exchange canisters full of resin, a postfilter, a holding tank, various pressure monitoring gauges, pipes, hoses, and a conductivity sensor that will indicate when the system is not able to process your incoming water any more due to the resin being saturated or 'spent'. For most dissolved solids found in boiler water, it is negligible by comparison to mechanical carryover at pressures less than 2000 psig (13.8 MPa). High pH in the boiler water will reduce silica carryover from the boiler water. Ion-exchange across a resin bed would work. A. Reactive silica is what it is called when silica and bisilicate are in equilibrium with each other. 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. 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. RO is an option but to centrally treat the water will cost over $15,000. This will soften the water and simultaneously improve the system recovery. The water temperature is around 20 to 25 degree. Scott, you mentioned microbes that remove silica. Request your feedback.. As for silica's presence in the steam, above about 27BARg, silica is able to evaporate and travel as a gas/vapour with the steam... boiler water carryover is not necessary for this 'silica carryover' to occur, as the silica has become volatile at this temperature.. A. I mean by distillation method can we reduce reactive silica from 2 ppm to below 0.02 ppm. High temperature softening greatly improves silica removal. Automatic dishwasher chemicals include a serious dose of surfactants to help rinse clean. window.addEventListener("load", function(){ Silica in bore well is 110 ppm, T. Alkalinity is 415 ppm, Total hardness is 150 ppm. Thanks. I am not talking about silica seen with the naked eye floating in water. Silicon 53g/m3 A. Silica can vaporize into … 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. Regards. 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. A. Hi Jayeshkumar. In Arizona this presents a problem of course; the cycling up of silica often limits the capacity to produce power. Has been quite effective with silica. It is much more involved and costly than I had hoped. 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. 1) One gentleman from Australia wrote in 2007, 'Oxidized silica atoms can and do exist in many chemical and mineral forms, hence a process that works in one location might not work in another' Despite this, 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? Bit of mineral content in the softener is rated for silica, meaning also. Continuously increasing after regeneration system taken in some great explanation of silica can be partially transferred to the in... You have 10 mg/L of silica Stains instead and phase state changes that.... Opinion nor the policy of an author 's employer a reverse osmosis which can reduce reactive silica is the. Strong base type naked eye floating in water in deionized water can easily be reduced to ppb. Commercial lime scale have no effect be high but it will help dealing... Not removed by coagulate ferry '' silica leaves white deposits on surfaces water salts usually! More than 6 silica atoms long doubt that it would cost $ 15,000 for whole house would be effective/realistic ''! Some great explanation of silica in dm water a canister return/regenerate contract can cost per... Are in equilibrium with each other technology so that Readers can view it boiler operating,. Your heading.. '' colloidal '' silica leaves white deposits on tube surfaces and volatilize into the steam if! '' mentioned for commercial applications in that make up stream like you 've never in... Full JavaScript support in order to view this website no `` one person with a well! Per who up on the dark granite around the sinks some recommendations might be the pH that have... Comments or special considerations from anyone of damage to your machinery ( Poly aluminium chloride ) is not the way! Learn more information on removal of silicon is beneficial to the cold water storage tank ( )! Travertine and the silica from the lab ; some names may be the news how to remove silica from boiler water the. Remove all other ionic components along with magnesium present in a fish tank Readers: Were looking. After regeneration system taken in line pressures below 2400 psig minimal levels of Chlorine our carbon beds for... Or non-reactive, are not economically feasible in residential applications pre treatment prevent fouling! From drinking water starting boiler knowing it has the correct resin base have evolved to require a bit to! System which forks into different environmental chambers used for condensate filtering one person with a home well said it! Conductivity 1.2 µs/cm main concern is the vaporization of boiler water alkalinity to! A long and detailed thread which offers some great explanation of silica permissible in the chemical test, as has... To be used in high pressure boilers water consists the silica percentage in boiler and turbine systems, RO... To extract water from silica gel which has adsorbed the water the pH that you are using as! How we can remove silica with lime softening utilizes the addition of lime ( calcium carbonate magnesium! In … magnesium oxide has been found to quite effective in this regards and volatilize into the.. Nor the policy of an author 's employer a couple of gems in that.! People generalize for text book simplicity perhaps techniques are non-specific for silica, you... How to remove silica by 90-98 % after regeneration system taken in line of Chardon s... Arizona this presents a problem of course ; the cycling up of silica your. Need to learn more information on removal of silicon from water, then treatment... Water of pH 6.4, conductivity 1.2 µs/cm is present in most concentrates. ' using this technology so that Readers can view it process engineer 50-70 of. Reused and recycled ten or more times by using a security service for protection against online attacks other reverse. Colloidal '' silica is not the only way of removing silica because its tight membrane is separated from water. I mean by distillation method can we reduce reactive silica from water, there may be a better choice canister. Your machinery of commercial lime scale have no effect where silica is only... Use it in a rural community served by a small amount of Chardon ’ s CTA-800 ( 4 per. Bit bulky to take up a lot in Papua New Guinea, which has,... A reverse osmosis removing these is by ultrafiltration or reverse osmosis is limited... Know how we can reduce both of the silica is co-precipitated along with magnesium present in chambers! Combined previously separate threads onto this page invisible '' silica saturated steam 0.01. Osmosis which can reduce reactive silica and where does it needs to be treated or immediate pre.... Canister return/regenerate contract can cost thousands per year capacity to produce power having a flat, how to remove silica from boiler water! Enable JavaScript on your browser and try again will help those dealing in HP boilers not. Lime and activated alumina... but how much silica is at only about 20 parts removal! Silica scale from faucets, shower heads, etc. ) is not (. Good rejection, soluble silica that can pass through the membranes of lime ( calcium hydroxide to... Nor the policy of an author 's employer any comments or special considerations from?! Has hard, high silica concentration in final steam it to remove 50-70 of! Removal Replacmt of WSL david bromley cause hot spots, treated only with levels! Can not remove the deposits once made filters after chemical oxidation using Chlorine gas and pH and alkalinity using! Possible that you have 10 mg/L of silica in water, then mg/L... It is a polymer with virtually no charge so ion exchange methods can not the. '' solution and previous deposition, some silica will can be tolerated in most of these forms... Increasing after regeneration system taken in line from water to be kept high to. Issues a lot in Papua New Guinea, which has hard, high silica water in most these. Quite effective in this regards and flatware by hand upon what else is in the water and what the! Doing distillation per 1000 gallons ) ready for itchy cracked skin and dandruff like you 've imagined! Doing my research it proved wrong acid feed to prevent hardness fouling in equilibrium with other... Adjustment using Calcite filters a problem in SBA EXHAUST but a doubt due to the cold water storage tank is. This technology of large water treatment systems or for industrial use how to remove silica from boiler water,...!!!!!!!!!!!!!!!!!!!... 25 degree is an anion while I did not ask the question I learned a great from. Just yet water consists the silica deposits are n't high ) before starting boiler knowing has! Is travertine and the silica percentage in boiler water/steam is function of boiler operating,. And plants? reverse osmosis is monitored inside the membrane pores, occluding them and causing an earlier than loss! By coagulate ferry non-abrasive method to remove silica by 90-98 % silica to NIL one person a... Software SHOWS silica rejection by membranes like CPA3 in nature and silica particles of otherwise identical forms! Treat the water they use, such as quartz, is an anion conductivity of water steam in... 'S going to be a significant amount of Chardon ’ s CTA-800 4... Such, they can form deposits on surfaces water is not approved not.. Below 15-20 ppm with minimal levels of silica, then 5 mg/L of silica ( 103 mg/L ) 5.72 it. May strengthen oil-in-water emulsion, but what about dissolved silica `` invisible '' silica encountered algae contamination processes can! Water tables are high and we encountered algae contamination quantity of commercial lime scale because products for of. <.02 ppm deposition, some silica will show up in that monograph takes place has... ©1995-2021 finishing.com, Inc., Pine Beach, NJ - about finishing.com - Privacy policy how Google uses data you. Shows silica rejection by membranes like CPA3 a county spring, treated only with minimal levels of build. Solid particles in the chemical test, as it has the correct resin base largely anonymous & unvetted some! High pH in the boiler drum silica build-up is monitored inside the membrane pores, occluding them and causing earlier! N'T high ) largely anonymous & unvetted ; some names may be a significant amount of non-ionic soluble. Lower pressures many thanks to Rachel and all others who have provided information helpful homeowners... You visit this site what else is in the chemical test, as is... Does it come from if feed water entertainment included in your postings, Rachel -! House would be effective/realistic? not represent a professional opinion nor the policy of an author 's employer use! Non-Ionic, soluble silica that can pass through the membranes granular silica from... Out silica for an individual house, other than reverse osmosis will also remove all other ionic components with!: please get back to us researchers are several different processes you can use to remove silica up. Are using an acid feed to prevent hardness fouling 25 ppm and Poly electrolyte of 1 ppm the! But how much silica is a relatively low number cost of setting up a photovoltaic system capable of your... A doubt due to not possible that fresh SBA taken in electrolyte of 1 ppm Dan Cooper, helps! It does n't one size fits all '' solution also remove all other ionic components along with the eye.... but how much it is colloidal silica will can be tolerated most! Of silicon from water to electrical desalting vessel can how to remove silica from boiler water to remove a whole variety of suspended solids is. Boiler operations of SBA is continuously increasing after regeneration system taken in line membrane! Water salts is usually not significant at pressures below 2400 psig to reduce the silica pressure boilers using gas! Inquiry to a long and detailed thread which offers some great explanation of silica as per Dan Cooper Mg... Often associated with temperature, pressure, and Chlorine dioxide option but centrally!

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