Shopping on line can be easy, simple and save you lots of money. It can also take a lot of your time, frustrate you, and result in unwanted purchases. Now the same can be said for regular high street shopping, but with the vast opportunity presented by the Internet it will pay you to spend a few minutes reading this and understanding how to better optimize your Scrubber shopping experience:
1. Compare - without doubt the biggest advantage that the Scrubber offers shoppers today is the ability to compare thousands of Scrubber at a time. This is a great thing, but not necessarily all the time! Too much can be daunting at times so take advantage of the great comparison sites and where possible let them do the hard work for you.
2. Research - if it has been said it will be on the internet. Ignorance is no longer a justifiable reason for buying the wrong thing. Take the time to research in detail everything that you could possible want to know about
3. Testimonials - don't know anybody that has bought a Scrubber? Wrong! If the Scrubber is good the internet will let you know. Use the Internet as a friend and get testimonials before you buy.
4. Questions - Got a question about Scrubber then search the Forums, FAQ's, Blogs etc. Don't be afraid to ask .....
5. Reputation - Never heard of the company selling Scrubber? Don't worry, no reason why you should know every company in the world, but you know someone that does! Use the internet to find out what people are saying about Scrubber and build up a picture of their reputation for sales, returns, customer service, delivery etc.
6. Returns - still worried that even after all of the above your Scrubber wont be what you want? Check out the returns policy. There is so much competition now that someone, somewhere is bound to offer the terms that you are comfortable with.
7. Feedback - happy with your Scrubber then let people know, after all you are depending on others people input in your buying decision, so why not give a little back.
8. Security - check for the yellow padlock on the Scrubber site before you buy, and the s after http:/ /i.e. https:// = a secure site
9. Contact - got a question about Scrubber, or want to leave a comment then check out the sites contact page. Reputable companies have them and respond.
10. Payment - ready to pay for your Scrubber, then use your credit card or PayPal! Be aware of companies that don't accept them, there may be genuine reasons but given the huge amount of choice you have when buying online there is no reason at all not to buy via credit card or PayPal.
This article is about the pollution control device, for other uses, see scrubber (disambiguation).
Scrubber systems are a diverse group of
air pollution control devices that can be used to remove
particulates and/or gases from industrial exhaust streams. Traditionally, the term "scrubber" has referred to pollution control devices that used liquid to "scrub" unwanted pollutants from a gas stream. Recently, the term is also used to describe systems that inject a dry reagent or
slurry into a dirty exhaust stream to "scrub out" acid gases. Scrubbers are one of the primary devices that control gaseous emissions, especially acid gases.
Removal and neutralization
The exhaust gases of
combustion may at times contain substances considered harmful to the environment, and it is the job of the scrubber to either remove those substances from the exhaust gas stream, or to neutralize those substances so that they cannot do any harm once emitted into the environment as part of the exhaust gas stream.
Wet scrubbing
A
wet scrubber is used to clean
air or other gases of various
pollutants and dust particles. Wet scrubbing works via the contact of target compounds or particulate matter with the scrubbing solution. Solutions may simply be
water (for dust) or complex solutions of reagents that specifically target certain compounds.
Removal efficiency of pollutants is improved by increasing residence time in the scrubber or by the increase of surface area of the scrubber solution by the use of a spray nozzle, Packed bed towers or an aspirator.
Wet scrubbers will often significantly increase the proportion of water in waste gases of industrial processes which can be seen in a stack plume.
===Dry scrubbing===
A
dry scrubber or dry scrubber, unlike the wet scrubber, does not saturate with moisture the flue gas stream that is being treated. In some cases no moisture is added; while in other designs only the amount of moisture that can be evaporated in the flue gas without condensing is added. Therefore, dry scrubbers do not have a stack steam plume or
wastewater handling/disposal requirements. Dry scrubbing systems are used to remove
acid gases (such as SO2 and HCl) primarily from combustion sources.
There are a number of dry type scrubbing system designs. However, all consist of two main sections or devices: a device to introduce the acid gas sorbent material into the gas stream and a particulate matter control device to remove reaction products, excess sorbent material as well as any particulate matter already in the
flue gas.
Dry scrubbing systems can be categorized as dry sorbent injection or as spray dryer. Spray dryer absorbers are also called semi-dry scrubbers or spray dryers.
Dry sorbent injection involves the addition of an
alkaline material (usually
hydrated lime or soda ash) into the gas stream to react with the acid gases. The sorbent can be injected directly into several different locations: the combustion process, the
flue gas duct (ahead of the particulate control device), or an open reaction chamber (if one exists). The acid gases react with the alkaline sorbents to form solid salts which are removed in the particulate control device. These simple systems can achieve only limited acid gas (SO2 and HCl) removal efficiencies. Higher collection efficiencies can be achieved by increasing the flue gas
humidity (i.e., cooling using water spray). These devices have been used on
medical waste incinerators and a few
municipal waste combustors.
In
spray dryer absorbers, the
flue gases are introduced into an absorbing tower (dryer) where the gases are contacted with a finely atomized alkaline
slurry. Acid gases are absorbed by the slurry mixture and react to form solid salts which are removed by the particulate control device. The heat of the flue gas is used to evaporate all the water droplets, leaving a non-saturated flue gas to exit the
absorption tower. Spray dryers are capable of achieving high (80+%) acid gas removal efficiencies. These devices have been used on industrial and utility boilers and municipal waste combustors.
Mercury removal
mercury (element) has no known beneficial uses in nature, but it is a common substance found in coal that must also be removed. Wet scrubbers are only effective for mercury removal under certain conditions. Mercury vapor in its elemental form, Hg0, is insoluble in the scrubber slurry and not removed. Oxidized mercury, Hg2+, compounds are more soluble in the scrubber slurry and can be captured. The type of coal burned as well as the presence of a selective catalytic reduction unit both affect the ratio of elemental to oxidized mercury in the flue gas and thus the degree to which the mercury is removed.
Scrubber waste products
One side effect of scrubbing is that the process only moves the unwanted substance from the exhaust gases into a solid paste or powder form. If there is no useful purpose for this solid waste, it must be either contained or buried to prevent environmental contamination. Limestone-based scrubbers can produce a synthetic gypsum of sufficient quality that can be used to manufacture
drywall and other industrial products.
Mercury removal results in a waste product that either needs further processing to extract the raw mercury, or must be buried in a special hazardous wastes
landfill that prevents the mercury from seeping out into the environment.
Bacteria spread
Until recently, scrubbers have not been associated with health risks involving bacteria spread as a result of inadequate cleaning, unlike other devices such as cooling towers. However, a 2005 outbreak of Legionnaires' disease in Norway was proven to emanate from a scrubber, causing ten deaths and more than fifty cases of infection as it spread the bacteria through the air during a period of only two weeks. This particular system had undergone regular cleaning routines every three weeks. This case is believed to be the first documented case of a scrubber being the source of such bacteria spread.
See also
External links
- Cross section of an air scrubber system – From Encarta
- How is SO2 waste recycled to make wallboard?
This article is about the pollution control device, for other uses, see scrubber (disambiguation).
Scrubber systems are a diverse group of air pollution control devices that can be used to remove
particulates and/or gases from industrial exhaust streams. Traditionally, the term "scrubber" has referred to pollution control devices that used liquid to "scrub" unwanted pollutants from a gas stream. Recently, the term is also used to describe systems that inject a dry reagent or slurry into a dirty exhaust stream to "scrub out" acid gases. Scrubbers are one of the primary devices that control gaseous emissions, especially acid gases.
Removal and neutralization
The exhaust gases of
combustion may at times contain substances considered harmful to the environment, and it is the job of the scrubber to either remove those substances from the exhaust gas stream, or to neutralize those substances so that they cannot do any harm once emitted into the environment as part of the exhaust gas stream.
Wet scrubbing
A wet scrubber is used to clean
air or other gases of various pollutants and dust particles. Wet scrubbing works via the contact of target compounds or particulate matter with the scrubbing solution. Solutions may simply be
water (for dust) or complex solutions of reagents that specifically target certain compounds.
Removal efficiency of pollutants is improved by increasing residence time in the scrubber or by the increase of surface area of the scrubber solution by the use of a spray nozzle,
Packed bed towers or an aspirator. Wet scrubbers will often significantly increase the proportion of water in waste gases of industrial processes which can be seen in a stack plume.
===Dry scrubbing===
A
dry scrubber or dry scrubber, unlike the wet scrubber, does not saturate with moisture the flue gas stream that is being treated. In some cases no moisture is added; while in other designs only the amount of moisture that can be evaporated in the flue gas without condensing is added. Therefore, dry scrubbers do not have a stack steam plume or wastewater handling/disposal requirements. Dry scrubbing systems are used to remove acid gases (such as SO2 and HCl) primarily from combustion sources.
There are a number of dry type scrubbing system designs. However, all consist of two main sections or devices: a device to introduce the
acid gas sorbent material into the gas stream and a particulate matter control device to remove reaction products, excess sorbent material as well as any particulate matter already in the
flue gas.
Dry scrubbing systems can be categorized as dry sorbent injection or as spray dryer. Spray dryer absorbers are also called semi-dry scrubbers or spray dryers.
Dry sorbent injection involves the addition of an alkaline material (usually
hydrated lime or
soda ash) into the gas stream to react with the acid gases. The sorbent can be injected directly into several different locations: the combustion process, the
flue gas duct (ahead of the particulate control device), or an open reaction chamber (if one exists). The acid gases react with the alkaline sorbents to form solid
salts which are removed in the particulate control device. These simple systems can achieve only limited acid gas (SO2 and HCl) removal efficiencies. Higher collection efficiencies can be achieved by increasing the flue gas
humidity (i.e., cooling using water spray). These devices have been used on medical waste incinerators and a few
municipal waste combustors.
In
spray dryer absorbers, the
flue gases are introduced into an absorbing tower (dryer) where the gases are contacted with a finely atomized alkaline slurry. Acid gases are absorbed by the slurry mixture and react to form solid
salts which are removed by the particulate control device. The heat of the flue gas is used to evaporate all the water droplets, leaving a non-saturated flue gas to exit the absorption tower. Spray dryers are capable of achieving high (80+%) acid gas removal efficiencies. These devices have been used on industrial and utility
boilers and
municipal waste combustors.
Mercury removal
mercury (element) has no known beneficial uses in nature, but it is a common substance found in coal that must also be removed.
Wet scrubbers are only effective for mercury removal under certain conditions. Mercury vapor in its elemental form, Hg0, is insoluble in the scrubber slurry and not removed. Oxidized mercury, Hg2+, compounds are more soluble in the scrubber slurry and can be captured. The type of coal burned as well as the presence of a selective catalytic reduction unit both affect the ratio of elemental to oxidized mercury in the flue gas and thus the degree to which the mercury is removed.
Scrubber waste products
One side effect of scrubbing is that the process only moves the unwanted substance from the exhaust gases into a solid paste or powder form. If there is no useful purpose for this solid waste, it must be either contained or buried to prevent environmental contamination. Limestone-based scrubbers can produce a synthetic
gypsum of sufficient quality that can be used to manufacture drywall and other industrial products.
Mercury removal results in a waste product that either needs further processing to extract the raw mercury, or must be buried in a special hazardous wastes landfill that prevents the mercury from seeping out into the environment.
Bacteria spread
Until recently, scrubbers have not been associated with health risks involving bacteria spread as a result of inadequate cleaning, unlike other devices such as cooling towers. However, a 2005 outbreak of
Legionnaires' disease in Norway was proven to emanate from a scrubber, causing ten deaths and more than fifty cases of infection as it spread the bacteria through the air during a period of only two weeks. This particular system had undergone regular cleaning routines every three weeks. This case is believed to be the first documented case of a scrubber being the source of such bacteria spread.
See also
External links
- Cross section of an air scrubber system – From Encarta
- How is SO2 waste recycled to make wallboard?
Numatic Vacuum Cleaners : Scrubber Dryers : Carpet Cleaners : Rotary ...
Offers a range of commercial and industrial Numatic vacuum cleaners and spares.
Scrubber Dryers - Express Cleaning Supplies UK
Scrubber Dryers - Award winning UK suppliers with online ordering. View our prices now. ... Home - > Entire range-> Scrubber Dryers. scrubber dryers All prices subject to VAT.
Scrubber - Wikipedia, the free encyclopedia
Scrubber systems are a diverse group of air pollution control devices that can be used to remove particulates and/or gases from industrial exhaust streams.
HSS Hire › Floor Scrubber/polisher
HSS Hire - An industrial scrubber which is ideal for cleaning large areas rapidly. Will also polish most types of solid flooring but polishes must be applied by hand.
HSS Hire › Floor Scrubber/dryers
HSS Hire - A professional range of floor scrubbers which clean and dry most types of hard flooring in a single operation.
Scrubber Publications
WRITING ON WATER a collection of poems about UK canals with photographs by Carl Hopley and Agui da Palma. 'The rain breaks through as we reach our destination,
Fox
know existed. Scrubber turns out a lovingly crafted record that is as much a
PG Cleaning Scrubber Dryers
New & Used Machines Available - Replacement Batteries - Chemicals & Paper Products - Floor Machines - Sweepers - Scrubber Dryers - Vacuum Cleaners - Pressure Washers - Steam ...
clean store - products - Scrubber Dryers
CleanStore provides quality cleaning products for delivery across the UK.
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Providers of pressure washers, steamers and floor cleaners.
