The rotary drum filter uses a rotating metal drum covered with a filter cloth to continuously filter liquids. As the drum rotates through four sections - cake formation, washing, drying, and cake removal - liquids are vacuumed through the cloth and a solid cake is formed, washed, dried, and then scraped off in the cake removal zone. Rotary drum filters are commonly used for continuous, high-volume filtration applications in industries like wallboard production.
The studies influence techniques of filtration, its various types, and theories involved in the rate of filtration. This topic useful for physical pharmacy students and other concerned with filtration.
Filtration is commonly the mechanical or physical operation which is used for the separation of products like solids from fluids by interposing a medium through which only the fluid can pass.
The studies influence techniques of filtration, its various types, and theories involved in the rate of filtration. This topic useful for physical pharmacy students and other concerned with filtration.
Filtration is commonly the mechanical or physical operation which is used for the separation of products like solids from fluids by interposing a medium through which only the fluid can pass.
This is a presentation on rotary drum vacuum filters. Filtration Services are a leading designer and manufacturer of the rotary drum vacuum filter. This presentation aims to answer the questions you may have.
size reduction,laws involved in size reduction ,application & millsM Swetha
size reduction basic principles,laws&machanism of size reduction with all mills .I gave a note on size separation .it is very useful for the teaching staff &students of B.pharmacy
This is a presentation on rotary drum vacuum filters. Filtration Services are a leading designer and manufacturer of the rotary drum vacuum filter. This presentation aims to answer the questions you may have.
size reduction,laws involved in size reduction ,application & millsM Swetha
size reduction basic principles,laws&machanism of size reduction with all mills .I gave a note on size separation .it is very useful for the teaching staff &students of B.pharmacy
Size Separation: Objectives, applications & mechanism of size separation, official standards of powders, sieves, size separation Principles, construction, working, uses, merits and demerits of Sieve shaker, cyclone separator, Air separator, Bag filter & elutriation tank.
Dear Readers,
The presentation may be helpful for those who wants to know the basic concept of paper making process.
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Nirjhar.
Objectives, applications & Theories in FILTRATIONAkankshaPatel55
Filtration is a physical separation process that separates solid matter and fluid from a mixture using a filter medium that has a complex structure through which only the fluid can pass. Solid particles that cannot pass through the filter medium are described as oversize and the fluid that passes through is called the filtrate. Oversize particles may form a filter cake on top of the filter and may also block the filter lattice, preventing the fluid phase from crossing the filter, known as blinding. The size of the largest particles that can successfully pass through a filter is called the effective pore size of that filter.
Filtration is used in many different applications, including:
Water treatment: to remove impurities from water, such as sediment, bacteria, and viruses.
Air filtration: to remove dust, pollen, and other allergens from air.
Oil filtration: to remove impurities from oil, such as dirt, metal shavings, and water.
Chemical processing: to separate solids from liquids in chemical reactions.
Food and beverage processing: to clarify liquids, such as juice, wine, and beer.
There are many different types of filters, each with its own advantages and disadvantages. Some common types of filters include:
Depth filters: These filters are made of a thick layer of material, such as paper, cloth, or sand. The solid particles are trapped in the pores of the filter medium.
Surface filters: These filters are made of a thin layer of material, such as a membrane. The solid particles are trapped on the surface of the filter medium.
Cartridge filters: These filters are self-contained units that can be easily replaced.
Bag filters: These filters are made of a bag of fabric that is suspended in a housing. The solid particles are trapped in the fabric of the bag.
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Report rotary drum filter
1. Rotary Drum Filter
The most common type of continuous vacuum filter is the rotary drum filter in which
liquor is sucked through a moving septum to deposit a cake of solids. The cake is moved out of
the filtering zone, washed, sucked dry and dislodged from the septum.
Construction:
It is consisting on a sheet metal drum. The diameter of drum ranges from 1 to 10 feet.
This drum is carried on moving system. A vacuum system is also attached, so that, during
filtration whole drum work under vacuum. The surface of the drum is the divided into different
section by stripes.
2. i- Cake formation zone
ii- Washing zone
iii- Drying zone
iv- Cake removal zone
These steps are parallel to the axis of drum and welded to the shell. Filter medium is hold by
metal strips on drum and covered by filter cloth.
In each section there are many pipes which open inside the cover plates. The side cover
plate. There is also a stationary valve plate through which connection are made to the filtrate
receiver. For compressed air and wash water connection vale are also given.
After washing, to remove the cake “Doctor knife” is provided. Doctor knife remove only
the cake of from septum and does not damage the pre-coated layer of filter aid.
Working:
Before filtration rotary drum filter is dip in tank of filter aid for pre-coating purpose.
Commonly is pre-coated up 3” to 5” by diatomaceous earth, perlite or purified wood cellulose.
After that drum is rotated in slurry tank at a speed of 1 to 2 rpm. 1/3 of drum is dip in
slurry tank, vacuum is applied through a valve and filtration is started.
A layer solid builds in the form of cake on the surface of panel (filter cloth) in cake
formation zone and filtrate pass through pipes and goes to vacuum receiver and collected in tank.
As, the panel leave the cake formation zone it enters to washing zone and in which water is
sprayed on cake to extract all filtrate from cake and it sent to wash vacuum receiver. And panel
3. enters to drying zone. In this section high vacuum is applied and all
filtrate is sucked and cake is obtained in completely dried form.
Now this panel is moved to cake removal zone in which doctor
knife remove dried cake from filter cloth without damaging the filter
cloth. After that this panel again enter to cake formation zone for
continuous filtration and cycle is repeated.
Applications:
These filter are developed to overcome large problem of filter
press and leaf filter. It is very versatile filter.
It is used generally for those operation in which the volume is
very large, where process is continuous and where is labor cost must be
kept downs. It is used where colloidal particles.
It is used for production of wallboard from gypsum.
Limitations:
It cannot be used for mixture of colloidal and coarse particles.
It must be used continuously.
Filter Auxiliaries:
For rotary drum filter the auxiliaries are shown in figure as,
a- Rotary drum filter
b- Vacuum arrangement
c- Filtrate Pump
d- Filtrate receiver
e- Filtrate separate
4. Cake DischargeMethods:
The five basic cake discharge types are given bellow,
i- Scraper discharge
ii- Belt discharge
iii- Pre-coat discharge
iv- Roll discharge
v- String discharge
Each is designed to be able to discharge specific types of
formed cake solids.
Scraper Discharge: In this method scraper is used to remove cake from septum (filter cloth).
For this purpose, scraper having sharp edges is provided in cake removal zone. But filter cloth
selection must provide good wear and air blow back to release cake. Scraper has high resistance
against solid blinding. It’s used for wide and hard layer of cake. Due to scraper discharge
filtration rate increase. It has simple design.
5. Belt Discharge: In this method of removing cake endless belt is used made by tensionless
material is used. For this belt tracking, cake release and media cleaning are of major importance
for efficient operation. The first task is to ensure that a septum (filter cloth) is selected which
provides a smooth surface for good release, good wear resistance well dimensional stability.
Cake is removed by high pressure water which is spray on moving belt. The speed of belt is
adjusted by the nature of cake and process to maintain the track. Dimensional stability is very
important for belt discharge. Best for slurries with moderate solid content. It is most complicated
design for cake discharge. In this design cloth continuously cleaned.
Precoat Discharge: This method is designed for those filtration operation in which filter aid is
added to slurry. Mean that it is well suited for those slurries which having very low concentration
6. of solids and difficult to filter. In this design knife can damage the septum so, in this design
septum is disposable and renewable. Typical filter medium is diatomaceous earth or perlite. To
remove the cake advanced knife is used.
Roll Discharge: Actually it is modified form of scraper discharge. In this method a scraper is
adjusted on revolving roll and remove cake from septum. Roll speed must be match to rpm of
drum. This design is used for sticky and mud like cake and where slurry having high content of
solids. It having low filtration rate.
String Discharge: In this method a string having high strength is used to discharge cake. But
besides the usual media, it requires well maintained track and good alignment. It is used for
slurries having high content of solids. Solids must be fibrous, stringy or pulpy material. In this
design of filter cloth is critical.