Monthly Archives: June 2015

Types of Industrial Water Treatment Equipment

Industrial water treatment equipment comes in a variety of implementations, all designed to suit particular operating needs. Filter presses, bed filters, cartridge filters and bag filters all excel in their intended applications. We’ll look at each type of filter and examine what applications it is most appropriate for below.

Filter Presses

Where most industrial water treatment equipment is designed to remove solid material from water, filter presses are designed to remove water from the solids. Filter presses are ideal for any filtration application where enough material needs to be removed so that more conventional filtration methods would be ineffective. A filter press operates, as the name implies, by exerting physical pressure usually in the form of either air or a water-filled diaphragm on a slurry mixture and extracting the moisture. The remaining cake of material is then disposed of.

Bed Filters

Bed Filters are filters with a bed of material (typically crushed walnut shell, sand, anthracite or activated carbon) that removes contaminants. Material is collected throughout the depth of the bed, allowing large amounts of material to be collected before a backwash cycle is initiated. Inlet water pumps through the filtration medium, which collects and suspends contaminants. Once the medium is saturated with contaminants, a backwash cycle is initiated. The filtration medium is fluidized and washed. This industrial water filtration method cleans the medium and readies the filter for use. This reuse of the filtration medium minimizes waste associated with the process.

Cartridge Filters

Cartridge filters are disposable, replaceable, self-contained filtration units. They consist of a central perforated core wrapped in layers of filtration material. Inlet water is pumped in through the top of the filter core, and passes through the walls of the filter. Contaminants can be caught throught the depth of the filter cartrige, which allows individual cartridges to achieve very high filtration efficiencies. Cartridge filters are typically used where high purity water is required.

Bag Filters

Bag filters are similar to cartridge filters in that they are also disposable and replaceable. Bag filters are shaped like a large sock, and are sometimes called sock filters or filter pots. They catch contaminants on the surface of the bag, and are typically used as a low cost option to remove particulate from wastewater streams.

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Reduce Operating Costs With An Automatic Filter Press

The automatic filter press is a very specialized tool, and it excels at its designed task. Removing moisture from slurry is a difficult but essential part of many industrial processes. There are many ways to accomplish this, but the automatic filter press requires the least maintenance and operator attention of any of the available options.

Operational Benefits

The Verti-Press automatic filter press offers many benefits over comparable technologies. The largest advantage is in its automation. The entire process from slurry to cake is handled completely automatically, and the results are discharged out to a single location at the end of every cycle (eliminating the need for redundant processing equipment). The process is handled by a programmable controller (PLC), which eliminates the need for a full-time operator. These benefits result in a significantly shorter cycle time than competing technologies.

The fact that the Verti-Press chambers themselves are compact and stacked vertically saves floor space. Each chamber can be isolated for individual operation. The cakes produced can have a moisture content that is far less than those produced by vacuum filtration, plate and frame filters, or belt presses.

Contact

For more information about our Verti-Press automatic filter press, you can take a look at the information page or contact us directly and we can determine if an automatic filter press is the right fit for your particular needs.

 

Industrial Wastewater Treatment Solutions For Your Company

Selecting the right water treatment solutions for your particular needs is sometimes a difficult process.  There are a lot of contributing factors to consider: the rate of filtration, the size of expected contaminants, the harshness of the expected operating environment, and even the intended use of the filtered water.  Fortunately, there are many industrial water solutions available and, with some consideration, the best water filtration equipment for the job can be determined.

Intended Use

One of the most important factors in selecting the right water treatment solution is its intended use.  For some applications, the clean water itself is the desired product of the process.  For others, the material that is filtered is the primary concern.

If the water itself is the focus of the filtration, there are many solutions that may be appropriate.  Factors such as flow rate and minimum contaminant size become more important.  If the water you are filtering contains oil-based contaminants, walnut shell media would be a good choice.  If the water is intended for drinking, there are a number of bag filters with an activated carbon layer that would remove any unwanted tastes and smells.

Flow Rate

Desired flow rate is a signficant point to consider when selecting water filtration equipment.  Cartridge filters, bag filters, deep bed filters, and filter presses are all sized differently, and the liquid flow rate can have a large effect on the size of the filter.  It is important to have a general notion of how much fluid you will need to pass through your industrial water filter to meet your production needs.

Operating Conditions

It’s also necessary to consider the conditions under which your industrial water treatment system will operate.  Bag filters, for instance, are an excellent disposable filter medium, yet many are not rated for high-temperature applications.  The corrosivity and other chemical properties of the inlet water (eg acidity) will also determine what materials need to be used for both the filter medium and filter housing.

There is a wide range of water treatment solutions available, and we can help you find the right fit for your particular need.  Get in contact with one of our filtration experts and we can help find the right solution for you.

How Industrial Water Filters Work

Industrial water filter design centers around separating contaminants, either solid or liquid, from a process fluid.  There are generally two types of industrial water filters designed for this use: surface filters, which consist of a single layer of filter material and rely on physically straining the fluid to extract contaminants, and depth filters, which are designed to use a porous filtration medium to collect contaminants throughout the medium, rather than just on the surface.  Depth filters are used predominantly in industrial water treatment because they allow the filter to retain a higher volume of contaminants before becoming clogged. This is due to the substantially higher available collection area (since contaminants are being collected throughout the depth of the medium, rather than merely on the surface layer of the filter).

Depth filters used in industrial water filtration typically use one of two types of filtration systems: filters with a bed of media, or cartridge filters.  While both of these systems perform similar activities, they differ in their effectiveness and optimal use.  Both types of filtration systems rely on fluid being forced through the filtration medium, either by pumping or using gravity to drain through.

Fluid is driven through the filter medium following constricted, tortuous routes, and the contaminants are caught, either due to direct collision with the filtration medium or precipitated by molecular attractive forces.  The selection of the type of filter media to remove contaminants is dependant on removal goals, as well as the type of contaminant.

Deep Bed Filters

Many different types of material are used in filter beds.  Sand filters are typically used in municipal treatment plants, walnut shell filters where oil removal is needed, and activated carbon for removal of heavy metals and other contaminants.  Over time, once the filter becomes restricted with captured particulates, a backwash of the bed is initiated.  Flow is redirected so that the downstream equipment is not contaminated, and the filtering layers are mechanically agitated.  Water is circulated through the filter during the agitation process to collect contaminants and, once the process is complete, exits through the backwash screen.  This screen allows the waste to pass through while retaining all of the filter media.  The wastewater is then sent to either upstream processing equipment or waste handling, and the filter is again ready for use.

Deep bed filters are used to filter drinking water, polish wastewater or cooling water, and as pretreatment for water desalination.  They are particularly effective as a means of removing solid particulates while minmizing maintenance.  The ability to backwash deep bed filters eliminates the need to replace filter media.  If activated carbon is used as a filtration medium, the filtration process will also remove tastes and smells from the filtered water.

Cartridge Filters

Cartridge filters for industrial water treatment systems usually consist of a single piece of filter material wound around a perforated cylinder, which is made of metal or plastic.  The unfiltered fluid enters the filter and is forced through the medium.  Once the filtration medium has reached its maximum contaminant load, it is discarded.  Cartridge filters are a low cost alternative to bed filters, that can achieve very high contaminant removal efficiencies at a fraction of the cost.