Filtration is a simple, practical and among the most popular methods of water treatment. It is defined as the act of trapping Total Suspended Solids (TSS) against a rigid barrier with a known porosity. The filter selection process consists of selecting the required square footage of surface area to achieve a specific flow rate while achieving removal of solids of the desired diameter. Filtration porosity is expressed in microns (µm). Blue Sphere distributes every type of filtration technology available. There is a filter for all applications. The product family of filtration can be divided into two primary sub groups; Replaceable Media Filtration and Permanente Media Filtration. However, some absorption based technologies such as granular activated carbon (GAC), exist in a gray area between these two generalizations. For purposes of organization, GAC is included under permanent media filtration.
Replaceable Media Filtration - Housings
Bag Filter housings offer practical liquid filtration for solids ranging from 200 down to 10 microns. These housings offer a low capital investment but typically suffer from a higher operational cost as the media must be replaced as it blinds with solids. The principle of operation is simple. Solid laden water flows though the housing and solids are trapped in a removable filter bag. Once the filter bag is full of solids it is thrown away and replaced. Applications for bag filters include process water filtration and wastewater filtration. Bag filters can be an effective polishing technology when positioned behind DAF or clarifier units. Bag filters are also effective in some cooling water applications for condenser water filtration or evaporator water filtration. Bag filters have no solid laden backwash stream and therefore make very good sense in situations where high volume separate source backwash water is not available or where backwash streams cannot be sent to drain. Single position filter housings can accept flow ranging from 25-200gpm dependent upon the media selection water properties and frequency of human interface with the device desired. Multi-round bag filter housings are available for larger applications which can hold from 2 to 21 #2 filter baskets and accommodate flow rates up to 3500gpm. Units are available in carbon steel or stainless, with or without ASME stamps.View Single Round Brochure View Multi-Round Brochure
Cartridge Filtration is a widely used solids removal method, effective down to 1 micron. Cartridge filters offer a low capital investment but typically suffer from a higher operational cost as the media must be replaced as it blinds with solids. There are many specialty filter cartridges available including oil absorbing media, carbon impregnated media and resin impregnated media. The principle of operation is simple. Solid laden water flows though the filter cartridge and out the center. Solids are trapped on the outside of the cartridge. Once the outside surface area of the cartridge is blinded off the cartridge is thrown away and replaced.
Applications for cartridge filters encompass nearly anything in industrial process water treatment and effluent wastewater polishing. Small inline cartridge filters (as pictured left) can protect sensitive process equipment at the point of use. Multiple element or multi-round cartridge filter housings are effective for chilled water loops or circulation systems. In some applications specialty media can be used for polishing wastewater effluent to meet demanding discharge permit criteria. Cartridge filters have no solid laden backwash stream and therefore make very good sense in situations where high volume separate source backwash water is not available or where backwash streams cannot be sent to drain.
Options for Cartridge filter housings available from Blue Sphere include single, three, six and position housings which can accept 10″ – 40″ filter cartridges and flow rates up to 120gpm. Larger multi-round housings accommodate from 11-205 cartridges and flow rates up to 4100gpm. Materials of construction include carbon steel and stainless steel. Pressure options include 100psi vessels and 150psi rated vessels. ASME stamped vessels are also available.View Single Round Brochure View Three Round Brochure View Six Round Brochure View Multi Round Brochure
Big Blue plastic cartridge filter housings are an economical choice for low volume process filtration in commercial or light industrial applications. These housings accept 10″ or 20″ length, 4.5″ diameter cartridges. We recommend these housings for flow rates less then 25gpm at pressures not exceeding 80psi.View Big Blue Brochure
Replaceable Media Filtration - Filters
Pleated bag filters offer substantially higher square footage then conventional bag filters. This is attractive in instances where longer filter runs between operator interface is desired. A large range of materials and micron ratings is available.View Pleated Bag Brochure
Economical pleated cellulose filters from the CellflexTM line. These filters offer outstanding economy per available surface area and are rated at 20 microns. They are an ideal choice for effluent wastewater or process water filtration.View Coreflex Brochure
Pleated cellulose cartridge filters from the CellflexTM line. These filters offer exceptional surface area for long filter runs between operator interface. They are available in the in 1-50 micron range for general filtration needs.View Pleated Brochure
Polypropylene cartridges from the VersaflexTM line. These filters offer superior chemical resistance and minimal fiber release. They are made of 100% polypropylene and manufactured with FDA-listed materials using a thermal-bonding process. The HE series features absolute micron ratings with an efficiency of 99%.View Melt Blown Brochure View Spun Bonded Brochure View High Efficiency Brochure
Pleated Polypropylene filters from the PureflexTM line. These cartridges offer high surface area, superior chemical resistance and a 90% efficiency rating. They are made of 100% polypropylene and manufactured with FDA-listed materials using a thermal-bonding process.View Pleated Polypro Brochure
Wound Depth Cartridge Filters form the StringflexTM line. These filters are available in micron ratings from 0.5 – 400 at 90% efficiency. Wound cartridges excel in applications involving high or low temperature extremes.View String Wound Brochure
Reusable stainless steel filters from the SteelflexTM line. These filter cartridges are available in 5-840 micron ratings. They are able to withstand pressure differentials of up to 60psi and operational temperatures up to 500F.View Stainless Brochure
The OAC Plus cartridge filter is made using a proprietary media which chemical bonds to hydrocarbons. This filter can hold up to 340 times its weight in hydrocarbons and achieve 95% removal of free or emulsified oil. the OAC Plus cartridge is an ideal choice for effluent polishing in industries facing low oil/grease discharge limits.View OAC Brochure
Absolute PES membrane cartridges from the PentaflexTM line. These filters are utilized for high purity applications requiring sub-micron filtration. The effective range of the membrane cartridges is 0.1-0.8 microns. These filters are rated at 99.98% removal efficiency.View Membrane Brochure
Permanent Media Filtration
The principle of operation of a disk filtration unit is; a series of disks which have ridges on their surface are squeezed together to form a filter. Picture a stack of flat donuts. Solids laden water flows though the housing and though the disk stack. Solids are trapped on the outside face of the disk stack. Upon reaching an adjustable pressure differential, the flow though the housing is briefly reversed and the pressure holding the disk stack together is relieved. The solids are blown out to drain with a minimal amount of water. The pressure is then reapplied to the disk stack and the unit is returned to service.
Applications for disk filters include cooling water side stream filtration and post filtration of wastewater streams. Any application which would benefit from a low backwash requirement filter is ideal for a disk filtration system. Disk filters can handle flow rates from 50 up to 5,000 gallon per minute.
Options for disk filters include different micron rated disk stacks, backwash source configurations and control interfaces. These systems are engineered on a per case basis. Contact us with the specifics of your application and Blue Sphere will work with you to develop a cost proposal.
The principle of operation for media filtration is simple. Solid laden water to flow into a vessel under pressure. The solids are trapped against a bed of media such as sand. The water permeates the bed while the solids are left behind. Once the bed is blinded the filter enters a backwash stage where the flow though the vessel is reversed and increased to blow the trapped solids to drain.
Applications for sand filters include process water clarification, condenser water side stream filtration and wastewater recycling. Any applications which demands a high volume of consistently low TSS effluent is a good candidate for this filtration method.
Options for sand filters include different backwash source configurations and control interfaces. These systems are engineered on a per case basis. Contact us with the specifics of your application and Blue Sphere will work with you to develop a cost proposal.
The principle of operation for GAC filtration is for contaminant laden water to flow into a vessel under pressure. Carbon is porous and forms chemical bonds with organic and inorganic chemicals as they pass through the media bed. Once the bonding sites have been exhausted, the carbon is deemed “spent” and must be replaced.
Typical applications for granular activated carbon include BOD/COD polishing of wastewater and de-chlorinization of process water.
Options for GAC filters include customized systems which feature steam assisted backwash, alternate backwash source configurations, water analysis based control/alarm systems and various control interfaces. These systems are engineered on a per case basis. Available housing materials of construction include poly-glass, fiberglass, epoxy coated carbon steel, stainless steel. Contact us with the specifics of your application and Blue Sphere will work with you to develop a cost proposal.
Micro Screens are a permanent media filtration option for the reduction of TSS. These devices utilize a laser perforated screen. Modern designs incorporate self-cleaning mechanisms that require a minimal amount of backwash.
The principle of operation for a micro screen is for solid laden water to flow into a vessel under pressure. Solids are trapped by a rigid screen and water permeates the screen. When a present pressure differential is reached, an internal vacuum wand removes solids from the screen. This is accomplished without loss of forward flow.
Applications for micro screens include effluent wastewater polishing, process water pretreatment and cooling tower side stream filtration.
Flow rates in excess of 5000gpm can be accommodated and screen porosity of 5-4000 microns are available. Contact us with the specifics of your application and Blue Sphere will work with you to develop a cost proposal. Additional technical information on Forsta Filters can be found at forstafilters.com
Blue Sphere can design and provide customized filter solutions for any process. As a standalone process or as part of an integrated pre-treatment plant, our fabrication and controls experts can meet the needs of the most demanding applications.
Custom control panel builds
Pre-plumbed valve assemblies
Integrated liquid analysis equipment
Integrated data-log and alarm equipment
Remote communications and controls
Custom fabricated vessels
AMSE coded vessels
High pressure vessels
Exotic alloys and materials