Treatment, Filtration And Desalination

Treatment, Filtration And Desalination
The ALDRUM G3 drum thickener from Alfa Laval

Interested in Filtration?

Get Filtration articles, news and videos right in your inbox! Sign up now.

Filtration + Get Alerts

Clarifiers/Components

Sedimentation basin floor cleaner

The SedVac sedimentation removal system for drinking water plants from Brentwood Industries cleans the sedimentation basin floor, removing solids without clogging, regardless of influent quality. Its header is designed to engulf and funnel the sludge blanket to the discharge hose. Powered by cable-drive technology along a guide track anchored to the basin floor, it can operate daily or continuously in plants up to 380 feet long. 610/374-5109; www.brentwoodindustries.com.

Molded clarifier access grating

Molded grating for clarifier access from Fibergrate Composite Structures is certified to NSF Standard 61 for potable water contact. It is available in numerous grating configurations and in many panel sizes, with various surface options. It is offered in NSF Standard 61 certified structural shapes, ladders and handrail systems for a complete solution. It is corrosion resistant and requires minimal maintenance. It is lightweight and easy to fabricate, while providing long service life and low life cycle cost. 800/527-4043; www.fibergrate.com.

Solids contact clarifier

Hi-Tech solids contact clarifiers from Kusters Water are used for water and wastewater treatment applications, including raw water intake, turbidity removal, cold lime softening, metals removal and other types of high-rate clarification. 205/987-8976; www.kusterwater.com.

Rapid gravity filter feedwater clarifier

The Clari-DAF clarification system from Leopold – a Xylem Brand for pretreatment of rapid gravity filter feedwater provides consistent water quality while operating at increased loading rates. It has low operating cost through optimized point of addition of all chemicals and optimized mixing energy. Its clarification technology removes low-density particulates as well as Giardia and Cryptosporidium. It reduces operation and maintenance costs through lower energy and chemical usage and less time to dewater. 704/409-9700; www.fbleopold.com.

Automatic sludge blanket level detector

The Automatic Sludge Blanket Level Detector from Markland Specialty Engineering helps drinking water plants monitor interface levels in clarifiers, upflow filter reactors and gravity settlers. It allows users to program de-sludge pumps to operate only when necessary, preventing carryover and optimizing feed density for improved filter press/centrifuge performance. A slim profile and high-intensity infrared light make it suited for obstructed or constricted areas. 855/873-7791; www.sludgecontrols.com.

Coagulants/Flocculants

Flash mixer

The InstoMix high-energy flash mixer from Walker Process Equipment disperses coagulant and other flocculent solutions into raw water. The flash blending of coagulant (within milliseconds) results in optimum floc formation and maximizes chemical economy. Units are constructed for flange mounting directly in the pipeline and are equipped with an internal-feed manifold to distribute solutions uniformly throughout the sectionalized mixer body. The in-line design allows a low energy input, low headloss and high G-Value result. The mixer can be custom-sized to produce a desired G-Value. Units are available for 8- to 72-inch pipelines. 630/892-7921; www.walker-process.com.

Desalination Filtration Systems

Stainless steel filter housings

Multi-cartridge, jumbo and bag filter stainless steel housings from Neologic Solutions are available with 3M epoxy coating for seawater applications. They are available in a number of sizes with flow rates up to 1,200 gpm in the multi-round jumbo housing. With V-band clamp or swing bolt closures, they are designed for quick cartridge change-outs. The heat-curable, fusion-bonded epoxy coating is sprayed onto preheated steel to create a uniform barrier against seawater or harsh chemicals. 855/896-3525; www.neologicsolutions.com.

Membranes

Pressurized membrane system

The MEMCOR CP II pressurized, pre-engineered membrane system from Evoqua Water Technologies has a modular building-block configuration and compact footprint. It uses PVDF UF membrane technology and has design enhancements that reduce installation costs, improve system performance and simplify operations. It is suited for new installations and facility upgrades. It combines durable materials and reusable housings with easy module access that reduces maintenance and delivers value over the system life cycle. 866/926-8420; www.evoqua.com.

Polymers/Components

Drum thickener

The ALDRUM G3 drum thickener from Alfa Laval increases solids load capacity up to 30 percent within the same footprint as the company’s standard unit. The feed zone provides lower polymer consumption, while power plates reduce power consumption by the decanter centrifuges. The Slimline design of the centrifuges and a smaller conveyor diameter provide room for more liquid in the pond and higher bowl wall pressures for a drier cake. 866/253-2528; www.alfalaval.us.

Pretreatment Chemicals

Sodium chlorite

ADOX Sodium Chlorite from DuPont Clean Water Technologies is used in generating chlorine dioxide using DuPont MG III generators. Chlorine dioxide has highly selective oxidizing properties that enable lower dosages. It remains a truly dissolved gas in water and retains its useful oxidative and biocidal properties throughout a broad pH range (2 to 10). It does not chlorinate organics to form halogenated disinfection byproducts. It is approved for use by the U.S. EPA and the World Health Organization. 302/999-2709; www.dupont.com.

Dry chemical feeder

The stainless steel volumetric Dry Chemical Feeder from Eagle Microsystems uses direct drive to ensure optimum performance and durability in harsh environments. With no external gears, pulleys, chains, belts or lubrications, it is user-friendly and low-maintenance. Chemical feed is controlled by electronic SCR speed control for accuracy. It is customizable to fit any process. 610/323-2250; www.eaglemicrosystems.com.

Sodium hypochlorite generator

The SciCHLOR Sodium Hypochlorite Generator with SciCELL technology from Scienco/FAST automatically produces chlorine on demand using a recirculation method to concentrate the brine and allow the system to run at optimum salinity and increase power efficiency. Available in capacities from 10 to 60 pounds of produced hypochlorite per day, it generates an optimal 0.8 percent sodium hypochlorite solution using salt, water and electricity. It includes an integral brine tank, chlorine storage tankage, control panel, multi-pass SciCELL unit and recirculation pump. 866/652-4539; www.sciencofast.com.

Reverse Osmosis

Composite solenoid valves

The 212 Series of composite solenoid valves from ASCO Numatics incorporate the FasN universal connection system. They are designed for water purification and conditioning systems in commercial and industrial applications. The valves are rated at up to 150 psi and 180 degrees F. The durable, lightweight engineered plastic bodies are tested to achieve up to 1 million operating cycles. The valves are suited for use in midsize reverse osmosis systems where lead-free and NSF-approved constructions are required. 800/972-2726; www.ascovalve.com.

Dow reverse osmosis elements

Filmtec ECO reverse osmosis elements from Dow Water and Process Solutions combine membrane chemistry and low dP feed spacers for lower energy costs and reduced chemical consumption when RO is followed by a mixed-bed ion exchange unit. The elements, available in ECO-4001 and ECO-440i configurations, are designed to deliver up to 40 percent lower salt passage with up to 30 percent less energy input. www.dow.com/liquidseps.

Reverse osmosis pressure pump system

The SALINO Pressure Center from KSB combines a high-pressure pump, energy recovery device, booster pump and electric motor in a compact reverse osmosis system. Few working parts mean low initial cost and maintenance expense. The system’s integrated energy recovery provides efficiency. Its plug-and-desalt design allows straightforward, fast installation and operation. Oil-free, water-based lubrication and proven axial piston technology make it reliable, safe and environmentally friendly. 804/222-1818; www.ksbusa.com.

Reverse osmosis control system

RO WISE water process controls from PRIMEX Controls combine control hardware platforms with Process PRO modular program architecture to provide process control, data storage, and remote monitoring and operation for reverse osmosis applications. Systems include an HMI main touch screen offering easy operation, flexible configurability, continuous process variable monitoring, normalization data, language selection, real-time units conversion, cycle counts and run times for all valves and pumps. Data storage tracks trends for process variables and changes to system settings. With Internet access at the site, the system offers remote monitoring, access to trend data, and email and SMS messaging of alarms. 844/477-4639; www.primexcontrols.com.

Sand/Membrane/Ion Exchange/Activated Carbon Filtration Systems

Small-particle filter cartridges

LT2 cartridges and housings from Harmsco exceed the three-log (99.9 percent) removal requirement described in the LT2 ESWTR Toolbox Guidance Manual 8.4.1 for cyst-sized particles. They can control Cryptosporidium, Giardia and other pathogens. 800/327-3248; www.harmsco.com.

Hollow-fiber ultrafiltration

The TARGA II hollow-fiber ultrafiltration system from Koch Membrane Systems fits drinking water, RO pretreatment, tertiary wastewater treatment and other applications. Designed with the Safe Drinking Water Act and World Health Organization guidelines for drinking water in mind, it provides greater than 4 log removal of bacteria, viruses, Cryptosporidium and Giardia. Fibers have smooth inner core morphology and small pore size, allowing pathogens to be trapped and swept away. 888/677-5624; www.kochmembrane.com.

Carbon filtration process

The ACTIFLO Carb process from Kruger facilitates removal of natural organic matter (NOM), taste and odor compounds, endocrine disruptors and pesticides with the combined benefits of ballasted clarification and the adsorption capacities of powdered activated carbon (PAC). It can be applied to drinking water and wastewater and operates in a small footprint. Since the PAC is recycled within the process, dosages are reduced and the solids handling capabilities allow for high concentrations of PAC to be maintained in the system. The process is adaptable to changes in raw-water quality by modifying the fresh PAC dose. The process train can be used with or without PAC based on seasonal demands. 919/677-8310; www.krugerusa.com.

Diatomaceous earth filter

Vacuum diatomaceous earth filters from Separmatic are easy to operate and maintain. Tank flushing is required approximately every two weeks, assisted by the reciprocating spray bars and internal flush system. The unit can be operated by unskilled personnel. Aside from infrequent filter element fabric replacement, maintenance is minimal. Units are available in capacities as low as 5 gpm and can be skid or trailer mounted for portability. Tanks are constructed of stainless steel in 304 or 316 material. 414/466-5200; www.separmaticsystems.com.

Ion exchange treatment resin

The NutrIX-P ion exchange treatment process from Tonka Water uses a specialty formula to treat phosphates. It is a macroporous styrene/divinylbenzene copolymer with enhanced quaternary amine functional groups supplied in chloride form. 763/559-2837; www.tonkawater.com.

Ultrafiltration membrane treatment system

The AltaPac ultrafiltration membrane treatment package system from WesTech Engineering can process flows up to 100 gpm on surface water and 180 gpm on groundwater. It can be upgraded by adding a module and changing the flow setpoint. Systems are fully functional, self-contained skids that have all of the features and benefits of the full-scale AltaFilter, including automated operation and daily integrity tests. They contain all the components for a complete and operable water treatment system. 801/265-1000; www.westech-inc.com.

Screens/Screening Systems

Underdrain system

The Phoenix underdrain system from AWI has stainless steel construction, a low-profile design, a bolt-together system for easy installation, and direct retention to eliminate gravel for filter media support. Each air and water orifice is sized using a computer program, assuring uniform distribution throughout the filter. A separate air and water channel eliminates wave action in the laterals and air header. 801/566-1700; www.awifilter.com.

Bar screen

Bar screens from Hendrick Screen Company include a passive water intake screen, flat intake and fish diversion screens, header laterals and pipe laterals, sieves and strainer screens. They are constructed from 304 and 316L stainless steel and copper-nickel, and are ISO 9001:2008 certified. 270/685-5138; www.hendrickscreenco.com.

Filter media scouring unit

Modular Air Scour units from Unifilt Corporation don’t require the removal of filter media or underdrain replacement. Laser-cut microslits resist clogging to help reduce maintenance and system failures. Retrofit options are available. Units are made of 304 stainless steel. The system includes a diesel-powered blower with automated controls, temporary piping and anchorage, as well as comprehensive operator training. It exceeds AWWA B100-09 and is listed under NSF Standard 61. 800/752-3899; www.unifilt.com.



Discussion

Comments on this site are submitted by users and are not endorsed by nor do they reflect the views or opinions of COLE Publishing, Inc. Comments are moderated before being posted.