Treatment and Filtration

Treatment and Filtration
Automatic scraper-strainer

Self-cleaning screen filter

The Amiad EBS automatic self-cleaning screen filter delivers reliable, nearly maintenance-free protection of downstream membranes, disinfection systems or water reuse systems. With screens from 800 to 10 microns and flow rates to 23,350 gpm, the unit can be the foundation of a multi-stage filtration system.

When a target pressure differential is reached between the clean and dirty sides of the screen, a flush valve opens to atmospheric pressure, causing water to flow through nozzles that direct its force through one square inch of screen at a time, dislodging the filter cake. The nozzles scan the screen in a spiral pattern, cleaning its entire surface without interfering with filtration. Because of its high-efficiency suction scanner technology, the filter uses up to 75 percent less backflush water than a comparably sized sand media system, draws minimal power, requires no chemicals, and occupies an extremely small footprint. 800/969-4055; www.amiadusa.com.

 

Automatic scraper-strainer

ACRS automatic scraper-strainers from Acme Engineering Products remove solids and large particles using only dirty water for blowdown, unlike conventional backwash strainer designs. The strainers are available in sizes up to a 66-inch body in steel or corrosion-resistant metals. Screens are available down to 75 microns to cover a broad range of straining requirements. Jacketed bodies are available for viscous liquid applications. The strainers are custom-fabricated to engineers’ or plant specifications and can be designed to fit in existing conventional strainer locations, avoiding costly piping rework. 514/342-5656; www.acmeprod.com.

 

Blower packages

Kaeser has launched two additions to its Com-paK Plus blower packages. The EB 291C and EB 421C models have reduced footprints and offer side-by-side installation. The packages feature tri-lobe blowers, and low noise and vibration. An enhanced airflow design improves efficiency and heat removal. The series has advanced control options, including the Omega Control Basic, variable-frequency drive and reduced current (wye-delta) starting.

All instrumentation is mounted, piped and wired. The controller integrates motor starters and instrumentation, reducing installation cost and increasing reliability. Dry contacts are included for output to SCADA, and the packages can be remotely started and stopped. Units are available from 25 to 100 hp and with flows from 577 to 1,420 icfm at 4.4 psig. 877/596-7138; www.kaeser.com/omega.

 

Surface mechanical aerator

The Aqua-Jet surface mechanical aerator from Aqua-Aerobic Systems is approved by Underwriters Laboratory (UL) to meet ANSI/NSF Standard 61 requirements for potable water applications. The approval includes seven horsepower sizes from 1 to 15. The units are designated as model SS-PW and can be used for TTHM stripping applications, or circulation in potable water treatment systems and reservoirs with a minimum volume of 100,000 gallons. 800/940-5008; www.aqua-aerobic.com/aquaJet.asp.

 

Analyzer

The CARUTEST Analyzer from Carus Corporation is designed to continuously measure residual levels of CAIROX potassium permanganate or CARUSOL liquid permanganate in drinking water. It measures residual levels via an amperometric cell. The unit is keypad-operated and uses simple, menu-driven instructions. It also has an auto-scalable output, eliminating output calibration after range selection. An Auto Zero function is standard. Electrodes are kept clean by a continuous motor-driven mixer and plastic spheres. Hi-Lo alarms can be adjusted from 0 to full scale. 800/435-6856; www.carus corporation.com.

 

Molded belt press seals

Compositech’s molded belt press seals are made of one solid piece of cast urethane, eliminating failure from the joining of two pieces. All seals are made at 75 durometer to create an unyielding seal. The company offers a wide variety of seals including upper- and lower-transversal, lateral, wedge and wash box seals. 281/648-3557; www.compositech-filters.com.

 

Turbidity monitor

The Hach FilterTrak 660sc gives confidence that small changes in turbidity measurements accurately represent real turbidity events by detecting turbidity changes as low as 0.0003 NTU. Operators can detect impending filter breakthrough, delineate filter ripening, and maximize effective filter run time.

Using advanced laser optics and signal processing, the instrument detects submicron particles that are often precursors to larger particles. This allows detection of early filter deterioration. The device uses the U.S. EPA-approved Hach FilterTrak Method #10133, the method specified in the U.S. EPA LT2 draft guidance manual for compliance monitoring of membrane filters. The sensor meets all regulatory requirements for individual filter and combined effluent monitoring. 800/227-4224; www.hach.com.

 

Filter control system

Filter Magic from Industrial Control Systems Inc. is a simple control system that eliminates or minimizes complexity. The touch-screen Operator Interface Terminal eliminates physical control switches, pushbuttons, pilot lights and instrumentation normally associated with a filter console.

It also reduces the overall console size substantially. Using AS-I bus network technology greatly reduces I/O, console wiring complexity, terminations, and field wiring. Pneumatic vane actuators with only one moving part simplify the mechanical aspect of the filter control system. The unit reduces installation cost by up to 40 percent and also saves on maintenance. 804/737-1700; www.ics-cwt.com.

 

Mobile treatment solution

PureLine offers treatment systems in sizes from 10 to 120 pounds per day capacity. Each streamlined unit produces 99.5 percent pure, chlorine-free chlorine dioxide with safe and reliable performance using remote on-off dosing pump control.

Other features include color touch screen operator interface terminal (OIT) and integrated programmable logic controller (PLC) capability. The units are operated and supported by the PureLine field service engineering department. Mobile systems allow users to quickly evaluate chlorine dioxide as a replacement for underperforming treatments for disinfection byproduct (DBP) reduction. 847/963-8465; www.pureline.com.

 

Submersible mixer

The SolarBee GS-12 high-volume submersible mixer mixes potable water storage tanks of a wide size range, ensuring uniform distribution of disinfectant, preventing stratification and providing uniform water age. At 40 percent of the cost of comparable mixers, the electric-powered, low-voltage mixer pulls water off the tank floor for the most efficient mixing of important boundary layers.

Measuring 36 inches long and 11.5 inches in diameter, the unit is lowered through a 12-inch or larger hatch. There is no need to enter or drain the tank. Low-impact feet and end caps will not damage tank coatings during installation or operation. A ground-mounted control box includes optional SCADA outputs and is UL-listed. The mixer is compatible with SolarBee’s optional Chlorine Boost and THM Removal Systems to ensure optimal water quality and to meet the upcoming EPA Stage 2 Disinfection Byproducts Rule. 866/437-8076; www.solarbee.com.

 

Glass fiber filter

The 934-AH borosilicate glass fiber filter from Sterlitech Corporation is used to establish water quality in suspended solids content and meets all criteria for measuring suspended solids in water and wastewater as determined by Standard Method 2540D and EPA Method 160.2. The binderless borosilicate microfiber enables use with volatile suspended solids and other samples up to 550 degrees C. The filters feature a 1.5 micron particle retention and are available in a variety of diameters. 877/544-4420; www.sterlitech.com.

 

UV system

The TrojanUVSwift from Trojan Technologies is available in multiple inlet/outlet diameters, and is well suited for drinking water disinfection in new and retrofit applications for a wide range of flow rates. The system is upgradeable to models designed to treat the compounds responsible for seasonal taste and odor events (e.g. MIB and geosmin) and other chemical contaminants. Known as the TrojanUVSwiftECT (environmental contaminant treatment), the system uses specialized controls with hydrogen peroxide to cost-effectively perform UV oxidation. 888/220-6118; www.trojanuv.com.

 

Filtration system

The WWETCO FlexFilter from WesTech uses a synthetic compressible media to capture solids in a high-rate filtration process. Rising influent applies hydrostatic force to the outside of tapered flexible bladders, causing the media in the bladders to compress loosely at the top of the filter, with a tighter porosity gradient through the depth of the filter.

The tapered compression provides for a densely compacted media bed at the bottom of the filter that graduates to an expanded bed toward the surface. As the liquid flows over the top of the bladders and into the media bed, larger particles are trapped in the upper portions of the filter. As the liquid works its way down through the media, the smaller particles are captured. The filter is a simple gravity system with a robust design requiring no moving parts. The backwash system uses an air scour with a high-energy wash cycle and specialized backwash troughs to minimize the volume of backwash water. 801/265-1000; www.westech-inc.com.

 

Mobile dewatering

Mobile dewatering systems from Flo Trend Systems provide flexibility to dewater sludge at the water plant. The trailer-mounted dewatering boxes come in sizes from 3 to 40 cubic yards and can be equipped with a polymer make-down system, generator and sludge pump. Dewatering box options include a pintle hitch, gooseneck or fifth wheel towing, a side-to-side rolling vinyl coated nylon tarp or peaked roof and hatches, and a hydraulically controlled rear door. 800/762-9893; www.flotrend.com.

 

Mixing systems

Amaprop mixers from KSB use a new base with a single-unit cast of proprietary NoriRoc composite, a lightweight material with five times the strength of concrete. A single operator can position the base during installation. Guiderails to 30 feet are available and do not need an upper support bracket. Wet installation is possible. The NoriRoc absorbs vibration eight to 10 times better than steel, ensuring smooth, quiet, efficient operation. 804/222-1818; www.ksbusa.com.

 

Slow sand filter

The Manz slow sand filter (MSSF) and Manz polishing sand filter (MPSF) from Oasis Filter International use a backwash process that limits the depth of the filter bed, since scraping and resanding are not required. The MSSF filters water with suspended solids loads that would otherwise be impractical. The MPSF exploits the capability of slow sand filters to remove very small particles including microflocs of iron hydroxide, manganese hydroxide and other hydroxides and substances such as arsenic. Low doses of coagulant may be added to improve filter performance. 403/269-1555; www.oasisfilter.com.

 

Sludge and slurry press

Sludge and slurry dewatering systems from Prime Solution use the continuous pressure differential technology of the rotary fan press. The systems use slow rotational speed (less than 1 rpm), in low-maintenance, energy-efficient, portable, space-saving, and expandable packages. Capacities are available to meet flow applications of all sizes.

The simple design allows easy installation. Skid-mounted systems include a central operator control panel, feed pump, chemical prep, inline mixing, and plant-integrated controls. Designs are easily tailored for mobile systems. 269/673-9559; www.psirotary.com.

 

Nozzles and strainers

Orthos Liquid Systems offers filter nozzles/strainers for water treatment. Components are available to suit false plate, pipe header/lateral and concrete underdrains used in rapid gravity sand filters and GAC adsorption. Retrofits are available to fit any OEM nozzle. 843/987-7200; www.orthosnozzles.com.



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