Headworks/Biosolids

Headworks/Biosolids
High-capture headworks screen

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Sludge scraping

The ZICKERT Shark sludge scraping system from WesTech Engineering has concave forward faces to transport sediment toward a sludge pit. During the return movement, wedge-shaped rear faces slide under the sludge blanket, providing uninterrupted transport. The system is designed for rectangular tanks and lamella plate clarifiers and works in all sedimentation processes, including grit chambers. It can be powered by hydraulic or electric motors and can be pushed or pulled, allowing flexibility in drive location. 801/265-1000; www.westech-inc.com.

 

Maximized belt pressure

The Sentry Press system from Charter Machine incorporates the company’s tower press arrangement, giving each pressure roll a minimum of 205-degree belt wrap, maximizing time under pressure. The three-belt press has a low gravity deck, but its discharge point is more than six feet from the base to accommodate conveyors or auxiliary equipment. A center-pivot design adjusts both sides of the belt simultaneously, promoting even stretching. All bearings are self-aligning, double-roll, spherical-roller type and come with quadruple lip seals. An independent speed control for the gravity deck is well suited to thin feed solids. 732/494-5350; www.chartermachinecompany.com.

 

Biosolids spreading

The ProTwin Slinger side-discharge spreader from Kuhn Knight has a twin-auger design and is available in truck or trailer models. A free-swinging hammer discharge provides an even spread pattern. Each hammer swings down into the material, peeling it off, pulverizing it, and slinging it underhand. The hydraulically controlled lower pan seals the discharge area during road travel, keeping material off the road and blocking the area from public view.

The scale system can be combined with the Digi-Star NT 460 Nutrient Tracker system with GPS capability to allow precise monitoring and documentation of application rates and locations to help comply with EPA and DNR regulations. 608/897-2131; www.kuhnnorthamerica.com.

 

Rotary screen

The rotary screen from FKC Co. is designed for continuous unattended operation in sludge thickening and influent fine-screening applications. Screen hole size and pitch are custom fit for the application, and multiple model sizes are available to handle flow rates up to 700-800 gpm for sludge thickening in a single unit and much higher flow rates for influent screening. The drum is supported and driven by a poly-coated shaft with stub ends, keeping all bearings outside the unit covers for easier and safer maintenance. External showers keep the screen holes clean. 360/452-9472; www.fkcscrew press.com.

 

Removing grit and grease

The Grit and Grease Removal System from Schreiber performs over a wide range of flows. The system is designed as a rectangular concrete channel with two parallel chambers. Effluent enters the grit channel where coarse-bubble diffusers create a continuous roll in the liquid. The spiral circulation scours, washes and deposits the grit into the bottom trough of the channel. A grit pump removes settled grit, and the slurry then flows to a grit classifier for further washing and dewatering before disposal. Grease attaches to air bubbles that provide buoyancy. Air/water lances spanning the width of the grease channel create a surface current that continuously transports grease to a removal screw. 205/655-7466; www.schreiberwater.com.

 

Sludge filtering

The Sludge Mate container filter from Flo Trend Systems is available in sizes from 3 to 60 cubic yards with dewatering capacities of up to 80,000 gpd. The tipping stands can be built for the application, such as dumping the cake into another container, into a dump truck, or onto a concrete three-wall pad. Walkways and handrails with ladders or stairways are available for cleaning and maintenance. A remote handheld control allows the operator to raise and lower the container for dumping accumulated cake and controls the opening/closing, locking/unlocking functions of the rear door. 713/699-0152; www.flotrend.com.

 

Grinding inline

The EZstrip TR Muncher from NOV Monoflo protects downstream equipment from blockages while allowing quick and easy inspection and maintenance without the need to disconnect pipework. The complete cutter stack can be inspected and replaced on site within 2 1/2 hours. Installation can be made with inline flanges or the option of tanker coupling connections. Cutters are specified to 8.0-mm, 5.5-mm and 3.0-mm thickness to match the optimum particle size for specific process requirements. Capacity is up to 1,938 gpm on raw sewage and up to 1,453 gpm on 4 percent solids sludge. 281/200-1200; www.ezstrip.com.

 

High-capture headworks screen

The Aqua-Screen in-channel perforated panel traveling belt screen from Andritz Separation can be adapted for channel widths up to 10 feet, depths up to 42 feet and the maximum head differential required for the application. The screen can handle up to 175 mgd with a single unit.

The unit operates intermittently; forming a solids mat on the face of the step-shaped panels until a preset upstream level or differential level is reached, signaling the screen to rotate. Solids are removed effectively at the top of the unit by means of a high-pressure bidirectional spray wash and an independently driven cleaning brush. The solids are then conveyed and dewatered by a screenings handling system with a capture efficiency of up to 85 percent. 800/433-5161; www.andritz.com/es.

 

Ultrafine filtration

The Baleen filter from JDV Equipment removes materials between 5 and 500 microns before effluent reaches a treatment plant’s membrane filters. The system does not require hot water to clean and is kept clear by a mechanism inspired by the Baleen whale. Before trapped suspended solids are allowed to accumulate and blind the screen media, high-pressure, low-volume sprays dislodge the material and sweep it away for collection. 973/366-6556; www.jdvequipment.com.

 

Automatic screening, grinding

The Dimminutor from Franklin Miller automatically screens and grinds wastewater solids in straight-through channels and wet wells. It reduces plastics, wood, rags and other solids to fine bits, improving the reliability of pumps and other downstream equipment. As its three bidirectional rotary cutters intermesh at close clearance with stationary cutters, solids are reduced to a size fine enough to pass through a sizing screen.

With no gaps or openings between the screen and cutters, output is controlled and complete reduction assured. The grinder’s open design handles high flow rates with low headloss. It has individually replaceable cutters, and its cantilevered design eliminates seals or bearings near the gritty channel floor. 973/535-9200; www.franklinmiller.com.

 

Sludge heating

The PSX inline sludge heater from ProSonix is designed for municipal, industrial, and food wastewater processing. There are no hot surfaces, eliminating problems with plugging and fouling. The inline design is suitable for high solids and difficult-to-pump fluids. The angled PSX jet diffuser eliminates rag issues. The steam injector’s diffuser produces 360-degree delivery of the steam for more uniform heating. 800/849-1130; www.pro-sonix.com.

 

Cake pump system

The BTH cake pump design from seepex allows flow rates up to 220 gpm at pressures up to 540 psi. An auger pushes the cake into the pumping element. The pitch, diameter and speed of the auger can be adjusted to match the application. A customizable open hopper along with system controls for dry running protection, load cell sensors, pressure gauge and boundary layer injection complete the system. The system has low capital, operating and maintenance costs and does not pulsate. A seepex MD range metering pump can be added to mix lime into the hopper to change the classification of the cake. 937/864-7150; www.seepex.com.

 

Grit pump

The PISTA turbo grit pump from Smith & Loveless is available in top-mounted vacuum-primed and remote-mounted flooded-suction configurations. It has a Ni-Hard volute and Ni-Hard recessed impeller, mounted completely out of the flow path of the abrasive fluid, with an oversized stainless steel shaft and bearings. The pump is available for both 4- and 6-inch arrangements. The top-mounted, vacuum-primed units eliminate excessive piping while lowering the head and horsepower. For suction-lift, the vacuum-primed units employ SONIC START Streamline prime sensing, which eliminates electrodes and reduces routine maintenance. 800/898-9122; www.smithandloveless.com.

 

Debris raking

The Deep Raker system from Fairfield Service Company is used upstream of a combined sewer overflow tunnel system’s pumps to screen large debris. The system removes the debris from the bar rack while the rake is ascending. The rake, powered by vector motor control technology, grabs debris instead of pushing it down. It uses a traveling dead plate for debris capture and can function in shafts up to 350 feet deep. 219/872-3000; www.fairfieldservice.com.



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