EIMCO Clarifiers... Customized Designs to Match Unique Specifications Most standard or special sedimentation/clarification requirements can be accommo

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1 EIMCO Custom Clarifiers Efficient Clarification and Sedimentation of Wastewater

2 EIMCO Clarifiers... Customized Designs to Match Unique Specifications Most standard or special sedimentation/clarification requirements can be accommodated by our experts. Mechanisms to achieve desired results can be easily adapted from designs of specialized treatments units at existing installations. A custom clarifier can be designed with elements drawn from existing clarifiers to suit current unique application requirements. Experience gained through 50 years of service, testing, research, and thousands of installations, enables us to design efficient and reliable mechanisms tailored to your needs. An experienced service organization is available to provide the support you require, including complete field and laboratory testing to assure proper component selection, and structural and process calculations. Options to various basic configurations allow flexibility to match most treatment needs. Experience and expertise in designing for unique requirements has equipped us with the knowledge to produce units tailored to special situations. Laboratory testing and years of empirical experience enable our engineers to design the "one-of-a-kind" units often needed when an unusual circumstance occurs. Some of the innovative clarifier designs we have produced over the years are shown in this brochure. Basic configurations include: square basins with special corner-sweep rake arms; special suction sludge return; special drive adaptation; and special skimming designs. Clarifiers provide continuous separation and removal of suspended solids from wastewater at minimal cost. 2

3 Center Column Mounted Customized Clarifiers EIMCO Custom Clarifier Types EIMCO clarifiers are easily adaptable to special designs. In addition to standard optional features, our engineers will design and develop new features necessary to satisfy special application requirements. This may necessitate concepts never before incorporated in a clarifier, or may combine features in a new configuration. Whatever the special requirement of the installation, we will provide a design to suit user needs. EIMCO Type C3 and C3S Units EIMCO Type C3 units can be used on either primary or secondary clarification, while Type C3S units are normally used only in secondary activated sludge treatment applications. Both units are identical except the Type C3S units have sludge withdrawal pipes to recycle activated sludge to the aeration basins. Description Type C mechanisms are supported by a center column which carries the full operating load of the clarifier. A stationary walkway extends from the side of the basin to the platform over the center column for access to the drive unit. Influent can be introduced to the center feedwell through a pipeline beneath the basin and up through the hollow center column, or supported from underneath the walkway. Sludge removal rake arms with blades and squeegees are attached to a center cage supported from the rotating main gear of the drive. Sludge withdrawal pipes provide a controlled highvolume, continuous removal of activated sludge to aeration basins. Sludge is collected just above the clarifier tank floor. Optimum sludge return rate is easily controlled from the operating platform. This table defines options available for the basic Type C clarifiers. All of these can be further modified to produce unique designs of a specialized nature. 3

4 EIMCO Custom Clarifiers - Corner Sweep and Flocculator Types Corner Sweep Clarifiers for Square Basins Types C3C and C3SC Description Reduced plant construction costs are often realized from economies obtained by using square basins. EIMCO Types C3C and C3SC clarifiers utilize the same drive unit and component design as the basic EIMCO Type C3 clarifier, except they are fitted to a square basin. Either cross flow or center feed with peripheral overflow can be employed. To provide complete sludge removal from all parts of the basin, the sludge-raking arms have pivoted pantograph-action extensions attached to their outer ends. Corrosion-resistant wheels mounted on the extension arms ride against steel plates embedded in the sidewalls and guide the outer scraper blades. Corrosion resistant torsion springs in the pivoting extension arms keep them in contact with the wall at all times. Counter-weights, cables, sheaves and other mechanical devices which would require periodic maintenance are eliminated. Flocculator Clarifiers...For Improved Settling Types C3F and C3SF Description By oversizing the feedwell and adding flocculators, influent can be gently agitated to promote flocculation and more efficient settling. Feedwells are sized to provide influent detention for enhancing the formation of the flocculated particles. Flocculating clarifier feedwells are generally designed for the maximum depth allowed by the rotating mechanisms and are supported from either the walking platform or center cage. Variable speed flocculator drives permit adjustment to optimize operation over the range of expected influent volume. Type CF Description Stacked concentric dual drives allow vertical flocculating paddles to counter-rotate in the feedwell, resulting in thorough but gentle mixing of feed stream. The slow speed clockwise-moving paddles attached to the rake arms pass between the counter- clockwise-rotating turbine paddles to create mixing eddys in the flocculation well to promote complete energy distribution without high localized shear. These units are particularly well suited for bio-flocculation and for light to medium strength floc. Bridge-supported, dual-drive flocculating clarifiers and diffused air flocculating clarifiers are also available. 4

5 Large Diameter Feedwell Clarifiers... For Improved Performance Types C3LF and C3SLF Description Removal of suspended solids can be improved by as much as 20% with the addition of a large diameter feedwell to the basic EIMCO clarifier. Shortcircuiting in the basin is reduced and volumetric efficiency improved by increasing the diameter of the feedwell to half the diameter of the basin. After pioneering the use of large diameter feedwells, we now have extensive experience in their application. Feedwells are generally supported from the basin wall. Radial launders are often employed to decrease the weir overflow rate. Flow enters the feedwell at a controlled low velocity, providing effective dissipation of the influent energy and greatly reducing surface turbulence. Scum removal is performed within the feedwell using an efficient skimming device. We will design to most special requirements. Our team has installed many one-of-a-kind clarifiers. Experience with thousands of customized units in operation can be referenced for design consideration. Custom Clarifiers can usually be tailored for a new application with slight modifications to existing designs. 5

6 Special Designs... For Unique Applications We Have the Solution to Your Problems Our capabilities extend beyond adding standard modifications to produce customized units. On many occasions, unique situations require innovative ideas for "one-of-a-kind" customization. Our process and equipment engineers possess the technological expertise and design experience to develop features never before incorporated into clarifiers. Examples of a few of the innovative concepts put into practical application are shown in the photographs on these and the following pages. Contact your local representative for all your clarification needs. Our company has supplied clarifiers in excess of 200 feet in diameter Hydraulic differential clarifier with surface trough for sludge removal Large diameter feedwell with radial effluent launders and feedwell skimming Special collector mechanism designed for 1,000,000 foot pounds torque with energy-dissipating feedwell 6

7 Special Designs... For Unique Applications Suction return clarifier with sludge header and manifold Mechanism in peripheral feed unit with four rake arms and suction return pipes Our engineers meet design challenges with thoroughness and expertise Extensive experience in the design of customized clarifiers for liquid/solids separation have made EIMCO mechanisms the best combination of rugged dependability and economy available. In addition to advanced features, EIMCO clarifiers are designed to make field assembly quick and easy. Drives, developed to also be suitable for extreme industrial service and mining applications, assures optimum performance with minimum attention to maintenance. Heavy-duty gears and bearings are incorporated into all machines for highest dependability and life. All components are designed to carry the full torque rating, and each unit is carefully constructed to provide years of trouble-free service. 7

8 Skimming Mechanisms... For Use on EIMCO Clarifiers Description Floating solids can be removed by either of two EIMCO skimming mechanisms; adaptable to the basic EIMCO clarifiers. The first design consists of a rotating collector mechanism which moves floating scum into a fixed box mounted at the tank wall. The second skimming design consists of a radically fixed scum pipe with a scum receiver opening the length of the pipe. By rotating the pipe with either a manual or automatic operator, the opening is dropped below the surface of the liquid. A skimmer blade attached to the rotating collector mechanism moves the floating scum to this stationary pipe where the scum is drawn into the opening. When the skimmer blade contacts the pipe, it ducks below the surface of the liquid and returns to its to its upright position after traveling under the pipe. Scum from the feedwell to the tank wall is therefore removed with each revolution (or operator selected/ programmed revolutions) of the rotating collector mechanism. 8

9 EIMCO ClariThickener Description In many wastewater treatment plants it is desirable to provide both clarification and sludge thickening. There is no question as to the advantages of sludge thickening prior to digestion, filtration, incineration, or other methods of sludge disposal. But the costs associated with installing two separate units, and the additional space required, tend to offset the advantages and pose a question as to whether both should be included in a flowsheet. EIMCO ClariThickener clarifier-sludge thickeners provide an economical solution to this dilemma. Although slightly higher in initial cost than either a clarifier or a sludge thickener, the ClariThickener is MUCH less expensive to install and operate than the two separate units. The efficient single-basin design costs about 25% to 40% less to install, requires less labor and power to operate, and takes only about half the space of the two separate units. BENEFITS EIMCO ClariThickeners Clarifier versus Conventional Clarifier and Sludge Thickener Consumes less space Lowers installation cost Lowers operating costs Creates simplified flow pattern Requires less operating labor Prevents septic conditions and odors 9

10 ...Sludge Thickening and Clarification in a Single Basin Operating Principle Wastewater enters the ClariThickener center feedwell as in a conventional clarifier. Settleable solids are deposited directly in the sludge thickening well and outer tank bottom. An oxidative liquor inlet diffuser, mounted on the center column just above the thickening zone, provides septicity control. Thixo posts in the sludge thickening well gently stir the sludge to facilitate release and upflow of gases and liquids. The volume of the sludge thickening well is adequate to hold settled sludge from 12 to 24 hours, depending on process requirements. During this sludge retention period, the oxidative liquor diffuser maintains semi-aerobic conditions over the thickening well. Clarified effluent, floating solids, and scum are removed from the surface by conventional methods. 10

11 EIMCO Clarifier Driveheads... Designed for Maximum Duty Service We have over 60 years' experience in gear design and manufacture, combining municipal technology with heavy-duty industrial performance requirements. Knowledge gained from thousands of minerals processing and other high-demand applications enable us to produce reliable and economical driveheads for superior performance in water and wastewater treatment applications. Information on file in our technology center from this experience and extensive laboratory analysis, enables us to size drives for each specific set of process requirements. Drives are designed for long, trouble-free life, dependable service, and economical operation. Light duty, single pinion drive Heavy duty, dual pinion drive Torque overload drive protection device Drive Type Specifications We build superior drives. When specifying a drive, it should be recognized that the critical requirement is NOT the internal configuration but the STRENGTH of WEAR RATINGS of the drive. The engineers' specification should require detailed drive calculations (AGMA standards) and field torque tests. Drive specifications should be confirmed by submittal calculations and by field torque compliance tests under supervision of the consulting engineer to verify the structural integrity of the mechanism. We have built thousands of sedimentation drives for over 60 years in a variety of types, sizes, and styles. Many improvements have been made in EIMCO drives over this period of time. EIMCO drives often exceed other suppliers' rating for similar sized units. It cannot be overemphasized that strength and wear rating, with an appropriate service life (years or cycles), be specified rather than component dimensions and internal materials of construction. Superior EIMCO drives, incorporating advanced technology, will probably exceed torque and other performance criteria in a smaller configuration than might be available in larger competing drives. Our experience in drive design assures that the specified torque rating and quality will be equal to the task to be performed. Features of EIMCO Drives Optimum output torque range to accommodate loads Maximum service life without component failures Supports mechanism and operating loads High reserve strength Optimum rotation speed for service requirement Reliable overload protection 11

12 EIMCO Custom Clarifiers In addition to providing a complete line of process equipment, Dorr-Oliver Eimco is your source for everything necessary to meet the total needs of a project from inception to start-up and beyond. Flowsheet Capabilities Dorr-Oliver Eimco engineers can help you with the design of your total flowsheet, ensuring that all your equipment will work together for optimal performance and ease of operation. Tankage and Erection Dorr-Oliver Eimco can take the stress out of coordinating an independent contractor who may not be familiar with all the details necessary to install your thickener or clarifier. Our experienced tankage and erection crews can save you money and stress by doing all your field work and turning over to you a trouble-free machine. Upgrades and Retrofits Clarification and sedimentation technology is constantly advancing. Let us show you how you can incorporate state-of-the-art design improvements into your existing clarifier or thickener. Many upgrades can pay for themselves in a matter of months and help increase capacity as well as improve performance. Service Our staff of skilled mechanical and process engineers can keep your Dorr-Oliver Eimco equipment in top condition and help you avoid costly unscheduled interruptions. Dorr-Oliver Eimco is here to help you with all your solid/liquid separation needs. Please call us to find out more about how Dorr- Oliver Eimco technology can improve your productivity. In the U.S., please call and in Canada, call For a complete listing of our worldwide locations and regional phone numbers, visit U.S Canada Copyright 2004 GL&V. DOE 3195 AC. Printed in U.S.A.