Mip thickeners and clarifiers can be supplied for a variety of applications from mineral processing to water treatment. Sludge thickening an overview sciencedirect topics. Del mobile clarifier and thickener tanks del corporation. Bridgesupported mechanisms for tank diameters to 50 feet. Thickeners are beneficial in a variety of applications, including areas where water is in short supply or very expensive, recirculated water is not suitable for reuse in a plant, ponds are located on minable reserves, or ponds must. Outotec thickeners and clarifiers operate in minerals processing, alumina, chemical, water treatment.
Enviroclear manufacturer of clarifiers, thickeners, horizontal belt vacuum filters, pronto pressure filters, linear screens, and replacement drives. Thickeners circular thickeners are a crucial step between upstream process clarifiersseparators and downstream dewatering and sludge conditioning processes. Central driven clarifiers for circular or square bottom basins peripheral drive clarifiers for circular basin suction arm clarifiers clarifiers for rectangular tanks with travelling bridge or hydraulically operated type reactor clarifiers conventional thickeners central drive sludge. Takraf, a tenova company, is an integrated solutions provider to the global mining, bulk material handling, minerals processing and bene. Outotec thickeners and clarifiers operate in minerals processing, alumina, chemical, water treatment, industrial and effluent applications throughout the world. A design method for thickeners and clarifiers known as the batch flux curve technique was developed over 20 years ago, but still is not wellknown in design and operating circles. Tank construction standard designs are available for concrete or steel tankage. Thickeners and clarifiers can be designed to operate in either batch or continuous mode, although most commercial operations utilise the latter. Clariflocculator peripheral drive peripheral drive rake arm rotating bridge floc drive slip ring turn table overflow weir. Launders inboard and outboard arrangements are available and either may be utilized. Thickeners and clarifiers to exceed the demands of the modern process plant, in keeping with our goals of reducing overall cost of ownership through technology. Every unit includes a worm, planetary, helical or spur gear drive unit designed in accordance with current agma or iso.
An informal survey of major clarifier and thickener manufacturers found that none of the firms surveyed use this method for sizing and maximizing operating conditions. Our main product offeringis the high rate thickener hrt which has several special features that provide advantages over conventional thickeners. Pdf the common thickener underpins the performance of most. Ultra high capacity uhc clarifiers provide very high flow, high tonnage capacities, low maintenance, a small footprint, and are preassembled to minimize installation time. Thickeners as well as clarifiers are both used to separate liquids and solids by settling process with only one difference i. Removal efficiencies, detention times, and other parameters have been summarized to provide a handy reference. Conventional thickeners these thickeners differ in the way they are built. The solids were then allowed to settle as long as required, the top liquid was decanted, the settled solids. Thickeners and clarifiers complete range of reliable and cost. A guide to understanding and mixing thickeners rheology modifiers, commonly referred to as thickeners or viscosifiers, are everpresent in most products.
The early methods of thickening employed plain, flatbottomed tanks into which the pulp was fed until the tank was full. Dissolved air flotation daf clarifiers and thickeners overview. Gravity clarifiers sewage treatment reverse osmosis. Thickeners are used to concentrate solids, while clarifiers are used to purify liquids. Highrate thickeners, or clarifiers, recover immediately reusable process water for mineral and aggregate producers, as well as environmental contractors. A liquid feed with suspended solids is fed into a tank with a diameter of 5 to 500 feet. Our thickener and clarifier product range has been tailored to the specific duty requirements of. Thickening is a process where a slurry or solidliquid mixture is separated to a dense slurry containing most of the solids and an overflow of essentially clear water or liquor in leaching processes. Thickenersclarifieraerators home application thickenersclarifieraerators objectives of biological waste water treatment are to stabiilize the organic matter and to reduce the amount of dissolved phosphorus and nitrogen in the final effluent. A well designed thickener provides storage and equalization, and reduces the costs associated with dewatering. Optimal control of clarifierthickeners diva portal.
Fundamentally, thickeners and clarifiers are both used to settle solids which. Clarifiers and thickeners cst wastewater solutions. Benefits of the component plan competitive price specifying eimco water tecchnologies component mechanisms means you get a proven clarifier. Clarifiers are settling tanks built with mechanical means for continuous removal of solids being deposited by sedimentation. As the particles settle, angled rake arms move the concentrated slurry toward the center of the tank, where it is removed. Request pdf mud thickening in sri clarifiers the throughput capacity of a clarifier is based on its ability to perform the twofold functions of clarifying the juice, and thickening and. Concentrated impurities, discharged from the bottom of the tank are known as sludge, while the particles that float to. This page provides information on the expected performance of primary and secondary clarifiers.
Our clarifiers recover nearly 95% of the water from process slurry while maintaining the highest underflow density in the industry. The tank is built in 2 sections, an upper and lower section, for ease of transport. Such layers are very stable and form a cap on the ct. Clarifiers brochure pdf drive mechanisms for circular clarifiers brochure pdf questions. The sludge thickener must have sufficient capacity to accumulate and thicken the sludge between filter press cycles.
Mep ltd supplies a comprehensive range of thickeners and clarifiers to satisfy most requirements and the designs are continually updated to meet todays standards and requirements. Dissolved airnitrogen flotation is used in applications where the specific gravity of the solids. This fine network creates a great deal of surface area on which very. Long term sludge storage in clarifiers should be always avoided, since it results in a substantial portion of the biomass being held in the clarifier in a relatively in active state, rather than in the aeration tank, where oxygen and. Difference between clarifier and thickener 911 metallurgist. More specific details of design are available in akers 1974, dixon 1979, fitch 1966, 1975, gough 2005, hasset 1965, kos 1974, kynch 1952, talmage and fitch 1955, wakeman and. The dewatering performance of the ct then deteriorates under these conditions, and a. High rate thickeners clarifiers enviroclear company, inc. For bridge mounted drive heads rake lift is through a torque tower which is bolted to the main wheel and drives the rake shaft through a keyway. Of course, every wastewater plant is different, with potentially vast differences between municipal and industrial wastewater. The bridge support clarifiers are used as primary wastewater treatment.
Thickeners are similar to other circular clarifiers in appearance and. Thickeners are simple, reliable, effective and efficientunder the right conditions. Liquid sludge pumped from a clarifier will have a solids content of 0. Process selections are based on test work coupled with our vast experience in the field of thickening. Our clarifiers provide nearly 95% water recovery from your process slurry and the highest underflow density in the. Activated sludge process control troubleshooting chart ohio epa, dsw, cau april 2014 capacity. Aerobic digester with thickenerclarifier recycled sludge thickenerclarifier supernatant aerobic digestersludge. Applications typically include filtrate washwater recovery in large industrial treatment plants and various high solids mining process applications. Increase capacity or decrease loading possible toxicity to aeration system. Our experienced staff will provide high efficiency, low maintenance systems that will provide the highest return on investment.
Use of thickenersclarifiers usually placed downstream of digester should be designed for feed sludge plus recycled sludge flow should have capacity to clarify the supernatant liquor and to thicken the settled sludge. Improve clarifier and thickener design and operation. Fundamentally, thickeners and clarifiers are both used to settle solids which results in the separation of liquids and solids. High capacity, high rate, and conventional thickeners clarifiers provided for liquid solid separation for mining, chemical processing and industrial applications. Thickening or dewatering may be defined as the removal of a portion of the liquid from a pulp or slime made up of a mixture of finely divided solids and liquids. Sludge thickeners thickening of sludge using sedimentation is a common method of increasing the solids concentration due its simplicity of operation, low maintenance and good performance. They are often acetal sorbitolbased agents which form a continuous, fibrous gel network that promotes fine nucleation throughout the resin upon cooling figure 10. The use of these additives cut across several process industries including food, pharmaceuticals, cosmetics and personal care, adhesives, textile. Continuous thickeners have undergone several modifications that have resulted from the development of a wide variety of organic polymeric flocculants. For comprehensive product specifications, drawings and additional options for any system, contact your local amwell representative or call our corporate office at 6308986900. The tank requires only 2 flat bed trucks and width permits for hauling.
The driving force for the separation is gravitational, where the differences in. Both types attempt to portray the real operation and therefore should have the same height as standard tanks. Sludge thickeners the hei sludge thickener is an efficient method to gravity concentrate and decant waste sludge. A clarifier is generally used to remove solid particulates or suspended solids from liquid for clarification andor thickening.
The difference between a clarifier and a thickener is subtle as they will visually look the same. Monroe environmental builds primary and secondary circular clarifiers for industrial and municipal wastewater treatment, as well as flocculating clarifiers and solids contact clarifiers for clean water or potable water applications. Eimco water technologies component clarifier and thickener mech anisms have been developed as a means of meeting a broad range of water and wastewater. For the rest of the time, however, thickener performance or lack of it seriously affects the rest of the. Us8187470b2 enhancing sedimentation performance of. A thickener will give you a high density underflow while a clarifier will not. Clarifiers may also be used for temporary sludge storage during diurnal flow. Some mineral processing plants encounter difficulties in dewatering pulps using clarifierthickener ct equipment due to a layer of fine particles, air bubbles and chemicals formed at the top of the liquid in the thickener. Bridge supported clarifiers and thickeners are offered in sizes ranging from 5 to 80 in diameter. For example in secondary clarifiers of activated sludge systems both clarification and thickening operations are carried out.
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