The key features for highcapacity thickeners are the feedwell design and. The common thickener underpins the performance of most hydrometallurgical facilities. The early methods of thickening employed plain, flatbottomed tanks into which the pulp was fed until the tank was full. A thickener will give you a high density underflow while a clarifier will not. The many innovative features of these units, including.
Monroe environmental circular thickeners are a crucial step between upstream process clarifiers separators and downstream dewatering and sludge conditioning processes. Thickeners and clarifiers can be designed to operate in either batch or continuous mode, although most commercial operations utilise the latter. The vessel defines a free settling zone, a hindered settling zone intermediate, an upper clarification zone and a lower compaction zone. Clarifiers and thickeners cst wastewater solutions. Clarifiers and thickeners hennesy mechanical sales l. Applications typically include filtrate washwater recovery in large industrial treatment plants and various high solids mining process applications. 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. The highrate thickeners became popular in the mid 1980s and are relatively another difference that may be seen externally is the absence of lifting devices since there are also concepts that resemble sludgeblanket clarifiers with to improve the mixing efficiency between the small volume of flocculant solution and. Lastly, particletoparticle interactions between thickener and charged surfaces of system components bring about changes in rheological properties. Clarifiers and thickeners are essentially ide ntical units. Monroe environmentals circular thickeners are designed to receive waste sludge from various unit processes and prepare them for dewatering and other sludge conditioning processes. 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. 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.
Thickeners as well as clarifiers are both used to separate liquids and solids by settling process with only one difference i. The tank requires only 2 flat bed trucks and width permits for hauling. The bridge support clarifiers are used as primary wastewater treatment. Process selections are based on test work coupled with our vast experience in the field of thickening. 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. High rate thickeners clarifiers enviroclear company, inc. Circular thickener clarifiers monroe environmental. The difference between a clarifier and a thickener is subtle as they will visually look the same. Thickener feedwells should be sized for a liquid velocity of 4 ft. Some applications where we have been involved in include. Drive units are built with precision bearings, agma rated gearing, and decades of experience. Our clarifiers recover nearly 95% of the water from process slurry while maintaining the highest underflow density in the industry. The dewatering performance of the ct then deteriorates under these conditions, and a.
Thickeners circular thickeners are a crucial step between upstream process clarifiers separators and downstream dewatering and sludge conditioning processes. Having a higher sidewall tank to provide enhanced compression effects a steeper floor slope to assist in moving solids to the discharge area a low profile rake structure combined with pickets to enhance the bed. 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. Fundamentally, thickeners and clarifiers are both used to settle solids which results in the separation of liquids and solids. Thickeners and clarifiers complete range of reliable and. The ease by which thickeners are effectively dispersed or dissolved in the solvent.
In this discussion, thickener will be used to describe both units. Mip thickeners and clarifiers can be supplied for a variety of applications from mineral processing to water treatment. For the rest of the time, however, thickener performance or lack of it seriously affects the rest of the. A well designed thickener provides storage and equalization, and reduces the costs associated with dewatering. For example in secondary clarifiers of activated sludge systems both clarification and thickening operations are carried out. Sludge contains biosolids that have been removed from liquid sewage. Ashtontucker provides drive units for clarifiers, and thickeners for water, wastewater, and mining applications. Thickeners are similar to other circular clarifiers in appearance and. Thickeners are essentially clarifiers producing a clearer over flow. Positive, rapid sludge removal resulting in fresher sludge, less chance of septicity, reduced aeration. Improve clarifier and thickener design and operation. Del mobile clarifier and thickener tanks del corporation. In addition to this existing technology, mip process technologies pty limited brings customized and tailormade process solutions. Us8187470b2 enhancing sedimentation performance of.
Enviroclear manufacturer of clarifiers, thickeners, horizontal belt vacuum filters, pronto pressure filters, linear screens, and replacement drives. 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. Such an apparatus comprises a vessel receiving a slurry of liquid and solid particles suspended in the liquid. A liquid feed with suspended solids is fed into a tank with a diameter of 5 to 500 feet. Highdensity thickeners can be considered an intermediate case between highrate thickeners and paste thickeners. Our clarifiers provide nearly 95% water recovery from your process slurry and the highest underflow density in the. Thickeners are characterized by having higher side walls, steeper. Component clarifier feedwells are usually sized at 25% of the basin diameter. Mip process technologies thickening and clarification. Such jumbo thickeners, when centrally driven, require for most demanding applications extra heavy duty drive heads some of which reach a continuous operating torque of 3.
The throughput capacity of a clarifier is based on its ability to perform the twofold functions of clarifying the juice, and thickening and removing the settled mud at a rate to match the factory. The solids were then allowed to settle as long as required, the top liquid was decanted, the settled solids. Sludge thickening is the process used in wastewater treatment centers to increase the solids concentration and decrease free water. The design considerations are based on the settling rates of the slowest settling particles and conditions for minimum disturbance of the medium water through which the solid particles are allowed to settle. The enhanced deliquifying of the compacted bed of deep bed thickenerclarifier is disclosed. Lamella clarifier wikipedia, the free encyclopedia. Thickeners and clarifiers are both used to separate solids and liquid, but.
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. Us6758978b1 deep bed thickenerclarifiers with enhanced. Tank construction standard designs are available for concrete or steel tankage. Sludge thickening an overview sciencedirect topics. Phoenix, az 85034 602 9963444 direct 602 9969408 fax. Traction thickeners on a tailings duty highrate thickeners highrate thickeners are designed to provide roughly 12 times the throughput of conventional machines of similar size.
High capacity, high rate, and conventional thickeners clarifiers provided for liquid solid separation for mining, chemical processing and industrial applications. Launders inboard and outboard arrangements are available and either may be utilized. Continuous thickeners have undergone several modifications that have resulted from the development of a wide variety of organic polymeric flocculants. Conventional thickeners these thickeners differ in the way they are built.
Bridgesupported mechanisms for tank diameters to 50 feet. 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. Dissolved air flotation daf clarifiers and thickeners overview. Thickeners are used to concentrate solids, while clarifiers are used to purify liquids. 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. As the particles settle, angled rake arms move the concentrated slurry toward the center of the tank, where it is removed. Ultra high capacity uhc clarifiers provide very high flow, high tonnage capacities, low maintenance, a small footprint, and are preassembled to minimize installation time. 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. Circular clarifiers general information thickeners and clarifiers use slowly rotating rake arms to separate solid particulate. The high time for thickeners was in the 60s when the metallurgical industries were booming and sizes of up to 150 m diameter were constructed.
As a result, there are now two basic types of continuous thickeners. 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. The tank is built in 2 sections, an upper and lower section, for ease of transport. The driving force for the separation is gravitational, where the differences in.
What is the sludge thickening process in water treatment. Our clarifiers provide nearly 95% water recovery from your process slurry and the highest underflow density in the industry. Thickeners circular thickeners are a crucial step between upstream process clarifiersseparators and downstream dewatering and sludge conditioning processes. Our thickener and clarifier product range has been tailored to the specific duty requirements of. Design of thickeners the thickening process takes place in a settling tank with longenough solids retention time. The equipment incorporates many superior designs, both mechanical and operational. Contact us to request a quote that meets your needs. A clarifier is generally used to remove solid particulates or suspended solids from liquid for clarification and or thickening. Such layers are very stable and form a cap on the ct. Thickeners are simple, reliable, effective and efficientunder the right conditions. Dissolved airnitrogen flotation is used in applications where the specific gravity of the solids. 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.
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