ANDRITZ process engineering will determine the optimum percentage of feed solids for the specific application during laboratory or pilot plant test work. High Rate thickener with central drive unit. royco 11ms greases On the other hand, they do not create additional retention time in a compression zone. Thus lamina type units would seem best suited for particulate clarification. Learn more about managing your data and your rights. List your products and services to enhance your web presence and receive qualified enquiries. Where and to the extent that removals are governed by settling rates, such baffles increase the capacity of a space into which they are introduced. Recycled floccules are maintained in suspension by gentle agitation and augment the rate at which feed fines are collected. In some operations, thickener underflow is sent on to further processing, from which a certain amount of solids are returned to the thickener. Settled solids are sucked up from a thickening zone by a turbine impeller atop a draft tube and recirculated to a flocculation compartment or enclosure. Thus the initial cost of a unit, installed, filled, and ready to go, may be low. Whether a locally formed stream of clarified liquid remixes to some extent or is joined in the overflow by some streaming elements of unclarified flow, depends upon flow patterns. In applying long tube data, any areas filled with compressing solids would have to be subtracted from total overflow area to obtain that available for clarification. 31 shows a typical unit, long used in water treatment, that does have a flocculation compartment. High rate Thickener are used to concentrate as much as possible the solid in the bottom of the Thickener. Figure 34 shows an older design using the same principle. Diemme Filtrations High Rate thickeners are an advanced product derived from our extensive experience in solid/liquid separation applications, such as mining, chemical, waste water and more, coupled with our technical research to continuously improve and optimize sedimentation in filtration plants. Complete LAB & SITE testing (flocculants type and dosage selection, static and dynamic test, rheology test, sensitivity analysis). Figure 32 shows a competing design, similar inprinciple but different in configuration. (This has happened a number of times in industrial practice.) Portal and virtual trade fair for the industry, with Industry Plaza you will compare the products and get in touch with industrial suppliers, in order to get free quotes or information. In this way the thickener plant is able to guarantee automatically constant settling performance. The High rate thickener are equipped with a Sedicontrol system that monitors continuously the flocculation and adapt the polyelectrolyte dosing according to the right settling speed. Unit Operations Handbook: Volume 2by John J. McKetta Jr. High rate thickeners - Diemme Filtration AQSEPTENCE GROUP S.R.L. For clarification, the long tube test should predict removals, but note that the long tube is now very short because the vertical height of any flow compartment is small. Thickeners are utilized in various solid/liquid separation processes in order to increase the density of a process stream. thickener andritz bolted

Obviously such recycling increases the load on the thickener. The Cogede high rate thickener or thickener plants can be installed on tank made in carbon steel or on tank made in concrete. From Monday to Friday: 9am-6pm Other models under study predict that with increased settling area and constant retention (therefore small compression depth), compression capacity would be augmented. The High Rate Thickener or thickener plant are mainly used in the mining application for tailing management and for concentrate thickening and in all that application where it is important to reach an high concentration of solid in the thickener underflow.

copper flotation process zinc lead bulk xinhai For feeds in the clarification regime this commonly means mixing into it, one way or another, enough recirculated solids so that the mixed feed will be in the line settling (zone settling) regime. They do not increase its volume, so do not increase solids removal where it is governed by flocculation rate and hence by retention time. The total or equivalent overflow area of a lamina-type unit is the sum of the plan areas of each flow space or compartment formed by the baffle structure (plan area is the compartment area projected onto a horizontal plane). Under any upper boundary there will be an interface above which clarified liquid is produced as solids settle out below; but are not replenished from above. Lamina or tube-type settlers are smaller in size than unit-type settlers, and may be lower in first cost per unit of capacity. Just how much has, at this time, to be determined by piloting. Proper efficiency factors to use with this type of unit are not generally known, but might be expected to be low. For optimal use of our website, we use cookies. Complete your request and let our teams find you the best deals available. +33 (0) 1 77 92 99 79. The increase is usually insignificant, but if the subsequent processing selectively returns fines, an augmented recirculating load of fines will form. So the mechanism is probably just recirculation and mixing of sludge solids into the various feed streams to bring them into the line settling regime. Flow patterns in a lamina-type settler are complex because of density effects. Solutions you can count on in the chemicals industry, Unique flat, counter-current circuit design, Three levels of protection against overloading, Fully automated, including automatic load sensing for consistent underflow quality, Reversible or variable speed hydraulic units, Copper/cobalt, nickel, gold, uranium, coal, lead, zinc, iron ore, chrome, titanium sands.

They tie up less suspension in inventory, which may be of economic value if either solids or liquid are valuable. Usually flocculants are added to hold the resulting mixed feed solids structure together and to prevent segregation of fines from it. If the centrifuge overflow is then recycled to thickener feed, the recirculating load of fines which forms may in some cases become large enough to overload the thickener. Where, as in cane sugar juices, the line settling rate of the mixed feed exceeds the overflow rate necessary for simple clarification of unmixed feed, such a unit produces clean overflow at higher ratein some cases much higher. Solids settle out onto the baffles and are removed from suspension after settling only a short distance. Feed solids concentration is the single most important variable affecting the sedimentation properties of given slurry. Either the solids do not flocculate, or are preflocculated in a separate operation before being introduced into the settler, or flocculate so quickly that flocculation is virtually complete before much sedimentation takes place. If the boundary is not level, the film of clarified liquid is squeezed by hydrostatic forces along the boundary in a Their applicability for thickening follows a similar pattern. Since they can be considered for some purposes as a stack of unit thickeners (each of extremely shallow depth), they provide a high total overflow area, and thus should accept a high solids loading before a critical zone forms. The unit size will then increase with increased underflow recirculation. Obviously, the theoretical minimum area needed will occur just as this happens, but in practice recirculation control is not usually precise and does not appear necessary. On the basis of the currently used Coe and Oevenger model of compression, they would not therefore be expected to increase compression capacity. At some amount of recirculation thickening, area demand will become larger than that for clarification. New feed (plus flocculants and/or reactants) is introduced through orifices along hollow arms rotating below the top of a sludge blanket. It was originally conceived that the new- feed would be filtered through the sludge blanket, and in a loose sort of way it may be so explained, but if the new feed were not dispersed and locally mixed into the sludge blanket, it would channel to the top in low- density currents. Laboratory Testing Consulting & Engineering Process Equipment. A solid-bowl centrifuge, for example, acts in almost all cases as a classifier, in that coarse solids segregate to some degree from fines in the machine, and the fines report selectively to the overflow. Remixing settled solids into new feed increases the thickening load and hence the area demand for thickening. (This is settlement unaccompanied by flocculation. Areal efficiency should be particularly affected and reduced by nonuniform distribution of flow through the various spaces. The area has to be there anyway to satisfy overflow rate limitations. rising direction. analysis, seismic assessment). It was developed originally in Australia for clarifying cane sugar juice. The hydrodynamically rough handling of the underflow stream undoubtedly damages the existing floe structure. The optimum percentage of feed solids will ensure proper flocculation and achievement of maximum fluxes (t/m2/d). transcend cleantec sludge dewatering The feed well of the Cogede High rate Thickener can be also customised in order to guarantee an optimum flocculation by an auto dilution system or by force dilution system according the specific characteristic of the slurries. You need help ? Moreover our High rate thickener have a system that allow us to measure continuously the effort on the rake and by a system of hydraulic jacks to move up and down the thickeners Rake in order to have constant concentration thickener output and to avoid any mechanical problem on the mechanism.

However, we know the model is faulty. Powered by Gostec snc. They probably cannot produce and handle underflows at as high a solids content as conventional thickeners, and underflows must be much more closely controlled to prevent build-up and overflow of solids.

Structural design of engineered tanks aimed at weight reduction (static and dynamic F.E.M. A suitable fraction of the underflow stream is diverted into an external mixing chamber and/or flocculation compartment where it is mixed with new feed. In small sizes they are portable. Fig. Solids recirculation units comprise many types. The principles of particulate clarification are treated more fully under the section on classification.). This condition arises most often when thickener underflow is sent for further dewatering to a device which acts as a classifier. Solids from settling compartment A return to a flocculating chamber B where they are mixed with new feed. Solids recirculation units can be classified into those having a separate flocculation compartment and those that do not. The last technology of high rate thickener or thickener plant developed by Cogede allow to optimize the consumption of polyelectrolyte by special feed well design. In the design of Fig. The purpose is to increase the rate at which new feed solids are incorporated into the floe structure and/or to form a floe structure firm enough so that fines do not segregate from it in the feed layer. This type of unit is strongly counterindicated if scale formation is a problem or if solids tend to hang up and not slide down sloping surfaces. Industry Plaza: products, services and industrial equipment. This design, however, relies on a sloping bottom to discharge solids. High rate thickeners - Diemme Filtration. Circulation may be external, internal, or may consist of mixing new feed locally into the thickening zone, as in certain types of sludge blanket filtration units. These set up rapid circulations that probably cause some remixing and hence low efficiency factors. INTERNET USERS ALSO CONSULTED ON THE CATEGORY SLUDGE DIGESTION, Check out all the products from category sludge digestion. Thus clear liquid streams upward under any inclined boundary, while thickened suspension streams downward above one. Via G. Cespi, 2 61032 Rosciano di Fano, ITALY, Copyright 2020 COGEDE srl. Where the mixed feed reflocculates quickly enough to avoid segregation of fines in the feed zone, external recirculation should accomplish much of what internal circulation does, with less cumbersome mechanical configurations. 32 particularly points topologically and conceptually to external recirculation types. The one shown in Fig. The brain behind your operation: Metris addIQ control systems. WASTEWATER & SLURRY TREATMENT PLANTS, THICKENERS, FILTER PRESS. Industry's new products straight in your inbox! Since the solids are fully flocculated, there is no retention time demand, and since the floe structure is well-formed, it has a high settling rate. The internal sludge recirculation schemes embodied in the designs discussed above tend not to break down floccules existing in the settled sludges. There are two basic types of high rate thickener units: They contain space-cutting baffles that intercept settling paths at many levels. This is what is observed experimentally. Make your purchases easier for your business. Instrumentation & Control aimed at process optimization and Opex OPEX reduction. 33 the new feed is jetted into the thickening zone in such a way as to mix it thoroughly with the surrounding settled solids. So if the use of a solid-bowl centrifuge or any other classifying device is being considered for dewatering thickener underflow, or if there is selective recycle of solids to the thickener from any process source, a detailed material balance for all solids size fractions should be calculated to determine what the steady-state operating conditions will be. Mixed feed then flows to a settling unit of conventional configuration. The mixed feed then flows to the settling chamber. As long as thickening area demand is not controlling, this costs nothing. As noted earlier, such designs become impractical in large diameters. To the extent it happens, areal and retention efficiencies suffer. Whether you need spare parts, rentals, local service, repairs, upgrades, or modernization of your equipment.

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