Like the High Rate thickener, the Paste thickener uses high floccu lant dosage and optimised feed . ... flocculant dosage and flu x rate on thickener underflow and . overflow results. (Pearce 1980).
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The PHOENIX AltaFlo™ Thickener is a rake-less thickener that provides ultra high-rate mixing, flocculation, and internal dilution followed by clarification and positive sludge collection and …
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The most effective dose may also change depending on the flocculant type, which is often dictated by the available charges or size of the flocculant. Additionally, the water's pH can affect the performance of a flocculant. The pH scale is used to determine how acidic or basic the water is. Most flocculants work best at neutral conditions (pH ...
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High Rate Thickener. WATER IS BECOMING AN IMPORTANT COMMODITY! ... Tanks are 16 feet high and range in diameter from 30 to 85 feet. The systems can handle 2,000 to 18,000 gallons per minute and can be designed to fit the plant's exact needs.
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The introduction of polymeric flocculants gave an impetus to development of High Rate Thickeners. The result is now common use of the term "High Rate Thickener" which has been applied in all areas of industry. The characteristic features of a High Rate Thickener, which distinguishes it from a Conventional Thickener, are: Deeper feedwell
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Description. The High-Rate thickeners became popular in the mid 1980's and are relatively newcomers to the sedimentation line of equipment. As already discussed previously Thickeners are a major component in a plant layout and occupy large spaces which may be saved by introducing high-rate machines. Furthermore, they are normally positioned far away from the …
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The introduction of polymeric flocculants gave an impetus to development of High Rate Thickeners. The result is now common use of the term "High Rate Thickener" which has been applied in all areas of industry. The characteristic features of a High Rate Thickener, which distinguishes it from a Conventional Thickener, are: Deeper feedwell
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The PHOENIX AltaFlo™ Thickener is a rake-less thickener that provides ultra high-rate mixing, flocculation and internal dilution followed by clarification and positive sludge collection and …
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Adding flocculants to the slurry can significantly improve performance. These chemicals bind fine particles together, forming larger, faster-settling flocs. ... Ultra-high-rate thickeners are ...
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Feed slurries are typically flocculated in a thickener's feedwell to increase the settling rate, underflow density and overflow clarity. High molecular weight polymeric flocculants are normally used, but present a number of challenges in terms of make up, dilution, delivery and mixing with the feed slurry.Various aspects of the flocculant dilution and delivery system have been …
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Conventional or high-rate type; Rakeless ultra-high-rate type; High-density type; Deep-cone type; To illustrate the differences between these thickener types. Figure 18.5 depicts underflow produced by the thickener compared with the relative yield stress of the material. High-rate thickeners produce the lowest density and yield stress (<20 Pa).
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The clarifier is a modified Ultra High-Rate Thickener, which has been modified to include a screen deck in the clear water zone of the thickener. Floating filter beads are located below the screen, where they act with the flocculant to filter the overflow from the thickener. The key to the successful long-term operation of the clarifier lies ...
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High Rate Thickeners High rate thickeners are designed specifically to maximise the flocculation efficiency of flocculants. They differ from conventional thickeners in feed well design, size and control. Unlike conventional thickeners, high rate thickeners must use flocculants. The basic design of a high rate thickener is below.
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Whether you choose a High-Rate Thickener, a Deep Cone Thickener or one of our other solutions, we'll utilise all our process and materials expertise to optimise the underflow to meet your needs and achieve solid-liquid separation at the …
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4 FLS — Thickeners and Clarifiers High-rate thickeners High-rate thickeners are designed to provide roughly 12 times the throughput of conventional machines of similar size. The key features for high-capacity thickeners are the feedwell design and the feed slurry dilution method. Our patented E-Volute™ feedwell offers Computational Fluid ...
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A high dilution of the flocculant was found to be unnecessary, due, apparently, to the rapid rate of blending with the slurry. Reagent concentrations of 0.1 to 0.25% were normal, and in some cases, using water emulsion reagents, …
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the thickener feed. Adjustable Dilution Ports Optimize flocculation and enhance settling rates. Heavy-duty Drive with Lift Ensures reliable, continued operation during high-torque conditions. Measurements Bed level and bed mass can be measured to help determine flocculant dose and underflow pumping rates for efficient and stable operation ...
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and expected performance of Outotec® High Rate Thickeners and clarifiers is dynamic bench or pilot scale testing, as static settling tests do not adequately simulate the high rate principle. Bench-scale testing Continuous bench-scale tests are performed in our 100 mm (4") diameter dynamic thickener or clarifier at site or in our laboratories.
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They use minimal amounts of flocculant to quickly settle the particles suspended in the slurry, making High-Rate Thickeners environmentally friendly. High-Rate Thickeners can be supplied with flat-bottom, on-ground tanks or elevated …
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The flocculant rate was varied from 15 to 60 g/tonne. The comparative result is shown in Fig. 9. It was observed that with increase in flocculant dosage, the rate of settling increases. Also at 10% solid concentration, the flocculant may require at lower dosage whereas at higher solid concentration, the higher dosage of flocculant is required.
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High compression thickeners Achieve a higher density underflow with our High Compression Thickener. The HCT has been designed to suit customer needs with a deeper solids bed and higher rake torque than our High Rate Thickener or conventional thickeners. Consistent and high-density underflow Maintains a constant solids inventory and solid/liquid
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SepFloc Series flocculants are "Ultra-High Molecular Weight" water soluble polymers that work by two different methods of flocculation. ... Lower usage than traditional flocculants for thickeners; ... (Lower percent actives/cost version for facilities without the ability actively manage usage rates) Improved Flocculant Performance; Improved ...
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In order to maximise the benefits obtained from flocculating agents when used as settling aids in high rate and conventional thickeners, it is often necessary to dilute the thickener feed prior to flocculant addition. In some cases, no flocculation at …
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Among other advantages is the smaller volume of the tank so it speeds up startups or shutdowns and less volume is required for storing the product in the event that the tank has to be emptied. Likewise, high-rate thickeners consume …
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The underflow of high-rate thickeners is "slurry," which has relatively no or only minor yield stress. Conversely, WesTech ... AltaFlo™ Ultra High Rate Deep Bed™ Paste Y I E L D S T R E S S C U R V E Which Thickener is Right for ... • Latest eedwf ell designs or f optimum flocculant
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The AltaFlo™ ultra high-rate thickener is a rake-less thickener that provides mixing, flocculation and internal dilution followed by clarification and positive sludge collection and removal in a single tank.
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Beneficiation of coal is a water intensive process, and the water is recovered in downstream operations in the high rate thickener (HRT) and vacuum belt filtration (VBF). Clean coal particles entering the HRT have an inherent tendency to enter the overflow because they are extremely fine and hydrophobic. Hence, flocculants (polymers) are used to floc the ultrafine …
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Bolted thickeners resulting in less time spent on site. HIGH RATE TECHNOLOGY. Our specialised feedwell design allows for improved sediment discharge directed at the thickener apex, thus decreasing short circuiting and competing of solids particles with each other, leading to a faster settling rate of the material.
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and compaction zone of the thickener. The AltaFlo operates with typically the same flocculant consumption as compared to a high-rate thickener processing the same material. Contact WesTech to find out more about why the AltaFlo may be a perfect fit for your plant. The AltaFlo™ ultra high-rate thickener is a rake-less thickener that provides
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Flocculant usage is one of the highest running costs for a thickener. Reactorwell™ features are proven to lower thickener running costs. The improved Autodil™ ... High rate thickener HRT-S HRT-S is a pre-engineered high-rate thickening solution widely used for Application dewatering of slurries. Partner for positive change
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Additionally, by combining the settling rate performance of the three flocculants, it can be concluded that APAM was the best flocculant for selecting ultra-fine particles; At a certain amount of flocculants additive, the flocculant network structure reached the best development state, which made yield stress 118% higher than slurry without ...
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High-Rate Thickeners Ultra Rakeless Thickeners ... but sometimes a coagulant and/or cationic polymer is necessary in conjunction with the flocculant to achieve optimum settling. Static settling. After the chemicals are selected, a simple cylinder test is performed to evaluate the settling rate, compaction of the underflow mud and clarity of the ...
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One recent innovation is the AltaFlo Ultra High Rate Thickener, featuring: No moving parts. Minimal space requirements. High underflow solids (as high as 50-60% in mining applications).
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