Measuring Settling Rates and Calculating Thickener Capacity

A curve plotted from the results of a settling test such as is illustrated in Fig. 1 will show a constant settling rate throughout the stages represented in Fig. 1 (E, F and G), an increased rate when the stage shown in Fig. 1 (H) is reached, followed by a rapid retardation in the settling rate after zone B disappears, until zone C has also

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Improve Clarifier and Thickener Design and Operation

Applications to thickener design. Once the settling flux curve is drawn, the optimum operating point can be determined. To calculate the removal rate, construct an operating line from the feed point, tangent to the settling curve, and crossing the x axis. The x-intercept is the maxim um underflow solids concentration possible, as shown in Figure 7.

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Settling Rate an overview ScienceDirect Topics

Settling Velocity of 50 μm Particles of Different Density in Water for Different Concentration Criteria. In these circumstances, dilution of the feed stream will increase the settling rate and reduce the thickener area required for a given duty (Fig. 16.2). 16.2. Solids concentration vs settling flux and flocculant dosage.

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Thickener EKCP

EIMCO-K.C.P. High Rate Thickeners are designed to maximize the flocculation efficiency, self-dilution and settling rates. EIMCO-K.C.P. High rate thickeners are designed to provide high underflow concentration with smaller diameter. The high velocity feed is split to two compartments with opposite tangential inlets that are positioned in two

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Beginners Guide to Thickeners Outotec

The measurable parameters that can be used for thickener control include thickener feed flow rate, feed density, underflow density, overflow clarity, bed level, bed mass, rake torque, rake height, solids settling rate and underflow rehology.

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(PDF) THICKENER DESIGN, CONTROL AND DEVELOPMENT

between particles become signifi cant and the solids settling rate red uces as these the actual thickener design is a compromise between these criteria. Like the High Rate thickener,

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Thickener an overview ScienceDirect Topics

The corresponding volume may be 4–15 times smaller than with conventional thickeners in the same application. As a consequence, change in the solids feed rate or the settling characteristics of the solids will change the sludge level much more rapidly, therefore, high-rate thickeners require some form of automatic control.

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High Rate Thickener Outotec

The Outotec FrothBuster™ deaerator reduces the amount of froth forming on the surface of thickeners and our innovative Outotec Vane Feedwell™ incorporates interconnected upper and lower zones to further improve performance. Uses flocculation chemistry to dramatically increase settling rates (0.35-1.5

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Biosolids Technology Fact Sheet Gravity Thickening

In contrast to primary solids, secondary solids have a large surface area per unit mass, which results in low settling rates and resistance to compaction. Thus, the use of gravity thickening alone usually cannot achieve the required thickening. or centrifuge thickener. DESIGN CRITERIA Preliminary Bench-Scale Study If representative samples

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CHAPTER 3 SLUDGE THICKENING Marmara Üniversitesi

activity. A well operated thickener will have a solids recovery of about 95% [3]. Design of Thickeners The thickening process takes place in a settling tank with long-enough solids retention time. For example in secondary clarifiers of activated sludge systems both clarification and thickening

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High Rate Thickener Outotec

The Outotec FrothBuster™ deaerator reduces the amount of froth forming on the surface of thickeners and our innovative Outotec Vane Feedwell™ incorporates interconnected upper and lower zones to further improve performance. Uses flocculation chemistry to dramatically increase settling rates (0.35-1.5

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Thickener an overview ScienceDirect Topics

The corresponding volume may be 4–15 times smaller than with conventional thickeners in the same application. As a consequence, change in the solids feed rate or the settling characteristics of the solids will change the sludge level much more rapidly, therefore, high-rate thickeners require some form of automatic control.

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Pulp, paste and putty: thickeners and flocculants for high

Thickener sizing can be obtained from the testwork results based on performance criteria established including free settling rate, flux rate, bed depth and underflow per cent solids data. The settling velocity of the solids within the free settling zone must be greater than up flow of water released (expressed as the ‘rise rate’ in m3/hr

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Thickeners Wampl

Thickener Types Conventional thickeners can be operated with or without flocculation depending on the application and are traditionally easier to operate due to their relatively slow settling rates. Wampl Hirate thickeners are designed to disperse flocculant efficiently into the settling zone of the thickener.

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Design Considerations for a Tailings Disposal System EMJ

The days of assembling a conventional (or high rate) thickener next to the plant and pumping a slurry to a settling pond will soon be history. Most mines today are considering an array of thickeners that also include high density thickeners and deep cone paste thickeners.

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GRAVITY THICKENING OF ACTIVATED SLUDGE

Continous gravity settling simulates a thickening chamber and is thus much more representative of the real operation. In studying the process of thickening, two types of continuous thickeners may be used: Laboratory columns varying from 0.5 2 ft. in diameter, and pilot plant thickeners

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Dynamic simulation of the effect of time-dependent

gel point and hindered settling. These equations can be only used for prediction of thickener behavior in the steady state condition. They concluded that the required bed height to achieve the certain amount of solid percent at the thickener underflow is a function of effective solid stress, flux density function and cross section area of the

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Inclined Plate Clarifier Design and Sizing Procedure

The Impact of Settling Rate on Inclined Plate Clarifier Design. Determining the hydraulic loading ratio required to meet your effluent requirements (ppm, mg/l) is an important step in the design and sizing of any clarification system. A small change in the hydraulic loading ratio can result in a large change in the size of the specified clarifier.

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Thickener sizing and the importance of testwork

Thickener sizing methods . Depending on the stage of the project, and whether or not samples of indicative feed material are available, a number of different methods can be used to determine thickener sizing. In general, these can be classified as: rule of thumb sizing, cylinder settling tests, and, lastly, dynamic thickener testwork.

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Sizing Criteria for Inclined Plate Settlers

Apr 16, 2014Sizing Criteria for Inclined Plate Settlers Theory, Current TCEQ Rules, and Full-Scale Operating Data From settling theory, capacity is Surface Loading Rate (SLR) Raw Water Settled Water. UPRATING IS AN OPTION: MISSOURI CITY CASE STUDY .

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Thickening Resource Book

settling rate 2 to 10 times over that obtained in a conventional thickener, thus reducing the unit area requirements by a similar factor. The corresponding volume may be 4 to 15 times smaller than with conventional thickeners in the same application. As a consequence, change in the solids feed rate or the settling characteristics of the solids

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6 SETTLING TESTS Experimental Methods

6.1. Hence, in an SST, different settling regimes occur simultaneously at different locations throughout the tank. Low concentrations in the upper regions of the SST favour discrete (flocculent) settling whereas the concentrations of the incoming sludge are typically in the range for hindered settling, and sludge thickening inside

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Paste Thickeners McLanahan

Paste Thickeners can help producers eliminate the need for settling ponds and other structures. They are meant to achieve the highest solids concentrations possible through gravity separation. The resulting mud, described as a paste, is often so thick that it becomes non-segregating — no further separation of water and solids can be achieved. As a guide, a paste material is measured with a

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A description of the sedimentation process during dynamic

A description of the sedimentation process during dynamic thickener operation A.J. Vietti and F. Dunn 2 Paste 2014, Vancouver, Canada consolidation theory was applied to the settling of compressible slurries (Shirato et al., 1970) which led

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Design Considerations for a Tailings Disposal System EMJ

The days of assembling a conventional (or high rate) thickener next to the plant and pumping a slurry to a settling pond will soon be history. Most mines today are considering an array of thickeners that also include high density thickeners and deep cone paste thickeners.

get price

Thickeners Wampl

Thickener Types Conventional thickeners can be operated with or without flocculation depending on the application and are traditionally easier to operate due to their relatively slow settling rates. Wampl Hirate thickeners are designed to disperse flocculant efficiently into the settling zone of the thickener.

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Using State Point Analysis to Maximize Secondary Clarifier

Where: VS is the settling velocity and x is the TSS concentration of the sludge. VO (the initial settling velocity) and k (the settling rate) are defined by the settling characteristics of the sludge. In the example above, the values of VO and k are 6.98 in/min and –0.0006 L/g, respectively.

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Dynamic simulation of the effect of time-dependent

gel point and hindered settling. These equations can be only used for prediction of thickener behavior in the steady state condition. They concluded that the required bed height to achieve the certain amount of solid percent at the thickener underflow is a function of effective solid stress, flux density function and cross section area of the

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Thickeners and clarifiers Complete range of reliable and

High-rate thickeners In developing our high-rate thickeners, we draw upon decades of experience in flocculation, feed dilution, and sedimentation technology from EIMCO® and Dorr-Oliver®. We work with you to address your specific process challenges that affect your thickener and clarifier selection. Traction thickeners on a tailings duty High

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High Rate Thickeners HiFlo™ PHOENIX Process Equipment

PHOENIX HiFlo™ High Rate Thickeners clarify wash plant effluent water while thickening the slurry to 40-45% solids, greatly reducing the underflow slurry rate to the slurry pond. PHOENIX Thickeners use sedimentation technology to maximize the water recovery rate, providing clarified overflow water that can be recycled and reused in the process.

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Pulp, paste and putty: thickeners and flocculants for high

Large diameter to height ratios are a feature of conventional thickeners, which can have diameters beyond 100 m. High rate thickeners can handle more solids tonnage per unit area due to a faster settling rate than conventionally designed thickeners and in all but the most extreme cases are limited to around 50 m diameter.

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Sedimentation Process and Design of Settling Systems

Design methodology of high rate settling systems has been presented with worked out examples and the flexibility of control of operation has been shown. Lastly, along with the presentation of all the theories of 'Thickener Design' the same problem of thickening has been solved with all the methods to reveal the variation in the designed thickeners.

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Introduction to Sludge Handling, Treatment and Disposal

Plain settling tanks can produce solids contents in sludges of up to 8.0 percent for primary sludges and up to 2.2 percent for activated sludge. Activated sludge can also be concentrated by resettling in primary settling tanks. 3.1 GRAVITY THICKENERS. A gravity thickener will be designed on the basis of hydraulic surface loading and solids loading.

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A description of the sedimentation process during dynamic

A description of the sedimentation process during dynamic thickener operation A.J. Vietti and F. Dunn 2 Paste 2014, Vancouver, Canada consolidation theory was applied to the settling of compressible slurries (Shirato et al., 1970) which led

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MIP Process Corporation USA ProductsServicves

High Rate Thickening is a process whereby mineral particles are flocculated, thoroughly mixed within a feedwell and then injected uniformly into a hindered settling zone in the thickener with largely radial motion. A pre formed hindered settling zone allows horizontal distribution of incoming feed into the settling bed which, at the point of

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Clarifier Sizing Spreadsheet HydroFlo Tech

What is the Process Flow Rate: 100.00 : What is the Desired Hydralic Loading Ratio: 0.39 : NOTE: The hydraulic loading ratio is typically set from .25 to .5 The lower the settling rate or specific gravity (of the settleable material) the lower the hydraulic loading ratio. Hydraulic loading ratios can be determined by field tests or calculated based on the specific gravity of the chemically

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Tailings Mineral Industry Solution

Paste thickeners thicken tailings to higher underflow solids concentrations than conventional and high-rate thickeners. For example, a tailings stream in an iron ore application could be thickened to 45–50% solids Newtonian slurry in conventional or high-rate thickeners.

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Instrumentation and Control of Sedimentation Equipment

height, bed level, bed pressure, feed rate and density, underflow rate and density, settling rate, and overflow turbidity. Many of these are easily measured, while some can be difficult. Combining these signals into a coherent control strategy requires forethought and an understanding of the fundamentals of thickener operation.

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