Gravity Thickener Design Example
FIG. 7.46.2 Gravity thickener design data plots. Data plot procedure: 1. Conduct settling tests at various initial solids concentrations (a through d in panel A), covering the range of expected thickener influent solids concentrations; 2. Determine the settling velocity Vs for each concentration as the slope of a line tangent to the initial ...
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Biosolids Technology Fact Sheet
Specific Design Criteria Nearly static conditions are required in gravity thickening tanks in order to induce settlement. Therefore, the tank design must ensure a smooth, continuous flow of liquid at the center well, the s, and the solids removal point. Gravity thickener designs usually include circular tanks, 3-4
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AS-H Belt press for efficient sludge dewatering | Alfa Laval
Achieve 2% or more additional dry solids from your belt filter press or gravity belt thickener. When placed ahead of an existing belt filter press or gravity belt thickener, the Orege SLG TM sludge pre-treatment system changes the rheology of your sludge so that it releases water more freely. Its small footprint means it can likely fit in your existing facility.
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Theory and application of thickener design
A thickener operating with such an underflow velocity should have an underflow concentration Cu as shown. By material balance, the underflow solids flux should be Gu as given by Eq. (3). The underflow operating line will be tangential to the flux curve if the feed flux GF is greater than Gu; as is the case of Fig 1.
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Rotary Drum Thickener
–– Superior–design– –– Experience:–over–200– ThickTech™–installations– How the ThickTech™ Outperforms Other RDTs Superior Drum Design Staged Screens: –Dewatering occurs in four distinct dewatering stages divided by split augers –Woven wire mesh size can be changed between stages to maximize–dewatering Roll Bars:
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Critical review of thickener design methods
A comprehensive computational fluid dynamics (CFD) model has been developed to predict likely full-scale performance under various process conditions, based upon a knowledge of thickener design, plant flows …
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Measuring Settling Rates and Calculating Thickener Capacity
The following is an illustration of the method used in computing the area and depth required in a thickener to handle 100 tons of pulp per day, thickening from 6 parts fluid to 1 part solids down to 1.12 parts fluid to 1 part solids. Fig.7- Slime-Settling Data, Nipissing Low-Grade Mill, Cobalt, Ont.
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Thickener
The thickener was applied at various concentrations (0, 4, 8, or 12 g/l) in the pretreatment bath to determine the effect of cationization on the optimal level of thickener. The concentrations of soda ash and urea in the pre-treatment were 40 and 100 g/l respectively.The fabrics, untreated cotton and cotton cationized with 100 g/l reactant, …
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Feed Dilution-Based Design of a Thickener for Refuse
The main facts to be considered in the design of a paste system are the size (diameter) of the thickener, the tailings dam, the underflow pumping, and the control system (Klein et al., 2009 ...
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Thickeners and clarifiers Complete range of reliable and …
design maximises pulp concentration, and produces uniform, non-segregating underflow slurry with a paste consistency. E-® ultra-high-rate clarifier and thickener With its rakeless design, the E- uses novel technology to accomplish both clarification and thickening in a single unit that takes up minimal area. High-density thickeners
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Sizing and Operating Thickeners
This paper presents a development of thickening theory which provides a reliable and easy-to-use method for determining the size of continuous thickeners from batch settling tests. It also offers a …
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Gravity clarification and thickening
As always, pilot or large-scale tests, if properly conducted and evaluated, yield the best test data for thickener design. 5.2.2 Applications, construction and types of gravity thickeners Most of the applications of gravity thickeners are in mineral and coal processing, and in waste water treatment.
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Solids Thickening
2.2.8 Rectangular Thickener Considerations 23-16 2.3 Operational Considerations Related to Design 23-16 2.3.1 Feed Solids Source and Characteristics 23-16 2.3.2 Polymer 23-17 2.3.3 Underflow Withdrawal 23-17 2.4 Ancillary Equipment/Controls 23-17 2.5 Design Example 23-17 3.0 DISSOLVED AIR FLOTATION THICKENER 23-18
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Thickener Operation and Flocculant Application
Table of Contents At start-up, the relatively high level of feed solids, 17-20%, called for in design led to difficulties in achieving the degree of flocculation necessary to meet required settling rates. It was recognized that decreasing feed solids would improve thickener performance while reducing flocculant consumption (Figure 2). This was …
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Sizing and Operating Thickeners
Thickener Operation Figure 13 shows a log-log relationship between underflow concentration and unit area at various interface heights for a desulfurization sludge. This graph was made from the data gathered in the continuous tests, considering the interface height recorded for each run instead of the inventory of solids in the …
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Chapter 20 Design of Thickeners
Design of Thickeners. Abstract This chapter presents different theories of thickener design. These the-ories have been applied to the solution of the same problem, wherever …
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CHAPTER 12 Sludge Processing and Disposal
The thickener underflow is generally used as a source of water for the air-charging units, although primary tank effluent or plant effluent may also be used. 12.3.3.2 Design Sizing The engineer shall provide the design basis for sizing the units and for the support calculation. Design sizing should be based on rational
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Thickener modelling from laboratory experiments to full …
1 Introduction. Thickeners are critically important to the minerals industry. In plan view, they are simple looking devices that should be easy enough to model and design based on …
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Solid – Liquid Separation – Thickening
Thickener Design-Continuous Thickeners. For designing continuous thickeners, the three most important parameters that need to be established are ... the area of the thickener. 14.3. Using the data of problem 14.2, determine. 1. the volume of sludge in the underflow and hence the compression zone height, 2. the height of clarification zone. …
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Settling and Thickening Test Procedure
A log-log plot of this data usually will give a straight line of slope m. The static detention time calculated for the desired overflow clarity, and the observed bulk settling rate may be used, with proper scale-up factors that determine sedimentation area and depth requirements.For thickener sizing, the relevant relationship is:
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CHAPTER 3 SLUDGE THICKENING
The design involves selecting a typical solids flux and calculating the required surface area by dividing the anticipated solids feed by the flux [3]. Area of the thickener: 2. Design based on Iaboratory data First Approach: It is the best technique if the Iaboratory data is available. Typical test is done by using a 1000mL-graduated cylinder.
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Theory and application of thickener design
In this way, it is possible to obtain the exact relationship between the settling flux density of solids in the hindered settling or non-compression zone, and consequently the design parameters for a continuous thickener can be obtained for an underflow solids concentration range and sediment height range wider than those obtained from a batch ...
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301Sample
The data in the table below have been collected for the settling of flocculated suspensions using dilutions of 2:1, 3:1, and 4:1. a) Plot the data and determine the settling rate of the suspension at each dilution. In each case, the settling rate should be determined graphically from the straight-line portion of the plot before compression begins. b) The final dilution …
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Improve Clarifier and Thickener Design and Operation
The typical design procedure will be shown using data from a large industrial wastewater treatment facility, involving acid and base neutralization and heavy metals removal. ... In Table I of the July article, "improve Clarifier and Thickener Design and Operation," by Joel Christian (pp. 50-56), the titles Vi and TSS are reversed. The first TSS ...
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CHOOSING THE RIGHT THICKENER
ey are becoming less common.Elevated steel tank Thickener design commonly uses a "sag-floor" methodology whereby each sector of the tank floor is su. orted between radial beams. By introducing sag into the sectors a better load distribution is achieved, allowing a thinner steel plate, lower. umns is a complex matrix.
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Further development of software for the design and …
Coe and Clevenger's design procedure was the only quantitative knowledge in sedimentation accomplished during the first half of the 20th century [20]. Based on Kynch's theory of sedimentation several authors [10], [11], [13], [21], [22] devised methods of thickener design. They affirmed that one settling plot had all the information needed to ...
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Lesson 11: Sludge Thickening Objective
Let's watch a short video showing how a gravity belt thickener operates. The incoming secondary sludge ranges from 0.3 - 0.6% total solids while the thickened sludge leaving the belt ranges from 4 - 6% total solids. This indicates that the sludge leaves the gravity belt thickener about 10 times thicker than when it entered.
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Thickener design procedure and method
It is reasonably easy to determine a thickener area requirement from settling data but that is simply the first step on a fairly long journey. You must apply judgement to the calculations to allow for surges in feed rate and for process plant tonnage increases, ore mineralogy etc. Rakes and rake torque control is also very important.
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Sludge Thickening
Design a clarifier-thickener for the pulp and paper wastewater using the testing data described in Figures 7-84 through 7-95 to accommodate an influent design flow of 10 million gallons per day (MGD) and to achieve 60% suspended solids removal at 3.5°C with an underflow concentration of 10,000 mg/L. Influent suspended solids (the raw ...
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Static thickener
The thickener is a circular unit. The sludge suspension is introduced into the centre, inside the centre well. ... polymer flocculation can be of considerable interest in order significantly increase the flow rates tolerated by the thickener. Table 1 provides a few design data applicable to the different types of sludge.
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