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,
In order to develop rational methods of measurement and oratory testing, it becomes necessary to study the general phenomena of settling rates. Since it was desired to give the public the benefit of these methods at as early a date as possible, together with the knowledge of the general principles of slime settling necessary for a clear understanding of the oratory tests, we have
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. RAKE TORQUE
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 will change the sludge level much more rapidly, therefore, high
Settling: Without VS With Flocculant If, for some reason, the thickener's settling rate is too slow, as in the case of the grind being so fine or you are dealing with clay rich ore and now the concentrate stays in suspension. The thickener could be "s"
maxima, as at very low concentration settling rate is constant, and at high concentration the rate decreases rapidly. • Transport flux, Gt,Fluxof solids carried by liquid, is independent of the solids settling in the thickener, whether the solids settle or not, there
Dilute solutions very often give better results however over dilution will increase the up flow rate overriding the benefits of the enhanced settling rate. In most thickeners’ it is possible to check the efficiency of flocculation through sample observation by sampling the
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
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
Sizing 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 .
Settling: Without VS With Flocculant If, for some reason, the thickener's settling rate is too slow, as in the case of the grind being so fine or you are dealing with clay rich ore and now the concentrate stays in suspension. The thickener could be "s"
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
Thickener sizing methods . Depending on the stage of the project, and whether or not samples of indicative feed material are availe, 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 test.
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 with you to address your specific process challenges that affect your thickener and clarifier selection. Traction thickeners on a tailings duty High
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
Dilute solutions very often give better results however over dilution will increase the up flow rate overriding the benefits of the enhanced settling rate. In most thickeners’ it is possible to check the efficiency of flocculation through sample observation by sampling the
maxima, as at very low concentration settling rate is constant, and at high concentration the rate decreases rapidly. • Transport flux, Gt,Fluxof solids carried by liquid, is independent of the solids settling in the thickener, whether the solids settle or not, there
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
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.
Sizing 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 .
Thickener sizing can be obtained from the test 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
Oct 24, 2016· 1. Discrete settling, controlled by the overflow rate. 2. Flocculent settling, controlled by the overflow rate and depth of the clarifier. 3. Zone settling, controlled by the solids flux (see the page on State Point Analysis). 4. Compression settling, controlled by
Paste thickeners are uniquely different than conventional and high-rate thickeners. High-rate thickeners, that produce a settling slurry underflow, have been in use for decades. Thickener selection is based on feed characteristics and standard bench-scale tests combined with experience.
However, the initial settling velocity of the sludge bulk is given by ; V I = 6 exp ( 0.4 C O ) i.e. ; 1.21 m / h i.e. the clarification rate criteria that the overflow velocity be less than the initial sludge settling velocity has been transgressed ( the velocities are actually equal for U = 0.79 m / h ). Example 3-15 :
