feed well in a gravity thickener

The thickener or clarifier is the major piece of equipment used to recover water in mineral and industrial processes The one thing all thickeners have in common the feedwell is the core of every thickener’s performance A thickener relies on a feedwell for even distribution of solids and flocculation of suspended particles

The center feed well design can be equipped with a chemical addition system with mixing and flocculation With the center feed well the effluent is discharged along the outer wall of the clarifier tank Clarifiers with peripheral inlets will be designed with a center bottom liquid outlet Circular Clarifiers Engineered to Meet Your Needs

Gravity Thickeners Back to Product Search provided with a bridge which spans the tank diameter and carries the entire weight of the Thickener mechanism and the feed well Flow is brought into the Thickener through a pipe which may be either suspended from the bridge or brought through the side of the tank Overflow from the tank is

Gravity thickeners consist of a circular tank usually with a conical bottom that is fitted with collectors or scrapers at the bottom Primary andor secondary solids are fed into the tank through a center well which releases the solids at a low velocity near the surface of the tank

The compression regime is not well studied and since it normally operates only at the very bottom cone of the thickener it goes beyond conventional design requirements Theory of batch flux The development of the technique began with Kynch who modeled the settling of particles in water

Many thickener installations operate with water recovery below design limits largely through conservative control and low prioritization of thickener optimization The operation of the thickener must accommodate fluctuations – control for disturbances – in the process feed stream to deliver a clear overflow and thickened underflow

With the aid of polyelectrolytes coagulant sludge can be thickened to concentrations in the range 2–6 wv solids The polyelectrolyte dose can be in the range 01–1 gkg of dry solids and the dose should be applied proportional to the feed solids concentration and flow It should be well mixed using an inline static mixer or similar

Flocculants are used in gravity thickeners to improve the natural settling properties of solid particles present in the thickener feed slurry

The feedwell performance in gravity thickeners and clarifiers relies on the efficient mixing between solid particles and flocculant to achieve effective flocculation as well as energy dissipation of the incoming feed stream A population balancecomputational fluid

A circular thickener comprises a relatively shallow opentop cylindrical tank with either a flat bottom or a bottom shaped in the form of an inverted cone see Figures 12 and 13 The feed mixture is gently and continuously introduced to the feedwell in which exists a pool of settling suspension along with any additional coagulant or flocculant

Clarifiers and thickeners are essentially ide ntical units a clarifier produces clean water while a thickener concentrates a solids slurry as the desired product In this discussion thickener will be used to describe both units Also a gravity separation of solids from water is assumed to take place

Gravity belt thickener model selection is a function of hydraulic feed rate the Model G25 thickening system is generally appropriate for 05 to 10 waste activated sludge feed rates up to 125 GPM 79 literssec or 28 M3h and the GSC and GSCE series machines are appropriate for higher feed rates

Mar 02 2014 · The standard feed well for conventional thickeners is designed for a maximum nominal flow velocity of 15 mmin High turbidity caused by the depth of the feed well When overflow clarity is important or the solids gravity is close to the liquid specific gravity deep feed

characteristics of the thickener feed are well understood These present a dewatering problem for which gravity thickening provides a partial or preliminary solution The paper shows the

thickener feed externally Thickener feed dilution is an important facet of good thickener feed system design It can have a significant impact as to whether a thickener achieves its process performance targets as well as the overall cost of operation 40 YEARS OF ANODE CASTING Outotec is celebrating 40 years in the anode casting industry

Jan 26 2015 · The most common solidsliquid SL unit operation is thickening A wide variety of thickeners are used including conventional deep well paste high rate and clarifiers which is a thickener subclass used for removing solids from turbid or very low solids waters

The Difference Between a Clarifier and a Thickener is subtle as they will visually look the same Fundamentally thickeners and clarifiers are both used to settle solids which results in the separation of liquids and solids Thickeners are used to concentrate solids while clarifiers are used to purify liquids A thickener will give you a high density underflow while a clarifier will not The

Gravity thickeners are more functional on primary solids than secondary Mechanical thickening is usually done with either a rotary drum gravity belt DAF or centrifuge but a good three belt press can dual function as a thickening device by utilizing the gravity deck portion of

2 GRAVITY THICKENING 21 General description of the unit The gravity thickening design is similar to a clarifier Thickeners are usually circularshaped the feed is carried out through a pipe to a central hood serving as distribution and still area with a height that has no

Apr 02 2020 · Gravity Sedimentation Thickeners And Clarifiers a concentrated slurry is mixed with a solution containing fewer solubles than the liquor in the slurry and then is fed to the thickener As the solids settle they are removed and sent to the next stage referred to as a siphon feed system The feed enters the central feed well through

Gravity Thickeners Back to Product Search provided with a bridge which spans the tank diameter and carries the entire weight of the Thickener mechanism and the feed well Flow is brought into the Thickener through a pipe which may be either suspended from the bridge or brought through the side of the tank Overflow from the tank is

Drum Thickener PRS reliable thickening and dewatering of pulps The performance of the gravity drum thickener is based on 50 years of pulp dewatering experience The Drum Thickener PRS is a simple cost efficient and reliable filter for dewatering stock and broke virgin and recycled fibers in a consistency range of 05–50