Products
Tube Settlers / Lamella Settler
THERE
ARE IN BROAD TERMS TWO METHODS OF SEPARATING SOLIDS BY GRAVITY FROM A SLURRY:
Deep
depth sedimentation
Shallow
depth sedimentation
The
equipment discussed in the Sedimentation/Clarifier section belong to the deep
depth sedimentation category and the Lamella Settlers to the shallow depth
category. Both are designed to handle suspensions with low concentration
slurries and solid particles that exhibit free and independent settling (Stokes
law) before they are entering the the hindering zone. In both categories
laminar conditions are required to obtain a sharp separation between the
settling solids and the liquid so that the upward velocity of the liquid is
lower than the settling velocity of the finest solid matter. Since velocity is
directly related to surface area the larger the area the better the separation.
If the area is too small the upward velocity goes up and a fraction of fine
particles will migrate to the surface and report to the overflow so the surface
area is a critical factor in sizing. Comparing the two categories the periphery
depth of conventional clarifiers have a long sedimentation path of about 2-3
meters whereas the clearance between lamella plates, in analogy to depth, have
a short path of 5-10 cm.
The
first lamella clarifiers date back to early 1900 consisting of a bundle of
tubes and inclined plate lamella settlers were introduced around 1970 and are
commonly used in clarification processes such as:
·
Water
following physical-chemical treatment.
·
Tailings
in mining and metallurgical beneficiation.
·
Solutions
from gold leaching processes.
·
Wet
scrubbing effluents.
·
Effluent
treatment in pulp and paper mills.
·
Filter
backwash.
To
better understand the operating principle of a Lamella Settler Plant the
animation on the left demonstrates two cylinders that are filled with the same
suspension with one positioned straight up representing a conventional
clarifier and the other tilted at an
angle representing an inclined plate settler. As may be seen in the animation
it takes longer for the solids to reach ultimate density on the deep path of a
clarifier in comparison to the shallow path of a Lamella Settler.
The
Area of a Clarifier vs a Lamella Settler
As
mentioned in the introduction gravity settlers are sized on the basis of two
parameters, upflow rate of the liquid and settling area, so under equal
conditions the effective area for both clarifiers and lamella settlers is the
same. On a clarifier the settling area is the tank surface and on lamella
settlers it is the total area of the inclined plates projected on a horizontal
surface.
This
reduces the footprint of lamella settlers by about 90% as compared to
clarifiers and consequently less land is required.
Operating
Description
The
Lamella Settler Plant consists of 4 major compartments positioned along a
rectangular settler tank with an inclined backside at a slope of 45-60 degrees.
The
sections are:
A
central slurry feed launder with a feed connection.
Two
plate pack compartments with overflow launders that straddle the feed launder.
Each stack consists of a set of plates at an inclination of 45-60 degrees and a
clearance of 5-10 cm depending on the volume and sliding characteristics of the
settling sludge as it enters hindrance.
Two
overflow launders that connect to a box or a manifold with an overflow
connection positioned across the tank.
A
sludge hopper at the bottom of the settler tank with an outlet connection.
The slurry
enters through the feed inlet and directed down and sideways towards the two
plate stack compartments. As the slurry reaches the bottom end of the inclined
plates stack it turns upwards and enters between the parallel plates in a
laminar flow pattern. Here the free settling solid particles thicken to a
sludge that slides down the plates while the gradually clarifying liquid moves
up in a counter-current pattern. When the clear liquid reaches the to top of
the compartment it flows through orifices that ensure even distribution of the
flow across all the lamella plates.
ADDITIONAL
COMPONENTS
Upstream
the Settler- There are applications that flocculation improves the settling
rate of the solid particles and produces a clearer liquid by agglomerating fines.
In this instance a flash mixer followed by a slow speed mixer may be mounted
upstream the settler. The flash mixer brings in immediate contact both the
flocculent solution with the incoming liquid to ensure equal dispersion and the
slow speed stirrer builds the floc gently to avoid its breakup before entering
the settler.
SELECTION
CRITERIA
Advantages
Continuous
operation.
Due to
its small volume no need to allocate large storage when emptying.
No
drive nor mechanical parts.
Filling
and emptying time is short.
Small
floor area footprint.
Modular
design for future expansions.
Disadvantages
No
buffer volume for flow fluctuations which may cause resuspension of solids.
Many
surfaces for accumulation of scale and deposits.
No
storage capacity for the settled sludge.
Maintenance
We offer Lamella Plate Clarifier to achieve
solid-liquid separation by directing the liquid between a series of inclined
plates called lamella. To its horizontal projection the settling surface of
each plate is equivalent. Having up to ten times the clarification area of a
conventional circular settling tank stacking the inclined plates results in the
separator occupying the same floor space. In other words, for the same liquid
flow, the Lamella Plate Clarifier would occupy 1/10th the floor area of a conventional
clarifier.
Our
Lamella Clarifier Plant Manufacturer has established itself as a leading
manufacturer and exporter of impeccable quality Lamella Clarifier. Our Lamella
Clarifier Plant Manufacturer has carved a niche in the market in designing and
manufacturing highly efficient product, which is offered at industry leading
prices. Such type of Lamella Clarifier Plant Manufacturer provides an extremely
economical method to separate solids from liquids using gravitational energy.
Using high grade components and materials, we manufacture it perfectly for
extensive application in industrial as well as domestic settings. We offer
Lamella Plate Clarifier Plant in different capacities at industry leading
prices.
With
several cutting-edge options the contrasting conventional methods in clarifier
design approaches, the protocols and text establish criteria for
decision-making. The Lamella Plate Clarifier is specially structured for
possible consumers evaluating clarifier results for specific situations, for vendor’s
required demonstrating best design. The Lamella Plate Clarifier Plant is
inclusive and effective treatise accessible on wastewater clarification. To
approach the technologies and process of confidence It is also exposing
explanations will assist everyone, clarity, and understanding. The Lamella
Plate Clarifier Plant process is more important and plays the essential factor
in the primary treatment of water treatment plant.