Sedimentation with lamella settlers
Inclined lamella settler are a state of the art technology in water and wastewater treatment. The Technology is used in a vast variety of sedimentation processes
The operating principle of lamella settler is based on a reduced particle settling path.
The related laws of sedimentation have been defined by Allan Hazen in 1904
Potable water treatment, Industrial-rapid-settling, Primary settlers, Secondary settlers, storm water treatment
Reduced Tank size
The required tank size is significantly less compared to conventional settlers
Lamella settlers are build in a variety of configurations. Different functional zones can be identified in typical lamella settling tanks.
The Inlet flow (1) runs against a buffer wall (2).
Energy gets dissipated in the inlet area(3). Subsequently the flow continues to the underflow section (4) where it is evenly distributed to the lamella tubes (5)
Particles collect on the lower lamella plane and collectively slide down due to the inclination.
Clarified water leaves the tube-settler on the upper side and gets collected in an effluent drain (6) that reaches outside the tank where the effluent falls into the collection channel (7).
The particle loaded sludge (8) collects on the tank floor and moves towards the sludge pump (9) with the help of a scraper system.
The HEWiTUBE Lamella ´system consists of individual profiles with a tongue and groove system
The modules are rigid and self-supporting , hence it can placed directly on a support structure
Variable Module sizes
HEWiTUBE modules can be produced in almost any size depending on the project requirements
The settling performance follows Hazens law thanks to the equidistant settling planes
Optimized Sludge movement
The settled sludge moves to the Chevron center line and allows the individual particles to slide down as a dense particle flow
Certified for use in potable water
The HEWiTUBE blue series is certified in accordance to KTW/W270 (German standard) and NSF (US-standard)
Simple on-site assembly
Modules can be assemble on site on a special assembly table
HEWiTUBE LS 50 is used for following applications:
Potable water treatment
Separation of flocculated particles from surface water sources
Humus tanks after trickling filter or submerged beds
Separation of biological flocs with low sludge volume
Storm water treatment
For the reduction of the surface overflow rate in small tanks
Separation of mineral particles and flocculated particles in process water treatment
|Technical data: HEWiTUBE LS50|
|Specific settling surface (60°): 11 m2/m3|
|Lamella pitch: 45mm|
|Technical data: HEWiTUBE LS84|
|Specific settling surface (60°): 6,5 m2/m3|
|Lamella pitch: 80mm|
HEWiTUBE LS84 is used in applications with larger particles and higher sludge volume
Fort he increased performance of primary settling tanks
For activated sludge up to ~ 2500 mg/l MLSS and SVI < 120 mg/l
Combined sewer outlet
Installation into tanks prior to outlets
Installation into rectangular tanks
A rectangular shape is a perfect precondition for the installation, since the surface can be completely utilized
The modules can be placed upon a support structure below the modules, or the modules are connected to a support structure at the upper module level
Installation into round tanks
The performance of larger round tanks can be drastically increased by ring section of HEWiTUBE modules along the perimeter..
The modules are hang into wall consoles. Buffer wall segments and effluent launders are connected to wall consoles as well
The design of HEWiTUBE lamellas requires a hydraulic calculation and a support structure design.
We offer a complimentary hydraulic design based on Hazens laws in order to determine the required lamella volume.
If required we offer a design study for effluent launders as open through with V-notch weirs or as submerged effluent pipe
Example effluent drain
open through 22m long ; 40 L/s
We offer a project specific support structure components including beams, brackets and other required components made of stainless steel or FRP
Example of a below-module support structure