Decantatori a Pacchi Lamellari Flowpack

Flowpack Lamella-Pack Decanters

for sludge settling

A simple and very efficient solution: in lamella-pack decanters, solids-water separation is achieved through a dense network of channels, inclined at 60° to accelerate the settling of suspended solids.

High Efficiency.

High Efficiency. Due to the increased sedimentation area allowed by lamellar packs, compared to similar solutions, these devices increase the overall efficiency of wastewater treatment plants.

Very low pressure drop.

Very low pressure drop. Effect of efficient distribution of effluent through lamellar packs.


Modularity. Multiple decanters can be easily installed if the performance of the treatment plant needs to be scaled up.

Space saving.

Space saving. This is enabled by their compact design, which optimizes the use of water treatment facilities.


Cost-effectiveness. Lamella-pack decanters are an economical solution to improve the efficiency of wastewater treatment processes.

Ease of installation and operation.

Ease of installation and operation. Smooth operation and low maintenance requirements simplify system operation, resulting in economic benefits.

Lamella-pack decanters: description and operation

Lamella-packs are modular elements, composed of channels of different sizes, used in different solutions to increase the useful wastewater treatment surface area. In particular, lamella-pack decanters are designed to efficiently separate suspended solids, by settling (i.e., gravity), from the water thus clarified.
It is thus a process that can also be called separation, desanding, clarification or clariflocculation (i.e., in the latter case, clarification with the addition of chemicals).

But how do Lamella-Pack Decanters work? The process can be broken down into these key steps.

  1. Injection of wastewater, loaded with suspended solids, in the middle of the tank. Some septa or distributors evenly distribute the flow of raw water.
  2. Lamella packs, with channels of different sizes depending on the consistency of the effluent to be treated, separate the suspended solids from the water.
  3. Sedimentation. Due to the higher density of the sludge flocs compared to water, and due to the inclination of the lamellar packs(60°), the flocs themselves rapidly decant toward the bottom of the hopper. They will then be removed, when they accumulate in defined quantities, so as not to decrease the efficiency of the process.
  4. The clarified water, now free of suspended solids, is at the top of the decanter and overflows into a collection channel. From here it is conveyed to subsequent treatments or, eventually, to the final discharge.

The decantation process with lamellar pack solutions is widely used, in both civil and industrial wastewater treatment, as a consequence of other biological or chemical-physical processes: speaking of civil wastewater treatment plants, it is therefore a stage of a secondary treatment. In the case of industrial installations, it is necessary to define, as always, incoming effluent quality and desired output according to local regulations: in this way, lamellar pack decanters can be evaluated as a stand-alone solution or in combination with additional technologies (both upstream and downstream).

MITA Water Technologies has decades of experience with the design, manufacture, and marketing of reed pack decanters. Several possible types of lamella packs are available, depending on the quality of the effluent. In the monobloc version, the wetted parts are made of treated and painted carbon steel, while the overflow channel is made of AISI 304. Special materials and executions are available upon request. The supply of the lamellar pack only involves insertion into a stainless steel retaining frame of appropriate thickness.

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    Application Field:

    Case studies with lamella decanters

    Upgrading of existing biological clarifiers

    Biological wastewater treatment plants in need of upgrading after a period of time are becoming increasingly common. Decantation is the stage that most manifests this need and is also the one that requires the most setups. Flowpack lamellar pack decanters with containment frames have been developed to meet these needs. They allow rapid installation within existing sedimentation tanks, increasing their useful surface area without major changes to the structure of the clarifier itself. The same type of lamellar packs have also been used in newly constructed concrete tanks. Due to their special structure, their application allows large settling surfaces to be obtained in reduced layouts.

    Decantatori Lamellari con Chiarificatori Biologici
    Decantatori Lamellari per Fanghi Chimico-Fisici

    Chemical-physical sludge decanting

    Process water from manufacturing companies can be identified by the characteristics it can take on depending on the type of production and its use in the production cycle. The treatment of this water is done through the dosing of chemicals, different depending on the substances to be removed. Sludge produced by chemical treatment is readily removed by decanting with Flowpack lamellar pack clarifiers. In the monobloc version, they allow:

    • ease of shipping and installation,
    • extremely small layout,
    • high settling surface area (˜ 20 m2/m3),
    • modularity,
    • low energy consumption.

    Different materials of construction allow optimal adaptation to the characteristics of the effluent. Simple operation and limited maintenance requirements have simplified plant operations with significant economic benefits for the end user.

    Biological sludge settling

    In small biological wastewater treatment plants, the Flowpack one-piece lamellar decanter has been installed in place of traditional settling systems. In fact, the one-pack version requires no civil engineering structure and allows for rapid installation and equally rapid start-up. The reed pack was specially designed with the type of sludge in mind to avoid any risk of clogging. Other advantages that favored the choice of Flowpack: the modularity of the system, reduced layout, and ease of management and operation of the system.

    Decantazione Biologica dei Fanghi
    Decantatori per Precipitazione di Idrati Metallici

    Precipitation of metal hydrates

    One of the most common industrial wastewater treatment processes aims to remove metals. The separation of metals occurs by precipitation: appropriately increasing the pH of the effluent water results in the formation of metal hydrates, which separate from the water by precipitation. Flowpack lamellar pack sedimenters have been used to accelerate the phenomenon of metal hydrate separation as an alternative to traditional sedimentation systems, compared with which they have the advantage of ensuring small size and rapid installation.

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