Cases study

Dust abatement plant for waste treatment and management

To abate dust emissions during the waste treatment and recovery stages, we used misting equipment capable of providing constant pressure with variable flow rate

Field of activity

Waste treatment

Activity

Collection, transportation, treatment, recovery and disposal of municipal and special, hazardous and non-hazardous, industrial, tertiary, public and medical waste.

Location

Central Italy

Emission criticality

Dust emission during waste treatment and recovery phases

Service supplied by Labiotest

Design and installation of new dust suppression system

Dust emissions in waste treatment

Waste management is one of the areas where emissions are most problematic. Although odorigenic emissions are commonly considered more critical, dust emissions pose an equally significant challenge.

In fact, several types of dust can be generated during waste treatment, depending mainly on the type of waste and the processes used in its treatment. Some of the most common dusts include:

  • organic dusts: resulting from the decomposition of organic materials in waste, such as paper, cardboard, food, etc.
  • inorganic dust: resulting from the fragmentation of inorganic materials such as glass, plastics, metals, etc.
  • combustion dust: generated during the burning of waste as part of incineration or pyrolysis processes.
  • dust from abrasion: from the friction and crushing of materials during waste shredding, separation and handling operations.
  • dust from chemical processes: generated during the application of chemical processes for waste treatment, such as the neutralization of harmful substances.

These dusts can contain a variety of compounds, including organic materials, inorganics, heavy metals, toxic and carcinogenic compounds. It is therefore very important to properly manage these dusts to avoid negative impacts on human health and the environment, as we did in the case of a company in Central Italy that specializes in the collection, transportation, treatment, recovery and disposal of various types of waste.

The cause of our client's dust emission

The operation of this company is divided into 3 plants where waste collection, storage and treatment are carried out.
They first decided to treat only 2 plants.

The emission problem was caused by the unloading and handling of some types of waste that generated a significant criticality of dust emissions.  

The proposed solution: variable flow rate misting systems

We suggested to the client that they install misting systems that could provide variable flow rate at a constant pressure so as to serve multiple independent nozzle lines.
This was made possible by a control panel that allows the system to be started and the relevant solenoid valve activated so that each line can be controlled by a suitable consensus. Depending on which lines are activated, the system delivers the required flow rate, keeping the pressure on the line constant at all times.

Specifically, we installed in the first shed an HPS Midi Var system with 4 solenoid valves to manage 4 ceiling lines with a total of 150 nozzles.
In the second shed, we installed two HPS midi var systems with 3 solenoid valves each to manage 30 and 90 nozzles respectively divided into 6 ceiling lines. 

The second intervention in the largest shed

Subsequently, the client decided us to proceed with dust containment in the third shed as well, where, in view of the size of the area subject to the criticality, we proposed a pole-mounted La.BioFog 400 system with a special anchoring structure to the columns

The results obtained

As a result of the installation of these systems, our client was able to achieve waste dust emission abatement efficiency of more than 60%.

The key to success in this case was in particular the use of misting systems capable of supporting a variable flow rate while ensuring constant pressure. This made it possible to optimize plant management by activating lines according to actual needs.

The customer confirmed to us that being able to manage the plant in such a way as to activate the solenoid valve by having each line specifically controlled to deliver the required flow rate was exactly what they needed to solve their dust abatement problem.