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Alisea News


Legionellosis risk at schools: how to prevent it?

Legionellosis often represents a not considered risk in biological risk evaluation of schools, but epidemics have been discovered in environments like schools, hotels and hospitals


Evidences of legionellosis in a Capannoli plant

Security measures has been immediate for the infected rooms. These measures have been activated by a major's decree to debilitate the dangerous bacterium

Working Method

There are several methods which can be performed for the reclamation of the system: ALISEA's technicians apply the most appropriate and effective one in relation to the structure, the type of dirt and the accessibility of the components to be reclaimed.

1) Technical Inspection

There are two types of Technical Inspection: the Preliminary type which is carried out in the event the Visual inspection does not manage to clarify all the doubts concerning the hygiene of the system or the type of corrective action to take and is aimed at obtaining a correct view of all the problems that the system has. The Conclusive type which follows the corrective action for maintenance, cleaning and sanitisation is carried out with the precise aim to document the results obtained in a comprehensive manner.
In both cases the method used by Alisea , requires complex analytical activity, including the following stages:

  • Technical-structural analysis of the system aimed at checking if it is still suitable to perform all hygienic functions for which it has been planned.
    In this phase any system anomalies are identified (e.g. perforated intake ducts, malfunctioning of the overall system control, etc…) the state of the filters ( through visual inspection of the level of fouling, recording running times, checking for any loss of filter material and leaks);
  • Filmed inspection of the internal surfaces and all the components of the system carried out (using special optical probes, fibre optic bore scopes, robotic equipment fitted with high resolution cameras) according to a significant statistical sample of its structure and extension;

2) Corrective Cleaning

This stage involves cleaning all system elements found to be in poor hygienic condition, according to the methods which are most suitable to the structural characteristics and to the type of residues found in the installation. In this phase the following activities can be carried out:

  • Cleaning the Extractor unit
  • Cleaning the horizontal and vertical intake ducts
  • Cleaning the Extractor Fans

Alisea, during more than ten year experience in the field, has studied and rendered operative more than a remediation system, because often the structure and accessibility characteristics mean that different technical solutions need to be found, each one being only effective on a specific part of the device. Among the work methods used by Alisea’s technical staff one could include:

  • The AliFoam Method: this method is based on the treatment of computerised endoscopic irroration of the internal surfaces, using an appropriate foam product which can dissolve all greasy and charred residues. Once dissolved, the residues are then removed by using an aspirator;
  • The AliSteam Method: this method is based on the use of an electronic saturated steam generator at 180 °C, together with very strong aspiration of the liquefied grease.
  • The AliDust Method: this method, particularly indicated in case of oily and humid residues, uses a special product with a very low particle size, which can absorb grease and remove it by aspiration.
  • The AliDry Method: this method consists in using a jet of dry ice whose temperature (down to -79°C) can solidify greasy residues and make them peel off the surfaces. Also in this case the residues are removed with a powerful aspirator.
  • The AliSkin Method: this method is used on surfaces where charred deposits are found which are difficult to eliminate. The application of a specific product, having a REI certification for its specific field of use, can prevent the combustion of these deposits making the system safe.
  • The NanoPrevent Method: is a method aimed at preventing grease from depositing on the internal surfaces of the system. This method uses a particular nanotechnological product on surfaces which come into contact with charred or greasy deposits. It is used to prevent deposits adhering to the surface thus making it possible to remove them by normal aspiration.

3) Health and Safety Certification of the system

In the certification phase reporting and advice activities are of prime importance in order to establish a strict regime of legal protection. For companies like Alisea S.r.l. who is UNI EN ISO 14001:2004 and UNI EN ISO 9001:2008 certified it is of fundamental importance that all the documentation and forms produced in this phase are inserted into the “Air Section” in the Environmental Management Manual.

4) Health-Hygiene and Maintenance Plan

In this phase a Health-Hygiene Maintenance Plan is created and drawn up, aimed at keeping health and safety parameters of the system high. All future health-hygiene and maintenance action the relative time frames are indicated in the plan.

5) Health, Hygiene and Maintenance Register

In this phase a Health, Hygiene and Maintenance Register is drawn up in which all ordinary and extraordinary work carried out on the system is recorded.

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