Microbial Inactivation by microwave treatment - Bertin medical Waste

    Microbial Inactivation by microwave treatment

    The microwave technologies for treatment of bio-hazardous medical waste is validated and recommended by the World Health Organisation (WHO) as a safe, efficient and cost-effective treatment method. The Sterilwave by Bertin allows the shredding and sterilization in one single vessel of any type of bio-hazardous waste without prior segregation of the input waste. Without water and rejection of liquid effluent to drain, our innovative technology is pressurless and comply with all international requirements for medical waste management with biological risks.

    The Sterilwave solution for disinfecting biomedical waste is based on microwave technology, which is the most eco-friendly method available. This technique allows microbial inactivation of biomedical waste in 30 to 35 minutes.

    Unlike autoclaves, this process does not require pressurisation, and this minimises any risk of explosion due to poor maintenance and training of operators. All types of biomedical waste (solids, liquids, glass, sharps, blades, etc.) can be treated with the system, and the entire process is traceable. Besides the rapid and effective decontamination of biohazardous waste to an inactivation level greater than 8log10 (sterilisation level), the Sterilwave also converts biomedical waste into dry, inert material and reduces its weight by more than 25% and its volume by 80%. This resulting material is similar to municipal waste and can also be used as secondary fuel with a high energy output.



    8log10 microbial inactivation


    No pressure during the process
    No irradiation risk


    No water consumption
    No steam generator
    No liquid effluent


    Efficient heating rise up to 110°C for 20’
    to obtain a full decontamination


    Adapted to any type of medical waste (sharps, glass, solid, liquid…)
    No segregation


    Easy maintenance
    Equipment based on mechanical technologies


    Microbial inactivation by microwave treatment - Process description

    The Sterilwave technology automatically converts infectious waste into municipal waste within its tank and in 30 minutes.

    Incineration has been the most widely used method for treating infectious waste. However, biomedical waste incinerators release a wide variety of pollutants in the air, including organic compounds such as benzene, chlorophenols, polycyclic aromatic hydrocarbons (PAHs), vinyl chloride and dioxins, heavy metals (mercury, arsenic, cadmium, chromium, lead, etc.), acid gases (hydrogen chloride, hydrogen fluoride, sulfur dioxide, nitrogen oxides), carbon monoxide, and particulate matter such as fly ash. Pathogens can also be found in the solid residues and exhaust gases of poorly designed and poorly used incinerators.

    For the treatment of solid biomedical waste (and liquid waste packaged in suitable packaging / containers), there are alternative heat treatments so-called “low temperature” incineration by dry or humid heat. These decontamination technologies must be combined with mechanical methods such as shredding or crushing, to destroy pathogens. The shredders improve the rate of heat transfer and expose more waste surface for processing.


    As it uses the microwave technology, Sterilwave is the easiest, most efficient and economical solution to manage medical waste onsite.

    Waste management methodWaste output Weight reduction Volume reduction Immediate installation
    No specific construction required
    Zero effluents
    No polluting emissions
    AutoclaveSome modelsSome models
    Chemical treatmentSome modelsSome models

    The best alternative to autoclave and incineration solutions – detailed comparison:

    TechnologyTemperature under pressure over 130 °C Require a steam-powered generatorIncineration on specific location. Require special carrier (expensive)Based on microwave technology, simple and efficient (heating at 100°-110°C) More efficient than Autoclave technology ( confirmed by OMS)
    Pressure / authorization Risk in case of error

    Working under pressure (several bars of saturated steam);
    Specific authorization to work under pressure;
    Require many maintenance tasks;
    High risk in case of human error

    NCAmbient pressure Safe to operate and maintain Limited Risk in case of Human error
    Integrated grinding systemSlow shredding <20 mm output sizeNoYes by rotate blade: 1500 RPM <10mm output size
    Disinfection efficiencyfrom 5 log to 8 log10 (depending the brand model)Complete destructionOver 8 log10 more than 6 log 10 for virus
    Output Waste after treatmentVolume reduction up to 80%;
    Wet waste;
    Increase of the weight 20% due to water and steam
    Complete destruction AshesVolume reduction up to 80%
    Dry Waste
    Weight reduction of 25%
    Easy to recycle
    Operation costCost for energy, water, spar parts and consumablesCost for Energy, filters, maintenanceLowest running cost for consumables, energy and maintenance
    Environmental impactMedium
    Require important volume of water
    Liquid effluents
    Special carrier of ashes always requested
    POPs, Toxins
    On-site waste treatment
    No effluents
    Volume and weight reduction of the treated waste
    Only require electricity


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