FREQUENTLY ASKED QUESTIONS

Is the LFC biodigester noisy?


No. The LFC motor turns the food only for a quarter of the time. The rest of the time there is little source of noise. We use a large motor that is not under stress and it therefore operates quietly. When the motor is turning, the A-weighted sound pressure measured at one metre varies from 68 dBa (for the LFC-500 biodigester) to 73 dBa (for the LFC-50 biodigester). The smaller LFC biodigesters are louder because they use a single phase motor. When the motor is not turning, but water is being injected, the sound level is 42 dBa. When no water is being injected and the motor is not turning, the sound is zero; this is the case typically for 75% of the time.




Does the biodigester smell?


No. The air quality is unaffected by the LFC biodigester. Ordinarily, there are no smells from the LFC biodigester. The door of the LFC biodigester is sealed, so moisture and heat are kept in the LFC biodigester.




Is the LFC Bio-digester chopping, grinding or compacting the waste food?


None of these. The LFC biodigester is digesting the waste food, like a stainless steel stomach. The LFC drum (the “stomach”) periodically mixes new waste food, old waste food, water, oxygen and microrganisms. The waste food is decomposed and primarily produces water, CO2 and heat.




Does the LFC Bio-digester only process in batches?


No. You can add waste food at any time. The machine is constantly digesting the waste.




How often should I add the 'Powerzyme'?


The 'Powerzyme' contains a living organism; as long as it has food and water it will survive inside the drum. More 'Powerzyme' will need to be added - a cup full - after a shut down period, or once a year to top up the levels.




What is the BOD 5 load?


Since the food waste has been aerobically digested over a period of 24 hours, the effleunt BOD 5 value is very low - 300-500mgL. The additional load is the equivalent to approximately one extra crew person onboard.




Is the effluient safe to dispose of overboard?


Recent correspondence with the flag state, in colaboration with Lloyd's Register, allows the effluent to be classed under MARPOL annex IV as 'other drainage'. Thus allowing it to be treated by the vessels's sewage treatment plant and safely discharged.




What size is the smallest Bio-digester?


The LFC 25 is smaller than a standard Dishwasher. This unit can handle 25kg of food at any one time and can be continually loaded after every service or food preparation.




How long does it take to fit?


The same time it would take to fit a dishwasher, not very long.




Does it need a grease trap?


A grease trap is not required.