In a nutshell: Food waste and other rubbish must be removed as soon as feasible, as they can be  a direct or indirect source of contamination, such as contaminating surfaces that food is prepared on or attracting pests.

Proper disposal of waste can help prevent cross-contamination of food and pest infestation while maintaining good hygiene.

Waste oil 

There are physical or chemical contaminants in used or recovered waste oil. To limit the possibility of contaminating edible oil, waste oil must be collected in the following manner in suitable containers:

Sewage

Since waste water contains a significant number of microorganisms, the drains must always be kept clear to avoid the formation of off-odours:

   

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