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Explanation: There is nothing wrong with the source text.
The 'eaux usées' in this case are the 'eaux grsies', i.e. kitchen / sink / bath waste (as distinct from 'eaux noires' = sewerage).
In traditional dual septic tank systems, these 'eaux grises' pass first through a grease trap before joining the toilet waste in the septic tank, thus avoiding the 'grease' upsetting the action of the septic tank, and also, clogging up the soakways. Obviously, proper maintenance of the grease trap is necessary (i.e. emptying), otherwise it simply overflows and runs into the septic tank anyway, defeating its purpose!
More modern systems are referred to as 'toutes eaux', and all the waste water, 'grises' and 'noires', passes into the S/T together; in practice, this doesn't seem to cause many real problems. And at least it eliminates the grease trap, which needs regular emptying and can be a cause of problems!
-------------------------------------------------- Note added at 41 mins (2011-11-20 18:15:59 GMT) --------------------------------------------------
Of course, this isn't strictly speaking 'grease' as such — it's a foul-smelling slimey sludge consisting of soap, detergents, etc. as well as the grease.
-------------------------------------------------- Note added at 42 mins (2011-11-20 18:17:13 GMT) --------------------------------------------------
These are not, as you seem to be implying from your question, containers destined to recover cooking fat.
I did think the "bac" was part of the wastewater system - your explanations confirmed that and "trap" is a better suggestion for sure. 4 KudoZ points were awarded for this answer
following on from Tony's comment "these are not containers destined to recover cooking fat"; they are reservoirs with a minimum size of 100 litres generally, sometimes a lot more in the case of a large 'industrial' kitchen.
I think "bacs à graisse, eaux usées". Fats are recovered separately and removed y specials trucks to be used as fuel, etc.
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Answers
40 mins confidence: peer agreement (net): +5
bac à graisse des eaux usées
waste water grease trap
Explanation: There is nothing wrong with the source text.
The 'eaux usées' in this case are the 'eaux grsies', i.e. kitchen / sink / bath waste (as distinct from 'eaux noires' = sewerage).
In traditional dual septic tank systems, these 'eaux grises' pass first through a grease trap before joining the toilet waste in the septic tank, thus avoiding the 'grease' upsetting the action of the septic tank, and also, clogging up the soakways. Obviously, proper maintenance of the grease trap is necessary (i.e. emptying), otherwise it simply overflows and runs into the septic tank anyway, defeating its purpose!
More modern systems are referred to as 'toutes eaux', and all the waste water, 'grises' and 'noires', passes into the S/T together; in practice, this doesn't seem to cause many real problems. And at least it eliminates the grease trap, which needs regular emptying and can be a cause of problems!
-------------------------------------------------- Note added at 41 mins (2011-11-20 18:15:59 GMT) --------------------------------------------------
Of course, this isn't strictly speaking 'grease' as such — it's a foul-smelling slimey sludge consisting of soap, detergents, etc. as well as the grease.
-------------------------------------------------- Note added at 42 mins (2011-11-20 18:17:13 GMT) --------------------------------------------------
These are not, as you seem to be implying from your question, containers destined to recover cooking fat.
Tony M France Local time: 02:32 Specializes in field Native speaker of: English PRO pts in category: 319
Grading comment
I did think the "bac" was part of the wastewater system - your explanations confirmed that and "trap" is a better suggestion for sure.
The translation workplace 
peer agreement (net): +5