MIL-HDBK-1138
traps are not clearly identified and implemented, the traps are
ineffective. It is recommended that waste be pumped out of the
grease traps rather than dissolved with solvents. Grease and
solvents may have a negative impact on the wastewater collection
and treatment system. Recovered oil and grease from food-service
operations can typically be sold to a local rendering company.
Other types of oils can often be reclaimed by recyclers. If
proper maintenance cannot be maintained, consideration should be
given to removing the grease trap and having the user separate
the grease before discharging wastewater to the sanitary system.
4.2.1
Pump-Out Frequency. The recommended pump-out
frequency ranges from every 2 weeks to every 3 months, depending
on the waste characteristics of the establishment and the size of
the grease trap. The necessary pump-out frequency can be
determined by checking the grease retention capacity in the
grease trap. Grease and accumulated wastes should be removed as
often as necessary to maintain as least 50 percent of the grease
retention capacity.
4.2.2
Maintenance Specific to Manufactured Grease-
Removal Systems. In addition to periodically removing the waste,
review and implement the manufacturer's recommended maintenance
procedures for all grease-removal systems.
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