Attachment 4: GTWPP Process Description

Attachment 4
Wastewater Pretreatment Plant (WWPP) Chemical Treatment Process Grease Trap Wastewater Pretreatment Plant (GTWPP)
PROCESS DESCRIPTION: The Grease Trap Wastewater Pretreatment Plant (GTWPP) is designed to remove the oil and grease in the Bureau’s Annex cafeteria wastewater discharge. The influent to the GTWPP consists of a waste stream that is composed of detergents, rinse water, food solids, non-food solids, oils and grease. The grease trap is located in Room 156-1A. The wastewater enters the system by gravity flow through a set of basket strainers, which must be manually cleaned as needed to prevent backup of the system. After passing through the strainers the wastewater enters the main chamber. Inside the main chamber there are paddles, heating units, transfer screens, and troughs connected to drums with piping. The heaters and moving parts are controlled by timers mounted in the room. The Contractor may adjust the timer settings to optimize the operation of the unit. Any changes must be documented in the log book.
PROCESS OPERATION: The Contractor shall operate the GTWPP with prudent engineering and operating practices. Operating the GTWPP includes, but is not limited to, the following tasks:

Att. 4

(1)

The Contractor will examine the operation of the grease trap, complete a base line cleaning, and propose a schedule for routine cleaning.

(2)

The Contractor shall legibly document the cleaning and
maintenance/repair of equipment during each visit and provide a copy to the COR when requested.

(3)

The Contractor shall clean the walls, floor, and the exterior of the equipment on a regular basis to the satisfaction of the COR.

(4)

The Contractor shall clean the troughs from the screens, and the pipes leading to the drum that collect the used grease/oil. The Contractor shall dip any floating oil/grease from the top of the reservoir, and dispose in the oil collection drum before starting to clean the grease trap.

(5)

The Contractor shall assure that the grease trap is operating as per manufacturer’s recommendations and in accordance with prudent operating practices.

(6)

The Contractor shall maintain the equipment in a clean and operational manner to meet the satisfaction of the COR.

(7)

The Contractor shall assure that the electrical elements are cleaned during each cleaning.

(8)

The Contractor shall examine the premises and satisfy himself with the

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Attachment 4
conditions which would in any manner affect the work under the contract,