Grease Trap

Common wastewater from the kitchen sink contains small amounts of Fats, Oil, Grease and Solids (FOGS) which enter grease trap.  The solid food particles sink to the bottom while the lighter grease and oil floats to the top and form a floating scum layer. The latter is very slowly digested and broken down by the microorganisms during the aerobic digestion process.

The relatively grease-free water is then fed into an absorption pit. The food solids at the bottom and floating oil and grease must be periodically removed. A traditional grease trap is not a food disposal unit. Unfinished food, gravy and sauces must be scraped into the garbage or food recycling bin.

INSTALLATION PROCESS

Respect the following steps when installing a Duraco grease trap:

Step 1: Location: –

Determine a suitable area to install the grease trap. The unit must be place in an outside area near the kitchen sink and accessible enough for regular maintenance.

Step 2: Connection: –

The Grease trap has only two connectors. The inlet should be connected to the sink pipe and the outlet to the absorption pit.

Step 3: Excavation: –

Dig to a depth that will allow the grease trap cover to come flush with the ground.

For domestic models (140, 200 and 350 L) allow 160mm around the tank. For industrial models (1,800, 3,000 and 4,700 L) allow 230 mm on both sides and both ends of the tank.

Step 4: Bedding: –

Allow for a minimum of 150 mm of compacted bedding material rock sand. Bed the grease trap and make sure it is placed levelled.

The grease trap is supplied with PVC sleeves at the inlet and outlet. The inlet and outlet pipes should be glued to the sleeves using standard PVC glue.

Step 5: Backfilling: –

Ensure the tank lid is properly screwed on the grease trap. Fill the tank with water through the inlet as you backfill, keeping the water level even with the backfill level. This will prevent possible distortion of the tank and its manhole. Do not remove the lid until the end of the backfill process.

Backfill in layers of 200 mm at a time and properly compact each layer. Ensure to compact each end first. Compact the backfill under the inlet and outlet before fixing the pipes.

For the industrial models, the maximum backfill over the top is 300 mm.

NOTE: In case the grease trap needs to be installed with more than 300mm of soil above its top, it must be protected by a heavy-duty concrete slab. THE SLAB MUST REST ON FIRM SOIL AROUND THE TANK

Step 6: Polyethylene (P.E) Extension: – (for industrial models ONLY)

In case the manhole screwed lid does not reach the ground level, a polyethylene extension will be required. Install the extension to the manhole outlet before starting the backfill process. Make use of Duraco extension EXCLUSIVELY. The screwed lid supplied with grease trap will fit the P.E extension.

Step 7: Drain Field Material: –

The home sewer drain needs to slope at least ¼ inch per foot downhill to the inlet of the grease trap and the outlet pipe must cater for a downhill slope of 1/8 inch per foot to the absorption pit. The absorption pit should be at a distance of not more than 3 m from the grease trap and its volume must be at least similar to that of the grease trap.

CAUTION

Failure to comply with the points below voids the warranty.

• Do not install any tank in water saturated clay or in high water table. The tank may collapse and its content will escape.
• Tanks are not fire-resistant. Do not store them near an open flame or heat in excess of 180°F,
• Do not install any tank under the path of vehicles or heavy equipment unless protected by a heavy-duty concrete slab, without resting on the grease trap.
• When the grease trap is pumped for normal maintenance; it should be refilled immediately.
• Our grease trap is designed for underground use only.
• Protect the tank from sharp objects which could cause leakage.
• Avoid abusive use of detergent.