Isea Grease Trap - Pre-treatment Of Gray Water Sewage

GREASE TRAP/ SAND TRAP

PRODUCT CATEGORY

GREASE TRAP PRODUCT NAME

GREASE TRAP APPLICATION

PRE-TREATMENT OF KITCHEN AND DOMESTIC WASTEWATERSOLIDS REMOVAL FROM MIXED WASTE-WATERS CAPACITY

Certified Quality System

TE

LI

NT E D

E

PA

FROM 900 TO 1500 MEALS (FROM 200 TO 400 INHABITANTS EQUIVALENT

C E NC

DESCRIPTION ISEA grease trap is a receptacle entirely made of high density polyethylene and suitable for restaurants, canteens, hotels, food processing establishments, industrial laundries and different type of light industrial facilities. Grease traps are important components in wastewater treatment and are utilized for the preliminary treatment of gray water sewage coming from kitchen sinks, washing machines, wash tubs and showers. The volume of a grease trap tank is designed to provide an adequate residence time of the incoming wastewater. During this period fats, oils and greases (FOG) are separated from the water by the physical process known as flotation which takes place because the specific weight of these substances is equal or less than the one of the water, therefore in non turbulent conditions, they float on the surface of the tank from where they can be easily removed. Inside grease trap also sand, debris and other suspended solids are separated from the water and having a greater specific weight they settle on the bottom of the tank. ISEA’s grease trap is provided with PVC inlet and outlet piping. Access to the plant is by two inspections portholes, one in the flotation chamber and the other by the outlet pipe. Both ports are protected by screw-on covers.

INSTALLATION EXCAVATION

Dig a hole of appropriate dimensions. The bottom of the excavation must be leveled and compacted with a 10 cm layer of fine sand (grain size 0-5 mm).

BACKFILLING

Fill the tank with clean water before backfilling to avoid collapse of the polyethylene structure during backfilling. Once the tank is full, dump sand around the tank and level it. For a walk-on solution build a 5 cm thick light concrete layer on top of the tank and finish with a 40 cm thick soil. For a drive-on solution a reinforced concrete slab is required to protect the tank. Accessible manholes are required for inspection and maintenance.

PIPING AND FITTINGS

PVC pipes and fittings are utilized for connecting the grease trap to the inlet and outlet lines.

PERIODIC CHECKS AND MAINTENANCE

Periodically verify that no large bodies obstruct the sewage inlet or outlet by opening the inspection ports. Also, check that no sand obstructs the outlet pipe. At least once a month check that the grease is not lower than the outlet pipe. Floating material must be removed periodically using a specialized company and disposed in appropriate sites.

USE

72

screw-on leads

E

b

DIMENSIONS & DESIGN

U

grease

a

grease removal

HE ØE

HU

ØU

inspection cover

H

inert material

D

GREASE TRAPS / SAND TRAPS Code

Item

E.I.

Seats

D

(cm)

H a (cm) (mm)

øE

øU

Q

HE

HU

(mm)

b

V grassi Vr.i.* (m3)

(m3)

(mm)

(mm)

(l/sec)

Weight (Kg)

(cm)

(cm)

0416

TIPO 6000

200

900

215

215

200

400

2,9

2,7

160

160

5,0

180

173

168

0417

TIPO 8000

250

1000

215

260

200

400

3,7

3,4

160

160

7,0

200

217

212

0418

TIPO 10000

300

1100

215

300

200

400

4,5

4,0

200

200

10,0

265

251

246

0419

TIPO 15000

400

1500

225

440

200

400

7,0

5,0

200

200

15,0

405

400

394

* Total inert material volume

Main parameter for system design is hydraulic retention time (Tr=V/Q). This is fixed in order to have lighter substances separation. Retention time is different, according to sewage type or its grease content. Other parameters need to be checked. These are: effective surface (Se=Q/V) and the net volume (Vu=cxQ) for the grease collection.

INFO Performance: The grease trap is designed in accordance with DIN 4040 and ISEA guarantees the removal of 90% of the floating materials.

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