Isea Country - Absorbent Tray Subirrigation System

COUNTR Y

PRODUCT CATEGORY

ABSORBENT TRAY SUBIRRIGATION SYSTEM PRODUCT NAME

COUNTRY APPLICATION

TREATMENT OF CIVIL DWELLING MIXED WATERS CAPACITY

Certified Quality System

TE

LI

NT E D

E

PA

FROM 2 TO 24 INHABITANTS EQUIVALENT

C E NC

DESCRIPTION COUNTRY is the phytodepuration system designed by ISEA which utilizes the horizontal subsurface flow method for domestic sewage treatment. Pretreated wastewater is evenly distributed into absorbent trays where emergent rooted hydrophytes perform their natural phytodepuration process. The absorbent trays are watertight containers made of high density polyethylene with the typical truncated pyramid shape. Each tray has an absorbent bed area of 2 m² and is designed to serve one equivalent inhabitant. The absorbent trays are installed underground and filled with gravel and stones on the bottom, followed by a layer of geotextile and compost. The phytodepuration systems are particularly suitable for small residential communities not connected to the sanitary sewer network. The system does not include any electrical equipment and requires very little maintenance. A complete COUNTRY plant includes: • A BIOLOGICAL IMHOFF tank for pretreatment of black waters; • A GREASE TRAP for pretreatment of gray waters; • A MANHOLE (35.5 cm x 80cm) with cover for inspection; • A NUMBER OF ABSORBENT TRAYS which is equivalent to the average daily flow; • A FINAL MANHOLE (35.5 cm x 80cm) with cover for inspection.

INSTALLATION

EXCAVATION

Dig holes to accommodate the Biological Imhoff tank and the Grease Trap as described in their specific technical papers. For the absorbent trays dig a perfectly horizontal trench 80 to 120 cm deep and wide enough to allow the installation. Place on the bottom of the trench a layer of compacted fine sand (0-5 mm) or other inert material and install the absorbent trays and relevant piping.

FILLING

Fill the Biological Imhoff Tank and the Grease Trap with water. Fill the absorbent trays with the following layers: • 10-15 cm layer of stones; • 30 cm layer of gravel; • 20-30 cm layer of compost.

BACKFILLING AND FINISHING

Backfill the area with the originally excavated material and a top layer of compost to allow the vegetation to grow.

START UP

Check that the installation has been done correctly. Proceed to plant broad leaved evergreen plants with high water uptake capability. (See attached list)

CHECKS AND MAINTENANCE

Periodically remove and dispose of the contents of the Grease Trap and the Biological Imhoff tank.

USE

26

max 30 cm

80 cm

120 cm

35 cm

35 cm

160 cm

SUGGESTED VEGETATION water inlet from Biological Imhoff tank water inlet from grease trap

earth geotextile gravel and stones

absorbent tray

cm 55

Auruncus Sylvester Astilbe Elymus Arenarius Felci Iris Pseudoacorus Iris Kaempferi Lythrum Officinalis Nepeta Musini Petasites officinalis

cm 80

FLOWERS

Aucuba Japonica Bambù Calycantus Florindus Cornus Alba Cornus Florida Cornus Stolonifera Cotoneaster Salicifolia Kalmia Latifolia Laurus Cerasus Rhamnus Frangula Spirdea Salicifolia

cm 45

PLANTS

ø 110

initial manhole

ø 110

ø 110

final manhole

line continues to the end of the designed layout

INFO ISEA guarantees the complete treatment of the influent in accordance with the following standards: • Italian: D. L.vo 152/99 • European: Cee 271/91 27