Wastewater treatment handbook

18 ø 100 ø 100 cm 80 cm 55 cm 160 cm 45 cm 100 cm 150 Suggested plant allocation ø 110 Subirrigation plant with absorbent polyethylene trays, COUNTRY, consisting of: Biological Imhoff tank on the black water line, made of pe. Grease trap on the gray water line, made of pe. Initial pe manhole, 35,5 cm h=80/120 cm, with cover, where pre- treated water arrives. N.............. Absorbent trays, made of pe, with their peculiar truncated pyramidal shape, each of them 120 cm wide, 160 cm long, 55 cm high non-woven fabric, seals Ø 100 and Ø 110, polypropylene pipes to con- nect all trays provided. Final pe manhole, 35,5 cm h=80/120 cm,with cover,with an overflow pipe excess rain water discharge. Install biological Imhoff tank and grease trap as described in their specific technical papers. Outlet pipes from biological Imhoff tank and grease trap are to be connected to an inspection chamber, then to the initial manhole. Absorbent trays are water tight in order to avoid pollution of the underlying water table. Trays are to be Verify that installation has been carried out correctly. Plant evergreen plants with a develo- ped enough root apparatus (a list is given herein). The absorbent tray system is based on the earth capability to evapo-transpirate water, but also on the plant capability to evapo-tanspirate installed so to have their bottom no deeper than 60/80 cm from ground level. They need to be filled with different layers: - first 10-15 cm thick stones layer - second 30 cm thick gravel layer - third 20-30 cm thick earth layer it and to use up nutrients which are contained in the water flow. Biological Imhoff tank and grease trap periodical cleaning is necessary in order to keep an high performance of the system. Pe products are guaranteed for 10 years against corrosion. INSTALLER ENGINEER (SPECIFICATIONS) USER I N S T A L L A T I O N I N S T R U C T I O N S a n n e x 1 water inlet from Biological Imhoff tank absorbing tray earth non-woven fabric gravel and stones water inlet from grease trap initial manhole line continues to the end of the designed layout final manhole www.baygar.com