Technical Data

1. TUNNEL
Rock mass class:	IV
Excavated cross sectional area:	approx. 250 m2
Rock mass loading:	250 kN/m²
Supporting resistance:	Rock mass carrying ring	280 kN/m2
	Shotcrete and reinforcement	300 kN/m2
	Anchors	120 kN/m2
	Total sum of supporting resistance	700 kN/m2
Anchors around the galleries:	10-15 pieces
Distance between the rows of anchors:	2-2,5 m
Length of the anchors:	4.5 / 6 / 7,5 m
Bearing capacity of the mortar anchors:	30 Tonnes
Stabilisation and Support System
1° layer	shotcrete 10-15 cm, welded wire meshes diameter 5/20/20, grouted anchors, N = 4,5-6,0-7,50m GEWI bar diameter 28 mm
2. layer	shotcrete 10 cm HS Cement, welded wire meshes diameter 5/20/2
Central gallery
Cross sectional area:	180 m2
Length:	325 m
Side Galleries
Cross sectional area:	250 m2
Length	403 m

2. CONSTRUCTIONAL PART
Aerated grit chamber and grease trap	2 x 200 m3
Preliminary clarifier	8 x 260 m3 = 2.080 m3 (retention period during dry weather flow approx. 1 h - lateral flow)
Denitrification basin	4 x 3.250 m3 = 13.000 m3
Aeration basin	4 x 6.350 m3 = 25.000 m3 (retention period during dry weather flow approx. 3.7 h - fine bubbly in depth aeration)
Final clarifier	8 x 1.400 m3 = 11.200 m3 (surface load during dry weather flow approx. 0.75 m/h - retention period during dry weather flow approx. 2.8 h)
TOTAL EFFECTIVE VOLUME:	50.000 m3
Service Building
Built over area:	approx. 2.700 m2
Excavated material:	Rock excavation	ca. 13.000 m3
	Loose material	ca. 12.000 m3
	Rock and slope stabilisation	ca. 3.000 m2
Need of:	Concrete	ca. 5.000 m3
	Lining	ca. 20.000 m2
	Ceilings	4.000 m2
	Reinforcing steel	ca. 400.000 kg
Gasometer
Effective volume	2.000 m3
Digestion Chambers
Effective volume:	2.000 m3
Excavated material:	Rock excavation	approx. 13.000 m3
	Loose material	approx. 7.000 m3
Need of:	Shotcrete	approx. 500 m3
	Anchors	approx. 2.000 m
	Welded wire mesh	approx. 3.000 m2
	Concrete	approx. 2.000 m3
	Reinforcing steel	approx. 150.000 kg
	Lining	approx. 5.000 m2
Concrete Works
Concrete	50.000 m3
Reinforcing steel	ca. 1.500 tonnes = approx. 4.160 mixer conveyor trucks = approx. 60 truck loads

3. THE PLANT
Catchment area	900 km2 = 10% of the total area of South Tyrol
Dimensioning principles:
Population Data
Hydraulic load	95.000 inhabitants and population equivalent respectively
Specific sewage flow rate per head	300 I/Day
Dry weather flow QDWF	570 I/s
Wet weather flow QWWF	1.140 I/s
Daily quantity of sewage	28.500 m3/Day
Biological load	130.000 inhabitants and population equivalent respectively
Biological load
BOD5 - loads	Specific load value	60 g/Day
	Daily load	7.800 kg/Day
COD - loads	Specific load value	110 g/Day
	Daily load	14.300 kg/Day
NKJ - loads	Daily load	12 g/Day
	Daily load	1.560 kg/Day
NH4-N - loads	Daily load	910 kg/Day
NO3-N - loads	Daily load	60 kg/Day
Ntotale - loads	Daily load	1.620 kg/Day
P - loads	Specific load value	3 g/Day
	Daily load	390 kg/Day
Sewerage
Main sewer	Total length approx. 90 km - Diameter 300 - 1200 mm
Branch sewer (transportation sewer and collection sewer)	Total length approx. 90 km - Diameter 250 - 600 mm
Ventilation System Caverns
Air exchange	Preliminary treatment area	1 - 6 times
	Side galleries area	1 - 3 times
	Technical chambers area	1 - 15 times
	Maximum amount of air	approx. 150.000 m3/h
Sludge dryer
Capacity	Capacity evaporation	2,0 t/h
Thermal recycling plant
Capacity	Trought put	550 kg/h