Technical data Innichen - Sexten

Dimensioning of the plant:

Capacity:	40.000 inhabitants equivalent each 25% population 50% from tourism 25% from industry
Loads:	1.500 kg BOD₅/d 2.500 COD/d 225 kg N_tot/d 51 kg P_tot/d
Sewage flow:	Daily quantity of sewage 3.200 m³/d Dry weather flow 141 l/s Whet weather flow 256 l/s
Quantity of sludge:	row sludge: 182 m³/d 1.300 kg/d dried matter After primary sludge treatment: 30 m³/d After sludge dewatering: 5 m³/d
Total effective volume:	meccanical – biological treatment: 9.050 m³ Sludge treatment: 1.610 m³
total enclosed area:	30.000 m³

Technical data

Sewerage system

Catchment area:	160 km²
Lenght:	13,35 km
Diameter:	400 mm – 1000 mm
Material:	GFK, GU, Beton
Quantity manholes:	269
Quantity measuring station:	3
Quantity pump station:	1

Technical equipment

pump station:

2 screw conveyor, 800 mm,
Tilt angle 33°; Q_max 128 l/s

Emergency screening plant:

1 bar-screen; Bar spacing 3 mm

Screening plant:

2 bar-screen, 700 mm
Bar spacing: 5 mm; Qmax=936 m3/h by 1 screenings wash presses integrated and bagging decive

Aerated grit chamber:

2-line; each line
Grit chamber: Cross section 2,07 m²
Volume 67,2 m³; T = 9 min by Q_t
Grit washer Q_m= 12 l/s

Preliminary clarifier:

1-line,
Wide 6,0 m; Lenght 18,60 m
Water depht 2,35 m
V = 254 m³…….t = 0,49 h by Q_t
Longitudinal flowed, sludge scrapers

Biological basin:

2-line, each line
Aerob basin 1 basin = 620 m³
Anox basin (Denitrification)
2 basins = 880 m³
Aerob basin (Nitrification) = 1.325 m³
162 pieces membrane diffusers
Volume - Aerob basin 1.320 m³
Volume - Denitrification 1.760 m³
Volume - Nitrification 2.650 m³
Volume - Total A + V_D + V_N = 5.730 m³

6 Horizontal agitator Q = 16.990 m³/h
Recirculation pumps 2 x Q = 120 l/s
4 compressors, each: 300/720 Nm³/h, 9,5/19,3 kW

Final clarifier:

4 basins
Lenght/Wide = 37,0/6,0 m
Water depht 4,50 m; V = 4.160 m³
Longitudinal flowed, chain&flight scrapers

Phosphate Precipitation:

Simultaneous precipitation FE³ Chloridsulfat

Quantity of row sludge:

Row sludge 182 m³/d by 2.341 kg TS/d
and 41 m³/d after primary sludge pretreatment

Pre-thickeners:

1 pieces
diameter 7,00 m; Volume = 1x 234 m³
Rabble rakes, sludge water separation

Secondary sludge pretreatment:

screencloth, Conditioning by
Polyetectrolytes Q = 30 m³/h

Digestion chambers:

1 piece
Cylindrical tank D = 12,00 m; H =12,70 m
Usable volume = 1.140 m³;
digestion time 45 days
Circulation by biogas + pumps

Post thickeners:

1 piece
diameter 7,00 m; volume = 1x 234 m³
Rabble rakes

Gasometer:

Cylindrical enclosure in steel construction
Gas accumulator;
Usable volume 490 m³; H = rd. 8,0 m

Gas flare plant:

Capacity = 15 m³/h

Gas compressor station:

2 radial compressors

Sludge dewatering:

1 screw press, Conditioning by
Polyetectrolytes, Q = 3 – 5 m³/h

Sludge storage:

Area: 220 m²
loaded by screw conveyor

Liquified gas installation:

Tank V = 25 m³ (interrated) by evaporator station

Ventilation system:

Chemical area treatment scrubber
From meccanical and sludge treatment: 15.000 m³/h

Heating system plant:

2 boiler plants each 350 kW thermal capacity by switching automatically for methane gas or biogas

Gas engine plant:

1 pieces each
P_tot = 151 kW; P_el = 50 kW; P_th = 85 kW for propane and biogas

emergency power generator:

One emergency power generator
P_el = 185 kW for propane and biogas

Deep well – industrial water:

2 pieces of pumps, each 8 – 12 l/s