Technical data Innichen - Sexten

Dimensioning of the plant:
Capacity:

36.000 inhabitants equivalent
each 25% population
50% from tourism
25% from industry
Loads: 1.500 kg BOD5/d
2.500 COD/d
225 kg Ntot/d
51 kg Ptot/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

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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:

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

Emergency screening plant:

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1 bar-screen; Bar spacing 3 mm

Screening plant:

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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:

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

Preliminary clarifier:

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

Biological basin:

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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 + VD + VN = 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:

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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:

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Simultaneous precipitation FE³ Chloridsulfat

Quantity of row sludge:

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

Pre-thickeners:

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

Secondary sludge pretreatment:

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screencloth, Conditioning by
Polyetectrolytes Q = 30 m³/h

Digestion chambers:

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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:

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

Gasometer:

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

Gas flare plant:

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Capacity = 15 m³/h

Gas compressor station:

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2 radial compressors

Sludge dewatering:

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

Sludge storage:

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Area: 220 m²
loaded by screw conveyor

Liquified gas installation:

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Tank V = 25 m³ (interrated) by evaporator station

Ventilation system:

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

Heating system plant:

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

Gas engine plant:

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1 pieces each
Ptot = 151 kW; Pel = 50 kW; Pth = 85 kW for propane and biogas

emergency power generator:

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

Deep well – industrial water:

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2 pieces of pumps, each 8 – 12 l/s