Comparison of technology, costs and environmental benefit of wastewater treatment plants in mountainous areas in the alps

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Lamsenjoch Refuge

Site description and boundary conditions
Design and treatment efficiency

Site description and boundary conditions

boundary conditions
maximum daily organic load [PE]	200
maximum hydraulic load [m3/d]	15
annual organic load [kg BOD/a]	490
altitude [m a.s.l.]	1958
sensitivity [hydrogeology, protected area ...]	nature reserve, limestone
lagal requirements [BOD elimination]	80%
operation period [season]	summer
energy supply [type, kW]	aggregate
means of transport [type]	4WD
existing WWTP [type, condition, volume l/PE]	2-chambers, poor condition, 57

 

Fig. 4.29: 4 tanks made of prefabricated concrete parts at the backside of the Lamsenjoch Refuge.

Fig. 4.30: Time controlled floating sludge withdrawal operated by compressed air.

Fig. 4.31:   Flow-scheme of the WWTP Lamsenjoch Refuge

Design and treatment efficiency

Belastung Biologie

WWTP Lamsenjoch Refuge	saesonal average	max. week	max. day
loading [PE40]	60	128	200
BOD5-load [kg/d]	2.4	5.1	8.0
influent flow Q [m3/d]	4.3	10.5	15.0

 

Bemessung über die Schlammbelastung in max. Woche

V_aerob =  11.8 m³ (volume B-tank)

M_aerob = 11.8 m ³ x 3,0 kg SS/m³  = 35.4 kg SS (aerobic sludge mass)

B_SS = 5.1 kg BOD₅ /d / 35 kg SS = 0.14 kg/kg.d (aerobic sludge loading)

O_B = 5.1 x 3 kg O₂ /kg BOD₅ / 24 h = 0.63 kg O₂/h (oxygen demand)

 

Energy demand

max. power [W]	max. electric work [kWh/d]	mean electric work [kWh/d]
1.375	22	22

Reinigungsleistungen

date [dd.mm.yyyy]	CODeffluent [mg/l]	NH4-N effluent [mg/l]	NO3-N effluent [mg/l]	CODelimination [%]	Nelimination [%]	loadingg [% of PE max ]
01.09.1999	185	105	1.4	86	22
10.10.2001	60	154	0.0	98	20	36

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