
The Domžale-Kamnik CČN capacity:
149.000 PE as per BOD5
Hydraulic load | |
Dry weather flow | 25.000 m3/day |
Rainy weather flow | 52,000 m3/day |
Detention time | approx 27 h |
CČN load | |
Biochemical oxygen demand (BOD5) | 8,940 kg BOD5/day |
Chemical oxygen demand (COD) | 17.880 kg KPK/dan |
Total nitrogen (TN) | 1,640 kg TN/day |
Permitted limit values at the outflow | |||
Parameter | Expressed as | Unit | Limit value |
BPK5 | O2 | mg/L | 20 |
COD | O2 | mg/L | 100 |
Ammonium nitrogen | N | mg/L | 10* |
Suspended solids | - | mg/L | 35 |
*valid for temperatures above 12°C |
Mechanical treatment | |
Annual amount of waste | 800 t |
Entry pumping station | |
Coarse rake screens | Screen spacing 20 mm |
Screw pumps | 4 x 170 L/s |
Fine rake screens | Screen spacing 3 mm |
Aerated grease and sand trap | |
Volume | 500 m3 |
Primary clarifier | |
Volume | 2000 m3 |
Biological treatment: Aeration basins | |
Aeration basin volume | 28.000 m3 |
Number of basins | 4 |
Capacity of a turbo blower | 6.500 Nm3/h |
Number of turbo blowers built in | 3 |
Return sludge pumping station | |
Return sludge pumps | 25 L/s |
Sludge treatment:
Digester | |
Number of digesters | 4 |
Total volume of digesters | 7.200 m3 |
Detention time | more than 25 days |
Mechanical sludge dewatering | |
Amount of sludge for thickening | 250 m3/day |
Centrifuge capacity | 60 m3/h |
Number of centrifuges | 1 |
Number of centrifuge operating hours | 1500 h/year |
Dry matter content in the final product | 32% |
Gasholder | |
Gasholder volume | 700 m3 |
Amount of biogase produced | 2.700 Nm3/day |
Biogas calorific value | 21.600 kJ/Nm3 |
Methane content in biogas | 60 – 64% |
Carbon dioxide content | 35 – 39% |
Other gases content | 1% |
Gas flare capacity | 200 Nm3/h |