National Id
Slovenia_02
Summary
The innovative ecoremediation (ERM) system, which consist in a sedimentation pond for the deposition of coarse particles and reduction of current flow velocity, for treatment of the polluted tributary of Glinščica, Slovenia, was installed in 2006 by Limnos Itd.
Light or indepth?
Light
NUTS Code
Zahodna Slovenija
RBD code
SI_RBD_1
Transboundary
0
Data provider
REC
Source(s)
Case study: Ecoremediation System (ERM) for treatment of polluted tributary of Glinscica, Slovenia
Run-off treatment of highly fluctuating waters with subsurface vegetated drainage ditch and river bed with meanders
Vegetated ditches for treatment of surface water with highly fluctuating water regime
NWRM(s) implemented in the case study
Basins and ponds
Longitude
14.45249
Latitude
46.0761
Climate zone
cool temperate moist
Mean rainfall
1343
Mean rainfall unit
mm/year
Average temperature
9,69999980926514
Type
Case Study Info
Average slope range
0-1%
Vegetation class
Marsh vegetation
Monitoring impacts effects
1
Monitoring location
In-Stream
Monitoring parameters
Hydro-morphological, physical and chemical, in addition to water and sediments' toxicity, reed productivity and ERM system's plant diversity.
Monitoring upstream station
The water level was measured at Inflow and at additional 6 sampling points in the VDD.
Monitoring downstream station
Outflow of the VDD and the outflow of the RBM
Performance impact estimation method
Catchment outlet
Performance impact estimation information
pH, EC, DO and T were measured with portable meters WTW Multiline P4 according to Standard Methods. Hydraulic residence time (HRT) was measured with the tracer test with CaCl on 25.7.2007 and 26.7.2007. And statistical analyses.
Application scale
Field Scale
Installation date
2006-01
Performance timescale
< 1 year
Size
225
Size unit
m2
Inflow volume
260
Inflow volume unit
m3/day
Public consultation
1
Design contractual arrangement
Arrangement type Responsibility Role Comments Name
Design consultation activity
Activity stage Key issues Name Comments
Improved public acces
Design land use change
Land use change type
Design authority
Authority type Role Responsibility Name Comments
Limnos ltd.
Local water authority
Financing
MOL-Municipality of the Ljubljana
Key lessons
The research showed regularly maintained ERM system efficiently decreased pollutants in the tributary of Glinščica and that combination of vegetated ditch and meandered stream for this purpose is an adequate and promising technology that can be further developed.
Success factor(s)
Success factor type Success factor role Comments
Financing
Financing type Comments
Barrier
Barrier type Barrier role Comments
Driver
Driver type Driver role Comments
Financing share
Financing share type Share Comments
Policy description
Riparian development, pollution incident
Policy target
Target purpose
Runoff control
Pollutants Removal
Improved Biodiversity
Oher Societal Benefits
Policy pressure
Pressure directive Relevant pressure
Policy area
Policy area type Policy area focus Name Comments
Policy impact
Impact directive Relevant impact
Policy wider plan
Wider plan type Wider plan focus Name Comments
Policy requirement directive
Requirement directive Specification
Costs capital information
The cost was 100 Euro/m2 for investment
Costs operation maintenance
Operation is about 30-50 Euro/m2/year
Ecosystem impact climate regulation
Not relevant for the specific application
Information on retained water
118.7 m3
Ecosystem erosion control
0
Information on Ecosystem erosion control
Erosion increased
Water quality overall improvements
Positive impact-WQ improvement
Information on Water quality overall improvements
The results showed efficient removal of BOD5 (9%), organic N (24%), ammonia (7%), nitrites (84%), nitrates (68%), total N (40%) and total P (3%) in the entire ERM system in the third season. Vegetated ditch was efficient in removal of ammonia (38%), nitrites (91%) and nitrates (63%) and meandered stream was efficient in removal of total P (10%). With the exception of suspended and dissolved solids, pollutants concentrations at the end of the ERM system stayed within the permitted levels for outflow. The results showed the entire ERM system to be more efficient in removal of nitrites and ammonia in season 2008/2009 compared to previous year. Removal of sediments from the pond proved to be essential for efficiency of vegetated ditch, since the ditch reached higher efficiency for almost all parameters after maintenance work in the summer 2008
Water quality Improvements Phosphorus (P)
3
Water quality Improvements (P) unit
% reduction pf pollutant
Water quality Improvements Nitrogen (N)
40
Wq Improvements n unit
% reduction pf pollutant
Water quality Improvements (TSS)
SS increased
Soil quality overall soil improvements
Negative impact-SQ deterioration