Case study:ECOREMEDIATION SYSTEM (ERM) FOR TREATMENT OF POLLUTED TRIBUTARY OF GLINŠČICA

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Location: 46° 4' 34", 14° 27' 9"
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Project overview

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Status Complete
Project web site
Themes
Country Slovenia
Main contact forename Tjasa
Main contact surname Griessler Bulc
Main contact user ID
Contact organisation Limnos d.o.o.
Contact organisation web site
Partner organisations
Parent multi-site project
This is a parent project
encompassing the following
projects
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Ecoremediation (ERM) system for treatment of the polluted tributary of Glinščica (Photo: S. Blumauer)

Project summary

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Water analyses have shown increased toxicity and pollution loads of the stream Glinščica. The innovative ecoremediation (ERM) system for treatment of the polluted tributary of Glinščica was therefore installed in 2006 and its performance has been monitored since then. The ERM system consists of the sedimentation pond for the deposition of coarse particles and reduction of current flow velocity; the vegetated ditch filled with different mixtures of sand, planted with common reed (Phragmites australis) for the aerobic – anaerobic treatment and meandered, revitalized stream bed of the tributary for the additional treatment. Hydro-morphological, physical and chemical parameters of the polluted tributary were monitored in season 2008/2009 (from April 08 until April 09), in addition to water and sediments' toxicity, reed productivity and ERM system's plant diversity. The results were compared with the results from first (2006/2007) and second (2007/2008) season and the efficiency of pollutants removal in the older ERM system was evaluated with respect to the initial state. The contribution of each part of the system to the efficiency of water cleaning and the contribution of the entire ERM system to the higher area's biodiversity were evaluated. 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. 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 (Blumauer, 2010).

Creation of new sedimentation pond and creation of 70m long ecoremediation system for water treatment.

Monitoring surveys and results

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Lessons learnt

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Image gallery


Glinščica tributary (on the left) and treatment ditch (on the right) with a new river bed with meanders (Vzdrževanje …, 2009).
Meandered stream (Photo: S. Blumauer)
Ortophoto of ecoremediation system location (in red) (Photo: Geopedia).
The vegetated drainage ditches with marked sampling points. 1-inflow, 2-outflow from the treatment ditch, 3-outflow from meandered stream (Griessler Bulc and Šajn Slak, 2007).
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Catchment and subcatchment

Catchment

River basin district Danube
River basin Sava River

Subcatchment

River name Glinščica
Area category Less than 10 km²
Area (km2)
Maximum altitude category 200 - 500 m
Maximum altitude (m)
Dominant geology Calcareous
Ecoregion Dinaric Western Balkan
Dominant land cover Urban, Extensive agriculture, Woodland
Waterbody ID



Site

Name Podutik
WFD water body codes SI14VT93
WFD (national) typology catchment area of MPVT Mestna Ljubljanica
WFD water body name MPVT Mestna Ljubljanica
Pre-project morphology Single channel, Straight
Reference morphology
Desired post project morphology
Heavily modified water body Yes
National/international site designation
Local/regional site designations municipal area of wise protection
Protected species present No
Invasive species present No
Species of interest
Dominant hydrology Artificially regulated, Quick run-off, Groundwater
Dominant substrate Sand, Gravel, Silt
River corridor land use Urban, Extensive agriculture, Wetland, Woodland
Average bankfull channel width category Less than 2 m
Average bankfull channel width (m)
Average bankfull channel depth category Less than 0.5 m
Average bankfull channel depth (m)
Mean discharge category
Mean annual discharge (m3/s)
Average channel gradient category
Average channel gradient 0.006
Average unit stream power (W/m2)


Project background

Reach length directly affected (m)
Project started 2005/01/01
Works started 2006/01/01
Works completed 2006/01/01
Project completed
Total cost category
Total cost (k€)
Benefit to cost ratio
Funding sources MOL-Municipality of the Ljubljana

Cost for project phases

Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname
Investigation and design Limnos ltd. Tjasa Griessler Bulc
Stakeholder engagement and communication Limnos ltd. Tjasa Griessler Bulc
Works and works supervision Limnos ltd.
Post-project management and maintenance
Monitoring Limnos ltd.



Reasons for river restoration

Mitigation of a pressure Riparian development, Pollution incident
Hydromorphology Quantity & dynamics of flow, Substrate conditions
Biology Macrophytes: Average abundance, Macrophytes: Taxonomic composition
Physico-chemical Nutrient concentrations, pH, Salinity, Oxygen balance, Temperature, Specific synthetic pollutants, Specific non-synthetic pollutants
Other reasons for the project


Measures

Structural measures
Bank/bed modifications New outflow and inflow from ecoremediation system, Smaller retention of the water and conversion into new channel
Floodplain / River corridor Creation of pond, Creation of new vegetated drainage ditches, Water treatment methods
Planform / Channel pattern Creation of meanders
Other
Non-structural measures
Management interventions maintenance of ERM system
Social measures (incl. engagement) Improved public access
Other Information board erected


Monitoring

Hydromorphological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative
Quantity & dynamics of flow Yes Yes Yes Deterioration
Substrate conditions Yes Deterioration

Biological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative
Macrophytes & phytobenthos: Average abundance Yes Yes Yes Inconclusive
Macrophytes & phytobenthos: Taxonomic composition Yes Inconclusive

Physico-chemical quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative
Nutrient concentrations Yes Yes Improvement
pH Yes Yes Improvement
Salinity Yes Yes Improvement
Oxygen balance Yes Yes Improvement
Temperature Yes Yes Improvement
Specific synthetic pollutants Yes Yes Improvement
Specific non-synthetic pollutants Yes Yes Improvement

Any other monitoring, e.g. social, economic

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative


Monitoring documents



Additional documents and videos


Additional links and references

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Supplementary Information

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REFERENCES

Blumauer S. Primerjava začetnega in večletnega delovanja ekoremediacijskega objekta (ERM) za čiščenje onesnaženega dotoka Glinščice : diplomsko delo : univerzitetni študij = Comparison between the initial and longterm performance of the ecoremediation system (ERM) for treatment of polluted tributary of Glinščica : graduation thesis : university studies. 2010, Ljubljana, 89 p.

Griessler Bulc T. and Šajn-Slak A. (2007). Agricultural run-off treatment with vegetated drainage ditches. In: Proceedings of the International Conference on Multi Functions of Wetland Systems. Borin M., Bacelle S. (Eds.). Legnaro (Pd), Padova, 86-87.

Vzdrževanje in spremljanje učinkovitosti ekoremediacijskega objekta na Glinščici. Končno poročilo. 2009. Ljubljana, Limnos d.o.o.: 50 p.