Project experts: D. Šarauskienė and D. Jakimavičius. Kaunas, LEI

Transcription

1 Project experts: D. Šarauskienė and D. Jakimavičius Kaunas, LEI

2 Content Results of chemical analysis of water samples Mixing zone modelling (low flow) Mixing zone modelling (maximum concentration case) Model application

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4 AA-EQS exceedances for HOTRISK project cases in Lithuania Hot spot Sampling point N T P T As Zn Hg Cr Cd Ni Pb Cu Bartuva at Skuodas Venta at Mažeikiai Agluona at N.Akmenė Dabikinė at Akmenė background * +* * -* discharger + + -* - +* -* -* - +** - end of mixing zone * * -* background * * - discharger - + -* - + -* - -* +* - end of mixing zone * * - background ** +* - discharger + + -* - +* -* -* - +* - end of mixing zone * - - +** +* - background * +* * - discharger + + -* - +* -* -* - +*** -* end of mixing zone * *** -* - * concentration under method detection limit (calculated); **exceedance only according to the new Directive 2013/39/EC *** exceedance according to the both EQS directives

5 µg/l N T background discharger end of MZ Bartuva at Skuodas Venta at Mažeikiai 230 Agluona at N.Akmenė Dabikinė at Akmenė

6 µg/l 7000 P T background discharger end of MZ Bartuva at Skuodas Venta at Mažeikiai Agluona at N.Akmenė Dabikinė at Akmenė

7 Input data for modeling Polluter River Input data of surface water Input data of discharge Low flow (Q 90 ), m 3 /s Depth, m Width, m Flow of discharge, m 3 /hr Skuodas Bartuva Mažeikiai Venta N.Akmenė Agluona Diameter of effluent pipe, m Akmenė Dabikinė

8 Comparison of the calculated CONCENTRATIONS of polluting substances at the end of MZ for the real measured discharge (Conc r and the low flow discharge (Conc Q90 ) values (μg/l) Hot spot Bartuva at Skuodas WTP Venta at Mažeikiai WTP Agluona at N.Akmenė WTP Dabikinė at Akmenė WTP Concentration N T P T As Zn Hg Cr Cd Ni Pb Cu Conc real Conc Q Diff Conc real Conc Q Diff Conc real Conc Q Diff Conc real Conc Q Diff The empty cells are for the chemical elements, the measured concentrations of which both in upstream and in the place of discharge were less than method detection limit

9 L EQS C B

10 Comparison of the LENGTHS of calculated mixing zones for total nitrogen for real measured discharge (1st case) and the low flow discharge (2nd case) values 1st number user defined zone calculated according to EQS criteria 2nd number - predefined zone: 10 x river width

11 Comparison of the LENGTHS of calculated mixing zones for total phosphorus for real measured discharge (1st case) and the low flow discharge (2nd case) values 1st number user defined zone calculated according to EQS criteria 2nd number - predefined zone: 10 x river width

12 Comparison of the CONCENTRATIONS of polluting substances in effluents (Conc real ) and the estimated maximum allowable concentrations (Conc max ) values(μg/l) Bartuva at Skuodas Venta at Mažeikiai Agluona at N.Akmenė Dabikinė at Akmenė Concentration Conc real Conc max N T P T As Zn Cr Cd Ni Pb Cu /28* /10* Diff /13* 76/8* 34 Conc real Conc max /12* Diff /5* 8 Conc real Conc max /-** Diff Conc real Conc max /6.05* /8.3* Diff /3* 10/1.1* 84 *the first number concentration according to AA-EQS of Directive 2008/105/EC and the second one - according to AA-EQS of Directive 2013/39/EC **according to Directive 2013/39/EC already the background concentration of Ni exceeds AA-EQS values

13 Real measured (Conc-real) and estimated maximum concentrations according to Directive 2008/105/EC (Conc_max_D2008) of cadmium in the discharged effluents 4 3 Cd Conc_real Conc_max_D Bartuva at Skuodas Venta at Mažeikiai Agluona at N.Akmenė Dabikinė at Akmenė

14 Real measured (Conc-real), estimated maximum concentrations according to Directive 2008/105/EC (Conc_max_D2008) and Directive 2013/39/EC (Conc_max_D2013) of lead in the discharged effluents Pb Conc_real Conc_max_D2008 Conc_max_D ,21 Bartuva at Skuodas Dabikinė at Akmenė

15 Estimated maximum concentrations according to Directive 2008/105/EC (Conc_max_D2008) and Directive 2013/39/EC (Conc_max_D2013) of nickel in the discharged effluents Ni Conc_real Conc_max_D2008 Conc_max_D ,2 2,5 3,5 1,8 Bartuva at Skuodas Venta at Mažeikiai Agluona at N.Akmenė Dabikinė at Akmenė

16 Real measured (Conc-real) and estimated maximum concentrations (the threshold value between good and moderate ecological quality class (Conc_max)) of total nitrogen in the discharged effluents μg/l N T Conc_real Conc_max Bartuva at Venta at Skuodas Mažeikiai Agluona at N.Akmenė Dabikinė at Akmenė

17 Real measured (Conc-real) and estimated maximum concentrations (the threshold value between good and moderate ecological quality class (Conc_max)) of total phosphorus in the discharged effluents μg/l P T Conc_real 8000 Conc_max Bartuva at Venta at Skuodas Mažeikiai Agluona at N.Akmenė Dabikinė at Akmenė

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19 The analysis of DBs of the State environmental monitoring of rivers, Operators' environmental monitoring, other performed scientific studies/projects, as well as the results of chemical analysis of water samples gathered during the expeditions revealed that in the rivers of Venta RBD there is no pollution by priority/hazardous substances. Whereas the problem of river water pollution by nutrients (total nitrogen and total phosphorus) was identified. The Discharge Test was calibrated and applied for the calculations of mixing zones in LT rivers of the Venta RBD. The modelling of the mixing zones was performed using worst-case approach (low flow conditions) for the real pollutant concentration measured during the expeditions. The further modelling was performed in order to find out what is a concentration limit of polluting substance in the effluent discharge for particular river mixing zone (in worst-case conditions).

20 The Discharge Test application and mixing zone designation is more important in cases of discharged effluents to the smaller rivers (the cases of the Agluona and the Dabikinė rivers), whereas in the larger rivers (the cases of the Venta and the Bartuva) the pollutant mixing process is more rapid and needs smaller mixing zone (according to EQS criteria) for dilution with receiving river water. The mixing zone approach using the Discharge Test could be useful to be applied in the rest of Lithuanian River Basin Districts, where more significant pollution by priority/hazardous substances is observed.

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