1. Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument) JURMALA, Sloka WWTP John Nurminen Foundation Tallinn 16.-17.3.2011 Dr.Sc. Ing. Romans Neilands Romans.Neilands@rtu.lv +371 26565048

2. Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument) Design figures Required outlet concentrations SS  35 mg/l COD  125 mg/l BOD 5  25 mg/l Total-N  15 mg/l Total-P  2 mg/l Dimensioning figures The dimensioning inlet flows are as follows: Design year2015 Connected population32 440 Daily average flow9000 m 3 /d Design flow, q dim 500 m 3 /h Max flow to pre-treatment1500 m 3 /h Max flow to main process750 m 3 /h The dimensioning inlet loadings are as follows: SS2320 kg/d256 mg/l COD4460 kg/d493 mg/l BOD 5 2140 kg/d236 mg/l Total-N480 kg/d53 mg/l Total-P80 kg/d9 mg/l

3. Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument) Results 2010-2011 March

4. Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument) POYRY. Technical audit of the Jurmala Wastewater treatment plant, 2010

5. Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument) 2011

6. Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument) Operation dificulties 1. Process stability during winter (temperature about 7°C); 2. Low hydraulic load (high HRT and SRT values); 3. Low loaded in terms of organic (low organic C source for nitrogen conversation); 4. Alcalinity control;

7. Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)

8. Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument) Inlet Q adjustment with Return sludge flow

9. Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument) Idea to make use of simple measurements, as those of pH, DO and ORP, not directly for the control, but to estimate the state of process Preliminary pH and ORP behaviours on anox&aerobic phaseThe first test structure pH and ORP signals on stoihiometric converasation Additional pH, ORP and DO measurements

10. Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument) Process

11. Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)

12. Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)

13. Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument) D.B. Clarifier, 2009

14. Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument) Process improvement POYRY. Technical audit of the Jurmala Wastewater treatment plant, 2010

15. Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument) POYRY. Technical audit of the Jurmala Wastewater treatment plant, 2010

16. Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument) POYRY. Technical audit of the Jurmala Wastewater treatment plant, 2010

17. Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument) Bioavailability?

18. Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument) Division of the total influent COD in municipal wastewater into its various constituent fractions. Bioavailability:

19. Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument) Bioavailability: Fractions of nitrogen in wastewater.

20. Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument) Bioavailability: Fractions of phosphorus in domestic wastewater.

21. Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument)

22. Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument) Proposals to improve nutrient control in WWTP efluent OBP- organic bound phosphorus EON-effluent organic nitrogen DON- dissolved organic nitrogen in effluent Proposals: 1. Wastewater effluent fractionation 2. Criteria for Stoichiometric nutrient limitation Research Bioavailability:

23. Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument) Thank you…!