John Nurminen Foundation JURMALA, Sloka WWTP Tallinn 16.-17.3.2011

Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument) Dr.Sc. Ing. Romans Neilands [email protected]

+371 26565048

Design figures

Dimensioning figures

The dimensioning inlet flows are as follows: Design year 2015 Connected population 32 440 Daily average flow 9000 m 3 /d Design flow, q dim 500 m 3 /h Max flow to pre-treatment 1500 m 3 /h Max flow to main process 750 m 3 /h

Required outlet concentrations

SS  35 mg/l COD BOD 5 Total-N Total-P  125 mg/l  25 mg/l  15 mg/l  2 mg/l The dimensioning inlet loadings are as follows: SS COD BOD 5 Total-N Total-P 2320 kg/d 4460 kg/d 2140 kg/d 480 kg/d 80 kg/d 256 mg/l 493 mg/l 236 mg/l 53 mg/l 9 mg/l

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

Results 2010-2011 March

Parameter

Suspended solids COD BOD 5 Total nitrogen Total phosphorus

Demand

mg/l 35 125 25 15 2

HELCOM recommendations

mg/l - - % - - 15 15 0.5 80 70-80 90

Achieved (average 2010)

mg/l 4.1 45 % 99 82 6 14 0.42 98 74 94

Achieved (average 2011 Jan-March)

mg/l 3.8 48 % 99 80 7.3 23.2 0.39 97 71 95

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

T , N&P

20.0

18.0

16.0

14.0

12.0

10.0

8.0

6.0

4.0

2.0

0.0

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

Temperature C Ntot, mg/l Ptot, mg/l

2011

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;

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

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

400.0

350.0

300.0

250.0

200.0

150.0

100.0

50.0

0.0

3/ 8/ 20 11 0 0: 00 :0 0 1: 00 :0 0 2: 00 :0 0 3: 00 :0 0 4: 00 :0 0 5: 00 :0 0 6: 00 :0 0 7: 00 :0 0 8: 00 :0 0 9: 00 :0 0 10 :0 0: 00 11 :0 0: 00 12 :0 0: 00 13 :0 0: 00 14 :0 0: 00 15 :0 0: 00 16 :0 0: 00 17 :0 0: 00 18 :0 0: 00 19 :0 0: 00 20 :0 0: 00 21 :0 0: 00 22 :0 0: 00 23 :0 0: 00 FIQ01 FIQ03 FIQ04 FIQ06 FIQ07 FIQ09 FIQ08 FIQ02 Inlet Q adjustment with Return sludge flow

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

Additional pH, ORP and DO measurements

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 phase The first test structure pH and ORP signals on stoihiometric converasation

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

Process

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

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

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

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

D.B. Clarifier, 2009

Process improvement

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

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

Bioavailability ?

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

Bioavailability:

Division of the total influent COD in municipal wastewater into its various constituent fractions.

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

Fractions of nitrogen in wastewater.

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

Bioavailability:

Fractions of phosphorus in domestic wastewater.

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

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

Proposals to improve nutrient control in WWTP efluent

Research Bioavailability:

• 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

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

Thank you…!

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