Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument) JURMALA, Sloka WWTP John

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

JURMALA, Sloka WWTP

John Nurminen Foundation

Tallinn 16.-17.3.2011Dr.Sc. Ing. Romans [email protected]+371 26565048


Design figures

Required outlet concentrations

SS

35 mg/l

COD

125 mg/l

BOD5 25 mg/l

Total-N

15 mg/l

Total-P 2 mg/l

Dimensioning figures

The dimensioning inlet flows are as follows:

Design year 2015

Connected population 32 440

Daily average flow 9000 m3/d

Design flow, qdim 500 m3/h

Max flow to pre-treatment 1500 m3/h

Max flow to main process 750 m3/h

The dimensioning inlet loadings are as follows:

SS2320 kg/d 256 mg/l

COD4460 kg/d 493 mg/l

BOD5 2140 kg/d 236 mg/l

Total-N 480 kg/d53 mg/l

Total-P 80 kg/d9 mg/l


Results 2010-2011 March

Demand HELCOM recommendations

Achieved (average 2010)

Achieved (average 2011 Jan-March)

Parameter

mg/l mg/l % mg/l % mg/l % Suspended solids 35 - - 4.1 99 3.8 99 COD 125 - - 45 82 48 80 BOD5 25 15 80 6 98 7.3 97 Total nitrogen 15 15 70-80 14 74 23.2 71 Total phosphorus 2 0.5 90 0.42 94 0.39 95


POYRY. Technical audit of the Jurmala Wastewater treatment plant, 2010


T, N&P

0.0

2.0

4.0

6.0

8.0

10.0

12.0

14.0

16.0

18.0

20.0

ja

nvā

ris 2

00

9

fe

bru

āri

s 2

00

9

ma

rts 2

00

9

ap

rīlis 2

00

9

ma

ijs 2

00

9

jū

nijs 2

00

9

jū

lijs

20

09

au

gu

sts

20

09

se

pte

mb

ris 2

00

9

okto

bri

s 2

00

9

no

ve

mb

ris 2

00

9

de

ce

mb

ris 2

00

9

ja

nvā

ris 2

01

0

fe

bru

āri

s 2

01

0

ma

rts 2

01

0

ap

rīlis 2

01

0

ma

ijs 2

01

0

jū

nijs 2

01

0

jū

lijs

20

10

au

gu

sts

20

10

Date

mg

/l 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;



0.0

50.0

100.0

150.0

200.0

250.0

300.0

350.0

400.0

FIQ01

FIQ03

FIQ04

FIQ06

FIQ07

FIQ09

FIQ08

FIQ02

Inlet Q adjustment with Return sludge flow


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

Additional pH, ORP and DO measurements


Process




D.B. Clarifier, 2009


Process improvementPOYRY. Technical audit of the Jurmala Wastewater treatment plant, 2010






Bioavailability ?


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

Bioavailability:


Bioavailability:

Fractions of nitrogen in wastewater.


Bioavailability:

Fractions of phosphorus in domestic wastewater.



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:


Thank you…!

Documents

Part-financed by the European Union (European Regional Development Fund and European Neighborhood and Partnership Instrument) JURMALA, Sloka WWTP John