AB „Klaipėdos vanduo“

Chief wastewater treatment engineer Kristina Bereišienė

Главный технолог обработки сточных вод Кристина Берейшене

Municipal hot spots – experience in elimination of

“hot spots”- requirements for objects

Основные сведенья о компании

AB “Klaipėdos vanduo”

• Established in August 2, 1902

• Authorized capital - 56,06 mln. Eur

• The number of employees – 392

• Number of water service plants – 55

• Number of wastewater treatment plants–

15

• Number of sewage pumping stations–107

• Supply drinking water for 90952

customers

• Основана 2 августа 1902 г.

• Уставной капитал – 56,06 млн. евро

• Число рабочих мест – 392

• Число водозаборов - 55

• Число очистительных сооружений

сточных вод - 15

• Число насосных ст. для стоков – 107

• Число абонентов, которым

предоставляется питьевая вода –

90952.

Water supply system

Система водоснабжения• 55 water service plants

2 in Klaipėda city;

53 - in Klaipėda district;

• 83 deep water boreholes

• 34 - third level pumping stations

• 858.2 km of operating water supply

networks

• Supplied water to networks-11.1 mln. m3

Sold water - 9.6 million m3

• 55 водозаборов

2 Клайпеде;

53- в Клайпедском районе

• 83 глубоководныx скважин

• 34 насосных станций третьего

подъема

• 858,2km сетей водоснабжения в

эксплуатации

• Поставлено воды в сети водоснабже-

ния – 11,1 млн. м3

• Объем проданной воды – 9,6 млн. м3

Wastewater treatment system

Система очистки стоков• 737,1 km of operating wastewater

networks;

• 107 sewage pumping stations;

• 15 wastewater treatment plants:

1 WWTP in Klaipeda;

14 small WWTPs in Klaipeda district.

• In 2017 were treated 17,93 mln. m3

wastewater:

16,92 mln. m3 - in Klaipeda WWTP;

1,00 mln. m3 - in small WWTPs of

Klaipeda district.

• Small wastewater treatment plants

located far from each other. Total

distance between all the small waste

treatment plants is about 300 km.

• 737,1 км сетей для сбора стоков (в

эксплуатации)

• 107 насосных станций сточных вод;

• 15 очистных сооружений:

1 oчистные сооружения г. Клайпеда;

14 маленьких очистных сооружений в

Клайпедском районе.

• В 2017г. было очищено 17,93 млн. м3

сточных вод:

16,92 млн. м3 - в ОС г. Клайпеда;

1,00 млн. м3- в маленьких ОС

Клайпедского района.

• маленькие очистные сооружения

расположенные далеко друг от друга.

Общая дистанция между всеми

маленькими oчистными сооруже-

ниями составляет около 300 км.

Klaipeda WWTP

Очистные сооружения г. Клайпеда

The primary mechanical wastewater treatment;

Biological wastewater treatment;

Sludge digestion;

Sludge dewatering;

Sludge drying;

Energy plant – biogas is used as a source of energy.

The location of small WWTPs in Klaipėda district

Drevernos WWTP (1964)

Veiviržėnų WWTP

Wastewater treatment processes supervision, control and data system (SCADA)

Basic facts about the Klaipeda WWTP 1998 start up into service of biological wastewater treatment

plant;

The designed biological wastewater treatment plant capacity isup to 29,2 million m3 per year (80 000 m3 per day);

In 2008 was installed chemical phosphorus treatment;

In 2009 was built sludge digestion plant (investment 12,16 mln.euro);

In 2013 was built a sludge drying facility (investment 6,66 mln.euro);

2016 started landfilling biogas utilistion. In average 100 000m3/month.

Wastewater treatment effect up to 98%;

Wastewater treatment plant employs 19 people staff.

Primary mechanical wastewater treatment

Первичная механическая очистка сточных вод

• Sewage inlet chamber Qavg=45000m3/day

(Project Q = 80000 m3/day)

• Automatic perforated HUBER EscaMax®

screens - 3 pcs.

• HUBER ROTAMAT® Screenings Wash

Press WAP/SL

• HUBER sand washer RoSF 4

• Sand grit - 2 sections

• The primary settling tank -3pcs. (Ø 48 m).

• Gravity sludge thickeners - 3pcs.

• The amount of screenings transporting to the

landfill - 18t/month.

• The amount of sand transporting to the

landfill - 12t/month.

Biological wastewater treatment

Биологическая очистка сточных вод• UCT (Кейптаунский университет)

технологическая схема;

• Аэротенки разделены на 4 независимые

секции;

• Концентрация активного ила 4-4,5 мг/л;

• Концентрация растворенного кислорода

1,8-2,5 мг O2/л;

• Для улучшения очистки общего азота

используется органическая добавка

POLIFLOCK MT 12 ECO;

• Очищенные сточные воды поступают в

спускной канал и впадает в Куршский

залив;

• Очищенная сточная вода используется в

качестве технической воды в процессе

сушки ила;

• Химическая очистка фосфора из-за

хороших общих показателей очистки

фосфора не используется.

• UCT (Cape Town University)

technological scheme;

• Aerotanks divided into 4 independent

sections;

• Active sludge concentration 4-4.5 mg/l;

• Dissolved Oxygen Concentration 1.8-2.5

mg O2/l;

• For better cleaning of total nitrogen is

used the organic additive POLIFLOCK

MT 12 ECO;

• The treated wastewater enters to the

channel and enters to the Curonian

Lagoon;

• Treated waste waters also are used as a

technical water in sludge drying process.

• Chemical cleaning of phosphorus due to

the good general phosphorus cleaning

parameters is not used.

Wastewater treatment requirements and

operation results in 2017

Требования очищенным сточным водам

Parameter

Before

treatment,

mg/l

After

treatment,

mg/l

Effluentpermitlimit

values, mg/l

Designedeffluent,

mg/l

Suspended matter (SM) 399,76 6,59 - 15,0

Biochemical Oxygen Demand

(BOD7)388,20 6,22 15,0 20,0

Total nitrogen (N) 88,35 9,95 10,0 15,0

Total phosphorus (P) 10,30 0,426 1,0 1,5

Small WWTP in

Klaipeda district

ParameterBefore

treatment,

mg/l

After

treatment,

mg/l

Effluent permit limit values, mg/l

MAC mom., mg/l Maximum annual average

concentration, mg/l

1(b) Vėžaičių NV

Biochemical Oxygen Demand (BOD7)249,914 3,714 12 12

Total phosphorus (P) 8,78 1,741 2

Total nitrogen (N) 82,973 13,292 36

2(b) Lapių NV Biochemical Oxygen Demand (BOD7)137,951 9,048 34 23

3(b) Veiviržėnų NV Biochemical Oxygen Demand (BOD7)82,171 6,889 34 23

4(b) Judrėnų NV Biochemical Oxygen Demand (BOD7) 206,35 12,373 34 23

5(b) Drevernos NV Biochemical Oxygen Demand (BOD7)86,7 10,243 34 23

6(b) Kalnuvėnų NV Biochemical Oxygen Demand (BOD7)169,492 15,25 34 23

7(b) Endriejavo NV Biochemical Oxygen Demand (BOD7)352,631 4,677 34 23

8(b) Žadeikių NV Biochemical Oxygen Demand (BOD7)24,333 7,757 34 23

9(b) Kretingalės NVBiochemical Oxygen Demand (BOD7)

378,007 20,669 34 23

Fats 0,179 20 10

10(b) Plikių NVBiochemical Oxygen Demand (BOD7)

80,084 5,37 17 12

Total phosphorus (P) 2,047 2,09

11(b) Girkalių NV

Biochemical Oxygen Demand (BOD7)318,429 16,717 17 12

Total phosphorus (P) 2,235 2

Total nitrogen (N) 17,813 20

12(b) Kvietinių NV Biochemical Oxygen Demand (BOD7)219,948 6,539 34 23

13(b) Dauparų NV Biochemical Oxygen Demand (BOD7)354,959 8,426 34 23

14(b) Šiūparių NV Biochemical Oxygen Demand (BOD7)388,013 11,715 34 23

Requirements for treated wastewater

Требования очищенным сточным водам

The amount of treated wastewater (in million m3 /y) for 1995-2015

Количество очищенных сточных вод (в млн. м3/год) за 1995-2015

0

5

10

15

20

25

30

1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017

mln. m3

Biochemical Oxygen Demand (BOD7) concentrations in 1995-2017

Концентрация биохимического кислорода (BOD7) в 1995-2017г.

0

50

100

150

200

250

300

350

400

450

500

1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017

Co

nc

en

tra

tio

n m

g/l

before treatment after treatment

The concentration of total nitrogen in 1995 - 2017

Концентрация общего азота в 1995-2017г.

0

10

20

30

40

50

60

70

80

90

100

1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017

Co

nc

en

tra

tio

n m

g/l

before treatment after treatment

Total phosphorus concentrations in 1995 - 2017

Общие концентрации фосфора в 1995 - 2017 г.

0

2

4

6

8

10

12

14

1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017

Co

nc

en

tra

tio

n m

g/l

before treatment after treatment

Sludge management and energy plant

Energy plantThe produced biogas is using for energy in the central combined heat

and power plant. The power plant is equipped with 3 biogas generators (eachgenerator electric power 311 kWel). A biogas powered engine energyconverting into electricity and thermal energy. Electrical energy is used forown needs. Currently generators producing for almost 70% of the wastewatertreatment plant required electric power. Thermal energy is used for digestersand biological biogas cleaning. Sludge drying using spare heat from this 3generator, and from installed an additional 600 kWel power generator, whichis using landfill or natural gas.

Total produced amount of biogas 2016 m. - 2,216 mln. m3/metus(6071,6m3/d)

The total produced amount of electricity 2016 m. –4460,136MWh/metus (12219,55 kWh/d)

Total produced amount of heat (designed) –6456 MWh/a

Sludge drying plantIn 2013 was built a sludge drying plant, which is available to dry

up to 18,000 t/a of dewatered sludge. This low-temperature belt

dryer (manufacturer Sülzle Klein GmbH) with a capacity of 4,800

t/a of dried sludge (90 % SM).

The dewatered sludge from centrifuges (also sludge from other

treatment plants) comes to 400 m3 volume bunker. From bunker

sludge are pumping to distributors. The distributor evenly spreading

sludge on top of the dryer belt. In the dryer sludge is transporting

through a drying zone at 80-90°C where the heated air removes

moisture;

Dried sludge are crushing and transporting in to the silo (150m3),

where are storing until unloading;

During drying process, outgoing air is cleaning in scrubber,

afterward in biofilter and discharging into the environment.

Sludge drying plant

The sludge volume reduction

Liquid sludge 1000 kg; 4% SM

Mechanically dewatered sludge 44 kg; 25% SM

Dried sludge 44 kg; >90% SM