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Latvia, Sv演ciems Latvia, Sv演ciems The Pilot Site – Sv演ciems Village is located in Northern part of Latvia next to the Highway Riga–Tallinn. Approximately in 1 km distance from the Gulf of Riga. The population of Sv演ciems is 473 inhabitants (2006). Area is located within North Vidzeme Biosphere Reserve. The construction of pilot object was funded by the Interreg Baltic Sea Region Programme 2014-2020 and Salacgr鴳a District Municipality Latvia, Sv演ciems

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Latvia, Sv演ciems

The Pilot Site – Sv演ciems Village is located in Northern part of Latvia next to the Highway Riga–Tallinn. Approximately in 1 km distance from the Gulf of Riga. The population of Sv演ciems is 473 inhabitants (2006). Area is located within North Vidzeme Biosphere Reserve.

Latvia, Sv演ciems

Historical background of Pilot site

First historical records about Sv演ciems are dated 1638, when a manor of Sv演ciems is mentioned. Settlement is located on the banks of salmonid river Sv演upe, which in Latvian means Holy River. This hydronym derives from Holy caves of Sv演upe, located approximately 15 km upstream of village. Nowadays settlement exists mainly as a supportive satellite of Salacgr鴳a town and harbor which is located 6 km northwards.

Latvia, Sv演ciems

Quality of recipient water
River Sv演upe is located in the protected site – North Vidzeme Biosphere Reserve, and is designated as Salmonid River. Therefore the more strict requirements for treatment of sewerage water are defined by environmetal authority.

Characteristics of water supply and wastewater treatment services provided

    Water supply

Sewerage

Total length of water supply network, km

3,9

3,2

Total length of sewerage network, km

Inhabitants connected to water supply network

389

343 (*)

Inhabitants connected to sewerage collection network

Extracted groundwater, m3/ year

12 956

12 665 (2011)

7320 (2015)

Total amount of wastewater treated in WWTP, mэ  /year

 

Latvia, Sv演ciems

Existing wastewater treatment solution

Collected wastewater are treated by using biological treatment technology and is characterized as follows:

 

Year of Construction

1986

WWT Technology and Projected capacity; m3/day

BIO – 100x2:  Standard Project with 2 industrially produced aero-tanks with capacity of each – 100 m³ per day

Sewerage  disposal

Treated wastewaters from aero-tank are discharged to surface water body through 4 biological ponds having function of surface flow constructed wetland. Thus additional nutrient purification is performed. After passing ponds treated waters enters River Sv演upe.

Requirements for recipient water body

Recipient water body – Sv演upe – is productive salmonid migration and spawning ground with status of salmonid waters. Therefore additional treatment of wastewater is required.

  

 

Wastewater treatment technology of existing WWTP

Latvia, Sv演ciems
Latvia, Sv演ciems

Problems to be solved
• The projected capacity are too large for currently produced wastewater loads. Therefore only one aero-tank is operated;
• Since WWTP was designed for bigger capacity and partial load was not expected for a long time, air blower power consumption is much more, then necessary;

Latvia, Sv演ciems

• Existing concrete housing of WWTP is leaking, making secondary soil pollution;
• The wastewater treatment requirements set by the Regional environmental authority are reached not because of efficient treatment within aero-tank, but because of additional purification carried out in ponds having function of surface flow constructed wetland, which is not isolated from soil.

Effectivity characteristics of existing WWTP

 

Parameter

Requirements set by

Inflow (*)

Outflow

national legislation

regional environmental authority

27.06.2012

14.03.2012

27.06.2012

19.09.2012

15.02.2017

Suspended solids

< 35,0

< 35,0

60

1,7

2,4

6,3

2,0

BOD

< 25,0

< 25,0

72

0,7

3,1

6.2

8,0

COD

< 125,0

< 125,0

185

26

28

52

35,0

P tot

No limits

No limits

-

0,71

1,68

3,59

2,9

N tot

No limits

No limits

-

8,9

7,1

4,76

34,0

Latvia, Sv演ciems

Proposed solution
• Reconstruct biological WWTP with activated sludge, as cost effective and environmental more friendly solution the construction of new WWTP with appropriate capacity is designed on the land parcel of the old one;

Latvia, Sv演ciems

• Since WWTP discharge is directed into Sv演upe, which is salmonid water, additional phosphorous and total nitrogen treatment is advised, the technology is under design right now. The following alternatives are evaluated:

o Coagulant dosing to WWTP;

o Reconstruction of polishing pounds to wetlands;

o Cleaning of polishing pounds.

 

Technology for improved wastewater treatment

Latvia, Sv演ciems
Latvia, Sv演ciems

Expected effects
• Decreasing of power consumption;
• Significant decreasing of CO2 emission since WWTP automation, which will avoid everyday operator visits to check equipment status;
• Elimination of soil pollution due to leakages in WWTP and due to untreated wastewater inflow to non-isolated polishing pounds;
• Elimination of additional pollution of

Sv演upe river salmonid waters

Current state of the pilot
The renovation of the outdated WWT facilities was initiated by Salacgr鴳a Municipality and evaluation of technical condition was done by University of Latvia, including sampling and analyses of influent and effluent wastewater and preparation of Feasibility Study. Project partners have been contacted to discuss best available technical solutions and Pilot sites in Lithuania and Poland was visited to select best technology for additional nutrients removal. Construction of new WWT facilities will be conducted in February-March 2018 and should be fully installed to start operate in April-May 2018.

Latvia, Sv演ciems

What happens in the pilot
The impact of Sv演ciems WWT plant was assessed by taking samples starting from September 2016.

Latvia, Sv演ciems

The pilot site were visited to evaluate condition and efficiency of existing WWT plant

Latvia, Sv演ciems

Water utility “Salacgr鴳as dens” were interviewed to identify existing problems.

Latvia, Sv演ciems

Project Partners have been contacted to discuss best available technical solutions and Pilot sites in Lithuania and Poland was visited to select best technology for additional nutrients removal.

Latvia, Sv演ciems

Due to the long technical design and wastewater treatment technology approval process with Reginal Environmental Board the construction of new wastewater treatment facility was started in late 2018.

Latvia, Sv演ciems

During the building process pilot site was inspected by responsible state environmental authority.

Latvia, Sv演ciems

The collected data clearly demonstrate environmental improvements of new wastewater treatment facility – the use of electricity has reduced significantly. Electricity consumption before (blue) and after (brown) introduction of improved wastewater treatment. 

Latvia, Sv演ciems

The construction of pilot object was funded by the Interreg Baltic Sea Region Programme 2014-2020 and Salacgr鴳a District Municipality.    

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Latvia, Sv演ciems

Latvia, Sv演ciems

Historical background of Pilot site First historical records about Sv演ciems are dated 1638, when a manor of Sv演ciems is mentioned Settlement is located on the banks of salmonid river Sv演upe, which in Latvian means Holy River The Pilot Site – Sv演ciems Village is located in Northern part of Latvia next to the Highway Riga–Tallinn. Approximately in 1 km distance from the Gulf of Riga. The population of Sv演ciems is 473 inhabitants (2006). Area is located within North Vidzeme Biosphere Reserve.

Latvia, Sv演ciems

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