Case Stories   

-  Reception facility: Ostrow Grabowski Waste Water Treatment Plant
-  Upgrading of Oily Wastewater Treatment Facilities in the port of Liepaja
Ostrow Grabowski Waste Water Treatment Plant, 
Reception Facility 
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Since 1992-1999 Carl Bro a|s has been involved in the environmental planning and the construction works of the Harbour of Szczecin in Poland, and planned projects will continue until the year 2004.

The Harbour areas consists of approx.500 ha industrial area comprising industries such as a large ship yard, a chemical plant producing pigments for paint, fish processing and chocolate factories, etc. In total approx. 4,000 workers are employed at the harbour.

The new facilities were planned and designed for extension in several building stages. These building stages consisted of sewage treatment facilities for the harbour area and an extension with special facilities for handling of ship-generated waste water according to MARPOL 73/78 Convention.

Consequently, the new plant is situated and planned in order to optimal consideration of both supply of waste water from the harbour area as well the supply by barges from sea.

Load basis
For the mechanical, biological and chemical treatment plant

Stage PE(60 g BOD/PE X d) Average Inlet
1 13,000 PE  3,200 m3/d
2 26,000 PE  6,400 m3/d
3 39,000 PE  9,350 m3/d

Reception facilities
 For oily waste water

Reception facilities Amount
Yearly  15,000 m3/ y
Daily average  60 m3/ d
Daily maximum  150 m3/ d

Reception facilities
For tank washings

Reception facilities Amount
Daily average  140 m3/ d

 

Port of Liepaja
Upgrading of Oily Wastewater Treatment Facilities

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Background

Liepaja is located on the West coast of Latvia and is the third largest city in Latvia. The port has existed on the site for many centuries. During the cold war Liepaja served as a Soviet navy base and it was the largest of its kind in the Baltic area next to St. Petersburg.

For a number of years Carl Bro has been involved as consulting company in environmental planning and construction work at the Port of Liepaja. The project has been divided into 2 phases. Phase 1 was a study of the status of reception and treatment facilities in Eastern Baltic ports. Phase 2 covers the "Port Waste Management Plan" for the Port of Liepaja, and the upgrading of the oily wastewater treatment plant in Liepaja is connected to phase 2.

The purpose of the project is to improve an existing low technological plant. 

The project is contributing to fulfil the Baltic Strategy developed by HELCOM. The Baltic Strategy for Port Reception Facilities for ship-generated waste should be seen as a package of different measurements to be implemented with the overall goal to substantially reduce the discharge from the ships into the Baltic Sea. Furthermore, the plant is part of the fulfilment of the environmental legislations in the EU.

The upgrade of the oily wastewater treatment facilities will be completed in 2003.


Description of the plant
The plant is designed to receive and treat 15,000 m3/year of oily wastewater collected from ships and different port installations.

The existing plant consists primarily of the following:

  • Simple reception facilities
  • Buffer tanks, settling tank, oil tanks and a sludge bassin
  • Chemical flocculation- and flotation unit
  • Filters
To improve the existing plant the following equipment is supplied and installed:
  • Reception facilities such as pumping station, inlet filters and flow meters
  • A new buffer tank for oil slop including oil skimmer
  • Various automation and measuring equipment
  • Complete CRS system for the existing plant and the new facilities
  • A truck for collection of oily wastewater around the port and other small ports in the area.
The plant will receive oily wastewater from both ships and trucks via a reception station at the quay. From the reception station the oily wastewater is pumped to the buffer tanks, where the more simple separation by gravity takes place. After the separation by gravity the water is purified via flocculation, flotation and filtration in other tanks. Finally, the cleaned water is led out to the sea.

The sediment will be sent to the municipal waste system and the oil will be used for district heating or steam production for the operation of the plant.

Operation
It has been the aim to design and construct a plant, which:
  • Has high reliability with a high level of safety
  • Is based on well-proven, high quality modern technology
  • Is energy-efficient, durable and has low life-cycle costs
  • Has minimum environmental impact during its construction and its operation
  • Provides good working conditions for its staff
  • Is fully automated and includes a computerized system for operation and supervision
Financing
The costs for realisation of the upgrading of the oily wastewater treatment facilities
will be approximately DKK 6 / EUR 0.83 million. The sources of financing were
grant from the Danish Environmental Protection Agency (DANCEE). 

Total costs for the plant including local financing will amount to DKK 15/EUR 2.1 million.