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Progress December 2012: Final Conference, Turku site visits and finalization of project activities

PURE Final Conference took place 16-18 October 2012 in Gdansk, Poland, concluding the achievements of the project and also marking the nearing end of its implementation period. It has gathered around 150 representatives of different stakeholders who convened to share project results, and consider how its valuable lessons could be used in other cities across the Baltic Sea catchment area. You can learn more about Final Conference here.

PURE group visiting Biovakka biogas plant. Photo: UBC.
PURE group visiting Biovakka biogas plant. Photo: UBC.
On 11 December, the last site visit enabled PURE partners to learn about waste water treatment and biogas production in Turku. Kakola WWTP allows more efficient effluent treatment, due to which the discharge to the sea is reduced by 30-50 %, and the heat energy of the sewage water is transferred into district heating energy (18 MW) and district cooling energy (35 MW) in a special thermal pump. Biovakka plant on Turku landfill, in turn, processes wastewater treatment sludge into biogas, later used as an environmentally friendly source of heat and electricity.

On the next day, 12 December 2012, gathered project consortium has adopted the common statement on the next steps of PURE partners in promotion of the advanced phosphorus removal and sustainable sludge management in the Baltic Sea region. The goal is to succeed in fulfilling HELCOM recommendations on wastewater treatment and contribute to the implementation of the HELCOM Baltic Sea Action Plan (BSAP).

The investment processes were successfully finalized at the waste water treatment plants of Riga and Jurmala. In Riga, the phosphorus removal equipment - two electromagnetic flow meters and ferrous sulphate dosing container were put into operation already in May 2012. The centrifuge to improve sludge dewatering capacity was delivered and installed in early autumn 2012. In Jurmala new PURE financed air flow meters and pressure sensor were supplied on 1 August and installed in November 2012. The polymer unit for improved sludge treatment was supplied and installed in August-September; it had been tested during mid-December 2012. Lowering the walls between anoxic and aerobic zones was completed in October 2012.

All PURE partner WWTPs have timely ended their project activities by 16 December 2012, with the exception of Brestvodokanal. In Brest, an additional project implementation time was granted to finalize realization of the investments. Currently, construction works of the chemical storing and dosing station in the plant are expected to be completed by the early spring 2013. The purchase, delivery and installation of the chemical dosing and laboratory equipment are expected to be in progress during January-June 2013.

Progress June 2012: Investments proceeding, visit to St. Petersburg Vodokanal

Head of Riga WWTP, Maris Zviedris is showing the PURE financed chemical dosing tank.
Head of Riga WWTP, Maris Zviedris is showing the PURE financed chemical dosing tank.
In Riga the tendering for centrifuge to improve sludge dewatering capacity had to be redone due to supplier’s inability to deliver the equipment. Contract regarding the delivery of needed centrifuge has been signed with another supplier and delivery and installations will be completed during summer 2012. Installation of two new flow meters on the two incoming pressure mains has started and work is finalized in May 2012. Installations of ferric sulphate dosing tank will start during the summer.

In Brest construction works of the chemical storing and dosing station in the plant were launched in April 2012 and a tender for chemical dosing and laboratory equipment delivery and installation services will be launched in June 2012. In Brest there are plans for a major renovation and expansion project in the near future, and the PURE investment is the most cost-effective one to fastly cut down the phosphorus loading with the limited funding within the project.

Jurmala WWTP basin that will undergo wall adjustments. Outside the tank wall the new measurement equipment is also visible.
Jurmala WWTP basin that will undergo wall adjustments. Outside the tank wall the new measurement equipment is also visible.
At Jurmala new PURE financed measurement equipment to improve the process control and balancing have been delivered and installed in May 2012. During May and June the equipment will be calibrated and tested. Design of lowering the walls between anoxic and aerobic zones will be finalized in June 2012 and adjustments will be done in July 2012. This will enable surface sludge to be transported to the aerobic basin, where it may be disintegrated by aeration.

In Gdansk, Kohtla-Järve and Szczecin operational improvements have been proposed to enhance the nutrient removal efficiency. Gdansk and Kohtla-Järve treatment plants are and will be going through major renovations to improve the waste water treatment efficiency. These major works were not foreseen in project PURE. In Szczecin, different kinds of measures to improve the operation of the plants are being planned and tested, including some of the PURE consultants proposals.

During 15-16 May 2012 PURE partners visited St. Petersburg Vodokanal; the Water Museum, and Central and Southwestern waste water treatment plants. Vodokanal is an Associated Partner of PURE. Read more from the News!

New dosing tank in Riga examined by project coordinator Hannamaria and controller Sanna from UBC. Photos: PURE/Hannamaria Yliruusi.
New dosing tank in Riga examined by project coordinator Hannamaria and controller Sanna from UBC. Photos: PURE/Hannamaria Yliruusi.

February 2012: Publication on good practices, decision making training, investments...

Two background draft reports for the Book of Good Practices on sustainable sludge management in municipal WWTPs are now ready. The draft report on technology options has been sent to PURE partners for commenting in February. To include practical cases in the publication a questionnaire drafted by PURE partner EBHL Lübeck together with the Project Steering Group (UBC, HELCOM and JNF) was sent to the partners to describe their sludge management details.

PURE partner city of Gdansk and water company GiWK are already making preparations for the Final Conference to be held in Gdansk, 16-18 October 2012. Mariehamn town is finalizing the PURE Database with the Project Steering Group.

Training sessions on Analytical Hierarchy Process (AHP) took place in Kirkkonummi, Finland on 9-10 February. It was organized by WP5 leader, John Nurminen Foundation and conducted by the experts from consulting organization Pöyry. Aim of the event was to equip the participants from partner WWTPs of Riga, Jurmala, Szczecin, and Lübeck with practical skills in structuring and analyzing complex decisions, and make possible to hold similar AHP sessions on a wide variety of decision situations in the future. Different sludge handling alternatives were used as practical examples in the AHP session.

Of the investing PURE partners Jurmala’s installations of new equipment will take place during the spring. Also preparations for the modification of the division walls in the biological nutrient removal process will be done to improve the process controllability. In Riga the new centrifuge has been tendered again because of the previous supplier’s problems in delivering. The other installations in Riga should be ready by April. In Brest the tendering for construction works closed in the beginning of February, and tendering of the equipment is under preparation.

ZWiK Szczecin doesn’t implement investments in PURE, but is improving the sludge dewatering process in both Pomorzany and Zdroje WWTPs by e.g. adjusting the precipitant dosing. Also some activities are underway for e.g. using the nitrogen rich reject waters from sludge dewatering to improve the nitrification process.


September 2011: Municipal wastewater sludge management in focus

Host of the event, Enno Thyen from Lübeck is welcoming the participants on 7 September 2011. Photo: Entsorgungsbetriebe Lübeck
Host of the event, Enno Thyen from Lübeck is welcoming the participants on 7 September 2011. Photo: Entsorgungsbetriebe Lübeck
PURE project workshop on Sustainable Sludge Handling was organized in Lübeck on 7-8 of September 2011. The event gathered 70 experts from around the Baltic Sea region, e.g. PURE partner organizations, associated partners, water companies, universities and consultants. This demonstrates the importance of environmentally sustainable, economically efficient and legally allowed sludge management – essential part of modern wastewater treatment.

Both political and economical aspects affecting the sludge management strategies, as well as practical technical solutions and future prospects in different circumstances were presented and discussed. Differing legislation, risk assessment, energy policies and nutrient recycling possibilities have a big impact in planning of the future sludge management options which may require major economical investments. See more details from the Sustainable Sludge Handling Workshop and the presentations.

PURE is preparing sludge related publications. In November 2011 an electronic Newsletter will be published, concentrating on practical experiences of sludge handling. One of the main outputs of PURE is a publication of good practices in sludge management including legislation, various technological solutions for sludge stabilization, dewatering, drying, hygienization and disposal, and also some experiences. This publication is in drafting phase.

March 2011: Investments for enhanced phosphorus removal in progress

Tendering for the equipment Riga Daugavgriva WWTP has been completed. Two electromagnetic flow meters and a ferric sulphate dosing tank have been delivered by the end of 2010 and are waiting for installation. The delivery of the centrifuge for improved excess sludge management is going to take place in spring 2011.

Local adaptation of the detailed plans for Brest investment is under way. Jurmala Water has performed and will perform additional testing at Sloka WWTP to refine the proposed investment. Tendering for the equipment will begin in Jurmala in spring 2011.

PURE was one of the organizers of the “Local Actors as Forerunners – Concrete Achievements and Links to International Covenants in Baltic Sea Protection” in Tallinn on 16 March. The event gathered c. 100 participants representing municipalities and city organizations, water companies, ministries, international financiers and universities from the Baltic Sea region. Local achievements and problems in the Baltic Sea protection work were presented and discussed. See the programme of the event and presentations of the speakers. Also a project meeting of PURE was organized in Tallinn on 16-17 March

December 2010: Riga investment in progress, investment plans for Brest and Jurmala

Pilot investment at Riga Daugavgriva WWTP is in progress and it is expected that installations will be ready in couple of months. Implementation of this investment, Riga WWTP will reduce the phosphorus load to the Gulf of Riga by c. 100 tons annually.

Detailed plans for Brest and Jurmala investments are ready, as well as audit reports for Gdansk, Kohtla-Järve and Szczecin WWTPs. In Brest PURE-financed chemical storing and dosing station will be built in unused pre-aeration basins. Also new on-line and laboratory analysis equipment of phosphate and total phosphorus will be purchased to optimize the treatment process. At Jurmala treatment plant the proposed PURE investment include e.g. new online measurement equipment to improve the process control and balancing. Usual problems in the other quite modern WWTPs concern sludge settleability and thickening issues. A future PURE workshop in Lübeck will concentrate on sludge handling.

See details of the project progress in the end of 2010 in the first PURE Newsletter .

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Riga workshop gathered PURE partners in October 2010. Photos: PURE/Riga Water

October 2010: Technical audit reports to be completed in November

The consultant for PURE technical audits, Pöyry Finland Oy, has started the auditing of PURE partner WWTPs in May 2010. By September 15th, proposals for investments to be realized with PURE funding have been presented to Brest and Jurmala WWTPs. The detailed planning for Brest and Jurmala investments will be ready in October as well as the draft audit reports for Gdansk, Kohtla-Järve and Szczecin WWTPs. The reports will be discussed in PURE Riga workshop (20-21 October 2010) and finalized by the beginning of November.

August 2010: Public procurement for Riga investments is going on

In August 2010, Riga Water launched a call for tenders for flow meters and container for ferrosulphate dosing to be purchased in PURE project. Decanter centrifuge for better excess sludge handling is to be purchased by the end of 2010 as well.

July 2010: Public procurement for external expert in PURE technical audits and sludge handling studies was completed in June 2010

John Nurminen Foundation has contracted Pöyry Finland Oy to perform the PURE technical audits in the waste water treatment plants of Brest, Gdansk, Jurmala, Kohtla-Järve and Szczecin. Pöyry Finland Oy won also the open tender for leadership of PURE sludge handling studies. Altogether 7 proposals were given for consultancy in PURE technical audits and 8 proposals for leadership of the sludge handling studies.