Name of the case study
Description of context
The specific objectives in the water sector are to guarantee sufficient quality and quantity of water supply to both the population and the industrial enterprises by:
One of the conclusions made in the scan analysis outlined that “while the water supply infrastructure is relatively well developed and covers almost all of the population, the level of development of sewage system and urban waste water treatment plants is much lower and might be assessed as unsatisfactory.”
Adopted in 1999 National Program on Priority Construction of Urban Waste Water Treatment Plants (National Program) set 19 priority actions according to the analysis results and the specific objectives. Among them 5 concern the reduction of the water pollution and the construction of the urban waste water treatment plant within the.
Description of project - background
The National Program concerns settlements with equivalent population [population equivalent (p.e.) – the amount of oxygen-demanding substances whose oxygen consumption during biodegradation equals the average oxygen demand of the waste water produced by one person. For practical calculations, it is assumed that one unit equals 54 grams of BOD per 24 hours. (United Nation Statistic Division – Environment Glossary);] over 10 000. It is currently implemented in 36 Bulgarian municipalities in order to meet a number of assessed shortcomings:
By the time the National Program started in 1999, the Urban Waste Water Plant of Samokov had been abandoned unfinished because of insufficient financial resources. The reasons for resuming the construction process were: (1) the number of the equivalent population (46 000 was above the minimum of 10 000 required by the National Program); (2) the Iskar river, where the waste water is discharged, is among the ones with highest ranking (with the strictest ecological requirements) in the country as it later provides drinking water for Sofia and flows into the Danube (see map below); (3) the current high percentage of urban sewage coverage (70% of the town) and (4) the availability of an already finalised executive projects for the plant and the adjacent technical infrastructure.
A Technical and Economic Report (TER) had been developed in late 1980s reviewing the whole sewage system of the town and the part of the collectors discharging the waste water to the planned UWWTP. It included: (i) analysis of the existing situation; (ii) argumentation for the support of future needs concerning the main and secondary sewage system collectors; (iii) design projects. TER had justified the need for six main collectors in the town.
The UWWTP was put into operation in 2001. A next step was the required urgent accomplishment of the adjacent urban water and the sewage network of six town collectors. The main collector (No.1) was already constructed but the rest collectors (from No.2 to No.6) discharging waste water into it were unfinished yet.
In 2004 collectors No.1 and No.4 are already functioning; collector No.6 is only partially built. Collector No.3 has no direct connection with the functioning of the UWWTP and will be constructed later on. According to the design project (included in TER), collector No.2 had to serve the historical town centre whereas collector No.5 a newly built residential quarter. Both had to discharge the waste water into the collector No.1. Because of the restricted local financial resources the Municipality had to apply for financial support within the running National Program. Only one of the two collectors (No 5 or No 2) could be included in the application and the construction of the other one had to be postponed.
Actors involved in the project:
Description of project - objectives/aims
The aims of the National Program are: (1) defining the priorities for construction of UWWTPs downstream the rivers; (2) upgrading, reconstruction and modernisation of existing UWWTPs; (3) planning and construction of new UWWTPs. 12 criteria (including equivalent population number, rank of the river, place of wastewater discharge etc.) were weighted according to an expert rating methodology called Criteria Relative Weight Evaluation (CRWE).
The aims of the projects were:
Description of project - time interval and stages
Two stages for realisation were outlined in the National Program based on the financial resources available and expected:
According to the National Program until the end of 2005 all the UWWTPs regarded should be accomplished and functioning.
The UWWTP project developed in three stages:
In 2001, Stage I was over (see photo below)) and Stages II and III started together.
Description of project - financing
The projects for UWWTP building and reconstruction are jointly supported under a co-financial scheme by:
The Municipality of Samokov is one of the municipalities included in the National Program. Its local UWWTP was chosen among 32 possible plants ranked by CRWE.
The financing of collector No. 5 construction has realised according to the active co-financial scheme proposed within the National Program (see above) in three stages:
The actual municipal financial contribution for the 3rd stage exceeded the initial anticipation in the project budget (10% of the financial support granted by NFEP) as additional works concerning the replacement of telephone cables and street pavement after the construction of the waste water system were not initially envisaged in the calculations. The collector construction is managed by Samokovconsult Ltd municipal company.
Description of project - other sectors involved
At national level a direct link with the waste sector is reported. The sediments from UWWTP should be stored in specialised waste depots which are not sufficient yet. A construction program for waste depots is going on in parallel.
What tools were used to assess sustainability?
Procedure for Criteria Relative Weight Evaluation (Tool used at National Level)
Technical and Economic Report (TER) + Local Priority Criteria (LPC) (Municipal Level)