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Presentation of Draft design of Wastewater treatment plant locations for Municipality of Herceg Novi
After previous presentation of Wastewater disposal project for Municipality of Herceg Novi, Public Utility Company “Water supply and wastewater” Herceg Novi together with Municipality of Herceg Novi, Vodakom and consultant company Dahlem, during last two months have been working on more detailed analysis of existing sewerage network , quality of wastewater of faecal origin on territory of this Municipality as well as on potential locations for wastewater treatment plant. That is the main reason for today’s presentation, whose main objective is presentation of economic parameters of wastewater treatment plant construction within I phase of implementation according to Koks Feasibility study of Master plan.
First of all, we would like to remind you of preliminary design for future sewage network in Municipality of Herceg Novi:
Future sewage system will be constructed in the same way as the old one, by system of gravitational and pressure lines, pumping stations with overflows and generators. The sewage system will include:
-central wastewater treatment plant at Meljine
- main pumping station and overflow at Meljine
-western primary system - from Njivice and Igalo to Meljine
-eastern primary system – from Kamenari to Meljine
|
Measures |
Estimated value of Construction works/€ |
1. |
Construction of eastern primary system (from Kamenari to Meljine)including pumping stations and pressure lines |
5.000.000,00 € |
2. |
Construction of one part of western system(from Forte Mare to Meljine) |
700.000,00 € |
3. |
construction of new pumping station at Meljine and connection to WWTP |
800,000,00 € |
4. |
construction of new main sea outfall at Meljine |
500.000,00 € |
5. |
5. construction of WWTP at Meljine (I phase) |
6.500.000,00 € |
|
Total estimated value of I phase of implementation |
13.500.000,00 € |
It should be mentioned that in addition to these measures in the first phase of implementation rehabilitation of a part of existing primary system is also planned, but the exact measures to be taken will be known after CCTV inspection that is in course. Procurement of new truck with high pressure for proper operation of sewer network is also planned in this phase of implementation.
-Central Wastewater treatment plant is planned to be located at Meljine, more precisely at Nemila. At the chart, you can see two marked locations that are to be discussed as potential site for Wastewater treatment plant. On this location, it is necessary to be done expropriation of the land by Municipality of Herceg Novi, which represents the first economic fact that will affect the price of the plant.
- Although Koks in his Feasibility study of Master plan suggested three variants of wastewater treatment, Consultant “Dahlem” according to its program began with detailed analysis and comparison of different technologies that will present in the study and suggest the most appropriate technical and economic solution that will satisfy needs and possibilities of our Municipality.
- According to Koks study estimated value of the plant is 6,5 milion €, main parameters that were taken into consideration are given in the following chart:
Parameter |
|
Project Period |
2031 |
1. Population evaluation |
|
2. Total flow of wastewater |
|
3. Total BCO5 (biological consumption of oxygen) load |
6,037 kg/dan |
4. Total SM load |
|
5.Total TKN load |
|
6. Total P load |
|
We should also mention that after construction of wastewater treatment plant skilled people, trained for that kind of job, would maintain the plant. Disregarding chosen technology, this plant will have its own expenses such as necessary materials, filters, electric power…that will provoke increase of sewage system fees. In the Municipality of Herceg Novi this fee is 0,10€/m3 of consumed water for housing and it is paid by citizens who are connected to sewer system or have technical possibilities for connection. In his study, Koks suggested increase of the fee cost for 155% that will cover the expenses for maintenance of the Wastewater treatment plant. That means that instead of 0.10€/m3 wastewater system fee would be 0.30€/m3 for citizens and 0.70€/m3 for economy. Anyway, the local Parliament of Municipality of Herceg Novi must approve any change of fees for water supply and wastewater disposal, thus these issues will be discussed in due course.
-Future Main pumping station will be located at Meljine, at the place of existing pumping station “Meljine” and will collect all wastewater from western and eastern primary sewage system and by pressure line lift it to Treatment plant, from where treated water will go by gravitational line to new sea outlet and into recipient.
-On this location the height to which wastewater must be pumped is approximately 10 m, which does not require big expenses for electricity bills, and that was one of the reasons to abandon the location at Kumbor that was described in Master Plan. The length of sea outlet will be minimum 500m which will be specified in its project.
- As for Western primary sewage system which will cover following settlements – Njivice, Igalo, Topla, Herceg Novi, Savina and one part of Meljine, considering that big part of this system already exists and is in function, in this phase of implementation it is planned to construct new main sewage system from pumping station Forte Mare to new pumping station Meljine (because the existing system now goes in the opposite direction).
-Eastern primary sewage system will cover following settlements – Kamenari, Bijela, Baošići, Đenovići, Kumbor, Zelenika and one part of Meljine. This part of primary system is divided according to local communities and future pumping stations, which are 13 from Kamenary to Meljine. On certain position along the Riviera a part of this system and a number of pumping stations has been already constructed or is under construction, and completion of primary system whose estimated value is approximately 5 million € will depend on financial resources.
Construction of Wastewater treatment plant and discharging of treated water instead of untreated into the sea, will improve bathing water quality in the bay and complete environmental situation in Herceg Novi and region.
It is very important to inform citizens of Herceg Novi what are the benefits of construction of such plant. In its favour are laboratorial analyses of wastewater that is discharged untreated in the sea. Koks took samples of wastewater from territory of Herceg Novi and made physical, chemical and microbiological analyses which are published in his study. The analyses had shocking results; all tested parameters are far above those that are prescribed by Standards of Republic of Montenegro and “Regulations of wastewater quality and disposal in public sewage system and natural recipient”.
Some of these parameters are relevant for drawing up plans for plants and choosing future technologies.
While analysing and choosing adequate process and technology of wastewater treatment, which are the most challenging aspects of wastewater treatment plant planning, following parameters should be taken into consideration:
- Current standards for discharge of effluents into specific natural recipient
- Potential usage of treated effluent
- Category of wastewater
- Available means for disposal of final pollutants
- Economic and ecological justification for different systems
- Availability of land
The goals of comparison of different alternative technologies for wastewater treatment are the following:
- to chose the best solution which includes quality standards of effluent and restriction of environmental demands
- to respect law and regulations
- to define necessary plot of land
- to optimise investment and operational expenses
It should be mentioned that current laws of Republic of Montenegro are in process of reconciliation and harmonization with laws of European Union.
As we have already said, more detailed analyses of technologies for wastewater treatment plant will be presented in following months by Consultant “Dahlem”, and it will be good base for engineers who will draw up the plans for the plant.
Jelena Đaković, Civil engineer
Sewage department Manager
