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Monitoring and water quality assessment of lake mandra (lake mandrensko) in city of burgas (black sea) region of republic of bulgaria

Adnan Falah, HuseinYemendzhiev and Valentin Nenov

Background:For a purpose of water quality and assessment of the major sides west and east of lake Mandra(area of 38.84 km²) located in city of Burgas in the Black Sea, region of Republic of Bulgariawas investigated. and compared. Lake MandraTrends of the water quality parameters were collected, analysed and investigated in different seasons a year from year 2014 to 2018. Several water samples were collected from two regions of the lake (west and east point). The samples were taken approximately 10-20 meters from the lake line, where the depth was 0.5-1.0 meter. Several tests were conducted using high standard methods to identify the levels of inorganic substances and physico-chemical parameters. The purpose of this research is to identify the changes in the ecological state of the lake, to identify trends in water quality, to specify the influence degree of the pollutants (chemical and biological) over the biodiversity of the lake and eventual use for recreational purposes.
Results:Based on the analysed data, the pH was relatively basic, where it ranged between 7.9 and 9.2 with respect to both points of sampling (west and east) of the lake. Highest conductivity value recordedfor the eastern point of the lake was28,000.00 µs/cm (fall 2017) while the minimum recorded conductivity was 149.00µs/cm for westernpoint of the lake in the spring time (2018). Total Nitrogen concentration ranged between 1.32 – 3.85 mg/l (most analysis data, spring time) and lower than1.32 mg/l in winter time.
Conclusions: Based on results and study, several substances involving Cl, P, Fe, Mn, SO42- and others were at normal level. BOD, COD, Nitrogen with its different state as well as saturated Oxygen were also analysed to determine the impact of human, industrial activities on water quality during four seasons of the year. Some of the data collected for such parameters have showed low concentrations which is an indicator for desirable level of pollutiondespite the fact that the studied area is managed well so that for controlled part of the lake as well; indicating a non-polluted site for the lake.

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