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Physical-chemical characterisation of the urban wastewater - case study of the Boumerdes region, North - Algeria

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Ait Baziz D. , Maazouzi A. , Lachache S.

tom no. 54

243--250

The objective of this study is to assess the physical-chemical quality of urban wastewater from the city of Boumerdès, in northern Algeria with regard to the threshold values for irrigation or their discharge in aquatic ecosystems. Five sampling points were carried out of the study area in April 2017. The results obtained of physical-chemical parameters indicating pollution show that the water course is exposed to pollution mainly of organic origin. It’s expressed by a high maximum value according to Algerian and World Health Organisation standards: chemical oxygen demand (COD 886 mg O2∙dm-3), biochemical oxygen demand (BOD5 490 mg O2∙dm-3), nitrate (NO3- 73.09 mg∙dm-3), nitrite (NO2- 6 mg∙dm-3), ammonium (NH4+ 23 mg∙dm-3) and phosphates (PO43- 7.3 mg∙dm-3). The COD to BOD5 rate of 1.8, show that the effluents must be treated before being discharged into the receiving environment. However, it is lower than 2, which makes them easily biodegradable and can be treated by a biological system such as a natural lagoon. It shows also a diversified origin of the pollution. It is predominantly domestic origin, it could have an adverse effect on public health, presenting a risk of environmental eutrophication, contamination of soil and water resources. The physical-chemical characterisation of the urban wastewater shows that they are quite loaded and prezent a pollution in nitrogenous compounds, a treatment is requested before the direct discharge to the receiving environment or their reuse in the irrigation.

The Distribution of Metals in Sediments of the Likova, Kumanova and Pçinja Rivers: Spring Season

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Ejupi N. , Korça B. , Durmishi B. H. , Durmishi A. , Ejupi E. , Ismaili M. , Jashari A. , Shabani A.

tom Vol. 19, nr 3

80--92

The pollution of rivers is an important issue because the utilization of polluted water has a direct effect on the health of people and other living beings, economy, etc. Sediments represent a very suitable indicator for monitoring and detecting pollution sources of river waters. The aim of this study is to analyze the contents of selected metals in the sediments of the rivers Likova, Kumanova and Pçinja rivers. The water samples were taken in June 2014 from six sampling stations. Several physicochemical parameters of rivers were determined and the contents of twenty-two metals was indicated in the sediment samples taken from these rivers. The obtained physico-chemical quality of the water from these rivers resulted in classification to the first/second category. The sediments were mostly polluted by Al, Ca, Na and Mg. The metals that exceeded the Dutch standard were: Ba, Ni, Zn, Cr and Cu. The order of metals in sediments was as follows: Fe > Al > Ca > Na > Mg > K > Mn > Ba > Sr > Cr > Zn > V > Ni > Cu > Pb > Li. The study results reveal a mild pollution in rivers caused by urban, agricultural and industrial activities.

The analysis of chemical parameters of groundwater before and after sand filtration in the Velekinca water treatment plant, Kosovo

86%

Beluli V. M. , Beluli V. M.

nr 48

Effect of the quality of shallow groundwaters on the occurrence of selected relic plant species of peatlands in the Łęczna-Włodawa Lakeland

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Serafin A. , Pogorzelec M. , Bronowicka-Mielniczuk U. , Serafin A. , Pogorzelec M. , Bronowicka-Mielniczuk U.