Survey of the physico-chemical quality of the wastewaters of Biskra city rejected in Chabat Roba, Messdour and Wadi Z'ommor (Algeria)

Abstract

The wastewaters of the agglomeration of Biskra (Southeast Algeria) are poured without treatment in three main dismissals that are Chabat Roba (1^st site), Messdour (2^nd site) and Wadi Z'ommor (3^rd site). The pollution charge determined in the 1^st site is the order of 157.76 ± 34.14 mg/L of O₂ for the BOD₅ (Biochemical Oxygen Demand in 5 days) of 457 ± 73.59 mg/L of O₂ for the COD (Chemical Oxygen Demand) and 1109 ± 110.56 mg/L for the TSS (Total suspended Solids). In the 2^nd site, the polluting charge is in average of 156 ± 29.72 mg/L of 'O₂ for the BOD₅, 430.76 ± 29.81 mg/L of O₂ for the COD and 1157.92 ± 76 mg/L of O₂ for the TSS. The 3^rd site, the polluting charge is represented by 152.92 ± 27.76 mg/L of O₂ of BOD₅, 381.69 ± 70.03 mg/L of O₂ of COD and by 1039 ±106.65 mg/L of O₂ of TSS. The follow-up of these parameters in the three sites puts in evidence instability of the organic charge during seasons. The COD/BOD₅ report equal 3 for the 1^st site, this elevated value, watch that these waters are characterized by an inorganic pollution probably due to the industrial origin. With regard to the 2^nd and 3^rd sites, the COD/BOD₅ report is between 3 and 2.5 for the first and between 2 and 2.50 for the second. The results defined the urban nature of the rejection poured in these sites.

Key words: Wastewaters, Biskra, COD/BOD₅ report, pollution charge, TSS.