Physico-chemical Characterization of Industrial Effluents from the Town of Ouargla (South East Algeria)

Abstract

International audienceIn order to preserve the quality of our environment and public health, regulatory treatment of pollutants is constantly changing to more restrictive standards. Thus, the problem of organic pollutants has emerged as a major issue in the treatment of industrial wastewater (ERI). The objective of this work was the evaluation of the above organic pollution load of wastewater from some industrial sites in the city of Ouargla (Algeria). The water samples were collected from seven different sites, hospital, washing stations, a slaughterhouse and a processing plastic plant. The physico-chemical characterization of raw sewage revealed that these releases are loaded with organic matter in terms of COD (153.6 to 36120 mg/L) BOD5 (100 to 4700 mg/L) TSS (29 to 14702 mg/L). For the majority of the studied parameters, Algerian industrial waste often exceeded the required standards, since wastewater has a high organic load (BOD5/COD = 0.012 to 0.45 and TSS/BOD5 = 0.2625 to 73.51, COD/BOD5 = 2.23 to about 80000), showing in most cases poor biodegradability

The Physico-Chemical Quality of Effluents of Selected Sewage Treatment Plants Draining into River Rwizi, Mbarara Municipality, Uganda

“…Furthermore, colour did not vary significantly during dry and wet seasons because the effluents were not influenced by runoffs from the rains and soils since the wastewater was pipped direct to sewage plants. This was also similar to the study by [14] [17]. Journal of Water Resource and Protection…”

“…Lack of significant variation of temperature between the two sampling sites (Kakoba, Taso) is probably due to location of the sewage plants within similar geographical area (Mbarara municipality) with relatively uniform weather conditions. However, the slight differences could be attributed to the variation in sampling time as was similar to [14].…”

Characteristics and potential treatment technologies for different kinds of wastewaters

“…The highest BOD 5 was recorded for the SWW of 400 mg/L. High BOD 5 value for SWW could be explained by the abundance of organic matter (rumen debris) and the concentration of blood in the effluent (Messrouk et al, 2014). The lowest value of BOD 5 was obtained for MWW of 44 mg/L.…”

“…The BOD 5 /COD referred to biodegradability ratio in the effluent wastewater discharges. It is essential to evaluate and obtain the biodegradability ratio for different kinds of raw wastewaters before selection of appropriate treatment technique, because it is generally considered the cut-off point between biodegradable and nonbiodegradable waste (Messrouk et al, 2014). If BOD/ COD is greater than 0.6 then the waste is fairly biodegradable, and can be effectively treated biologically.…”

“…Referring to the standards of the EPA (2003) and Iraqi disposal standards (2011), the measured temperature parameter for all types of the wastewaters were below the allowable limits. The temperature variation from one site to another and from one sample to another is due to weather conditions and time of sampling but regional ecosystem may also be involved (Messrouk et al, 2014). pH is one of the most important parameter which has effect on the biological activity within the wastewater.…”