Contribution A La Caractérisation Physico-Chimique Des Effluents De La Cosumar (Casablanca, Maroc) En Vue De Leur Traitement Approprié

Abstract

The production process of the agro-food industry is aimed to ensure consumer’s solvency and satisfaction. As a result, these industries are accelerating their pace and rate of production by resorting to the intensive use of natural resources, especially water and energy. This production rate is accompanied by an increase in the volume of wastewater. According to the normative and legal requirements governing the protection of environment, this wastewater requires characterization in order to guide the choice of their treatment system and recovery. This paper focuses on the physicochemical characteristics of sugar agro-food industry wastewater (Cosumar-Morocco) in order to guide the choice of their appropriate treatment, allowing the reduction of their impacts and nuisances on the marine receiving environment or their reuse. The results obtained, following a follow-up of 4 months (March, April, May and June 2015), revealed that the industrial wastewater of Cosumar is relatively warm and basic with average values of temperature and pH respectively equal to 42, 71 ° C (± 2.61) and 9.38 (± 1.64). These liquid effluents also exhibit a high charge of oxidable matter (average COD=4801.33 mg.l-1 (±2342.66), organic matter (BOD5=3959.01 mg.l-1 ±2293.65), and particulate matter (average solids content = 275, 5mg.l-1±143.25). Moreover, the raw wastewater presents a strong mineralization, which is justified by an Electrical Conductivity of 6828.33 μs.cm-1 (±1704.44) and a Sulphate content of 94.33 mg.l-1 (± 31.66). The average concentrations of Kjeldahl Nitrogen and total Phosphorus are 6.5 mg.l-1 (± 2.54) and 0.67 mg.l-1 (±0.562) respectively. The COD/BOD5 ratio is 1.21, indicating the biodegradability of the wastewater produced, through which the biological treatment can be recommended.

Comparative Study of Ceramic Membranes Developed on Different Algerian Natural Clays for Industrial-Effluent Filtration

“…This increasing ratio suggests an increase in non-biodegradable organic matter [57,59]. The COD/BOD5 ratio values obtained in Tables 4-6 for the permeate collected after filtering of our effluent on the three membranes investigated at varying pressures are significantly lower than 3 (between 0.74 and 0.94), indicating that these are readily biodegradable effluents [61]. The COD/BOD5 ratios of the effluent before filtering and the liquid retained in the feed tank, on the other hand, are between 2 and 3, indicating that they are moderately biodegradable effluents [57][58][59]61]; indeed, as stated by Mesrouk et al [60] and Litébé et al [65], an analysis of this ratio clearly highlights the biodegradability of wastewater.…”

“…The COD/BOD5 ratios of the effluent before filtering and the liquid retained in the feed tank, on the other hand, are between 2 and 3, indicating that they are moderately biodegradable effluents [57][58][59]61]; indeed, as stated by Mesrouk et al [60] and Litébé et al [65], an analysis of this ratio clearly highlights the biodegradability of wastewater. These findings indicate that all of our samples, both before and after membrane filtration, may be purified using biological treatment [58,61].…”

“…This result indicates that the examined samples do not constitute a thermal-pollution concern to the receiving natural environment. Values over 30 • C, on the other hand, contribute to the acceleration of biological processes for the treatment of industrial effluents by increasing the kinetics of organic degrading matter [61].…”