This study aims to evaluate the performance of the sewage treatment plant of the lagunage type with activated sludge located in the town of Skhirat of the area Rabat-Sale-Kenitra in the vicinity of the Atlantic Ocean. Sampling was carried out monthly during the year 2013 follow- up by specific physicochemical analyses in terms of the chemical demand for oxygen (DCO), the biological request oxygenates of them (DBO5) and suspended matter measures it (SM).
These parameters are measured at the laboratory by the device DCOmétre, DBOmétre as well as SM by a cellulose membrane filter. On the level of this sewage treatment plant, the output acquired in terms of DCO, DBO5 and SM is respectively of annual percentage average of about 87,26%, 88,35% and 68,37% what is very significant on the level downstream of this STEP and conforms to the national standards and international ; this is confirmed by the Test t unilateral for two matched samples represented by one p-value 0.0001 significant for the difference between the averages of entry and exitof the STEP. As well as the ratios of DCO/DBO5 and DBO5/DCO, indicate to us that the biodegrad ability is not difficult, represented respectively by values of about 2,05 and 0,49 what means what means that thisstation uses a kind of satisfactory biological treatment.
The objective of this study is the evaluation of the groundwater’s quality of the region Zegit-Oulmes by analysis of some physico-chemical parameters as pH, redox, conductivity, salinity, solids dissolved, oxygen and temperature. These parameters have been measured by a kind Consort C535 and Hanna Instruments HI 98280 multi-parameter Analyser. The chemical oxygen demand (COD) was measured by a multiparameter photometer HANNA type C 214 (HI 83214), the biological oxygen demand (BOD5) by a Dbometre for five days and turbidity by a turbidimeter.
The electrical conductivity is about 2836,6 ± 229.4 µS/cm, dissolved oxygen about 6.66 ± 3,84 mg/l, about 84,86 ± 56,16 NTU turbidity, chemical and biological oxygen demand are respectively about 166 ± 133.4 mg O2/l and 40.66 ± 29.73 mg O2/l. These results indicate that the groundwater’s quality in Zegit-Oulmes is bad and the measures exceed the national standards, which poses a serious problem for their direct consumption.
In this work, we investigate the hydrochimy of surface water of the Senegal River (the Mauritanian delta of the city of Rosso). After several years of domestic exploitation: agricultural and industrial one, besides the climate changes in the area, it is interesting to make sure of the quality of water. With this intention, we tried to carry out a physicochemical evaluation, to have an idea on the probabilities of pollution and the effect of the seasonal variation of the climate on water of this river.
For that a sampling was carried out during every season of 2015 at the five stations on the axis of the river at the city of Rosso. The followed physicochemical parameters are : T°C, pH, C.E, the total hardness (TH), Ca2+, Mg2+ , Na+, K+ , NH4+, CL-, NO2-, NO3-, HCO3-, CO2, SO4--,TA, TAC and suspended matter. These measures comprise volumetric analysis, spectroscopic, Potentiometric.
Statistical exploitation of the results and their comparison with the European standards of potability of water has shown that there is a true deterioration of the quality of water of the Senegal River. The content of nitrite varies between 0.13 mg/l and 1.6 mg/l with an average about 0,55mg/l which exceeds the standard (0.1 mg/l).The content of bicarbonate varies between 18 mg/l and 61 mg/l with average value36, 14mg/L exceeds the standard (30 mg/l).The content of carbon dioxide varies between 6.94 mg/l and 28.45 mg/l with average value 17.26 mg/l exceeds the standard (10 mg/l).
A quality control of water of the Senegal River must be required and updated in particular the reduction of the domestic and industrial effluent of the factories located at the shore of this river.
The management of leachate flow is a challenge for the operation of landfills in Morocco. This Essaouira which started in 2001, received in 2014, 72 tons of waste as daily average. This buried tonnage generates between 6 and 8 m3/d leachate The objective of this study is to follow the evolution of the physico-chemical composition of leachate stored and therefore assess the purification performance of the adopted treatment system. To do this, leachate samples were collected and analyzed during the period from 2012 up to 2015. The analysis results show that despite the long stay in the leachate storage basin, the pollution organic and inorganic filler, is significant and almost stable over time. The organic pollutant load is expressed as COD varying between 6106 and 13939 mgO2/L with a mean of 10361mgO2/L. It also resulted in BOD5 which is between 207 and 851 mgO2/L, with an average of 631 mgO2/L. Therefore the ratio of BOD5/COD is between 0.03 and 0.08 with an average of 0.06. This shows that the leachate studied are old and characterized by complex organic load and nonbiodegradable. Mineral pollution is also present and marked by a high electrical conductivity which reached an average value of 39983?s/cm. The values of this organic and inorganic pollution, far beyond the limits of direct discharge into the receiving environment. The metal composition of leachate is typical of landfills for household dominant. In fact the values obtained during this monitoring does not exceed the thresholds set by the Moroccan standard rejection besides chromium (avg=1720 mg/l) which has a much higher concentration than other discharges and which exceeds Moroccan standards rejection (avg=200?g/l).
Fouarat's swamp is one of the Gharb's region wetlands. It represents a habitat for an important fauna and flora witch are clearly in perpetual seasonal changes. In order to enhance this area, and to show its importance in the local, regional and national biodiversity, we undertook to study its avian biodiversity, including that of the Ard
The objective of this study is to evaluate the degree of pollution of wastewater from the city of Nouakchott, Mauritania, including the entry of the wastewater treatment plant (WWTP) with a physic-chemical characterization of the raw water. The average values of the pollution load in terms of organic matter BOD5, COD, nitrogen material of ammonium NH4 +, suspended matter and ortho-phosphate PO43- are 538.71 mg / l, respectively, 1806.76 mg / l 110.8 mg / l, 658.45 mg / l and 111.47 mg / l. The pH and temperature were determined by a pH meter type HANNA Instruments HI 9622. The conductivity was measured by a type of portable conductivity meter Hanna, COD by a spectrophotometer and a model 45600 COD reactor and the BOD5 a OxiTop and ammonium ions, orthophosphates are analyzed by colorimetric methods using a UV spectrophotometer Visible type 722 S Beijing. The results achieved show that these raw sewage at the entrance to the WWTP are too loaded pollutants exceeding the standards. A principal component analysis (PCA) was applied showing an inertia of 69.61% of F1 and F2 axes exploring the most polluted month. Due to the ancient of the treatment plant in the city of Nouakchott in Mauritania and the increasing rate of the population of this city so far, it requires renewal and reconstruction of a WWTP that meets the requirements international.
Hospitals could be the cause of pollution that must be considered in an overall assessment of the health and environmental risk approach. This study is part of the characterization of hospital liquid discharges from a region in Morocco, whose objective is to evaluate their physicochemical quality, biological. The physico-chemical analyzes of 72 samples taken during one year showed a large fluctuation of certain parameters such as BOD5, COD, TSS, PH, temperature, and significant bacterial load: Total coliforms, E. coli, fecal streptococci, pathogens such as Salmonella, Staphylococcus, 10% multi-resistant, virulent germs character to emerge as: Pseudomonas aeruginosa, the end of this study, it turned out that the hospital effluents are loaded with pollutants. We hope in the light of the results from this study have led to a real awareness of the competent authorities on strengthening and improving hospital for the treatment of liquid waste as developed countries view the impact of these effluents on human and environmental health is harmful and can extend to the spread of emerging diseases.
The objective of this study is to evaluate the degree of pollution of oil extraction olive waste water discharged directly to the receiving environment (Wadi R'dom the Sidi Kacem city). And the problems posed qualifies them as liquid material polluting the environment the case of surface waters and low-flow land application, the results of some physic-chemical parameters in terms of conductivity, salinity, biological demand oxygen (BOD5), chemical oxygen demand (COD), the rate of sediment dissolved (TDS) and suspended solids (SS) are respectively significant mean values of the four study sites 22.61
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