A new method to calculate the activity of a stable compound in a binary phase diagram was presented and discussed. According to the formula for calculating activity from the binary phase diagram, the equilibrium const...A new method to calculate the activity of a stable compound in a binary phase diagram was presented and discussed. According to the formula for calculating activity from the binary phase diagram, the equilibrium constant can be calculated through the mass action principle after the activities of two pure components were computed respectively. Based on that, the activity of a stable compound can be easily obtained at last. The activity of the stable compound InSb is calculated in the In-Sb binary system by using this method. The result is well consistent with another calculation value.展开更多
The goal of this study is the evaluation of pollution by the physic-chemical characterization of urban wastewaters discharged in the river R’dom of the town Sidi Kacem. The motivation of this study is multiple firstl...The goal of this study is the evaluation of pollution by the physic-chemical characterization of urban wastewaters discharged in the river R’dom of the town Sidi Kacem. The motivation of this study is multiple firstly to give an answer to the choice of methods of treatment of raw sewage and secondly to raise awareness of the pollution of the river R’dom who is a source of irrigation in the region. The physic-chemical analyses were carried out on the level of the collector 1 (domestic collector of the Zaouia District) and that of collector 2 (domestic collector of the allotments Thami Amar, road of Tangier and Saada), during the year 2012 at the same time “in situ” and at the Laboratory of Environment (Faculty of Sciences Kenitra). The polluting load out of organic matter (DBO5, DCO, MES), out of mineral matter (Cl-, Ca2+, Mg2+, K+, , Na+) and out of nitrogenized matter (, , Nitrogenize total) was more important, except for the temperature and of the pH which are in conformity with the Moroccan standards of rejection. Ratios DCO/DBO5, DBO5/DCO and MES/DBO5 inform about the biodegradability of these effluents and permitted choice of the suitable treatment process. Indeed, results obtained show that the domestic effluents exceed the national standards of rejection, which requires an intervention of the competent jurisdictions in order to preserve the public health, to protect the environment and install an efficient sewage treatment plant to ensure a sustainable development.展开更多
基金This work is financially supported by the National Natural Science Foundation of China (No. 50074036).
文摘A new method to calculate the activity of a stable compound in a binary phase diagram was presented and discussed. According to the formula for calculating activity from the binary phase diagram, the equilibrium constant can be calculated through the mass action principle after the activities of two pure components were computed respectively. Based on that, the activity of a stable compound can be easily obtained at last. The activity of the stable compound InSb is calculated in the In-Sb binary system by using this method. The result is well consistent with another calculation value.
文摘The goal of this study is the evaluation of pollution by the physic-chemical characterization of urban wastewaters discharged in the river R’dom of the town Sidi Kacem. The motivation of this study is multiple firstly to give an answer to the choice of methods of treatment of raw sewage and secondly to raise awareness of the pollution of the river R’dom who is a source of irrigation in the region. The physic-chemical analyses were carried out on the level of the collector 1 (domestic collector of the Zaouia District) and that of collector 2 (domestic collector of the allotments Thami Amar, road of Tangier and Saada), during the year 2012 at the same time “in situ” and at the Laboratory of Environment (Faculty of Sciences Kenitra). The polluting load out of organic matter (DBO5, DCO, MES), out of mineral matter (Cl-, Ca2+, Mg2+, K+, , Na+) and out of nitrogenized matter (, , Nitrogenize total) was more important, except for the temperature and of the pH which are in conformity with the Moroccan standards of rejection. Ratios DCO/DBO5, DBO5/DCO and MES/DBO5 inform about the biodegradability of these effluents and permitted choice of the suitable treatment process. Indeed, results obtained show that the domestic effluents exceed the national standards of rejection, which requires an intervention of the competent jurisdictions in order to preserve the public health, to protect the environment and install an efficient sewage treatment plant to ensure a sustainable development.
