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From the graph it can observed that the removal efficiencies of colour and turbidity increase when the GO dosage is increased. This occurs up to certain level when, as the adsorbent dosage is further increased, the percentages of removal increase slightly until they remain essentially constant. If the Go dosage increase was continued in the tests, the removal efficiencies would probably remain constant; however, the costs for the adsorbent would rise, which on a large scale would lead to higher operational costs. From an economic point of view, the study of the optimum dosage of adsorbent is useful when selecting the acceptable amount of adsorbent for industrial applications.

Figure 5 From the graph it can observed that the removal efficiencies of colour and turbidity increase when the GO dosage is increased. This occurs up to certain level when, as the adsorbent dosage is further increased, the percentages of removal increase slightly until they remain essentially constant. If the Go dosage increase was continued in the tests, the removal efficiencies would probably remain constant; however, the costs for the adsorbent would rise, which on a large scale would lead to higher operational costs. From an economic point of view, the study of the optimum dosage of adsorbent is useful when selecting the acceptable amount of adsorbent for industrial applications.

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The sample is taken from a textile mill WWTP the colour of sample is dark blue in colour. The raw wastewater collection took place after the wastewater had passed through a screen for coarse particles separation. The raw wastewater sample was used in full concentration during the tests. Another sample of treated effluent coming from the last stages of the industrial laundry WWTP was also collected in order to compare it with the wastewater sample treated using GO. The initial characteristics of wastewater sample
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Dosage of the product used is one of the most critical parameters that has to be considered in wastewater treatment as it has an important effect on the treatment efficiency. Thus, to evaluate the effect of changing the volume ratios of GO suspensions and the effluent sample, GO/effluent ratios of 1:25, 1:30, 1:40, 1:50, 1:100, 1:150, 1:200, and 1:250 (mL mL~-1) were used. Samples were placed under constant stirring for 1 hour at room temperature. It is possible to verify the variation within the removal efficiencies of apparent colour and turbidity consistent with the GO concentration within the medium.[4]
Dosage of the product used is one of the most critical parameters that has to be considered in wastewater treatment as it has an important effect on the treatment efficiency. Thus, to evaluate the effect of changing the volume ratios of GO suspensions and the effluent sample, GO/effluent ratios of 1:25, 1:30, 1:40, 1:50, 1:100, 1:150, 1:200, and 1:250 (mL mL~-1) were used. Samples were placed under constant stirring for 1 hour at room temperature. It is possible to verify the variation within the removal efficiencies of apparent colour and turbidity consistent with the GO concentration within the medium.[4]
experimental results, and analyzing them from a cheap point of view, changing the pH during the method won't be necessary. Considering that up to a pH of ~6 (close to the raw textile wastewater) the apparent colour and turbidity removals were nearly 70% and 90%, respectively, it was decided not to proceed with pH correction. Kinetics of contaminants removal using GO
experimental results, and analyzing them from a cheap point of view, changing the pH during the method won't be necessary. Considering that up to a pH of ~6 (close to the raw textile wastewater) the apparent colour and turbidity removals were nearly 70% and 90%, respectively, it was decided not to proceed with pH correction. Kinetics of contaminants removal using GO
To investigate adsorption kinetics, 30 mL aliquots of the textile wastewater sample were added tc flask. Then, 1 mL of GO was added to every flask. The flasks were placed under constant stirring (300 rpm) at room temperature (28 + 3°C) for different time intervals, namely 5, 10, 20, 30, 40, 60, 90, and 120 minutes. Apparent colour and turbidity at different time intervals were quantified in order tc determine the removal efficiencies (% R) The results of the kinetic study that evaluated contaminants removal from textile wastewater are giver in, which shows the rise within the removal efficiencies of apparent colour and turbidity over time. As observed, there is a considerable increase in the percentage removal during the first 5 minutes. Afte: that, increases within the removal efficiencies begin occurring gradually until they reach equilibrium In general, the system reached steady-state in >1 hour. After 1 hour, the apparent colour remova efficiencies began oscillating around 66% and turbidity near 86%.
To investigate adsorption kinetics, 30 mL aliquots of the textile wastewater sample were added tc flask. Then, 1 mL of GO was added to every flask. The flasks were placed under constant stirring (300 rpm) at room temperature (28 + 3°C) for different time intervals, namely 5, 10, 20, 30, 40, 60, 90, and 120 minutes. Apparent colour and turbidity at different time intervals were quantified in order tc determine the removal efficiencies (% R) The results of the kinetic study that evaluated contaminants removal from textile wastewater are giver in, which shows the rise within the removal efficiencies of apparent colour and turbidity over time. As observed, there is a considerable increase in the percentage removal during the first 5 minutes. Afte: that, increases within the removal efficiencies begin occurring gradually until they reach equilibrium In general, the system reached steady-state in >1 hour. After 1 hour, the apparent colour remova efficiencies began oscillating around 66% and turbidity near 86%.
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