The potential use of banana stem adsorbent has been investigated via batch adsorption experiment. A series of batch experiment was carried out to determine the effect of various adsorbent dosage ( 0.2 – 1.4 g) and various contact time ( 15 – 120 minutes). Analysis on adsorption isotherm was done using Langmuir and Freundlich model. In addition to it, the behaviour and mechanism of adsorption was analysed using kinetic model, namely Pseudo-first order and pseudo second order kinetic. The result shows that more than 90% of colour was removed at optimum dosage of 1 g of banana stem adsorbent in 100 mL synthetic dye at optimum contact time of 90 minutes. Analysis of isotherm models showed that the adsorption of colour by banana stem adsorbent was fitted to Freundlich with coefficient of determination, r1 of 0.917. Adsorption kinetics of colour showed that Pseudo-second order fit better (r2 = 0.99) than Pseudo-first order (r2 = 0.94) kinetic model. From the result, it was indicated that the adsorption of colour occurred by multilayer on a heterogeneous surface of the banana stem through the chemical reaction process. As a conclusion, the use of banana stem adsorbent has good potential for colour removal in textile wastewater treatment because of low cost of the media. Thus, it is an alternative to overcome problems related to an excessive of colour in dye wastewater treatment plant.
Batik industrial textile waste water effluent if improperly disposed to the catchment can cause the water pollution that will endanger human health and the environment. The contaminants discharge in the dye processing causes the water pollution. Banana peel is a potential agriculture waste that can be used to reduce the concentration of color from synthetic dye effluents. This study is aim to determine the potential of banana peel as agricultural waste adsorbent for Methylene Blue (MB) removal at different contact time (15minutes, 30 minutes, 45 minutes, 90 minutes, 120 minutes, 150 minutes, and 180 minutes) and different adsorbent dosage (0.05, 0.1, 0.15, 0.2, 0.25, 0.3, and 0.4 gram) and to develop kinetic model for Methylene Blue (MB) removal. The experiments were conducted at room temperature using batch study. As the banana peel dosage is added from 0.05 g to 0.4 g in 100 ml of Methylene Blue solution, the percentage of MB solution removal also increase from 34.69 % to 86.88 %, indeed due to the increase in phenolic compounds adsorption rates. The adsorption process reached the optimum contact time at 150 minutes with MB solution removal of 86.22 %. The kinetic data obtained specified that the data follow closely the pseudo-second-order. It is concluded that banana peel can act effectively as natural adsorbent in treating Methylene Blue (MB) from batik textile wastewater effluents.
Methylene Blue is a cationic dye that releases aromatic amines in many textile industries and can cause potential harm to human health. Agricultural waste has been explored for their adsorption abilities towards Methylene Blue dye from textile wastewater. This study described the performance of fixed-bed column using banana stem as filter media under the effect of various bed height (10, 30, 50 cm) and initial concentration of Methylene Blue ( 0.02 and 0.03 mg/L) to assess the breakthrough curve. From the fixed-bed column study, the column with initial Methylene Blue concentration of 0.02 mg/L and bed height of 50cm performed well in removing Methylene Blue from the synthetic Methylene Blue solution. The breakthrough time and exhaustion time were 953.57 minutes and 4560 minutes, respectively. As a conclusion, banana stem filter media is an effective alternative in removing Methylene Blue from textile wastewater.
Learning from experience approach has been widely adopted in the academic cluster of Built Environment including Civil Engineering field. To further strengthen this aspect, a study in exploring construction site visit as an aid to educational component in teaching and learning method is significant. This provide a platform which helps civil engineering students to enhance their safety knowledge and understanding by experiencing the real time situation at the construction site. The objectives of this study are to: (1) determine the effectiveness of site visit approach in teaching and learning of construction site safety (2) measure the performance between students who acquire knowledge related to safety by experiencing one site visit compared to students with zero site visit; and (3) compare the achievement and understanding between male and female students if site visit is adopted in the teaching and learning process. A set of questions is designed as an instrument and participating students are required to answer the questions nonverbally to show their knowledge on the construction site safety. Based on the scoring marks, a statistical analysis has been conducted. The result indicates that students with one site visit have better achievement and understanding compared to students with zero site visit. In addition, the result also shows that with one site visit, female students have better performance in the score marks compared to male students.
Keywords: construction site, experience-based learning, site safety, site visit
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