Penjerapan di dalam turus lapisan tetap telah dicadangkan sebagai kaedah yang berkesan untuk rawatan air sisa industri. Objektif utama kajian ini adalah untuk mengkaji keberkesanan penyingkiran pewarna metil merah menggunakan karbon teraktif berasaskan tempurung kelapa di dalam turus lapisan tetap. Kesan parameter penting iaitu kadar kelajuan aliran (4-10 ml/min), ketinggian lapisan karbon (2-4 cm), dan kepekatan awal pewarna (20-60 ppm) terhadap lengkung bulus dan prestasi penjerapan disiasat. Hasil kajian mendapati bahawa lengkung bulus bergantung kepada ketiga-tiga parameter yang disiasat. Masa bulus untuk penjerapan pewarna metil merah berlaku lebih cepat dengan kadar kelajuan aliran yang lebih tinggi, ketinggian lapisan karbon yang rendah, dan kepekatan awal pewarna yang tinggi. Kapasiti penjerapan tertinggi direkodkan pada kadar kelajuan aliran terendah, kepekatan awal pewarna tertinggi dan lapisan karbon tertinggi iaitu 0.092 mg/g. Empat model yang terdiri dari model Adams-Bohart, Thomas, MDR dan BDST telah digunakan untuk menganalisa prestasi penjerapan di dalam turus lapisan tetap. Kapasiti penjerapan, kadar pemalar dan kadar penentuan bukan linear (r2) bagi setiap model telah dikira. Model Thomas dan MDR amat serasi dengan data penjerapan.Ia dibuktikan dengan r2 yang tinggi (0.98-0.99) dan SSE yang rendah (0.019-0.0002) yang diperoleh dari kedua-dua model ini.Bagi peningkatan skala sistem penjerapan, jumlah ketinggian lapisan karbon bagi peningkatan skala untuk masa bulus 24 jam ialah 75.33 cm dan ia amat sesuai bagi industri yang beroperasi 24 jam sehari.Peningkatan skala untuk diameter berdasarkan peningkatan kadar kelajuan aliran menunjukkan hasil nilai diameter yang boleh diterima bagi kegunaan industri. Ini menunjukkan bahawa peningkatan skala bagi sistem ini adalah relevan.
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The continuous fixed bed adsorption has been proposed as an effective method for the removal of pollutants from the industrial waste water in industrial applications. The main objective of the study was to investigate the effectiveness of methyl red dye removal by coconut shell activated carbon (CSAC) in fixed-bed column. The influence of important parameters which are feed flow rate (4-10 mL/min), bed height (2-4 cm) and initial dye concentration (20-60 ppm) on the behaviour of the breakthrough curves and adsorption performance was studied. The results indicated that the breakthrough curves were dependent on all the three parameter studied. The breakthroughs time for the adsorption of methyl red dye occur faster at higher flow rate, lower bed height and higher concentration. The highest adsorption capacity was recorded at lowest flow rate, lowest initial concentration and highest bed height which was 0.092 mg/g. Four models which consist of Adams-Bohart, Thomas, MDR and BDST model were used to analyse the performance of the column adsorption. The adsorption capacity, rate constant and non-linear regression coefficient (r2) of each model was calculated. The result shows that Thomas and MDR model fitted well with the adsorption data. It was proven by high r2 (0.98-0.99) and low SSE (0.019-0.0002) obtained by both model. For scale-up of fixed bed adsorption column systems, the total bed height for scale-up of 24 hours breakthrough time is 75.33 cm and it is well-suited for industries that operate for 24 hours. The scale up for diameter based on increasing flowrate shows an acceptable diameter size for industrial purpose which concludes that the scale up for this system is applicable.
Fixed bed adsorption studies of methyl red using microwave-irradiated coconut shell activated carbon / Mohamad Hafiz Mohd Rusli