Elajel, Marwa Ali (2018) Effect Of Operational Parameters On Treatment Of Textile Wastewater By Electrocoagulation Process Using Different Electrode Materials. Masters thesis, Universiti Sains Malaysia.
|
PDF
Download (518kB) | Preview |
Abstract
Proses elektro penggumpalan telah digunakan untuk mengatasi masalah yang dihadapi oleh proses fiziko kimia konvensional dalam rawatan air sisa tekstil. Air sisa tekstil sebenar mengandungi pencelup reaktif selalunya bersifat alkali. Bahanbahan elektrod yang berbeza seperti zink dan keluli tahan karat boleh digunakan bagi mengatasi prestasi lemah elektrod aluminium dalam medium beralkali untuk rawatan air sisa tekstil sebenar. Prestasi proses elektro penggumpalan untuk rawatan air sisa tekstil sintetik (disediakan menggunakan pencelup biru reaktif 261) dan air buangan tekstil sebenar telah disiasat. Tiga jenis bahan elektrod iaitu aluminium, zink dan keluli tahan karat telah digunakan dalam kajian ini. Parameter operasi terlibat dalam kajian ini ialah ketumpatan arus (2-8 mA/cm2), kepekatan pewarna awal (20-100 mg/L) dan nilai pH awal (5-9). Kajian permulaan telah dijalankan menggunakan air buangan tekstil sintetik untuk menentukan keadaan operasi optimum yang memberikan penyingkiran pencelup yang tinggi untuk setiap bahan elektrod. Keadaan-keadaan optimum yang diperolehi ialah ketumpatan arus (4 mA/cm2 untuk semua elektrodelektrod), kepekatan awal pencelup (50 mg/L untuk elektrod aluminium dan 100 mg/L untuk elektrod zink dan keluli tahan karat) dan nilai awal pH (7 untuk elektrod aluminium dan 9 untuk elektrod zink dan keluli tahan karat). Satu penyiasatan yang menyeluruh dari segi penyingkiran pencelup, COD, kekeruhan, kehilangan berat elektrod, dan penggunaan tenaga dijalankan di bawah keadaan optimum (ketumpatan arus dan kepekatan pewarna yang awal) manakala nilai pH awal telah ditetapkan pada 9 bagi mewakili keadaan air sisa tekstil sebenar yang digunakan dalam kajian ini. Penyingkiran pencelup, kehilangan berat elektrod, dan penggunaan kuasa telah direkodkan sebagai 99.8%, 0.66 kWh/m3 dan 0.039% untuk elektrod zink, 99.1%, 0.70 kWh/m3 dan 0.066% untuk elektrod keluli tahan karat dan 75.8%, 0.50 kWh/m3 dan 0.41% untuk elektrod aluminium masing-masing. Rawatan air sisa tekstil yang sebenar di bawah keadaan operasi optimum (ketumpatan arus dan kepekatan pewarna yang awal) dan pada nilai pH semula jadi air sisa tekstil menunjukkan bahawa elektrod zink memberikan penyingkiran pencelup yang tertinggi (83.7%), kehilangan berat elektrod yang terendah (0.043%) dan penggunaan tenaga yang munasabah (0.69 kWh/m3). Kos operasi duga dianggarkan lebih rendah untuk elektrod zink (MYR 3.93 setiap 1 m3 air sisa terawat tekstil selama 10 minit) berbanding dengan elektrod aluminium dan keluli tahan karat. Oleh itu, elektrod zink dianggap sebagai bahan elektrod paling berkesan untuk rawatan air sisa tekstil yang mengandungi pencelup reaktif. _______________________________________________________________________________________________________ Electrocoagulation process (EC) has been used to overcome the problems related to the use of conventional physico-chemical process in treatment of textile wastewater. Real textile wastewaters containing reactive dyes are often characterized by their alkalinity. Different electrode materials such as zinc and stainless steel could be used to tackle the low performance of aluminum electrode in alkaline medium for treatment of a real textile wastewater. The performance of electrocoagulation process for treatment of a synthetic textile wastewater (prepared using reactive blue 261 dye) and a real textile wastewater was investigated. Three types of electrode material namely aluminum, zinc and stainless steel were used in this study. The operating parameters involved in this study were current density (2-8 mA/cm2), initial dye concentration (20-100 mg/L) and initial pH (5-9). The preliminary study was conducted using synthetic textile wastewater to determine the best operating conditions that would lead to high dye removal for each electrode material. The best conditions were current density (4 mA/cm2 for all electrodes), initial dye concentration (50 mg/L for aluminum electrode and 100 mg/L for zinc and stainless steel electrode) and initial pH (7 for aluminum electrode and 9 for zinc and stainless steel electrode). A thorough investigation in terms of dye removal, COD, turbidity, energy consumption and electrode weight loss was conducted under the best conditions (current density and initial dye concentration) while the initial pH value was kept at 9 to represent the real textile wastewater condition as used in this study. Dye removal, power consumption and electrode weight loss were found at 99.8%, 0.66 kWh/m3 and 0.039% for zinc electrode, 99.1%, 0.70 kWh/m3 and 0.066% for stainless steel electrode and 75.8%, 0.50 kWh/m3 and 0.41% for aluminum electrode, respectively. The treated real textile wastewater under the best operating conditions (current density and initial dye concentration) and at original pH of textile wastewater demonstrated that zinc electrode showed the highest dye removal (83.7%), lowest electrode weight loss (0.043%) and reasonable energy consumption (0.69 kWh/m3). The estimated operating cost of the EC process was lower for zinc electrode (MYR 3.9 per 1 m3 of treated textile wastewater for 10 minutes) compared with aluminum and stainless steel electrodes. Thus, zinc electrode could be an effective electrode material for treatment of textile wastewater containing reactive dye.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Full text is available at http://irplus.eng.usm.my:8080/ir_plus/institutionalPublicationPublicView.action?institutionalItemId=4621 |
| Subjects: | T Technology T Technology > TP Chemical Technology > TP200-248 Chemicals: Manufacture, use, etc. |
| Divisions: | Kampus Kejuruteraan (Engineering Campus) > Pusat Pengajian Kejuruteraan Kimia (School of Chemical Engineering) > Thesis |
| Depositing User: | Mr Mohd Jasnizam Mohd Salleh |
| Date Deposited: | 06 May 2019 08:09 |
| Last Modified: | 06 May 2019 08:09 |
| URI: | http://eprints.usm.my/id/eprint/44294 |
Actions (login required)
 |
View Item |
