Proses elektro-penggumpalan (EC) adalah proses elektrik termasuk nyahstabil campuran pepejal, emulsi atau mencairkan bahan pencemar dalam larutan akues dengan menggunakan arus elektrik. Dalam kajian ini, sumber zink dan besi terbuang telah digunakan sebagai elektrod untuk mengurangkan kos pembelian elektrod komersial sejak rawatan ini menggunakan tenaga elektrik untuk bekalkan elektrik yang membawa kepada kos operasi yang tinggi. Saiz sel elektrolisis ialah 1.1L yang memuatkan sepasang elektrod mewakili anod dan katod. Parameter yang terlibat dalam kajian ini ialah ketumpatan arus (5-30 mA/cm2), kepekatan awal (25-100 ppm) dan masa elektrolisis (10-50 min). Prestasi pengingkiran dibandingkan dengan peratusan pengingkiran warna dan jumlah enapcemar kering yang terhasil selepas proses rawatan. Manakala, ketumpatan arus yang optimum ialah 25 mA/cm2 memberi kecekapan penyingkiran pewarna 95.73% untuk zink dan 92.93% untuk besi pada masa 30 minit proses rawatan. Bagi kedua-dua elektrod, telah didapati bahawa kecekapan penyingkiran akan berkurang apabila kepekatan awal bertambah. Bagi masa tindak balas, tempoh yang optimum untuk proses rawatan bagi kedua-dua zink dan besi elektrod ialah 30 minit dengan kecekapan 95.73% dan 92.93%. Prestasi zink elektrod dalam pengingkiran warna didapati lebih baik berbanding besi elektrod oleh kerana air yang dirawat dihasilkan adalah jelas dan tidak berbau sebaliknya besi elektrod menghasilkan warna kekuningan dan kehijauan di mana mengganggu kualiti air.
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The electrocoagulation (EC) is an electrical process include destabilizing suspending solids, emulsion or solved pollutants in aqueous solutions by using electrical currents. In this study, zinc and iron based of metal wastes are used as electrode to reduce purchasing cost of commercial electrode since this treatment consumed electrical energy to supply electricity leads to high operating cost. The size of electrolysis cell was 1.1L which fitted with a pair of electrodes represent anode and cathode. The parameter involved in this study are current density (5-30 mA/cm2), initial concentration (25-100 ppm) and electrolysis time (10-50 min). The performance of removal is compared by percentage of colour removal and amount of dried sludge produced after the treatment process. Meanwhile, the optimum current density is 25 mA/cm2 gives efficiency of dye removal 95.73% for zinc and 92.93% for iron at 30 minutes of treatment process. For both electrodes, it was found that the removal efficiencies will be reduced as the initial concentration increased. For reaction time, the optimum duration of treatment process for both zinc and iron electrodes is 30 minutes with efficiencies 95.73% and 92.93% respectively. The performance of zinc electrode in colour removal was found to be better than iron electrode owing to its treated water produced was clear and odourless instead of iron produced yellowish and greenish which interrupted the water quality.
Treatment of dye wastewater through electrocoagulation process using low cost electrode / Nurul Syafinaz Ahmazi