Sejak kebelakangan ini, penyingkiran bahan pencemar daripada efluen melalui proses penggumpalan elektrik telah menjadi satu kaedah alternatif. Dalam kajian ini, kaedah penggumpalan elektrik menggunakan Aluminium sebagai elektrod telah digunakan. Kajian ini dijalankan dalam skala makmal. Sampel air sisa dimasukkan ke dalam reaktor elektrokimia yang mengandungi aluminum elektrod. Kemudian, aluminum elektrod disambungkan ke satu bekalan kuasa arus terus bagi mengkaji kesan parameter-parameter yang terlibat seperti masa elektrolisis (3-15 min) dan ketumpatan arus (30-60 Am-2) telah digunakan untuk mendapatkan keadaan yang optimum bagi kecekapan penyingkiran warna dalam proses Elektrokogulasi. Keadaan optimum bagi proses penggumpalan elektrik ini telah didapati pada keadaan masa elektrosis pada 6 min dan ketumpatan arus pada 40 Am-2. Di dalam proses penggumpalan elektrik ini juga, kesan kepekatan pewarna awal dan kepekatan elektrolit terhadap kecekapan penyingkiran warna di bawah keadaan optimum telah disiasat. Peningkatan kepekatan pewarna awal telah menunjukkan bahawa kecekapan penyingkiran warna dalam proses penggumpalan elektrik menurun. Selain itu, penambahan elektrolit NaCl dalam sisa air telah meningkatkan kecekapan penyingkiran warna dalam proses penggumpalan elektrik. Peningkatan kepekatan elektrolit NaCl telah menunjukkan kecekapan penyingkiran warna meningkat. Ia telah mendapati bahawa proses penggumpalan elektrik di bawah keadaan optimum boleh mencapai penyingkiran warna sehingga 98% dengan kehadiran NaCl elektrolit manakala 83% penyingkiran warna tanpa NaCl elektrolit. Kajian ini menunjukkan bahawa proses penggumpalan elektrik adalah satu kaedah yang cekap dan berkesan dalam merawat air sisa perwarna congo.
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The removal of pollutant from effluent by Electrocoagulation process has become an alternative method in recent years. This study deals with the batch removal of Congo red from aqueous solution by electrocoagulation method using Aluminium electrodes. This study was conducted in laboratory scale. The sample was placed into the electrochemical reactor contains 10 electrodes. The electrodes were connected to a DC power supply. Then, the effect of the operational parameters, electrolysis time (3-15min) and current density (30-60 Am-2) were applied to determine the optimum conditions for color removal efficiency. The optimum electrolysis time and current density were found to be 6 min and 40 Am-2, respectively. Also, the effects of initial dye concentration and electrolyte concentration on the decolorization removal efficiency under optimum condition have been investigated. The increase in initial concentration showed that the color removal efficiency was decreased. Furthermore, the result in this study showed that the NaCl electrolyte was enhanced the efficiency of color removal. The increase of NaCl electrolyte concentration the color removal was increased. It was found that Electrocoagulation process under optimum conditions was able to attain color removal up to 98% in the presence of NaCl electrolyte while 83% color removal in the absence of NaCl electrolyte. This study showed that electrocoagulation process is an effective and efficient method to treat Congo dye wastewater.
Electrocoagulation process for decolorization of congo red dye in wastewater / Md Rafee Bachok