Pengaruh Waktu Proses pada Desalinasi Air Laut dengan Metode Elektrokoagulasi secara Batch

Abstract

ABSTRAK
 Salah satu upaya untuk menjaga persediaan air yaitu dengan cara menurunkan parameter air laut agar memenuhi parameter air tawar menggunakan metode elektrokoagulasi. Penelitian ini bertujuan untuk mempelajari pengaruh waktu proses elektrokoagulasi terhadap penurunan TDS, kekeruhan, kadar Cl, dan kadar Fe. Selain itu, untuk mengetahui perbandingan antara elektroda Al dan Fe. Air laut diambil dari Pantai Pelabuhan Ratu. Elektroda yang digunakan adalah Al dan Fe dengan ukuran 15x10 cm2. Tegangan yang digunakan yaitu 5 volt atau rapat arus sebesar 0,137 A/dm2 dengan waktu proses 15, 30, 45, dan 60 menit serta volume bahan bakunya 4 Liter. Penelitian dengan waktu proses 30 menit dan proses pengendapan selama satu hari mampu menurunkan kekeruhan hingga 2,28 NTU (55,07%); TDS hingga 1.010 mg/L (3,71%); kadar Cl hingga 271,98 mg/L (3,52%); dan kadar Fe 0,05 mg/L (40,65%). Proses elektrokoagulasi menggunakan elektroda aluminium lebih baik dibandingkan elektroda besi pada waktu proses 30 menit.
 
 ABSTRACT
 One of the efforts to maintain water supply is by lowering seawater parameters to meet freshwater parameters using the electrocoagulation method. This study aims to study the effect of electrocoagulation process time on the decrease in TDS, turbidity, Cl content, and Fe content. In addition, to determine the comparison between Al and Fe electrodes. Seawater is taken from Pelabuhan Ratu Beach. The electrodes used are Al and Fe with a size of 15x10 cm2. The voltage used is 5 volts or a current density of 0,137 A/dm2 with processing times of 15, 30, 45, and 60 minutes and the volume of the raw material is 4 liters. Research with a processing time of 30 minutes and sedimentation for one day was able to reduce turbidity up to 2,28 NTU (55,07%); TDS up to 1.010 mg/L (3,71%); Cl content up to 271,98 mg/L (3,52%); and Fe content of 0,05 mg/L (40,65%). The electrocoagulation process using aluminum electrodes was better than iron electrodes at a processing time of 30 minutes.

Neutralization of Acidity (pH) and Reduction of Total Suspended Solids (TSS) by Solar-Powered Electrocoagulation System

“…The ideal contact time to improve the quality of wastewater is between 15 and 30 minutes, which can increase the pH value, while the optimum contact time for the electrocoagulation process is within the initial 15 minutes [60]. Meanwhile, the optimum contact time for the electrocoagulation process to improve the quality of wastewater is 30 minutes, which can increase the pH value [60,61]. On the other hand, 45 minutes is sufficient to form flocculants via Al(OH)3 as a coagulant, which can affect the pH value of the wastewater [62].…”

Treatment of Dug Well Water in Kubu Raya, West Kalimantan, with Electrocoagulation

“…The elimination of Fe proceeds concurrently with the reduction of Fe cations at the cathode. This Fe cation reduction reaction takes place because the standard electrode potential is larger than that of water, enabling it to decrease the Fe cation [18]. The following is the Mn removal mechanism that occurs during electrocoagulation [27].…”

“…These OHions will react with Al 3+ ions from PAC ionization to release Al(OH)3 which behaves as a coagulant to adhere contaminants of acidic organic substances. Therefore, the longer the electrocoagulation occurs, the more OHions will accumulate in the dug well water causing the initially acidic pH to become alkaline [14,15].…”

“…Moreover, the TDS value of water intensely rises because impurity minerals in dug well water dissolve during the electrocoagulation process, and the generated coagulant cannot retain these minerals. This may be due to the low voltage employed, which reduces the electric current in each electrode area while increasing the resistance [18].…”

“…According to Ref. [18], this is due to the plate passivity process. The plate remains saturated with the floc bound to the electrode over the 75minute operation, inhibiting the anode or cathode reaction process.…”