Arum, Galuh Sekar (2018) Recovery Ion Ammonium dan Fosfat Dari Air Limbah PT Petrokimia Gresik dengan Proses Elektrodialisis. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Air limbah inlet Point L PT Petrokimia Gresik mengandung konsentrasi ion ammonium (NH4+) sebesar 3.395,4 mg/L dan fosfat (PO43-) sebesar 12.725 mg/L. Ion – ion tersebut memiliki potensi untuk dimanfaatkan kembali dengan pembentukan mineral struvite. Namun, air limbah tersebut juga memiliki konsentrasi ion fluor (F-) sebesar 1.157,5 mg/L sehingga dapat mengganggu proses pembentukan struvite. Proses elektrodialisis sebagai pra pengolahan air limbah tersebut dilakukan untuk mendapatkan konsentrasi ion ammonium dan fosfat sebanyak – banyaknya dan dengan konsentrasi ion pengotor yang rendah. Faktor dasar yang mempengaruhi proses elektrodialisis adalah nilai pH dan kuat arus listrik. Sehingga penelitian ini bertujuan untuk menentukan nilai arus listrik yang efektif dan menentukan nilai pH untuk mencegah potensi pembentukan kerak (scaling) pada permukaan membran.
Reaktor yang digunakan untuk penelitian ini adalah reaktor elektrodialisis yang terdiri dari 5 kompartemen. Anoda yang digunakan adalah perak sedangkan katoda yang digunakan adalah stainless steel. Sistem yang digunakan adalah batch dan dioperasikan selama 6 jam dengan 7 titik waktu pengambilan sampel. Elektroda dialiri arus listrik Direct Current (DC) dengan variasi kuat arus 0,05A; 0,1A; dan 0,15A. Air limbah yang diolah adalah air limbah inlet Point L PT Petrokimia Gresik dengan variasi pH awal 5, 7, dan 9. Parameter utama yang dianalisis meliputi pH, TDS, PO43-, NH4+, dan F-.
Proses elektrodialisis dengan kuat arus 0,1A menghasilkan produk dengan recovery massa ammonium dan fosfat sebesar 2.325 mg/L dan 8.610 mg/L. Selain itu, produk mengandung konsentrasi ion F- yang rendah sebesar 344 mg/L. Air limbah dengan pH 7 dapat mencegah pembentukan scaling pada permukaan membran karena diperkirakan membentuk massa TSS terendah sebesar 21,42 mg setelah 69 jam waktu operasi.
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Wastewater from PT Petrokimia Gresik inlet Point L contained 3,395.4 mg/L of ammonium ion and 12,725 mg/L of phosphate ion. Those ions were potential for being reused by forming struvite minerals. However, the wastewater also had 1,157.5 mg/L of fluor ion which can interfere the formation of struvite minerals. Electrodialysis as pre treatment was implemented to produce high recovery which contains high concentration of phosphate ion and ammonium ion but with low concentration of fluor ion. The basic factors that affect electrodialysis process are pH value and electric current. Therefore, the aim of this research is to determine the effective electric current and determine the pH value in order to prevent the possibility of scaling formation on membrane surface.
A laboratory-scale electrodialysis reactor was designed to create 5 compartments which used silver as anode and stainless steel as cathode. The system was performed in batch process during 6 hours operational time. Direct Current (DC) was applied on the electrodes with 3 variations of electric currect ; 0.5A, 0.1A, and 0.15A. The wastewater treated in this research was wastewater from PT Petrokimia Gresik inlet Point L with 3 variations of initial pH which were 5, 7, and 9. The main parameter analyzed were pH, TDS, PO43-, NH4+, dan F-.
As a result, electrodialysis process with 0.1A as electric current gave the best performance in recovery of ammonium and phosphate which were 2,325 mg/L and 8,610 mg/L respectively. Moreover, the product of this operation contained low concentration of F- ion as much as 344 mg/L. Wastewater at pH 7 was able to prevent the possible scaling formation due to its lowest TSS value formed as much as 21.42 mg after 69 hours of operation time.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSL 628.167 Aru r 3100018075971 |
| Uncontrolled Keywords: | ammonium, elektrodialisis, fosfat, fluor, membrane scaling, struvite, |
| Subjects: | T Technology > TD Environmental technology. Sanitary engineering > TD420 Water pollution T Technology > TD Environmental technology. Sanitary engineering > TD480.5 Electrodialysis |
| Divisions: | Faculty of Civil Engineering and Planning > Environment Engineering > 25201-(S1) Undergraduate Thesis |
| Depositing User: | Galuh Sekar Arum |
| Date Deposited: | 22 Jan 2019 03:48 |
| Last Modified: | 21 Oct 2020 06:42 |
| URI: | http://repository.its.ac.id/id/eprint/53541 |
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