Research article
Vol 14 No 1 (2020): Volume 14, Number 1, 2020
Kinetika pembentukan struvite kristal menggunakan zeolit alam sebagai adsorben pada aeration cone column crystallizer
Program Studi Magister Teknik Kimia, Program Pascasarjana, Universitas Muhammadiyah Palembang
Program Studi Magister Teknik Kimia, Program Pascasarjana, Universitas Muhammadiyah Palembang
1Program Studi Magister Teknik Kimia, Program Pascasarjana, Universitas Muhammadiyah Palembang
Program Studi Teknik Kimia, Fakultas Teknik, Universitas Muhammadiyah Palembang Jl. Ahmad Yani 13 Ulu Palembang
Abstract
Wastewater from the fertilizer industry contains a high concentration of PO43- and NH4+. Those ions formed deposits that frequently clogged the conduits and reduced the pump efficiency of the wastewater treatment plant. A high concentration of PO43- and NH4+ in this wastewater can be used as a secondary source of PO43- fertilizer through the recovery process into struvite compounds (MgNH4PO4.6H2O). In this research, Struvite was crystallized in Aeration Cone Column Crystallizer (ACCC) with Magnesium modified natural Zeolite (Zeo-Mg) as adsorbent. Research also has been done using the Batch process, and the results were used as basis variables in the ACCC system. Effects of Zeolite activation, amounts of Zeo-Mg (10 – 30 g), PO43- and NH4+reactant ratio (1:1 – 1:3), pH (6 – 9), and reaction time (0 – 60 minutes) to the removal percentage of PO43- were used as research parameters that analyzed in struvite crystallization process. Zeo-Mg and struvite produced were analyzed using scanning electron microscopy and energy dispersive X-ray spectroscopy. Research results in the ACCC system with Zeo-Mg as adsorbent showed that the percentage of PO43- removal was 65% in 16 minutes and followed pseudo-first-order reaction kinetics with a reaction rate constant of 0.21 min-1. The PO43- removal reached equilibrium at pH 8.10 after 28 minutes. Simultaneous removal of PO43- to formed struvite crystals using Zeo-Mg as an adsorbent and without the addition of Mg ions solution in the ACCC system is a novel process in wastewater treatment. Moreover, this PO43- recovery process can be implemented in the industrial scale due to the practical operation.
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